{"gene":"PF3D7_1030800","run_date":"2026-09-08T12:51:28","timeline":{"discoveries":[{"year":1991,"finding":"The P. falciparum calmodulin gene (PF3D7_1030800) exists as a single copy on chromosome 14, contains a single intron of ~506 bp with appropriate splice sites, and encodes a protein with high sequence homology (89%) to mammalian calmodulin. Primer extension studies mapped the major transcription start site 62 bases upstream of the initial ATG.","method":"Gene cloning, Southern blotting, primer extension, sequence analysis","journal":"Molecular and biochemical parasitology","confidence":"High","confidence_rationale":"Tier 1 / Strong — multiple orthogonal methods (Southern blot, sequencing, primer extension) in two independent studies (PMID:1852174 and PMID:1915742) confirming single-copy gene on chromosome 14","pmids":["1852174","1915742"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":1987,"finding":"Calmodulin (PF3D7_1030800) was detected by radioimmunoassay in free P. falciparum parasites, with levels proportional to parasite maturity. Immunoelectron microscopy localized CaM diffusely in the cytoplasm of mature parasites and concentrated at the apical end of merozoites within the ductule of rhoptries.","method":"Radioimmunoassay, immunoelectron microscopy","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — two orthogonal methods (RIA + immunoelectron microscopy), single lab","pmids":["3313391"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":1987,"finding":"Calmodulin antagonists (W7, trifluoperazine, R24571) inhibited erythrocyte invasion by merozoites and schizont maturation in P. falciparum, with invasion being more sensitive than maturation; calmodulin accumulated at the apical end of merozoites was shown by immunoelectron microscopy to be disrupted by TFP treatment, suggesting CaM at the merozoite apex plays a role in erythrocyte invasion.","method":"Calmodulin antagonist treatment of P. falciparum cultures, immunoelectron microscopy","journal":"European journal of cell biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — pharmacological inhibition with structure–activity correlation plus immunolocalization, single lab","pmids":["3127214"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":1991,"finding":"The calmodulin gene of P. falciparum is expressed approximately equally in chloroquine-resistant and chloroquine-sensitive isolates; it is not amplified or overexpressed in resistant strains, indicating that calmodulin is not involved in the mechanism of chloroquine resistance.","method":"Southern blotting, Western blotting, quantitative comparison across resistant and sensitive isolates","journal":"Experimental parasitology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — two orthogonal methods (Southern + Western), single lab; negative result for CQ-resistance involvement","pmids":["1915742"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":1995,"finding":"Calmodulin mRNA and protein levels in P. falciparum are low in early ring stages, rise to a peak around 40 h (late trophozoite/early schizont), and the protein continues to accumulate through schizogony; mRNA stability differs across stages with rapid degradation in mature trophozoites. This demonstrates that calmodulin expression is regulated at the level of transcription and mRNA degradation rather than following a constitutive housekeeping pattern.","method":"Northern blotting, pulse-chase mRNA stability assays, quantitative protein measurement across synchronized stages","journal":"Journal of biochemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods (Northern, pulse-chase, protein quantification), single lab","pmids":["8720124"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2005,"finding":"The P. falciparum calmodulin gene promoter (pfcam) contains multiple transcription-initiation sites within 180 bp upstream of the ORF, clustered in four ~30 bp regions; activity diminishes upon stepwise removal of sequence between -625 and -230 bp upstream. Nuclear factor binding to pfcam upstream sequences correlates with density of poly(dA)poly(dT) tracts, and transcription-initiation sites lie just downstream of 25 bp poly(dA)poly(dT) tracts, indicating these tracts direct promoter activity.","method":"Oligo-capping/transcript mapping, CAT reporter assays with serial deletions, electromobility-shift assays (EMSA) with poly(dA)poly(dT) competition","journal":"Molecular and biochemical parasitology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods (EMSA, reporter assays, transcript mapping), single lab","pmids":["15850701"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2006,"finding":"P. falciparum calmodulin (PF3D7_1030800) interacts in a calcium-dependent manner with a mapped CaM-binding domain in the N-terminal region of PfPKB, and co-associates with PfPKB in parasite lysates; this interaction activates PfPKB kinase activity, constituting part of a phospholipase C → calcium → calmodulin → PfPKB signaling cascade.","method":"Co-immunoprecipitation, in vitro binding assays, calmodulin-domain mapping, kinase activity assays with/without calmodulin and calcium","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP plus in vitro kinase assays, single lab","pmids":["16809343"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2007,"finding":"Blocking calmodulin function (along with phospholipase C) impaired erythrocyte invasion by P. falciparum merozoites, demonstrating that the Ca2+/calmodulin pathway is required for invasion; downstream, calmodulin-activated PfPKB phosphorylates PfGAP45, a glideosome component.","method":"Pharmacological inhibition of calmodulin and PLC in invasion assays, in vitro phosphorylation of PfGAP45","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional invasion assay plus biochemical phosphorylation assay, single lab","pmids":["18165240"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2008,"finding":"P. falciparum calmodulin activates PfPK2 (a CaMK homolog) in a calcium-dependent manner in vitro; calmodulin antagonists inhibited PfPK2 phosphorylation of histone II(AS) in vitro and reduced ring-stage parasitemia in invasion assays. PfPK2 localizes to merozoites.","method":"In vitro kinase assay with purified PfPK2, calmodulin, and Ca2+; site-directed mutagenesis of catalytic lysine; invasion assays with calmodulin antagonists; immunoelectron microscopy","journal":"Molecular and biochemical parasitology","confidence":"Medium","confidence_rationale":"Tier 1–2 / Moderate — in vitro reconstitution with mutagenesis plus cellular invasion assay, single lab","pmids":["18762219"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2015,"finding":"Calmodulin (PF3D7_1030800) is expressed in all erythrocytic stages of P. falciparum as shown by a knockin approach. In trophozoites, the calmodulin inhibitor calmidazolium (CZ) mobilizes intracellular calcium (not from the ER) under Ca2+-free extracellular conditions, indicating that calmodulin-related proteins act as intracellular Ca2+ reservoirs; the mitochondrion participates in sequestering the CZ-induced cytosolic Ca2+ rise.","method":"Knockin tagging for localization, live fluorescence Ca2+ imaging with/without CZ, ER depletion (thapsigargin), ionophore controls, mitochondrial Ca2+ buffering assay","journal":"Cellular signalling","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — knockin localization plus multiple Ca2+ imaging conditions, single lab","pmids":["26689736"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2018,"finding":"Overexpression of P. falciparum calmodulin (PfCaM) in parasites resulted in a higher cytosolic Ca2+ rise after calmidazolium challenge compared to wild-type, and increased calcium-dependent proteolytic activity, indicating that PfCaM participates in calcium homeostasis and modulates intracellular proteolysis during the erythrocytic cycle.","method":"Stable transfection/overexpression, live Ca2+ imaging with calmidazolium challenge, fluorogenic protease activity assay","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — gain-of-function overexpression with two orthogonal functional readouts, single lab","pmids":["29913151"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2020,"finding":"Recombinant P. falciparum calmodulin (PfCaM) shows higher overall conformational stability than human CaM, attributed to a more stable C-terminal domain in both Ca2+-free and Ca2+-saturated states, but exhibits similar biochemical function: comparable affinities (within ~3-fold) for small-molecule inhibitors and comparable activation of a target enzyme. These minor differences make PfCaM an unsuitable selective drug target.","method":"Biophysical characterization (thermal stability, CD, fluorescence), in vitro binding assays, enzyme activation assays comparing Pf and human CaM","journal":"FASEB bioAdvances","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — multiple in vitro biophysical and biochemical assays on recombinant protein, single lab","pmids":["32821880"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2023,"finding":"Crystal structures of Ca2+-saturated P. falciparum calmodulin (PfCaM) in complex with melittin were determined, revealing multiple binding modes lacking classical anchor interactions; different sets of residues anchor at the hydrophobic pockets compared to the canonical CaM-target recognition, and molecular dynamics simulations showed co-existing conformers of similar stability.","method":"X-ray crystallography, molecular dynamics simulations","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — crystal structure of PfCaM with functional validation by MD simulations, single lab","pmids":["36906144"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2024,"finding":"P. falciparum calmodulin (PF3D7_1030800) physically interacts with the calcium-dependent phosphatase PP7 (as shown by co-immunoprecipitation), consistent with a role for calmodulin in regulating PP7-dependent calcium signaling during early ring-stage development.","method":"Co-immunoprecipitation of PP7 with calmodulin","journal":"mBio","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — single Co-IP demonstrating interaction, single lab","pmids":["39387582"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2026,"finding":"P. falciparum calmodulin (PfCaM / PF3D7_1030800) was identified as the light chain for PfMyoF, with the MyoF neck predicted to bind up to six copies of PfCaM; pull-down experiments confirmed PfCaM as part of the PfMyoF motor complex.","method":"Pull-down assays, structural prediction","journal":"Communications biology","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single pull-down with structural prediction, single lab","pmids":["42141018"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]}],"current_model":"PF3D7_1030800 encodes a single-copy P. falciparum calmodulin whose expression is transcriptionally regulated through the blood-stage cycle (peaking in late trophozoites/schizonts), localizes to the parasite cytoplasm and concentrates at the apical end of merozoites, activates downstream kinases PfPKB and PfPK2 in a Ca2+-dependent manner to promote erythrocyte invasion, participates in calcium homeostasis and intracellular proteolysis, interacts with the phosphatase PP7 and the myosin PfMyoF, and adopts non-classical target-recognition modes as revealed by its crystal structure with melittin."},"narrative":{"mechanistic_narrative":"PF3D7_1030800 encodes the single-copy Plasmodium falciparum calmodulin, a Ca2+-sensing protein that couples intracellular calcium fluxes to blood-stage development and erythrocyte invasion [PMID:1852174, PMID:1915742, PMID:18165240]. It is present as a single intron-containing gene on chromosome 14 with high homology to mammalian calmodulin, and its expression is developmentally regulated at both transcription and mRNA stability, rising from low levels in rings to a peak in late trophozoites/schizonts, with promoter activity directed by upstream poly(dA)poly(dT) tracts [PMID:1852174, PMID:1915742, PMID:8720124, PMID:15850701]. The protein is diffusely cytoplasmic in mature parasites and concentrates at the apical end of merozoites within the rhoptry ductule, where calmodulin antagonists disrupt its localization and block erythrocyte invasion [PMID:3313391, PMID:3127214]. Mechanistically, calmodulin acts downstream of phospholipase C–generated Ca2+ signals to activate the kinases PfPKB and PfPK2 in a calcium-dependent manner, with PfPKB in turn phosphorylating the glideosome component PfGAP45 to drive invasion [PMID:16809343, PMID:18165240, PMID:18762219]. Beyond invasion, calmodulin participates in cytosolic calcium homeostasis and modulates calcium-dependent intracellular proteolysis, and interacts with the calcium-dependent phosphatase PP7 during early ring-stage development [PMID:26689736, PMID:29913151, PMID:39387582]. Structurally, Ca2+-saturated PfCaM binds targets through non-classical recognition modes lacking canonical anchor interactions, and its greater conformational stability than human calmodulin—driven by a more stable C-terminal domain—is accompanied by biochemically similar function, making it unsuitable as a selective drug target [PMID:32821880, PMID:36906144].","teleology":[{"year":1987,"claim":"Establishing whether calmodulin has a functional role in the parasite required localizing the protein and testing its requirement, which linked it to the invasion machinery.","evidence":"Radioimmunoassay and immunoelectron microscopy plus calmodulin-antagonist inhibition of invasion and maturation in P. falciparum cultures","pmids":["3313391","3127214"],"confidence":"Medium","gaps":["Antagonists are not calmodulin-specific and could act on other targets","No genetic loss-of-function to confirm requirement","Molecular events downstream of apical calmodulin not defined"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":1991,"claim":"Defining the gene architecture answered whether P. falciparum encodes calmodulin as a distinct single-copy gene and excluded a role in chloroquine resistance.","evidence":"Gene cloning, Southern/Western blotting, primer extension, and comparison across resistant and sensitive isolates","pmids":["1852174","1915742"],"confidence":"High","gaps":["Functional consequences of the sequence divergence from mammalian CaM not addressed","Regulatory basis of stage-specific expression not yet resolved"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2005,"claim":"Characterizing developmental expression and its promoter answered how calmodulin abundance is timed to the blood-stage cycle rather than being constitutive.","evidence":"Northern blotting and pulse-chase mRNA stability assays across synchronized stages, plus CAT reporter deletions and EMSA of the pfcam promoter","pmids":["8720124","15850701"],"confidence":"Medium","gaps":["Specific transcription factors binding the poly(dA)poly(dT) tracts not identified","Link between expression timing and functional demand not directly tested"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2008,"claim":"Identifying calmodulin-activated kinases established the molecular effectors connecting Ca2+ signals to invasion.","evidence":"Reciprocal Co-IP and in vitro kinase assays for PfPKB, in vitro reconstitution with catalytic-lysine mutagenesis for PfPK2, plus invasion assays and PfGAP45 phosphorylation","pmids":["16809343","18165240","18762219"],"confidence":"Medium","gaps":["Interactions shown largely in vitro/single lab without in-parasite genetic validation","Full effector network downstream of PfGAP45 phosphorylation not mapped","Contribution of each kinase to invasion not separately quantified genetically"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2018,"claim":"Perturbing calmodulin levels tested its role in calcium handling itself, extending its function beyond kinase activation to Ca2+ homeostasis and proteolysis.","evidence":"Knockin localization and calmidazolium-triggered live Ca2+ imaging, plus overexpression with fluorogenic protease activity assays in P. falciparum","pmids":["26689736","29913151"],"confidence":"Medium","gaps":["Identity of the calcium-dependent proteases modulated not defined","Mechanism linking calmodulin to a non-ER Ca2+ reservoir unresolved","Effects of overexpression may not reflect endogenous function"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2023,"claim":"Biophysical and structural characterization answered whether PfCaM differs enough from human calmodulin to be a selective target and how it engages targets.","evidence":"Thermal/CD/fluorescence stability and comparative binding/activation assays on recombinant protein, and X-ray crystallography of Ca2+-saturated PfCaM with melittin plus MD simulations","pmids":["32821880","36906144"],"confidence":"High","gaps":["Non-classical binding modes shown with melittin, not with a physiological parasite target","Functional significance of the more stable C-terminal domain in vivo unknown"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2026,"claim":"Continued interactome mapping expanded the calmodulin partner set to a phosphatase and a myosin, hinting at roles in ring-stage signaling and motor function.","evidence":"Co-immunoprecipitation of PP7, and pull-down plus structural prediction identifying PfCaM as a PfMyoF light chain","pmids":["39387582","42141018"],"confidence":"Low","gaps":["PfMyoF light-chain role rests on a single pull-down with structural prediction, not reconstituted motor assays","Functional consequences of the PP7 interaction not tested by loss-of-function","Stoichiometry of up to six CaM copies on the MyoF neck not experimentally verified"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":null,"claim":"It remains unresolved how essential calmodulin is in vivo and which of its many partners dominate specific stages, since most functional evidence relies on antagonists, overexpression, or in vitro interactions rather than conditional genetic depletion.","evidence":"No conditional knockdown/knockout of PF3D7_1030800 is present in the timeline","pmids":[],"confidence":"Low","gaps":["No genetic loss-of-function phenotype for the endogenous gene","Relative contribution of PfPKB, PfPK2, PP7, and PfMyoF interactions across stages unquantified","Physiological CaM-binding targets driving invasion not structurally captured"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]}],"mechanism_profile":{"molecular_activity":[],"localization":[],"pathway":[],"complexes":["PfMyoF motor complex (PfCaM as light chain)"],"partners":["PFPKB","PFPK2","PFGAP45 (VIA PFPKB PHOSPHORYLATION)","PP7 PHOSPHATASE","PFMYOF"],"other_free_text":["Single-copy gene on chromosome 14 with a single intron; ~89% identity to mammalian calmodulin [#0]","Developmentally regulated expression peaking in late trophozoites/schizonts, controlled at transcription and mRNA stability [#4]","Promoter activity directed by upstream poly(dA)poly(dT) tracts [#5]","Not amplified or overexpressed in chloroquine-resistant isolates; not implicated in CQ resistance [#3]","More conformationally stable than human calmodulin (stable C-terminal domain) but functionally similar; deemed unsuitable as a selective drug target [#11]","Non-classical target-recognition modes revealed by Ca2+-saturated crystal structure with melittin [#12]"]}},"prefetch_data":{},"corpus_meta":[{"pmid":"16072038","id":"PMC_16072038","title":"Plants, symbiosis and parasites: a calcium signalling connection.","date":"2005","source":"Nature reviews. 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high sequence homology (89%) to mammalian calmodulin. Primer extension studies mapped the major transcription start site 62 bases upstream of the initial ATG.\",\n      \"method\": \"Gene cloning, Southern blotting, primer extension, sequence analysis\",\n      \"journal\": \"Molecular and biochemical parasitology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — multiple orthogonal methods (Southern blot, sequencing, primer extension) in two independent studies (PMID:1852174 and PMID:1915742) confirming single-copy gene on chromosome 14\",\n      \"pmids\": [\"1852174\", \"1915742\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 1987,\n      \"finding\": \"Calmodulin (PF3D7_1030800) was detected by radioimmunoassay in free P. falciparum parasites, with levels proportional to parasite maturity. Immunoelectron microscopy localized CaM diffusely in the cytoplasm of mature parasites and concentrated at the apical end of merozoites within the ductule of rhoptries.\",\n      \"method\": \"Radioimmunoassay, immunoelectron microscopy\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — two orthogonal methods (RIA + immunoelectron microscopy), single lab\",\n      \"pmids\": [\"3313391\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 1987,\n      \"finding\": \"Calmodulin antagonists (W7, trifluoperazine, R24571) inhibited erythrocyte invasion by merozoites and schizont maturation in P. falciparum, with invasion being more sensitive than maturation; calmodulin accumulated at the apical end of merozoites was shown by immunoelectron microscopy to be disrupted by TFP treatment, suggesting CaM at the merozoite apex plays a role in erythrocyte invasion.\",\n      \"method\": \"Calmodulin antagonist treatment of P. falciparum cultures, immunoelectron microscopy\",\n      \"journal\": \"European journal of cell biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — pharmacological inhibition with structure–activity correlation plus immunolocalization, single lab\",\n      \"pmids\": [\"3127214\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 1991,\n      \"finding\": \"The calmodulin gene of P. falciparum is expressed approximately equally in chloroquine-resistant and chloroquine-sensitive isolates; it is not amplified or overexpressed in resistant strains, indicating that calmodulin is not involved in the mechanism of chloroquine resistance.\",\n      \"method\": \"Southern blotting, Western blotting, quantitative comparison across resistant and sensitive isolates\",\n      \"journal\": \"Experimental parasitology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — two orthogonal methods (Southern + Western), single lab; negative result for CQ-resistance involvement\",\n      \"pmids\": [\"1915742\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 1995,\n      \"finding\": \"Calmodulin mRNA and protein levels in P. falciparum are low in early ring stages, rise to a peak around 40 h (late trophozoite/early schizont), and the protein continues to accumulate through schizogony; mRNA stability differs across stages with rapid degradation in mature trophozoites. This demonstrates that calmodulin expression is regulated at the level of transcription and mRNA degradation rather than following a constitutive housekeeping pattern.\",\n      \"method\": \"Northern blotting, pulse-chase mRNA stability assays, quantitative protein measurement across synchronized stages\",\n      \"journal\": \"Journal of biochemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods (Northern, pulse-chase, protein quantification), single lab\",\n      \"pmids\": [\"8720124\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"The P. falciparum calmodulin gene promoter (pfcam) contains multiple transcription-initiation sites within 180 bp upstream of the ORF, clustered in four ~30 bp regions; activity diminishes upon stepwise removal of sequence between -625 and -230 bp upstream. Nuclear factor binding to pfcam upstream sequences correlates with density of poly(dA)poly(dT) tracts, and transcription-initiation sites lie just downstream of 25 bp poly(dA)poly(dT) tracts, indicating these tracts direct promoter activity.\",\n      \"method\": \"Oligo-capping/transcript mapping, CAT reporter assays with serial deletions, electromobility-shift assays (EMSA) with poly(dA)poly(dT) competition\",\n      \"journal\": \"Molecular and biochemical parasitology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods (EMSA, reporter assays, transcript mapping), single lab\",\n      \"pmids\": [\"15850701\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"P. falciparum calmodulin (PF3D7_1030800) interacts in a calcium-dependent manner with a mapped CaM-binding domain in the N-terminal region of PfPKB, and co-associates with PfPKB in parasite lysates; this interaction activates PfPKB kinase activity, constituting part of a phospholipase C → calcium → calmodulin → PfPKB signaling cascade.\",\n      \"method\": \"Co-immunoprecipitation, in vitro binding assays, calmodulin-domain mapping, kinase activity assays with/without calmodulin and calcium\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP plus in vitro kinase assays, single lab\",\n      \"pmids\": [\"16809343\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"Blocking calmodulin function (along with phospholipase C) impaired erythrocyte invasion by P. falciparum merozoites, demonstrating that the Ca2+/calmodulin pathway is required for invasion; downstream, calmodulin-activated PfPKB phosphorylates PfGAP45, a glideosome component.\",\n      \"method\": \"Pharmacological inhibition of calmodulin and PLC in invasion assays, in vitro phosphorylation of PfGAP45\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional invasion assay plus biochemical phosphorylation assay, single lab\",\n      \"pmids\": [\"18165240\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"P. falciparum calmodulin activates PfPK2 (a CaMK homolog) in a calcium-dependent manner in vitro; calmodulin antagonists inhibited PfPK2 phosphorylation of histone II(AS) in vitro and reduced ring-stage parasitemia in invasion assays. PfPK2 localizes to merozoites.\",\n      \"method\": \"In vitro kinase assay with purified PfPK2, calmodulin, and Ca2+; site-directed mutagenesis of catalytic lysine; invasion assays with calmodulin antagonists; immunoelectron microscopy\",\n      \"journal\": \"Molecular and biochemical parasitology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — in vitro reconstitution with mutagenesis plus cellular invasion assay, single lab\",\n      \"pmids\": [\"18762219\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Calmodulin (PF3D7_1030800) is expressed in all erythrocytic stages of P. falciparum as shown by a knockin approach. In trophozoites, the calmodulin inhibitor calmidazolium (CZ) mobilizes intracellular calcium (not from the ER) under Ca2+-free extracellular conditions, indicating that calmodulin-related proteins act as intracellular Ca2+ reservoirs; the mitochondrion participates in sequestering the CZ-induced cytosolic Ca2+ rise.\",\n      \"method\": \"Knockin tagging for localization, live fluorescence Ca2+ imaging with/without CZ, ER depletion (thapsigargin), ionophore controls, mitochondrial Ca2+ buffering assay\",\n      \"journal\": \"Cellular signalling\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — knockin localization plus multiple Ca2+ imaging conditions, single lab\",\n      \"pmids\": [\"26689736\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Overexpression of P. falciparum calmodulin (PfCaM) in parasites resulted in a higher cytosolic Ca2+ rise after calmidazolium challenge compared to wild-type, and increased calcium-dependent proteolytic activity, indicating that PfCaM participates in calcium homeostasis and modulates intracellular proteolysis during the erythrocytic cycle.\",\n      \"method\": \"Stable transfection/overexpression, live Ca2+ imaging with calmidazolium challenge, fluorogenic protease activity assay\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — gain-of-function overexpression with two orthogonal functional readouts, single lab\",\n      \"pmids\": [\"29913151\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Recombinant P. falciparum calmodulin (PfCaM) shows higher overall conformational stability than human CaM, attributed to a more stable C-terminal domain in both Ca2+-free and Ca2+-saturated states, but exhibits similar biochemical function: comparable affinities (within ~3-fold) for small-molecule inhibitors and comparable activation of a target enzyme. These minor differences make PfCaM an unsuitable selective drug target.\",\n      \"method\": \"Biophysical characterization (thermal stability, CD, fluorescence), in vitro binding assays, enzyme activation assays comparing Pf and human CaM\",\n      \"journal\": \"FASEB bioAdvances\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — multiple in vitro biophysical and biochemical assays on recombinant protein, single lab\",\n      \"pmids\": [\"32821880\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Crystal structures of Ca2+-saturated P. falciparum calmodulin (PfCaM) in complex with melittin were determined, revealing multiple binding modes lacking classical anchor interactions; different sets of residues anchor at the hydrophobic pockets compared to the canonical CaM-target recognition, and molecular dynamics simulations showed co-existing conformers of similar stability.\",\n      \"method\": \"X-ray crystallography, molecular dynamics simulations\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — crystal structure of PfCaM with functional validation by MD simulations, single lab\",\n      \"pmids\": [\"36906144\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"P. falciparum calmodulin (PF3D7_1030800) physically interacts with the calcium-dependent phosphatase PP7 (as shown by co-immunoprecipitation), consistent with a role for calmodulin in regulating PP7-dependent calcium signaling during early ring-stage development.\",\n      \"method\": \"Co-immunoprecipitation of PP7 with calmodulin\",\n      \"journal\": \"mBio\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — single Co-IP demonstrating interaction, single lab\",\n      \"pmids\": [\"39387582\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"P. falciparum calmodulin (PfCaM / PF3D7_1030800) was identified as the light chain for PfMyoF, with the MyoF neck predicted to bind up to six copies of PfCaM; pull-down experiments confirmed PfCaM as part of the PfMyoF motor complex.\",\n      \"method\": \"Pull-down assays, structural prediction\",\n      \"journal\": \"Communications biology\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single pull-down with structural prediction, single lab\",\n      \"pmids\": [\"42141018\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    }\n  ],\n  \"current_model\": \"PF3D7_1030800 encodes a single-copy P. falciparum calmodulin whose expression is transcriptionally regulated through the blood-stage cycle (peaking in late trophozoites/schizonts), localizes to the parasite cytoplasm and concentrates at the apical end of merozoites, activates downstream kinases PfPKB and PfPK2 in a Ca2+-dependent manner to promote erythrocyte invasion, participates in calcium homeostasis and intracellular proteolysis, interacts with the phosphatase PP7 and the myosin PfMyoF, and adopts non-classical target-recognition modes as revealed by its crystal structure with melittin.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"PF3D7_1030800 encodes the single-copy Plasmodium falciparum calmodulin, a Ca2+-sensing protein that couples intracellular calcium fluxes to blood-stage development and erythrocyte invasion [#0, #7]. It is present as a single intron-containing gene on chromosome 14 with high homology to mammalian calmodulin, and its expression is developmentally regulated at both transcription and mRNA stability, rising from low levels in rings to a peak in late trophozoites/schizonts, with promoter activity directed by upstream poly(dA)poly(dT) tracts [#0, #4, #5]. The protein is diffusely cytoplasmic in mature parasites and concentrates at the apical end of merozoites within the rhoptry ductule, where calmodulin antagonists disrupt its localization and block erythrocyte invasion [#1, #2]. Mechanistically, calmodulin acts downstream of phospholipase C–generated Ca2+ signals to activate the kinases PfPKB and PfPK2 in a calcium-dependent manner, with PfPKB in turn phosphorylating the glideosome component PfGAP45 to drive invasion [#6, #7, #8]. Beyond invasion, calmodulin participates in cytosolic calcium homeostasis and modulates calcium-dependent intracellular proteolysis, and interacts with the calcium-dependent phosphatase PP7 during early ring-stage development [#9, #10, #13]. Structurally, Ca2+-saturated PfCaM binds targets through non-classical recognition modes lacking canonical anchor interactions, and its greater conformational stability than human calmodulin—driven by a more stable C-terminal domain—is accompanied by biochemically similar function, making it unsuitable as a selective drug target [#11, #12].\",\n  \"teleology\": [\n    {\n      \"year\": 1987,\n      \"claim\": \"Establishing whether calmodulin has a functional role in the parasite required localizing the protein and testing its requirement, which linked it to the invasion machinery.\",\n      \"evidence\": \"Radioimmunoassay and immunoelectron microscopy plus calmodulin-antagonist inhibition of invasion and maturation in P. falciparum cultures\",\n      \"pmids\": [\n        \"3313391\",\n        \"3127214\"\n      ],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Antagonists are not calmodulin-specific and could act on other targets\",\n        \"No genetic loss-of-function to confirm requirement\",\n        \"Molecular events downstream of apical calmodulin not defined\"\n      ],\n      \"attribution\": [\n        {\n          \"species\": \"Plasmodium falciparum\",\n          \"strain\": \"\"\n        }\n      ]\n    },\n    {\n      \"year\": 1991,\n      \"claim\": \"Defining the gene architecture answered whether P. falciparum encodes calmodulin as a distinct single-copy gene and excluded a role in chloroquine resistance.\",\n      \"evidence\": \"Gene cloning, Southern/Western blotting, primer extension, and comparison across resistant and sensitive isolates\",\n      \"pmids\": [\n        \"1852174\",\n        \"1915742\"\n      ],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Functional consequences of the sequence divergence from mammalian CaM not addressed\",\n        \"Regulatory basis of stage-specific expression not yet resolved\"\n      ],\n      \"attribution\": [\n        {\n          \"species\": \"Plasmodium falciparum\",\n          \"strain\": \"\"\n        }\n      ]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Characterizing developmental expression and its promoter answered how calmodulin abundance is timed to the blood-stage cycle rather than being constitutive.\",\n      \"evidence\": \"Northern blotting and pulse-chase mRNA stability assays across synchronized stages, plus CAT reporter deletions and EMSA of the pfcam promoter\",\n      \"pmids\": [\n        \"8720124\",\n        \"15850701\"\n      ],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Specific transcription factors binding the poly(dA)poly(dT) tracts not identified\",\n        \"Link between expression timing and functional demand not directly tested\"\n      ],\n      \"attribution\": [\n        {\n          \"species\": \"Plasmodium falciparum\",\n          \"strain\": \"\"\n        }\n      ]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Identifying calmodulin-activated kinases established the molecular effectors connecting Ca2+ signals to invasion.\",\n      \"evidence\": \"Reciprocal Co-IP and in vitro kinase assays for PfPKB, in vitro reconstitution with catalytic-lysine mutagenesis for PfPK2, plus invasion assays and PfGAP45 phosphorylation\",\n      \"pmids\": [\n        \"16809343\",\n        \"18165240\",\n        \"18762219\"\n      ],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Interactions shown largely in vitro/single lab without in-parasite genetic validation\",\n        \"Full effector network downstream of PfGAP45 phosphorylation not mapped\",\n        \"Contribution of each kinase to invasion not separately quantified genetically\"\n      ],\n      \"attribution\": [\n        {\n          \"species\": \"Plasmodium falciparum\",\n          \"strain\": \"\"\n        }\n      ]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Perturbing calmodulin levels tested its role in calcium handling itself, extending its function beyond kinase activation to Ca2+ homeostasis and proteolysis.\",\n      \"evidence\": \"Knockin localization and calmidazolium-triggered live Ca2+ imaging, plus overexpression with fluorogenic protease activity assays in P. falciparum\",\n      \"pmids\": [\n        \"26689736\",\n        \"29913151\"\n      ],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\n        \"Identity of the calcium-dependent proteases modulated not defined\",\n        \"Mechanism linking calmodulin to a non-ER Ca2+ reservoir unresolved\",\n        \"Effects of overexpression may not reflect endogenous function\"\n      ],\n      \"attribution\": [\n        {\n          \"species\": \"Plasmodium falciparum\",\n          \"strain\": \"\"\n        }\n      ]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Biophysical and structural characterization answered whether PfCaM differs enough from human calmodulin to be a selective target and how it engages targets.\",\n      \"evidence\": \"Thermal/CD/fluorescence stability and comparative binding/activation assays on recombinant protein, and X-ray crystallography of Ca2+-saturated PfCaM with melittin plus MD simulations\",\n      \"pmids\": [\n        \"32821880\",\n        \"36906144\"\n      ],\n      \"confidence\": \"High\",\n      \"gaps\": [\n        \"Non-classical binding modes shown with melittin, not with a physiological parasite target\",\n        \"Functional significance of the more stable C-terminal domain in vivo unknown\"\n      ],\n      \"attribution\": [\n        {\n          \"species\": \"Plasmodium falciparum\",\n          \"strain\": \"\"\n        }\n      ]\n    },\n    {\n      \"year\": 2026,\n      \"claim\": \"Continued interactome mapping expanded the calmodulin partner set to a phosphatase and a myosin, hinting at roles in ring-stage signaling and motor function.\",\n      \"evidence\": \"Co-immunoprecipitation of PP7, and pull-down plus structural prediction identifying PfCaM as a PfMyoF light chain\",\n      \"pmids\": [\n        \"39387582\",\n        \"42141018\"\n      ],\n      \"confidence\": \"Low\",\n      \"gaps\": [\n        \"PfMyoF light-chain role rests on a single pull-down with structural prediction, not reconstituted motor assays\",\n        \"Functional consequences of the PP7 interaction not tested by loss-of-function\",\n        \"Stoichiometry of up to six CaM copies on the MyoF neck not experimentally verified\"\n      ],\n      \"attribution\": [\n        {\n          \"species\": \"Plasmodium falciparum\",\n          \"strain\": \"\"\n        }\n      ]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"It remains unresolved how essential calmodulin is in vivo and which of its many partners dominate specific stages, since most functional evidence relies on antagonists, overexpression, or in vitro interactions rather than conditional genetic depletion.\",\n      \"evidence\": \"No conditional knockdown/knockout of PF3D7_1030800 is present in the timeline\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\n        \"No genetic loss-of-function phenotype for the endogenous gene\",\n        \"Relative contribution of PfPKB, PfPK2, PP7, and PfMyoF interactions across stages unquantified\",\n        \"Physiological CaM-binding targets driving invasion not structurally captured\"\n      ],\n      \"attribution\": [\n        {\n          \"species\": \"Plasmodium falciparum\",\n          \"strain\": \"\"\n        }\n      ]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\n        \"term_id\": \"GO:0005516\",\n        \"supporting_discovery_ids\": [\n          6,\n          8,\n          11,\n          12\n        ]\n      },\n      {\n        \"term_id\": \"GO:0005509\",\n        \"supporting_discovery_ids\": [\n          9,\n          10,\n          12\n        ]\n      },\n      {\n        \"term_id\": \"GO:0019855\",\n        \"supporting_discovery_ids\": [\n          2,\n          11\n        ]\n      },\n      {\n        \"term_id\": \"GO:0004860\",\n        \"supporting_discovery_ids\": [\n          6,\n          8\n        ]\n      }\n    ],\n    \"localization\": [\n      {\n        \"term_id\": \"GO:0005737\",\n        \"supporting_discovery_ids\": [\n          1,\n          9\n        ]\n      },\n      {\n        \"term_id\": \"GO:0020008\",\n        \"supporting_discovery_ids\": [\n          1,\n          2\n        ]\n      }\n    ],\n    \"pathway\": [\n      {\n        \"term_id\": \"GO:0019064\",\n        \"supporting_discovery_ids\": [\n          2,\n          7,\n          8\n        ]\n      },\n      {\n        \"term_id\": \"GO:0019722\",\n        \"supporting_discovery_ids\": [\n          6,\n          9,\n          13\n        ]\n      },\n      {\n        \"term_id\": \"GO:0006874\",\n        \"supporting_discovery_ids\": [\n          9,\n          10\n        ]\n      },\n      {\n        \"term_id\": \"GO:0006508\",\n        \"supporting_discovery_ids\": [\n          10\n        ]\n      }\n    ],\n    \"complexes\": [\n      \"PfMyoF motor complex (PfCaM as light chain)\"\n    ],\n    \"partners\": [\n      \"PfPKB\",\n      \"PfPK2\",\n      \"PfGAP45 (via PfPKB phosphorylation)\",\n      \"PP7 phosphatase\",\n      \"PfMyoF\"\n    ],\n    \"other_free_text\": [\n      \"Single-copy gene on chromosome 14 with a single intron; ~89% identity to mammalian calmodulin [#0]\",\n      \"Developmentally regulated expression peaking in late trophozoites/schizonts, controlled at transcription and mRNA stability [#4]\",\n      \"Promoter activity directed by upstream poly(dA)poly(dT) tracts [#5]\",\n      \"Not amplified or overexpressed in chloroquine-resistant isolates; not implicated in CQ resistance [#3]\",\n      \"More conformationally stable than human calmodulin (stable C-terminal domain) but functionally similar; deemed unsuitable as a selective drug target [#11]\",\n      \"Non-classical target-recognition modes revealed by Ca2+-saturated crystal structure with melittin [#12]\"\n    ]\n  }\n}","audit_flag":null,"strains":[{"strain":"Pf3D7","gene_id":"PF3D7_1030800","name":null,"product":"calmodulin, putative","uniprot_acc":null,"chromosome":null,"start_pos":null},{"strain":"PbANKA","gene_id":"PBANKA_0514800","name":null,"product":"calmodulin, putative","uniprot_acc":null,"chromosome":null,"start_pos":null},{"strain":"PkH","gene_id":"PKNH_0615500","name":null,"product":"calmodulin, putative","uniprot_acc":null,"chromosome":null,"start_pos":null}],"gene_symbol":"","evaluation":null}