{"gene":"PF3D7_1423600","run_date":"2026-09-08T14:19:07","timeline":{"discoveries":[{"year":1993,"finding":"PfCDPK1 (PfCPK) was identified as a calcium-dependent protein kinase with an N-terminal kinase domain and C-terminal EF-hand calcium-binding domain (four EF-hand motifs). Recombinant protein expressed in E. coli exhibited Ca2+-dependent protein kinase activity, establishing it as a plant-like CDPK.","method":"Molecular cloning, sequence analysis, recombinant expression in E. coli, in vitro kinase assay","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — in vitro enzymatic reconstitution demonstrating Ca2+-dependent kinase activity, replicated by subsequent studies","pmids":["8440720"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":1994,"finding":"PfCDPK1 has four EF-hand calcium-binding sites in its C-terminal domain. EF-hand sites I and II are crucial for both Ca2+-induced conformational change and enzymatic activation; site II mutations almost completely abolish kinase activity, site I mutations dramatically reduce Ca2+-sensitivity and activation. Sites III and IV have minor effects. The kinase is activated by Ca2+ (K0.5 = 15 µM) and undergoes autophosphorylation on serine and threonine residues. It preferentially phosphorylates casein and histone H1 in vitro.","method":"Site-directed mutagenesis of EF-hand motifs (Glu→Lys or Glu→Gln), circular dichroism, in vitro kinase assay, 45Ca2+ binding, autophosphorylation assay","journal":"Biochemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — mutagenesis of individual Ca2+-binding sites combined with biochemical assays; replicated across two papers (PMID:8142371, PMID:7808482)","pmids":["8142371","7808482"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":1994,"finding":"Purified recombinant PfCDPK1 preferentially phosphorylates proteins of the host erythrocytic membrane in vitro but phosphorylates parasitic proteins only to a minor extent. Calmodulin antagonists (calmidazolium, trifluoperazine, W-7, ophiobolin A) inhibit kinase activation at higher concentrations than needed to inhibit calmodulin-mediated effects. The kinase is mainly expressed in ring and schizont stages and localizes predominantly to the parasitic membrane-organelle fraction and partially to the erythrocytic membrane.","method":"In vitro kinase assay with erythrocytic membrane proteins, calmodulin antagonist inhibition assay, immunoblotting with polyclonal antiserum, subcellular fractionation","journal":"Molecular and biochemical parasitology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct in vitro substrate phosphorylation and fractionation-based localization, single lab, multiple methods","pmids":["7808482"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2004,"finding":"PfCDPK1 contains three N-terminal membrane-anchoring motifs: a myristoylation consensus sequence, a putative palmitoylation site, and a basic motif. The kinase is myristoylated both in vivo (endogenous) and in vitro. Dual acylation (myristoylation + palmitoylation) together with the basic cluster are required for correct targeting of PfCDPK1 to the parasitophorous vacuole and the tubovesicular system, as shown by immunogold electron microscopy and GFP mutagenesis experiments.","method":"Immunogold electron microscopy, GFP fusion mutagenesis (acylation site mutants), in vitro myristoylation assay, subcellular targeting experiments","journal":"Molecular microbiology","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — direct mutagenesis of acylation motifs combined with immunogold EM and GFP localization establishing targeting mechanism","pmids":["15491359"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2004,"finding":"The calmodulin-like domain (CaM-LD) of a Plasmodium CDPK (studied using spectroscopic/biophysical methods applicable to PfCDPK1 regulatory domain) is composed of two lobes with differing Ca2+ affinities: the C-lobe has two cooperatively interacting high-affinity sites (Kd ~5.6 nM) and the N-lobe has two weaker sites (Kd ~110 nM). The junction (J) region has an essential role in stabilizing the CaM-LD structure and dramatically increases Ca2+ affinity. A model is supported whereby the C-lobe interacts with the junction even at basal Ca2+ but kinase remains autoinhibited until the N-lobe weaker sites are filled.","method":"NMR spectroscopy, Ca2+ titration/binding measurements, circular dichroism, domain-construct analysis of isolated J-CaM-LD","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 1 / Weak — rigorous biophysical characterization of isolated regulatory domain construct but single lab; mechanistic model proposed but not fully validated in intact kinase","pmids":["15126505"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2008,"finding":"PfCDPK1 phosphorylates two components of the parasite motor complex (glideosome): myosin A tail domain-interacting protein (MTIP) at serine 47, and glideosome-associated protein 45 (GAP45) at two sites (one confirmed in parasite phosphopeptides). PfCDPK1 localizes to the periphery of P. falciparum merozoites by indirect immunofluorescence, consistent with its acting on MTIP and GAP45 at the inner membrane complex. Both PfCDPK1 activity and host cell invasion are inhibited by the kinase inhibitor K252a.","method":"In vitro kinase assay, indirect immunofluorescence, mass spectrometry-based phosphopeptide identification from parasite lysates, kinase inhibitor treatment","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — in vitro phosphorylation of substrates confirmed with MS, site-specific identification, localization, and inhibitor phenotype; replicated by subsequent studies","pmids":["18768477"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2008,"finding":"PfCDPK1 is coexpressed with genes encoding the parasite motor complex. A targeted gene-disruption approach showed that pfcdpk1 appears essential for parasite viability in the erythrocytic stage, and treatment with 2,6,9-trisubstituted purine inhibitors of PfCDPK1 caused sudden developmental arrest at the late schizont stage in P. falciparum, suggesting a role in motility regulation during egress/invasion.","method":"Targeted gene disruption attempt, gene expression profiling, in vitro biochemical screen, compound treatment phenotypic assay","journal":"Nature chemical biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — gene disruption combined with chemical inhibition phenotype; essentiality in asexual stage, single lab","pmids":["18454143"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2009,"finding":"PfCDPK1 phosphorylates PfGAP45 at nine sites in vitro (Ser31, Ser89, Ser103, Ser109, Ser121, Ser149, Ser156, Thr158, Ser173) as identified by mass spectrometry after multi-protease digestion. Phosphorylation at adjacent sites Ser156 and Thr158 is mutually exclusive, and phosphorylation at these sites interferes specifically with proteolytic cleavage by chymotrypsin or trypsin respectively, demonstrating that phosphorylation alters the kinase substrate and protease substrate properties of GAP45.","method":"In vitro kinase assay (PfCDPK1 + PfGAP45), multi-protease digestion, Ga(III)-IMAC phosphopeptide enrichment, nano-UPLC-ESI-MS/MS","journal":"Analytical biochemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — rigorous in vitro phosphorylation with multiple proteases and MS identification of phosphosites; single lab but multiple orthogonal methods","pmids":["19549500"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2012,"finding":"In P. berghei, CDPK1 is expressed in all life stages and is indispensable during sexual mosquito stages. Knockdown of CDPK1 in sexual stages arrested zygote development and prevented mosquito transmission. Translational and transcriptional profiling of arrested parasites revealed that CDPK1 translationally activates mRNA species in the developing zygote that remain repressed (via 3' and 5' UTRs) in macrogametes, establishing a role for CDPK1 in translational activation of repressed mRNAs.","method":"Conditional knockdown, translational profiling (polysome analysis), transcriptional profiling, mosquito transmission assays","journal":"Cell host & microbe","confidence":"High","confidence_rationale":"Tier 2 / Strong — conditional knockdown with in-depth translational and transcriptional profiling revealing molecular mechanism; multiple orthogonal methods","pmids":["22817984"],"is_preprint":false,"attribution":[{"species":"Plasmodium berghei","strain":""}]},{"year":2012,"finding":"PfCDPK1 phosphorylates GAP45 in P. falciparum schizonts at specific serine residues. GAP45 is assembled early into the motor complex and transported to the developing inner membrane complex. Replacing phosphorylated serines with alanine or aspartate has no apparent effect on GAP45 assembly into the motor protein complex or its subcellular location, indicating phosphorylation by PfCDPK1 at these sites is not required for GAP45 assembly.","method":"GFP-tagging of GAP45 (internal), site-directed mutagenesis of phosphoserine residues, immunofluorescence, co-immunoprecipitation, in vitro phosphorylation","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — mutagenesis and GFP imaging with negative finding on assembly; single lab, multiple methods","pmids":["22479457"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2012,"finding":"PfCDPK1 directly regulates the junction (J) domain: binding of the calmodulin-like domain (CaM-LD) to the P3 region (Leu356–Thr370) of the J domain occurs in a Ca2+-dependent manner. Site-directed mutagenesis of conserved hydrophobic residues in the J domain (F363A/I364A, L356A, F350A) abrogates PfCDPK1 functional activity. A P3 peptide specifically inhibits PfCDPK1 activity and blocks microneme discharge and erythrocyte invasion by P. falciparum merozoites. The PfCDPK1 inhibitor purfalcamine also blocks microneme discharge and erythrocyte invasion.","method":"In vitro binding assay (CaM-LD + J domain peptides), site-directed mutagenesis, in vitro kinase assay, microneme secretion assay, erythrocyte invasion assay, peptide inhibitor treatment","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — mutagenesis combined with binding assays, enzymatic activity, and functional invasion/secretion assays; multiple orthogonal methods","pmids":["23204525"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2012,"finding":"PfCDPK1 autophosphorylates at multiple sites as detected by mass spectrometry, and some of these autophosphorylation sites are at strategic locations critical for kinase activation. The N-terminal extension (NTE) of PfCDPK1 is important for its activation, and unexpectedly an ATP-binding site was identified within the NTE.","method":"Mass spectrometry (autophosphorylation site identification), molecular modeling, site-directed mutagenesis, in vitro kinase assay","journal":"FASEB journal","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — MS identification of autophosphorylation sites with mutagenesis validation; single lab","pmids":["22539638"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2012,"finding":"PfGAP45 is phosphorylated by PfCDPK1 at S89, S103, and S149 in response to phospholipase C and calcium signaling. PfPKB also phosphorylates GAP45 at the same sites. The phospholipase C pathway influences phosphorylation at S103 and S149. Phosphorylation of GAP45 at these sites is differentially regulated during parasite development but does not affect GAP45 localization or its association with the glideosome complex.","method":"In vitro kinase assay, phosphosite-specific mutagenesis, co-immunoprecipitation, immunofluorescence, PLC pathway inhibition","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vitro phosphorylation combined with pathway manipulation and mutagenesis; single lab","pmids":["22558243"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2013,"finding":"P. berghei CDPK1 is dispensable for erythrocytic stage invasion and intra-erythrocytic development, as well as for sporozoite invasion of hepatocytes, egress from hepatocytes, and the subsequent erythrocytic cycle. Targeted gene disruption of PbCDPK1 yielded viable erythrocytic-stage parasites; a conditional mutant confirmed CDPK1 is dispensable in pre-erythrocytic stages. PbCDPK1 plays an essential role only in mosquito sexual stages.","method":"Targeted gene disruption by homologous recombination, conditional knockdown, phenotypic assays (invasion, development, transmission)","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — clean KO with multiple stage-specific phenotypic readouts; single lab; species-specific finding in P. berghei that contrasts with P. falciparum data","pmids":["24265753"],"is_preprint":false,"attribution":[{"species":"Plasmodium berghei","strain":""}]},{"year":2014,"finding":"PfCDPK1 expressed in Toxoplasma gondii TgCDPK3-null parasites rescues the egress defect, and this rescue requires both plasma membrane localization of PfCDPK1 and its kinase activity. PfCDPK1-expressing T. gondii shows increased sensitivity to purfalcamine (a PfCDPK1-specific inhibitor). Six of eight tested PfCDPK1 inhibitors selectively inhibited ionophore-induced egress in PfCDPK1-expressing strains, and gatekeeper residue determines selectivity of dasatinib and PLX-4720.","method":"Heterologous complementation in T. gondii, mutagenesis of gatekeeper residue and membrane-targeting motif, egress assay, drug sensitivity assay","journal":"Antimicrobial agents and chemotherapy","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional complementation with mechanistic mutagenesis; single lab","pmids":["24550330"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2015,"finding":"PfCDPK1 is phosphorylated by PfPKG, as identified by quantitative global phosphoproteomics using chemical and genetic tools to inhibit PfPKG. This places PfCDPK1 downstream of PfPKG in the cGMP signaling cascade regulating parasite egress and invasion.","method":"Quantitative global phosphoproteomics, chemical inhibition of PfPKG, genetic tools (PfPKG-null parasites)","journal":"Nature communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — quantitative phosphoproteomics identifying PfCDPK1 as a PfPKG target; single lab, indirect evidence of direct phosphorylation","pmids":["26149123"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2016,"finding":"PfCDPK1 is critical for erythrocyte invasion by P. falciparum merozoites, established by conditional knockdown. Comparative phosphoproteomics identified substrates of PfCDPK1 including proteins of the Inner Membrane Complex and glideosome-actomyosin motor assembly. PfCDPK1 phosphorylates PfPKA regulatory subunit (PfPKA-R) and regulates PfPKA activity, indicating cross-talk between Ca2+/CDPK1 and cAMP/PKA signaling pathways relevant to invasion.","method":"Conditional knockdown, comparative phosphoproteomics, in vitro kinase assay, PKA activity assay","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — conditional KD with quantitative phosphoproteomics and in vitro validation of substrates; multiple orthogonal methods","pmids":["28680058"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2016,"finding":"Introduction of a methionine gatekeeper substitution (T145M) in PfCDPK1 by CRISPR/Cas9 reduced transphosphorylation activity by 47%. In mutant parasites, reduced CDPK1 activity is compensated through the action of PKG (or a kinase under PKG regulation), as T145M parasites showed increased sensitivity to the PKG inhibitor compound 2. Transcript levels of CDPK5 and CDPK6 were significantly upregulated in T145M parasites, suggesting compensatory kinase upregulation.","method":"CRISPR/Cas9 genome editing, in vitro kinase assay, compound sensitivity assay (BKI-1294, compound 2), qRT-PCR","journal":"mBio","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — CRISPR-edited parasites with chemical genetic validation; single lab","pmids":["27923926"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2018,"finding":"PfCDPK1 physically interacts with and phosphorylates PfSERA5 (serine repeat antigen 5) in vitro in a Ca2+-dependent manner, enhancing its proteolytic activity. This interaction was confirmed by co-sedimentation, co-immunoprecipitation, and co-immunolocalization. A PfCDPK1 inhibitor (purfalcamine) blocked phosphorylation and activation of PfSERA5 in vitro and in schizonts, blocking merozoite egress, identifying PfSERA5 as a functional substrate of PfCDPK1 in the egress pathway.","method":"Immunoprecipitation + MS (identification of interaction), co-sedimentation, co-immunoprecipitation, co-immunolocalization, in vitro kinase assay, purfalcamine inhibitor treatment, egress assay","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal co-IP confirmed with co-sedimentation and co-localization, in vitro phosphorylation, and functional egress assay with inhibitor; multiple orthogonal methods","pmids":["29716996"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2006,"finding":"The Plasmodium falciparum Raf kinase inhibitory protein ortholog (PfPE-PB1/PfRKIP) is phosphorylated by PfCDPK1 in vitro (though with ~7-fold lower specific activity than casein). The presence of PfRKIP in kinase assays greatly enhanced PfCDPK1 autophosphorylation (~5.5-fold) while diminishing substrate (casein) phosphorylation activity, suggesting PfRKIP acts as a regulator of PfCDPK1.","method":"Recombinant protein expression, in vitro kinase assay, autophosphorylation assay","journal":"Molecular and biochemical parasitology","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single in vitro kinase assay, single lab, no in vivo validation of the regulatory interaction","pmids":["17123645"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2020,"finding":"Pf14-3-3I binds phosphorylated PfCDPK1 (via phosphorylation at the canonical Mode I-type motif 61KLGpS64) to mediate assembly of a multiprotein signaling complex in P. falciparum merozoites. This interaction was validated by co-immunoprecipitation, gel filtration chromatography, ELISA, surface plasmon resonance (binding affinity ~670 nM), and molecular dynamics simulation. The 14-3-3I/CDPK1 interaction is phosphorylation-dependent and marginally enhances CDPK1 functional activity. Disruption of the multiprotein complex (using a phospho-peptide derived from PKAr) inhibits microneme secretion and RBC invasion.","method":"Co-immunoprecipitation, gel filtration chromatography, quantitative phosphoproteomics, ELISA, surface plasmon resonance (SPR), isothermal titration calorimetry (ITC), molecular dynamics simulation, in vitro kinase assay, invasion/secretion assays","journal":"mBio / The Biochemical journal","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal interaction validated by multiple orthogonal biophysical and biochemical methods across two independent papers","pmids":["32817103","32484216"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":"3D7"}]},{"year":2020,"finding":"PfCDPK1 undergoes dynamic palmitoylation and localizes to the merozoite membrane in a palmitoylation-dependent manner, as demonstrated by acyl biotin exchange chemistry (ABE) and confocal imaging. Exposure of merozoites to low [K+] activates palmitoyl acyl transferase (PAT) activity, and PAT inhibition by 2-bromopalmitate blocks microneme secretion and RBC invasion, implicating dynamic palmitoylation of PfCDPK1 in regulation of its membrane association and function.","method":"Acyl biotin exchange (ABE) chemistry, copper-catalyzed alkyne-azide cycloaddition (CuAAC) imaging, confocal microscopy, PAT inhibitor treatment (2-bromopalmitate), microneme secretion and invasion assays","journal":"ACS infectious diseases","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ABE and imaging demonstrate dynamic palmitoylation of PfCDPK1; functional link via PAT inhibitor; single lab","pmids":["32003970"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2022,"finding":"In the absence of the CAD (calmodulin-like activation domain), the salt bridge between Glu116 (αC-helix) and Lys85 (β3-sheet) of the PfCDPK1 kinase domain breaks after 200 ns of MD simulation, resulting in an inactive kinase conformation. In the complete protein (with CAD), the salt bridge remains intact, revealing that the CAD domain allosterically stabilizes the active conformation of the kinase domain. This represents a novel CAD-mediated allosteric activation mechanism.","method":"Microsecond-scale molecular dynamics (MD) simulation of modeled PfCDPK1 structures (complete protein vs. kinase domain alone), in silico screening","journal":"International journal of biological macromolecules","confidence":"Low","confidence_rationale":"Tier 4 / Weak — computational MD simulation only, no experimental biochemical or structural validation of the allosteric mechanism","pmids":["35709874"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2024,"finding":"PP7 (a Ca2+-dependent phosphatase) physically interacts with PfCDPK1, as identified by co-immunoprecipitation/interaction studies, consistent with a role for both proteins in calcium signaling pathways during blood-stage development.","method":"Co-immunoprecipitation (interaction identified in the context of PP7 function studies)","journal":"mBio","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single co-IP interaction reported as part of a study focused on PP7, not PfCDPK1; no functional characterization of the PfCDPK1 side of the interaction","pmids":["39387582"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2023,"finding":"In P. berghei, SCFFBXO1-dependent ubiquitination and CDPK1-dependent phosphorylation show functional interplay: ubiquitinomic surveys identified FBXO1-dependent ubiquitination of proteins important for egress and IMC organization that overlap with CDPK1-regulated processes, and the study demonstrates an interplay between FBXO1-dependent ubiquitination and phosphorylation via CDPK1.","method":"Ubiquitinomic profiling (mass spectrometry), genetic deletion of FBXO1, phenotypic assays","journal":"Nature communications","confidence":"Low","confidence_rationale":"Tier 3 / Weak — CDPK1 interplay mentioned as part of a study focused on SCFFBXO1; the specific mechanistic relationship between FBXO1 and CDPK1 is not directly demonstrated for PF3D7_1423600","pmids":["36898988"],"is_preprint":false,"attribution":[{"species":"Plasmodium berghei","strain":""}]}],"current_model":"PfCDPK1 (PF3D7_1423600) is a plant-like calcium-dependent protein kinase that is activated by Ca2+ binding to its C-terminal calmodulin-like domain (EF-hands I and II being critical for activation), is dually acylated (myristoylated and palmitoylated) for membrane targeting to the inner membrane complex/parasitophorous vacuole, and phosphorylates key glideosome components (GAP45, MTIP) as well as PfSERA5, PfPKA-R, and PfRKIP to regulate microneme secretion, erythrocyte invasion, and merozoite egress; it is positioned downstream of PfPKG in the cGMP/Ca2+ signaling cascade, assembles into a 14-3-3I-mediated multiprotein signaling complex in a phosphorylation-dependent manner, and is essential for mosquito-stage sexual development where it translationally activates repressed zygote mRNAs."},"narrative":{"mechanistic_narrative":"PfCDPK1 (PF3D7_1423600) is a plant-like calcium-dependent protein kinase that couples Ca2+ signaling to the invasion and egress machinery of the malaria parasite, comprising an N-terminal kinase domain and a C-terminal calmodulin-like regulatory domain bearing four EF-hand motifs [PMID:8440720]. Ca2+ binding (K0.5 ~15 µM) activates the enzyme, with EF-hand sites I and II being critical for the conformational change and catalytic activation while sites III and IV contribute minimally [PMID:8142371, PMID:7808482]; activation additionally depends on the N-terminal extension and on autophosphorylation at sites positioned for kinase activation [PMID:22539638], and on Ca2+-dependent engagement of the junction (J) domain P3 region by the calmodulin-like domain, since P3 peptides or J-domain hydrophobic mutations abrogate activity, block microneme discharge, and block erythrocyte invasion [PMID:23204525]. The kinase is targeted to parasite membranes—including the parasitophorous vacuole, tubovesicular system, and merozoite periphery/inner membrane complex—through dual acylation (myristoylation plus palmitoylation) and a basic cluster, with dynamic palmitoylation regulating membrane association during invasion [PMID:15491359, PMID:18768477, PMID:32003970]. Functionally, PfCDPK1 phosphorylates glideosome/motor components MTIP and GAP45 [PMID:18768477, PMID:19549500], the egress protease PfSERA5 (which it also binds and activates) [PMID:29716996], and the PKA regulatory subunit PfPKA-R, thereby linking Ca2+/CDPK1 to cAMP/PKA signaling [PMID:28680058]; it sits downstream of PfPKG in the cGMP cascade [PMID:26149123] and assembles into a phosphorylation-dependent Pf14-3-3I-scaffolded multiprotein signaling complex whose disruption blocks microneme secretion and invasion [PMID:32817103, PMID:32484216]. In asexual blood stages of P. falciparum the kinase is essential/critical for merozoite egress and erythrocyte invasion [PMID:18454143, PMID:28680058], whereas in P. berghei CDPK1 is dispensable for erythrocytic and pre-erythrocytic development and is instead essential in the mosquito sexual stages, where it translationally activates repressed zygote mRNAs [PMID:22817984, PMID:24265753].","teleology":[{"year":1993,"claim":"Establishing what class of enzyme this gene encodes was the first requirement; cloning and reconstitution showed it is a plant-like CDPK with an intramolecular Ca2+ sensor rather than a canonical kinase requiring separate calmodulin.","evidence":"Molecular cloning, recombinant expression in E. coli, and in vitro Ca2+-dependent kinase assay","pmids":["8440720"],"confidence":"High","gaps":["Physiological substrates not identified","In vivo localization and stage expression not yet defined"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":1994,"claim":"How Ca2+ actually activates the kinase was resolved by dissecting the four EF-hands, showing that sites I and II drive the activating conformational change while III and IV are minor—defining the regulatory logic of the sensor domain.","evidence":"Site-directed mutagenesis of EF-hand motifs with circular dichroism, 45Ca2+ binding, autophosphorylation, and in vitro kinase assays; substrate preference for casein and histone H1","pmids":["8142371","7808482"],"confidence":"High","gaps":["Casein/histone are generic in vitro substrates, not physiological targets","Mechanism linking Ca2+ binding to catalytic activation not resolved at structural level"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":1994,"claim":"Whether the kinase acts on host or parasite proteins and where it resides was addressed by fractionation and in vitro substrate profiling, pointing to membrane-organelle localization and possible host erythrocyte membrane targets.","evidence":"In vitro kinase assay with erythrocyte membrane proteins, calmodulin antagonist inhibition, immunoblotting, and subcellular fractionation","pmids":["7808482"],"confidence":"Medium","gaps":["Host membrane phosphorylation not confirmed in vivo","Fractionation localization lacks organelle-level resolution"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2004,"claim":"How a soluble kinase reaches its site of action was answered by identifying dual acylation plus a basic motif as the membrane-targeting determinant directing PfCDPK1 to the parasitophorous vacuole and tubovesicular system.","evidence":"Immunogold EM, GFP acylation-mutant localization, and in vitro myristoylation assay","pmids":["15491359"],"confidence":"High","gaps":["Palmitoyl transferase responsible not identified here","Functional consequence of mistargeting on kinase activity not tested"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2004,"claim":"The biophysical basis of Ca2+ sensitivity was quantified by showing the regulatory domain has a high-affinity C-lobe and weaker N-lobe, with the junction region tuning affinity, refining the model of autoinhibition release.","evidence":"NMR, Ca2+ titration, and CD on isolated J-CaM-LD constructs","pmids":["15126505"],"confidence":"Medium","gaps":["Model built on isolated domain, not intact kinase","Single-lab biophysical study"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2008,"claim":"The physiological substrate question was answered by identifying glideosome motor components MTIP and GAP45 as targets, connecting the kinase to the invasion motor, alongside genetic and chemical evidence for essentiality.","evidence":"In vitro kinase assays with MS phosphosite mapping, immunofluorescence, K252a/purine inhibitor treatment, and targeted disruption attempt","pmids":["18768477","18454143"],"confidence":"High","gaps":["Functional consequence of MTIP/GAP45 phosphorylation on motor activity not defined","Gene-disruption essentiality inferred from failed knockout"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2009,"claim":"The extent and consequence of GAP45 phosphorylation was mapped, revealing nine sites and demonstrating that phosphorylation alters GAP45's protease-accessibility, hinting at a structural regulatory effect.","evidence":"In vitro kinase assay, multi-protease digestion, IMAC enrichment, and nano-UPLC-MS/MS","pmids":["19549500"],"confidence":"High","gaps":["In vivo occupancy of these nine sites unknown","Biological readout of altered protease sensitivity untested"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2012,"claim":"Species-divergent roles emerged: in P. berghei CDPK1 is dispensable in blood/pre-erythrocytic stages but essential in mosquito sexual stages, where it was shown to translationally activate mRNAs repressed in the macrogamete.","evidence":"Conditional knockdown with polysome/translational and transcriptional profiling and mosquito transmission assays in P. berghei","pmids":["22817984","24265753"],"confidence":"High","gaps":["Molecular mechanism of translational activation (direct targets) not defined","Whether P. falciparum CDPK1 shares this sexual-stage function untested"],"attribution":[{"species":"Plasmodium berghei","strain":""}]},{"year":2012,"claim":"Whether GAP45 phosphorylation controls motor assembly was tested and answered negatively—phosphosite mutants assembled and localized normally—refocusing GAP45 phosphorylation's role away from assembly.","evidence":"GFP-tagging, phosphoserine-to-Ala/Asp mutagenesis, immunofluorescence, co-IP, and PLC-pathway/PfPKB comparisons","pmids":["22479457","22558243"],"confidence":"Medium","gaps":["Actual function of GAP45 phosphorylation remains unresolved","Overlap with PfPKB activity complicates attribution to CDPK1 in vivo"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2012,"claim":"The activation mechanism was refined by showing Ca2+-dependent CaM-LD binding to the J-domain P3 region drives activity, and that blocking this interaction pharmacologically stops microneme discharge and invasion—linking the activation switch to a druggable functional output.","evidence":"Peptide binding assays, J-domain mutagenesis, kinase assay, microneme secretion and invasion assays, purfalcamine/P3-peptide inhibition; MS mapping of autophosphorylation and NTE ATP-binding site","pmids":["23204525","22539638"],"confidence":"High","gaps":["Structural basis of NTE ATP-binding site unresolved","Whether P3-region interaction is regulated in vivo not shown"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2014,"claim":"Functional conservation and druggability were tested by heterologous complementation in Toxoplasma, showing PfCDPK1 rescues an egress defect only when membrane-localized and catalytically active, and that its activity is selectively inhibitable.","evidence":"Complementation in T. gondii TgCDPK3-null parasites, gatekeeper/membrane-motif mutagenesis, egress and drug-sensitivity assays","pmids":["24550330"],"confidence":"Medium","gaps":["Rescue in a heterologous system may not reflect native P. falciparum egress role","Direct egress substrates in T. gondii context not identified"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2015,"claim":"The upstream regulator was placed by phosphoproteomics identifying PfCDPK1 as a PfPKG target, positioning it downstream of PfPKG in the cGMP cascade controlling egress and invasion.","evidence":"Quantitative global phosphoproteomics with chemical and genetic PfPKG inhibition","pmids":["26149123"],"confidence":"Medium","gaps":["Direct versus indirect phosphorylation by PfPKG not distinguished","Functional consequence of PKG-dependent phosphosites on CDPK1 untested"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2016,"claim":"Conditional knockdown established PfCDPK1 as critical for P. falciparum invasion and, via phosphoproteomics, expanded its substrate set to IMC/motor proteins and PfPKA-R, revealing Ca2+/CDPK1–cAMP/PKA cross-talk.","evidence":"Conditional knockdown, comparative phosphoproteomics, in vitro kinase assay, PKA activity assay; CRISPR T145M gatekeeper mutant with compensatory kinase upregulation","pmids":["28680058","27923926"],"confidence":"High","gaps":["Compensation by PKG/CDPK5/CDPK6 complicates loss-of-function interpretation","Which invasion phenotypes are direct CDPK1 effects not fully separated"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2018,"claim":"A direct egress substrate was defined by showing PfCDPK1 binds and Ca2+-dependently phosphorylates PfSERA5, enhancing its protease activity, and that inhibiting this blocks merozoite egress.","evidence":"IP-MS, co-sedimentation, reciprocal co-IP, co-immunolocalization, in vitro kinase assay, purfalcamine treatment, and egress assay","pmids":["29716996"],"confidence":"High","gaps":["In vivo requirement of the specific phosphosites for egress not genetically confirmed"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2020,"claim":"How CDPK1 is organized into a signaling hub and how membrane engagement is dynamically controlled were addressed: Pf14-3-3I binds phospho-CDPK1 at a Mode-I motif to scaffold a multiprotein complex, and dynamic palmitoylation controls merozoite membrane localization, both required for microneme secretion and invasion.","evidence":"Co-IP, gel filtration, ELISA, SPR/ITC, MD simulation for 14-3-3I; acyl biotin exchange, CuAAC imaging, and 2-bromopalmitate treatment for palmitoylation","pmids":["32817103","32484216","32003970"],"confidence":"High","gaps":["Full composition of the 14-3-3I-scaffolded complex not defined","Identity of the palmitoyl acyltransferase acting on CDPK1 unknown"],"attribution":[{"species":"Plasmodium falciparum","strain":"3D7"}]},{"year":2006,"claim":"A candidate regulator was proposed by showing PfRKIP is a weak substrate that boosts CDPK1 autophosphorylation while dampening substrate phosphorylation, hinting at feedback modulation.","evidence":"Recombinant in vitro kinase and autophosphorylation assays","pmids":["17123645"],"confidence":"Low","gaps":["Single in vitro assay without in vivo validation of the regulatory interaction","Physiological relevance of RKIP modulation unknown"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2022,"claim":"A structural hypothesis for activation was generated computationally, proposing the CAD allosterically stabilizes the kinase active conformation via an αC–β3 salt bridge.","evidence":"Microsecond-scale MD simulation of modeled PfCDPK1 with and without the CAD","pmids":["35709874"],"confidence":"Low","gaps":["Purely computational, no experimental or structural validation","Salt-bridge mechanism not tested by mutagenesis in the intact kinase"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2024,"claim":"New potential regulatory links were reported: a Ca2+-dependent phosphatase PP7 co-IPs with PfCDPK1, and in P. berghei FBXO1-dependent ubiquitination shows interplay with CDPK1-dependent phosphorylation in egress/IMC processes.","evidence":"Co-immunoprecipitation for PP7; ubiquitinomic profiling with FBXO1 deletion in P. berghei","pmids":["39387582","36898988"],"confidence":"Low","gaps":["Single co-IP for PP7 without functional characterization on the CDPK1 side","FBXO1–CDPK1 mechanistic relationship not directly demonstrated for PF3D7_1423600"],"attribution":[{"species":"Plasmodium falciparum","strain":""},{"species":"Plasmodium berghei","strain":""}]},{"year":null,"claim":"The structural mechanism coupling Ca2+ binding to catalytic activation in the intact kinase, and the in vivo phosphosite requirements distinguishing which of CDPK1's many substrates are functionally essential for egress versus invasion, remain unresolved.","evidence":"","pmids":[],"confidence":"Low","gaps":["No experimental full-length structure of active/inactive states","Substrate-specific genetic dissection of egress versus invasion roles incomplete","Species divergence between P. falciparum (blood-stage essential) and P. berghei (sexual-stage essential) not mechanistically reconciled"],"attribution":[]}],"mechanism_profile":{"molecular_activity":[],"localization":[],"pathway":[],"complexes":["Pf14-3-3I-scaffolded multiprotein signaling complex (phosphorylation-dependent) [#20]","Glideosome/actomyosin motor complex (via GAP45/MTIP substrates) [#5, #7, #9]"],"partners":["MTIP (SUBSTRATE) [#5]","GAP45 (SUBSTRATE) [#5, #7, #9, #12]","PFSERA5 (BINDING PARTNER AND SUBSTRATE) [#18]","PFPKA-R / PFPKA (SUBSTRATE AND REGULATORY CROSS-TALK) [#16]","PFPKG (UPSTREAM KINASE) [#15]","PF14-3-3I (PHOSPHO-DEPENDENT SCAFFOLD) [#20]","PFRKIP/PFPE-PB1 (WEAK SUBSTRATE/CANDIDATE REGULATOR) [#19]","PP7 PHOSPHATASE (CO-IP INTERACTOR) [#23]"],"other_free_text":["Plant-like CDPK with N-terminal kinase domain and C-terminal calmodulin-like domain bearing four EF-hands; activated by Ca2+ (K0.5 ~15 µM), with EF-hand sites I and II critical [#0, #1].","Activation involves N-terminal extension, autophosphorylation, and Ca2+-dependent CaM-LD binding to the J-domain P3 region (Leu356–Thr370) [#10, #11].","Membrane targeting via dual acylation (myristoylation + palmitoylation) plus a basic motif; palmitoylation is dynamic and K+-regulated [#3, #21].","In P. falciparum critical for merozoite egress and erythrocyte invasion; in P. berghei dispensable in blood/liver stages but essential in mosquito sexual stages for translational activation of repressed zygote mRNAs [#8, #13, #16].","A CAD-mediated allosteric activation model (αC–β3 salt bridge) is supported only by MD simulation [#22]."]}},"prefetch_data":{},"corpus_meta":[{"pmid":"15479470","id":"PMC_15479470","title":"Protein kinases of the human malaria parasite Plasmodium falciparum: the kinome of a divergent eukaryote.","date":"2004","source":"BMC genomics","url":"https://pubmed.ncbi.nlm.nih.gov/15479470","citation_count":416,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["curated_ref"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"15137943","id":"PMC_15137943","title":"Calcium and a calcium-dependent protein kinase regulate gamete formation and mosquito transmission in a malaria parasite.","date":"2004","source":"Cell","url":"https://pubmed.ncbi.nlm.nih.gov/15137943","citation_count":365,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["calcium-dependent protein 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approach.","date":"2023","source":"In silico pharmacology","url":"https://pubmed.ncbi.nlm.nih.gov/38130691","citation_count":3,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["calcium-dependent protein kinase"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"26222913","id":"PMC_26222913","title":"Global expression profiling reveals shared and distinct transcript signatures in arrested act2(-) and CDPK4(-) Plasmodium berghei gametocytes.","date":"2015","source":"Molecular and biochemical parasitology","url":"https://pubmed.ncbi.nlm.nih.gov/26222913","citation_count":3,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["calcium-dependent protein kinase"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"39387582","id":"PMC_39387582","title":"Plasmodium falciparum protein phosphatase PP7 is required for early ring-stage development.","date":"2024","source":"mBio","url":"https://pubmed.ncbi.nlm.nih.gov/39387582","citation_count":2,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["calcium-dependent protein kinase"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"28746405","id":"PMC_28746405","title":"Biophysical characterization of the calmodulin-like domain of Plasmodium falciparum calcium dependent protein kinase 3.","date":"2017","source":"PloS one","url":"https://pubmed.ncbi.nlm.nih.gov/28746405","citation_count":1,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["calcium-dependent protein kinase"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"15137935","id":"PMC_15137935","title":"Gamete interruptus; a novel calcium-dependent kinase is essential for malaria sexual reproduction.","date":"2004","source":"Cell","url":"https://pubmed.ncbi.nlm.nih.gov/15137935","citation_count":1,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["calcium-dependent protein kinase"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"38915420","id":"PMC_38915420","title":"Amodiaquine drug pressure selects nonsynonymous mutations in pantothenate kinase 1, diacylglycerol kinase, and phosphatidylinositol-4 kinase in Plasmodium berghei ANKA.","date":"2023","source":"Open research Africa","url":"https://pubmed.ncbi.nlm.nih.gov/38915420","citation_count":1,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["calcium-dependent protein kinase"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"35709874","id":"PMC_35709874","title":"Allosteric regulation of the inactive to active state conformational transition in CDPK1 protein of Plasmodium falciparum.","date":"2022","source":"International journal of biological macromolecules","url":"https://pubmed.ncbi.nlm.nih.gov/35709874","citation_count":1,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["calcium-dependent protein kinase"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"40339062","id":"PMC_40339062","title":"Versatile Imidazole Scaffold with Potent Activity against Multiple Apicomplexan Parasites.","date":"2025","source":"ACS infectious diseases","url":"https://pubmed.ncbi.nlm.nih.gov/40339062","citation_count":0,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["calcium-dependent protein kinase"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"42300840","id":"PMC_42300840","title":"Proteogenomic Analysis of CDPK1 Mutant in Plasmodium falciparum.","date":"2026","source":"Omics : a journal of integrative biology","url":"https://pubmed.ncbi.nlm.nih.gov/42300840","citation_count":0,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["calcium-dependent protein kinase"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":71288,"output_tokens":8862,"usd":0.289673,"retried_sync":true},"stage2":{"model":"claude-opus-4-8","input_tokens":15819,"output_tokens":7221,"usd":0.12981,"stage2_stop_reason":"end_turn"},"total_usd":0.419483,"stage1_batch_id":"msgbatch_011BPjN2BL33F8cJXD1r7V7T","stage2_batch_id":"msgbatch_01Qwg6vP7qxkpL6Gsc7tajsb","note":"batch pricing = 50% of standard"},"stage1_raw":"Looking at the corpus, I need to identify PF3D7_1423600, described as a \"calcium-dependent protein kinase, putative.\" I need to determine which CDPK family member this corresponds to.\n\nReviewing the papers: The corpus contains papers about PfCDPK1, PfCDPK3, PfCDPK4, PfCDPK5, PfCDPK7, and PbCDPK1/3/4. I need to determine which specific gene is PF3D7_1423600.\n\nBased on PlasmoDB, PF3D7_1423600 is **PfCDPK1** (calcium-dependent protein kinase 1). This is the gene described in the early papers by Zhao et al. (1993, PMID:8440720) as \"PfCPK\" and subsequently characterized extensively as PfCDPK1.\n\nNow I'll extract mechanistic discoveries specifically about PfCDPK1 (PF3D7_1423600), being careful not to include findings about other CDPKs (CDPK3, CDPK4, CDPK5, CDPK7) unless they directly establish something about PfCDPK1 itself.\n\n```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1993,\n      \"finding\": \"PfCDPK1 (PfCPK) was identified as a calcium-dependent protein kinase with an N-terminal kinase domain and C-terminal EF-hand calcium-binding domain (four EF-hand motifs). Recombinant protein expressed in E. coli exhibited Ca2+-dependent protein kinase activity, establishing it as a plant-like CDPK.\",\n      \"method\": \"Molecular cloning, sequence analysis, recombinant expression in E. coli, in vitro kinase assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — in vitro enzymatic reconstitution demonstrating Ca2+-dependent kinase activity, replicated by subsequent studies\",\n      \"pmids\": [\"8440720\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 1994,\n      \"finding\": \"PfCDPK1 has four EF-hand calcium-binding sites in its C-terminal domain. EF-hand sites I and II are crucial for both Ca2+-induced conformational change and enzymatic activation; site II mutations almost completely abolish kinase activity, site I mutations dramatically reduce Ca2+-sensitivity and activation. Sites III and IV have minor effects. The kinase is activated by Ca2+ (K0.5 = 15 µM) and undergoes autophosphorylation on serine and threonine residues. It preferentially phosphorylates casein and histone H1 in vitro.\",\n      \"method\": \"Site-directed mutagenesis of EF-hand motifs (Glu→Lys or Glu→Gln), circular dichroism, in vitro kinase assay, 45Ca2+ binding, autophosphorylation assay\",\n      \"journal\": \"Biochemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — mutagenesis of individual Ca2+-binding sites combined with biochemical assays; replicated across two papers (PMID:8142371, PMID:7808482)\",\n      \"pmids\": [\"8142371\", \"7808482\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 1994,\n      \"finding\": \"Purified recombinant PfCDPK1 preferentially phosphorylates proteins of the host erythrocytic membrane in vitro but phosphorylates parasitic proteins only to a minor extent. Calmodulin antagonists (calmidazolium, trifluoperazine, W-7, ophiobolin A) inhibit kinase activation at higher concentrations than needed to inhibit calmodulin-mediated effects. The kinase is mainly expressed in ring and schizont stages and localizes predominantly to the parasitic membrane-organelle fraction and partially to the erythrocytic membrane.\",\n      \"method\": \"In vitro kinase assay with erythrocytic membrane proteins, calmodulin antagonist inhibition assay, immunoblotting with polyclonal antiserum, subcellular fractionation\",\n      \"journal\": \"Molecular and biochemical parasitology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct in vitro substrate phosphorylation and fractionation-based localization, single lab, multiple methods\",\n      \"pmids\": [\"7808482\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"PfCDPK1 contains three N-terminal membrane-anchoring motifs: a myristoylation consensus sequence, a putative palmitoylation site, and a basic motif. The kinase is myristoylated both in vivo (endogenous) and in vitro. Dual acylation (myristoylation + palmitoylation) together with the basic cluster are required for correct targeting of PfCDPK1 to the parasitophorous vacuole and the tubovesicular system, as shown by immunogold electron microscopy and GFP mutagenesis experiments.\",\n      \"method\": \"Immunogold electron microscopy, GFP fusion mutagenesis (acylation site mutants), in vitro myristoylation assay, subcellular targeting experiments\",\n      \"journal\": \"Molecular microbiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — direct mutagenesis of acylation motifs combined with immunogold EM and GFP localization establishing targeting mechanism\",\n      \"pmids\": [\"15491359\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"The calmodulin-like domain (CaM-LD) of a Plasmodium CDPK (studied using spectroscopic/biophysical methods applicable to PfCDPK1 regulatory domain) is composed of two lobes with differing Ca2+ affinities: the C-lobe has two cooperatively interacting high-affinity sites (Kd ~5.6 nM) and the N-lobe has two weaker sites (Kd ~110 nM). The junction (J) region has an essential role in stabilizing the CaM-LD structure and dramatically increases Ca2+ affinity. A model is supported whereby the C-lobe interacts with the junction even at basal Ca2+ but kinase remains autoinhibited until the N-lobe weaker sites are filled.\",\n      \"method\": \"NMR spectroscopy, Ca2+ titration/binding measurements, circular dichroism, domain-construct analysis of isolated J-CaM-LD\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Weak — rigorous biophysical characterization of isolated regulatory domain construct but single lab; mechanistic model proposed but not fully validated in intact kinase\",\n      \"pmids\": [\"15126505\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"PfCDPK1 phosphorylates two components of the parasite motor complex (glideosome): myosin A tail domain-interacting protein (MTIP) at serine 47, and glideosome-associated protein 45 (GAP45) at two sites (one confirmed in parasite phosphopeptides). PfCDPK1 localizes to the periphery of P. falciparum merozoites by indirect immunofluorescence, consistent with its acting on MTIP and GAP45 at the inner membrane complex. Both PfCDPK1 activity and host cell invasion are inhibited by the kinase inhibitor K252a.\",\n      \"method\": \"In vitro kinase assay, indirect immunofluorescence, mass spectrometry-based phosphopeptide identification from parasite lysates, kinase inhibitor treatment\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — in vitro phosphorylation of substrates confirmed with MS, site-specific identification, localization, and inhibitor phenotype; replicated by subsequent studies\",\n      \"pmids\": [\"18768477\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"PfCDPK1 is coexpressed with genes encoding the parasite motor complex. A targeted gene-disruption approach showed that pfcdpk1 appears essential for parasite viability in the erythrocytic stage, and treatment with 2,6,9-trisubstituted purine inhibitors of PfCDPK1 caused sudden developmental arrest at the late schizont stage in P. falciparum, suggesting a role in motility regulation during egress/invasion.\",\n      \"method\": \"Targeted gene disruption attempt, gene expression profiling, in vitro biochemical screen, compound treatment phenotypic assay\",\n      \"journal\": \"Nature chemical biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — gene disruption combined with chemical inhibition phenotype; essentiality in asexual stage, single lab\",\n      \"pmids\": [\"18454143\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"PfCDPK1 phosphorylates PfGAP45 at nine sites in vitro (Ser31, Ser89, Ser103, Ser109, Ser121, Ser149, Ser156, Thr158, Ser173) as identified by mass spectrometry after multi-protease digestion. Phosphorylation at adjacent sites Ser156 and Thr158 is mutually exclusive, and phosphorylation at these sites interferes specifically with proteolytic cleavage by chymotrypsin or trypsin respectively, demonstrating that phosphorylation alters the kinase substrate and protease substrate properties of GAP45.\",\n      \"method\": \"In vitro kinase assay (PfCDPK1 + PfGAP45), multi-protease digestion, Ga(III)-IMAC phosphopeptide enrichment, nano-UPLC-ESI-MS/MS\",\n      \"journal\": \"Analytical biochemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — rigorous in vitro phosphorylation with multiple proteases and MS identification of phosphosites; single lab but multiple orthogonal methods\",\n      \"pmids\": [\"19549500\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"In P. berghei, CDPK1 is expressed in all life stages and is indispensable during sexual mosquito stages. Knockdown of CDPK1 in sexual stages arrested zygote development and prevented mosquito transmission. Translational and transcriptional profiling of arrested parasites revealed that CDPK1 translationally activates mRNA species in the developing zygote that remain repressed (via 3' and 5' UTRs) in macrogametes, establishing a role for CDPK1 in translational activation of repressed mRNAs.\",\n      \"method\": \"Conditional knockdown, translational profiling (polysome analysis), transcriptional profiling, mosquito transmission assays\",\n      \"journal\": \"Cell host & microbe\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — conditional knockdown with in-depth translational and transcriptional profiling revealing molecular mechanism; multiple orthogonal methods\",\n      \"pmids\": [\"22817984\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium berghei\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"PfCDPK1 phosphorylates GAP45 in P. falciparum schizonts at specific serine residues. GAP45 is assembled early into the motor complex and transported to the developing inner membrane complex. Replacing phosphorylated serines with alanine or aspartate has no apparent effect on GAP45 assembly into the motor protein complex or its subcellular location, indicating phosphorylation by PfCDPK1 at these sites is not required for GAP45 assembly.\",\n      \"method\": \"GFP-tagging of GAP45 (internal), site-directed mutagenesis of phosphoserine residues, immunofluorescence, co-immunoprecipitation, in vitro phosphorylation\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — mutagenesis and GFP imaging with negative finding on assembly; single lab, multiple methods\",\n      \"pmids\": [\"22479457\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"PfCDPK1 directly regulates the junction (J) domain: binding of the calmodulin-like domain (CaM-LD) to the P3 region (Leu356–Thr370) of the J domain occurs in a Ca2+-dependent manner. Site-directed mutagenesis of conserved hydrophobic residues in the J domain (F363A/I364A, L356A, F350A) abrogates PfCDPK1 functional activity. A P3 peptide specifically inhibits PfCDPK1 activity and blocks microneme discharge and erythrocyte invasion by P. falciparum merozoites. The PfCDPK1 inhibitor purfalcamine also blocks microneme discharge and erythrocyte invasion.\",\n      \"method\": \"In vitro binding assay (CaM-LD + J domain peptides), site-directed mutagenesis, in vitro kinase assay, microneme secretion assay, erythrocyte invasion assay, peptide inhibitor treatment\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — mutagenesis combined with binding assays, enzymatic activity, and functional invasion/secretion assays; multiple orthogonal methods\",\n      \"pmids\": [\"23204525\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"PfCDPK1 autophosphorylates at multiple sites as detected by mass spectrometry, and some of these autophosphorylation sites are at strategic locations critical for kinase activation. The N-terminal extension (NTE) of PfCDPK1 is important for its activation, and unexpectedly an ATP-binding site was identified within the NTE.\",\n      \"method\": \"Mass spectrometry (autophosphorylation site identification), molecular modeling, site-directed mutagenesis, in vitro kinase assay\",\n      \"journal\": \"FASEB journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — MS identification of autophosphorylation sites with mutagenesis validation; single lab\",\n      \"pmids\": [\"22539638\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"PfGAP45 is phosphorylated by PfCDPK1 at S89, S103, and S149 in response to phospholipase C and calcium signaling. PfPKB also phosphorylates GAP45 at the same sites. The phospholipase C pathway influences phosphorylation at S103 and S149. Phosphorylation of GAP45 at these sites is differentially regulated during parasite development but does not affect GAP45 localization or its association with the glideosome complex.\",\n      \"method\": \"In vitro kinase assay, phosphosite-specific mutagenesis, co-immunoprecipitation, immunofluorescence, PLC pathway inhibition\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vitro phosphorylation combined with pathway manipulation and mutagenesis; single lab\",\n      \"pmids\": [\"22558243\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"P. berghei CDPK1 is dispensable for erythrocytic stage invasion and intra-erythrocytic development, as well as for sporozoite invasion of hepatocytes, egress from hepatocytes, and the subsequent erythrocytic cycle. Targeted gene disruption of PbCDPK1 yielded viable erythrocytic-stage parasites; a conditional mutant confirmed CDPK1 is dispensable in pre-erythrocytic stages. PbCDPK1 plays an essential role only in mosquito sexual stages.\",\n      \"method\": \"Targeted gene disruption by homologous recombination, conditional knockdown, phenotypic assays (invasion, development, transmission)\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — clean KO with multiple stage-specific phenotypic readouts; single lab; species-specific finding in P. berghei that contrasts with P. falciparum data\",\n      \"pmids\": [\"24265753\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium berghei\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"PfCDPK1 expressed in Toxoplasma gondii TgCDPK3-null parasites rescues the egress defect, and this rescue requires both plasma membrane localization of PfCDPK1 and its kinase activity. PfCDPK1-expressing T. gondii shows increased sensitivity to purfalcamine (a PfCDPK1-specific inhibitor). Six of eight tested PfCDPK1 inhibitors selectively inhibited ionophore-induced egress in PfCDPK1-expressing strains, and gatekeeper residue determines selectivity of dasatinib and PLX-4720.\",\n      \"method\": \"Heterologous complementation in T. gondii, mutagenesis of gatekeeper residue and membrane-targeting motif, egress assay, drug sensitivity assay\",\n      \"journal\": \"Antimicrobial agents and chemotherapy\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional complementation with mechanistic mutagenesis; single lab\",\n      \"pmids\": [\"24550330\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"PfCDPK1 is phosphorylated by PfPKG, as identified by quantitative global phosphoproteomics using chemical and genetic tools to inhibit PfPKG. This places PfCDPK1 downstream of PfPKG in the cGMP signaling cascade regulating parasite egress and invasion.\",\n      \"method\": \"Quantitative global phosphoproteomics, chemical inhibition of PfPKG, genetic tools (PfPKG-null parasites)\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — quantitative phosphoproteomics identifying PfCDPK1 as a PfPKG target; single lab, indirect evidence of direct phosphorylation\",\n      \"pmids\": [\"26149123\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"PfCDPK1 is critical for erythrocyte invasion by P. falciparum merozoites, established by conditional knockdown. Comparative phosphoproteomics identified substrates of PfCDPK1 including proteins of the Inner Membrane Complex and glideosome-actomyosin motor assembly. PfCDPK1 phosphorylates PfPKA regulatory subunit (PfPKA-R) and regulates PfPKA activity, indicating cross-talk between Ca2+/CDPK1 and cAMP/PKA signaling pathways relevant to invasion.\",\n      \"method\": \"Conditional knockdown, comparative phosphoproteomics, in vitro kinase assay, PKA activity assay\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — conditional KD with quantitative phosphoproteomics and in vitro validation of substrates; multiple orthogonal methods\",\n      \"pmids\": [\"28680058\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Introduction of a methionine gatekeeper substitution (T145M) in PfCDPK1 by CRISPR/Cas9 reduced transphosphorylation activity by 47%. In mutant parasites, reduced CDPK1 activity is compensated through the action of PKG (or a kinase under PKG regulation), as T145M parasites showed increased sensitivity to the PKG inhibitor compound 2. Transcript levels of CDPK5 and CDPK6 were significantly upregulated in T145M parasites, suggesting compensatory kinase upregulation.\",\n      \"method\": \"CRISPR/Cas9 genome editing, in vitro kinase assay, compound sensitivity assay (BKI-1294, compound 2), qRT-PCR\",\n      \"journal\": \"mBio\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — CRISPR-edited parasites with chemical genetic validation; single lab\",\n      \"pmids\": [\"27923926\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"PfCDPK1 physically interacts with and phosphorylates PfSERA5 (serine repeat antigen 5) in vitro in a Ca2+-dependent manner, enhancing its proteolytic activity. This interaction was confirmed by co-sedimentation, co-immunoprecipitation, and co-immunolocalization. A PfCDPK1 inhibitor (purfalcamine) blocked phosphorylation and activation of PfSERA5 in vitro and in schizonts, blocking merozoite egress, identifying PfSERA5 as a functional substrate of PfCDPK1 in the egress pathway.\",\n      \"method\": \"Immunoprecipitation + MS (identification of interaction), co-sedimentation, co-immunoprecipitation, co-immunolocalization, in vitro kinase assay, purfalcamine inhibitor treatment, egress assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal co-IP confirmed with co-sedimentation and co-localization, in vitro phosphorylation, and functional egress assay with inhibitor; multiple orthogonal methods\",\n      \"pmids\": [\"29716996\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"The Plasmodium falciparum Raf kinase inhibitory protein ortholog (PfPE-PB1/PfRKIP) is phosphorylated by PfCDPK1 in vitro (though with ~7-fold lower specific activity than casein). The presence of PfRKIP in kinase assays greatly enhanced PfCDPK1 autophosphorylation (~5.5-fold) while diminishing substrate (casein) phosphorylation activity, suggesting PfRKIP acts as a regulator of PfCDPK1.\",\n      \"method\": \"Recombinant protein expression, in vitro kinase assay, autophosphorylation assay\",\n      \"journal\": \"Molecular and biochemical parasitology\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single in vitro kinase assay, single lab, no in vivo validation of the regulatory interaction\",\n      \"pmids\": [\"17123645\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Pf14-3-3I binds phosphorylated PfCDPK1 (via phosphorylation at the canonical Mode I-type motif 61KLGpS64) to mediate assembly of a multiprotein signaling complex in P. falciparum merozoites. This interaction was validated by co-immunoprecipitation, gel filtration chromatography, ELISA, surface plasmon resonance (binding affinity ~670 nM), and molecular dynamics simulation. The 14-3-3I/CDPK1 interaction is phosphorylation-dependent and marginally enhances CDPK1 functional activity. Disruption of the multiprotein complex (using a phospho-peptide derived from PKAr) inhibits microneme secretion and RBC invasion.\",\n      \"method\": \"Co-immunoprecipitation, gel filtration chromatography, quantitative phosphoproteomics, ELISA, surface plasmon resonance (SPR), isothermal titration calorimetry (ITC), molecular dynamics simulation, in vitro kinase assay, invasion/secretion assays\",\n      \"journal\": \"mBio / The Biochemical journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal interaction validated by multiple orthogonal biophysical and biochemical methods across two independent papers\",\n      \"pmids\": [\"32817103\", \"32484216\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"3D7\"}]\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"PfCDPK1 undergoes dynamic palmitoylation and localizes to the merozoite membrane in a palmitoylation-dependent manner, as demonstrated by acyl biotin exchange chemistry (ABE) and confocal imaging. Exposure of merozoites to low [K+] activates palmitoyl acyl transferase (PAT) activity, and PAT inhibition by 2-bromopalmitate blocks microneme secretion and RBC invasion, implicating dynamic palmitoylation of PfCDPK1 in regulation of its membrane association and function.\",\n      \"method\": \"Acyl biotin exchange (ABE) chemistry, copper-catalyzed alkyne-azide cycloaddition (CuAAC) imaging, confocal microscopy, PAT inhibitor treatment (2-bromopalmitate), microneme secretion and invasion assays\",\n      \"journal\": \"ACS infectious diseases\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ABE and imaging demonstrate dynamic palmitoylation of PfCDPK1; functional link via PAT inhibitor; single lab\",\n      \"pmids\": [\"32003970\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"In the absence of the CAD (calmodulin-like activation domain), the salt bridge between Glu116 (αC-helix) and Lys85 (β3-sheet) of the PfCDPK1 kinase domain breaks after 200 ns of MD simulation, resulting in an inactive kinase conformation. In the complete protein (with CAD), the salt bridge remains intact, revealing that the CAD domain allosterically stabilizes the active conformation of the kinase domain. This represents a novel CAD-mediated allosteric activation mechanism.\",\n      \"method\": \"Microsecond-scale molecular dynamics (MD) simulation of modeled PfCDPK1 structures (complete protein vs. kinase domain alone), in silico screening\",\n      \"journal\": \"International journal of biological macromolecules\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 4 / Weak — computational MD simulation only, no experimental biochemical or structural validation of the allosteric mechanism\",\n      \"pmids\": [\"35709874\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"PP7 (a Ca2+-dependent phosphatase) physically interacts with PfCDPK1, as identified by co-immunoprecipitation/interaction studies, consistent with a role for both proteins in calcium signaling pathways during blood-stage development.\",\n      \"method\": \"Co-immunoprecipitation (interaction identified in the context of PP7 function studies)\",\n      \"journal\": \"mBio\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single co-IP interaction reported as part of a study focused on PP7, not PfCDPK1; no functional characterization of the PfCDPK1 side of the interaction\",\n      \"pmids\": [\"39387582\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"In P. berghei, SCFFBXO1-dependent ubiquitination and CDPK1-dependent phosphorylation show functional interplay: ubiquitinomic surveys identified FBXO1-dependent ubiquitination of proteins important for egress and IMC organization that overlap with CDPK1-regulated processes, and the study demonstrates an interplay between FBXO1-dependent ubiquitination and phosphorylation via CDPK1.\",\n      \"method\": \"Ubiquitinomic profiling (mass spectrometry), genetic deletion of FBXO1, phenotypic assays\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — CDPK1 interplay mentioned as part of a study focused on SCFFBXO1; the specific mechanistic relationship between FBXO1 and CDPK1 is not directly demonstrated for PF3D7_1423600\",\n      \"pmids\": [\"36898988\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium berghei\", \"strain\": \"\"}]\n    }\n  ],\n  \"current_model\": \"PfCDPK1 (PF3D7_1423600) is a plant-like calcium-dependent protein kinase that is activated by Ca2+ binding to its C-terminal calmodulin-like domain (EF-hands I and II being critical for activation), is dually acylated (myristoylated and palmitoylated) for membrane targeting to the inner membrane complex/parasitophorous vacuole, and phosphorylates key glideosome components (GAP45, MTIP) as well as PfSERA5, PfPKA-R, and PfRKIP to regulate microneme secretion, erythrocyte invasion, and merozoite egress; it is positioned downstream of PfPKG in the cGMP/Ca2+ signaling cascade, assembles into a 14-3-3I-mediated multiprotein signaling complex in a phosphorylation-dependent manner, and is essential for mosquito-stage sexual development where it translationally activates repressed zygote mRNAs.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"PfCDPK1 (PF3D7_1423600) is a plant-like calcium-dependent protein kinase that couples Ca2+ signaling to the invasion and egress machinery of the malaria parasite, comprising an N-terminal kinase domain and a C-terminal calmodulin-like regulatory domain bearing four EF-hand motifs [#0]. Ca2+ binding (K0.5 ~15 µM) activates the enzyme, with EF-hand sites I and II being critical for the conformational change and catalytic activation while sites III and IV contribute minimally [#1]; activation additionally depends on the N-terminal extension and on autophosphorylation at sites positioned for kinase activation [#11], and on Ca2+-dependent engagement of the junction (J) domain P3 region by the calmodulin-like domain, since P3 peptides or J-domain hydrophobic mutations abrogate activity, block microneme discharge, and block erythrocyte invasion [#10]. The kinase is targeted to parasite membranes—including the parasitophorous vacuole, tubovesicular system, and merozoite periphery/inner membrane complex—through dual acylation (myristoylation plus palmitoylation) and a basic cluster, with dynamic palmitoylation regulating membrane association during invasion [#3, #5, #21]. Functionally, PfCDPK1 phosphorylates glideosome/motor components MTIP and GAP45 [#5, #7], the egress protease PfSERA5 (which it also binds and activates) [#18], and the PKA regulatory subunit PfPKA-R, thereby linking Ca2+/CDPK1 to cAMP/PKA signaling [#16]; it sits downstream of PfPKG in the cGMP cascade [#15] and assembles into a phosphorylation-dependent Pf14-3-3I-scaffolded multiprotein signaling complex whose disruption blocks microneme secretion and invasion [#20]. In asexual blood stages of P. falciparum the kinase is essential/critical for merozoite egress and erythrocyte invasion [#6, #16], whereas in P. berghei CDPK1 is dispensable for erythrocytic and pre-erythrocytic development and is instead essential in the mosquito sexual stages, where it translationally activates repressed zygote mRNAs [#8, #13].\",\n  \"teleology\": [\n    {\n      \"year\": 1993,\n      \"claim\": \"Establishing what class of enzyme this gene encodes was the first requirement; cloning and reconstitution showed it is a plant-like CDPK with an intramolecular Ca2+ sensor rather than a canonical kinase requiring separate calmodulin.\",\n      \"evidence\": \"Molecular cloning, recombinant expression in E. coli, and in vitro Ca2+-dependent kinase assay\",\n      \"pmids\": [\"8440720\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Physiological substrates not identified\", \"In vivo localization and stage expression not yet defined\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 1994,\n      \"claim\": \"How Ca2+ actually activates the kinase was resolved by dissecting the four EF-hands, showing that sites I and II drive the activating conformational change while III and IV are minor—defining the regulatory logic of the sensor domain.\",\n      \"evidence\": \"Site-directed mutagenesis of EF-hand motifs with circular dichroism, 45Ca2+ binding, autophosphorylation, and in vitro kinase assays; substrate preference for casein and histone H1\",\n      \"pmids\": [\"8142371\", \"7808482\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Casein/histone are generic in vitro substrates, not physiological targets\", \"Mechanism linking Ca2+ binding to catalytic activation not resolved at structural level\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 1994,\n      \"claim\": \"Whether the kinase acts on host or parasite proteins and where it resides was addressed by fractionation and in vitro substrate profiling, pointing to membrane-organelle localization and possible host erythrocyte membrane targets.\",\n      \"evidence\": \"In vitro kinase assay with erythrocyte membrane proteins, calmodulin antagonist inhibition, immunoblotting, and subcellular fractionation\",\n      \"pmids\": [\"7808482\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Host membrane phosphorylation not confirmed in vivo\", \"Fractionation localization lacks organelle-level resolution\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"How a soluble kinase reaches its site of action was answered by identifying dual acylation plus a basic motif as the membrane-targeting determinant directing PfCDPK1 to the parasitophorous vacuole and tubovesicular system.\",\n      \"evidence\": \"Immunogold EM, GFP acylation-mutant localization, and in vitro myristoylation assay\",\n      \"pmids\": [\"15491359\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Palmitoyl transferase responsible not identified here\", \"Functional consequence of mistargeting on kinase activity not tested\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"The biophysical basis of Ca2+ sensitivity was quantified by showing the regulatory domain has a high-affinity C-lobe and weaker N-lobe, with the junction region tuning affinity, refining the model of autoinhibition release.\",\n      \"evidence\": \"NMR, Ca2+ titration, and CD on isolated J-CaM-LD constructs\",\n      \"pmids\": [\"15126505\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Model built on isolated domain, not intact kinase\", \"Single-lab biophysical study\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"The physiological substrate question was answered by identifying glideosome motor components MTIP and GAP45 as targets, connecting the kinase to the invasion motor, alongside genetic and chemical evidence for essentiality.\",\n      \"evidence\": \"In vitro kinase assays with MS phosphosite mapping, immunofluorescence, K252a/purine inhibitor treatment, and targeted disruption attempt\",\n      \"pmids\": [\"18768477\", \"18454143\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Functional consequence of MTIP/GAP45 phosphorylation on motor activity not defined\", \"Gene-disruption essentiality inferred from failed knockout\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"The extent and consequence of GAP45 phosphorylation was mapped, revealing nine sites and demonstrating that phosphorylation alters GAP45's protease-accessibility, hinting at a structural regulatory effect.\",\n      \"evidence\": \"In vitro kinase assay, multi-protease digestion, IMAC enrichment, and nano-UPLC-MS/MS\",\n      \"pmids\": [\"19549500\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo occupancy of these nine sites unknown\", \"Biological readout of altered protease sensitivity untested\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Species-divergent roles emerged: in P. berghei CDPK1 is dispensable in blood/pre-erythrocytic stages but essential in mosquito sexual stages, where it was shown to translationally activate mRNAs repressed in the macrogamete.\",\n      \"evidence\": \"Conditional knockdown with polysome/translational and transcriptional profiling and mosquito transmission assays in P. berghei\",\n      \"pmids\": [\"22817984\", \"24265753\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular mechanism of translational activation (direct targets) not defined\", \"Whether P. falciparum CDPK1 shares this sexual-stage function untested\"],\n      \"attribution\": [{\"species\": \"Plasmodium berghei\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Whether GAP45 phosphorylation controls motor assembly was tested and answered negatively—phosphosite mutants assembled and localized normally—refocusing GAP45 phosphorylation's role away from assembly.\",\n      \"evidence\": \"GFP-tagging, phosphoserine-to-Ala/Asp mutagenesis, immunofluorescence, co-IP, and PLC-pathway/PfPKB comparisons\",\n      \"pmids\": [\"22479457\", \"22558243\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Actual function of GAP45 phosphorylation remains unresolved\", \"Overlap with PfPKB activity complicates attribution to CDPK1 in vivo\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"The activation mechanism was refined by showing Ca2+-dependent CaM-LD binding to the J-domain P3 region drives activity, and that blocking this interaction pharmacologically stops microneme discharge and invasion—linking the activation switch to a druggable functional output.\",\n      \"evidence\": \"Peptide binding assays, J-domain mutagenesis, kinase assay, microneme secretion and invasion assays, purfalcamine/P3-peptide inhibition; MS mapping of autophosphorylation and NTE ATP-binding site\",\n      \"pmids\": [\"23204525\", \"22539638\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of NTE ATP-binding site unresolved\", \"Whether P3-region interaction is regulated in vivo not shown\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Functional conservation and druggability were tested by heterologous complementation in Toxoplasma, showing PfCDPK1 rescues an egress defect only when membrane-localized and catalytically active, and that its activity is selectively inhibitable.\",\n      \"evidence\": \"Complementation in T. gondii TgCDPK3-null parasites, gatekeeper/membrane-motif mutagenesis, egress and drug-sensitivity assays\",\n      \"pmids\": [\"24550330\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Rescue in a heterologous system may not reflect native P. falciparum egress role\", \"Direct egress substrates in T. gondii context not identified\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"The upstream regulator was placed by phosphoproteomics identifying PfCDPK1 as a PfPKG target, positioning it downstream of PfPKG in the cGMP cascade controlling egress and invasion.\",\n      \"evidence\": \"Quantitative global phosphoproteomics with chemical and genetic PfPKG inhibition\",\n      \"pmids\": [\"26149123\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct versus indirect phosphorylation by PfPKG not distinguished\", \"Functional consequence of PKG-dependent phosphosites on CDPK1 untested\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Conditional knockdown established PfCDPK1 as critical for P. falciparum invasion and, via phosphoproteomics, expanded its substrate set to IMC/motor proteins and PfPKA-R, revealing Ca2+/CDPK1–cAMP/PKA cross-talk.\",\n      \"evidence\": \"Conditional knockdown, comparative phosphoproteomics, in vitro kinase assay, PKA activity assay; CRISPR T145M gatekeeper mutant with compensatory kinase upregulation\",\n      \"pmids\": [\"28680058\", \"27923926\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Compensation by PKG/CDPK5/CDPK6 complicates loss-of-function interpretation\", \"Which invasion phenotypes are direct CDPK1 effects not fully separated\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"A direct egress substrate was defined by showing PfCDPK1 binds and Ca2+-dependently phosphorylates PfSERA5, enhancing its protease activity, and that inhibiting this blocks merozoite egress.\",\n      \"evidence\": \"IP-MS, co-sedimentation, reciprocal co-IP, co-immunolocalization, in vitro kinase assay, purfalcamine treatment, and egress assay\",\n      \"pmids\": [\"29716996\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo requirement of the specific phosphosites for egress not genetically confirmed\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"How CDPK1 is organized into a signaling hub and how membrane engagement is dynamically controlled were addressed: Pf14-3-3I binds phospho-CDPK1 at a Mode-I motif to scaffold a multiprotein complex, and dynamic palmitoylation controls merozoite membrane localization, both required for microneme secretion and invasion.\",\n      \"evidence\": \"Co-IP, gel filtration, ELISA, SPR/ITC, MD simulation for 14-3-3I; acyl biotin exchange, CuAAC imaging, and 2-bromopalmitate treatment for palmitoylation\",\n      \"pmids\": [\"32817103\", \"32484216\", \"32003970\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Full composition of the 14-3-3I-scaffolded complex not defined\", \"Identity of the palmitoyl acyltransferase acting on CDPK1 unknown\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"3D7\"}]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"A candidate regulator was proposed by showing PfRKIP is a weak substrate that boosts CDPK1 autophosphorylation while dampening substrate phosphorylation, hinting at feedback modulation.\",\n      \"evidence\": \"Recombinant in vitro kinase and autophosphorylation assays\",\n      \"pmids\": [\"17123645\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Single in vitro assay without in vivo validation of the regulatory interaction\", \"Physiological relevance of RKIP modulation unknown\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"A structural hypothesis for activation was generated computationally, proposing the CAD allosterically stabilizes the kinase active conformation via an αC–β3 salt bridge.\",\n      \"evidence\": \"Microsecond-scale MD simulation of modeled PfCDPK1 with and without the CAD\",\n      \"pmids\": [\"35709874\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Purely computational, no experimental or structural validation\", \"Salt-bridge mechanism not tested by mutagenesis in the intact kinase\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"New potential regulatory links were reported: a Ca2+-dependent phosphatase PP7 co-IPs with PfCDPK1, and in P. berghei FBXO1-dependent ubiquitination shows interplay with CDPK1-dependent phosphorylation in egress/IMC processes.\",\n      \"evidence\": \"Co-immunoprecipitation for PP7; ubiquitinomic profiling with FBXO1 deletion in P. berghei\",\n      \"pmids\": [\"39387582\", \"36898988\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Single co-IP for PP7 without functional characterization on the CDPK1 side\", \"FBXO1–CDPK1 mechanistic relationship not directly demonstrated for PF3D7_1423600\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}, {\"species\": \"Plasmodium berghei\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The structural mechanism coupling Ca2+ binding to catalytic activation in the intact kinase, and the in vivo phosphosite requirements distinguishing which of CDPK1's many substrates are functionally essential for egress versus invasion, remain unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No experimental full-length structure of active/inactive states\", \"Substrate-specific genetic dissection of egress versus invasion roles incomplete\", \"Species divergence between P. falciparum (blood-stage essential) and P. berghei (sexual-stage essential) not mechanistically reconciled\"],\n      \"attribution\": []\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0004683\", \"supporting_discovery_ids\": [0, 1, 5, 7, 18]},\n      {\"term_id\": \"GO:0005509\", \"supporting_discovery_ids\": [0, 1, 4, 10]},\n      {\"term_id\": \"GO:0046777\", \"supporting_discovery_ids\": [1, 11]},\n      {\"term_id\": \"GO:0005524\", \"supporting_discovery_ids\": [11]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0020002\", \"supporting_discovery_ids\": [2, 3, 21]},\n      {\"term_id\": \"GO:0020036\", \"supporting_discovery_ids\": [5, 9]},\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [21, 14]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"GO:0044409\", \"supporting_discovery_ids\": [6, 16, 18]},\n      {\"term_id\": \"GO:0019722\", \"supporting_discovery_ids\": [0, 15, 16]},\n      {\"term_id\": \"GO:0006417\", \"supporting_discovery_ids\": [8]}\n    ],\n    \"complexes\": [\n      \"Pf14-3-3I-scaffolded multiprotein signaling complex (phosphorylation-dependent) [#20]\",\n      \"Glideosome/actomyosin motor complex (via GAP45/MTIP substrates) [#5, #7, #9]\"\n    ],\n    \"partners\": [\n      \"MTIP (substrate) [#5]\",\n      \"GAP45 (substrate) [#5, #7, #9, #12]\",\n      \"PfSERA5 (binding partner and substrate) [#18]\",\n      \"PfPKA-R / PfPKA (substrate and regulatory cross-talk) [#16]\",\n      \"PfPKG (upstream kinase) [#15]\",\n      \"Pf14-3-3I (phospho-dependent scaffold) [#20]\",\n      \"PfRKIP/PfPE-PB1 (weak substrate/candidate regulator) [#19]\",\n      \"PP7 phosphatase (co-IP interactor) [#23]\"\n    ],\n    \"other_free_text\": [\n      \"Plant-like CDPK with N-terminal kinase domain and C-terminal calmodulin-like domain bearing four EF-hands; activated by Ca2+ (K0.5 ~15 µM), with EF-hand sites I and II critical [#0, #1].\",\n      \"Activation involves N-terminal extension, autophosphorylation, and Ca2+-dependent CaM-LD binding to the J-domain P3 region (Leu356–Thr370) [#10, #11].\",\n      \"Membrane targeting via dual acylation (myristoylation + palmitoylation) plus a basic motif; palmitoylation is dynamic and K+-regulated [#3, #21].\",\n      \"In P. falciparum critical for merozoite egress and erythrocyte invasion; in P. berghei dispensable in blood/liver stages but essential in mosquito sexual stages for translational activation of repressed zygote mRNAs [#8, #13, #16].\",\n      \"A CAD-mediated allosteric activation model (αC–β3 salt bridge) is supported only by MD simulation [#22].\"\n    ]\n  }\n}","audit_flag":null,"strains":[{"strain":"Pf3D7","gene_id":"PF3D7_1423600","name":null,"product":"calcium-dependent protein kinase, putative","uniprot_acc":null,"chromosome":null,"start_pos":null},{"strain":"PbANKA","gene_id":"PBANKA_1019800","name":null,"product":"calcium-dependent protein kinase, putative","uniprot_acc":null,"chromosome":null,"start_pos":null},{"strain":"PkH","gene_id":"PKNH_1334400","name":null,"product":"calcium-dependent protein kinase, putative","uniprot_acc":null,"chromosome":null,"start_pos":null}],"gene_symbol":"","evaluation":null}