{"gene":"PF3D7_0818900","run_date":"2026-09-08T12:51:27","timeline":{"discoveries":[{"year":1986,"finding":"PF3D7_0818900 (HSP70/PfHsp70-1) encodes an abundant, soluble cytoplasmic polypeptide of ~75 kDa present in all asexual blood stages and gametocytes, containing tandemly repeated Gly-Gly-Met-Pro sequences, and is 70% homologous at the amino acid level to Drosophila hsp70.","method":"cDNA cloning, nucleotide sequence analysis, SDS-PAGE of parasite lysates","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — original cloning and characterization of the protein by sequence analysis and biochemical fractionation; single lab but foundational identification","pmids":["3095842"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":1991,"finding":"HSP70 (PfHsp70-1/Pfhsp) is induced by heat shock (temperature elevation from 26°C to 37°C and higher) in a transient, temperature-dependent manner; mRNA levels increase in parallel with protein synthesis. Immuno-gold electron microscopy localized Pfhsp to the nucleus of the parasite.","method":"Northern blot, in vitro translation, immuno-gold electron microscopy, metabolic labeling","journal":"Molecular and biochemical parasitology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods (Northern blot, in vitro translation, immuno-gold EM) in a single study establishing heat-shock induction and nuclear localization","pmids":["1779989"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":1992,"finding":"Expression of HSP70 (PfHsp70-1/PFHSP70-I) gene is enhanced after heat shock, and parasites remain viable after heat shock but show altered growth, suggesting HSP70 overexpression contributes to parasite survival during fever.","method":"Parasite viability assay, growth assay, heat-shock protein expression analysis","journal":"FEBS letters","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single lab, single method set, indirect mechanistic inference","pmids":["1385215"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":1994,"finding":"HSP70 (PfHsp70-1) protein is expressed in sporozoites, liver stages, and erythrocytic forms of malaria parasites, as demonstrated by monoclonal antibodies reacting with a recombinant protein encoding the carboxyl terminal half (aa 365–681). Passive transfer of these antibodies failed to neutralize sporozoite infectivity.","method":"Immunofluorescence, Western blot, passive transfer experiments with monoclonal antibodies","journal":"Parasitology research","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — two orthogonal detection methods (IFA and Western blot) demonstrating stage-specific expression; negative passive transfer result recorded explicitly","pmids":["8153120"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""},{"species":"Plasmodium berghei","strain":""},{"species":"Plasmodium yoelii","strain":""}]},{"year":1998,"finding":"HSP70 (HSC70 ortholog) from Plasmodium knowlesi merozoites binds F-actin and forms a complex with 32/34-kDa proteins; this HSC70/32/34-kDa complex inhibits actin polymerization in vitro in a calcium-independent manner abrogated by phosphatidylinositol 4,5-bisphosphate, consistent with a barbed-end capping activity.","method":"F-actin affinity chromatography, ATP-agarose binding, tryptic peptide microsequencing, Western blot, gel filtration chromatography, in vitro actin polymerization assay","journal":"Molecular and biochemical parasitology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal biochemical methods (affinity chromatography, gel filtration, in vitro functional assay) in a single study; attributed to P. knowlesi ortholog","pmids":["9662713"],"is_preprint":false,"attribution":[{"species":"Plasmodium knowlesi","strain":""}]},{"year":2001,"finding":"In P. falciparum-infected erythrocytes, host-cell Hsp70 (human, not parasite-encoded) is recruited into membrane-bound, detergent-resistant complexes in an ATP-dependent manner, and can be cross-linked to the knob subunit PfHRP1 at the erythrocyte surface, implicating host Hsp70 in knob assembly. No parasite-encoded HSP70 was detected in the erythrocyte cytoplasm at this time.","method":"Hypotonic lysis, detergent solubilization, sedimentation analysis, chemical cross-linking, co-immunoprecipitation","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal biochemical methods in one study; this paper establishes that the Hsp70 acting in the erythrocyte cytoplasm at this time point is host-derived, not PF3D7_0818900 itself","pmids":["11711553"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2003,"finding":"Putative HSP70 (DnaK) binding sites present in apicoplast transit peptides are important for correct apicoplast targeting in vivo; site-directed mutagenesis of these sites disrupted organellar targeting.","method":"Site-directed mutagenesis, in vivo organellar targeting assay","journal":"Science (New York, N.Y.)","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — site-directed mutagenesis with in vivo functional readout; single lab, functional consequence directly measured","pmids":["12560551"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2003,"finding":"PfHsp70 (HSP70/PF3D7_0818900) co-sediments with PfHsp90 in ~300 kDa, ~11S complexes, demonstrating it is a component of the PfHsp90 multi-chaperone complex in the parasite.","method":"Sedimentation analysis, size exclusion chromatography","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — co-sedimentation and gel filtration showing complex membership; two orthogonal methods but no reciprocal pulldown","pmids":["12584193"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2004,"finding":"Recombinant PfHsp70-1 (HSP70/PF3D7_0818900) was overproduced in E. coli and biochemically characterized: it exhibits basal ATPase activity with Vmax = 14.6 nmol/min/mg, Km = 616.5 µM, kcat = 1.03 min⁻¹, and exists largely as a monomer in solution.","method":"Heterologous overexpression in E. coli, nickel-chelating affinity chromatography, ATPase activity assay, gel filtration","journal":"Protein expression and purification","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro biochemical reconstitution with quantitative enzymatic characterization; multiple orthogonal methods in one study","pmids":["14711509"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2004,"finding":"Geldanamycin disrupts the PfHsp90 multi-chaperone complex that contains PfHsp70 (HSP70/PF3D7_0818900), PfPP5, and tubulin, and inhibits parasite progression from ring to trophozoite stage; repeated heat exposure (mimicking fever) promotes parasite development through this complex.","method":"Geldanamycin treatment, flow cytometry, complex disruption assay","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — pharmacological disruption with defined cellular phenotype; complex membership confirmed by prior sedimentation data; single lab","pmids":["15339915"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2005,"finding":"PfHsp70-1 (HSP70/PF3D7_0818900) functionally complements an E. coli dnaK756 mutant (thermosensitive) but not the dnaK deletion or truncation mutant. Two key amino acid residues (V401 and Q402) in the linker region between the ATPase domain and substrate-binding domain are essential for in vivo chaperone function. The substrate-binding domain of PfHsp70, when fused to the E. coli DnaK ATPase domain, retained complementation activity, demonstrating that interdomain communication is critical.","method":"In vivo complementation assay in E. coli, domain-swap chimera construction, site-directed mutagenesis","journal":"Molecular genetics and genomics : MGG","confidence":"High","confidence_rationale":"Tier 1 / Strong — reconstitution-level in vivo functional assay with mutagenesis and domain swaps; multiple rigorous controls in one study","pmids":["15973516"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2006,"finding":"15-deoxyspergualin (DSG) binds PfHsp70-1 (HSP70/PF3D7_0818900, which carries a C-terminal EEVD motif) and further stimulates its ATP-enhanced chaperone activity, but has no effect on PfHsp70-2 (which lacks EEVD). Substrate binding to PfHsp70-1 is unaffected by DSG, suggesting DSG acts via the EEVD motif to modulate ATPase-coupled chaperone cycling.","method":"Cloning, overexpression, chaperone activity assay, binding assay in presence/absence of DSG and ATP","journal":"Biochemical and biophysical research communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vitro biochemical assays comparing two Hsp70 isoforms; single lab, functional mechanistic distinction established","pmids":["16884692"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2006,"finding":"15-deoxyspergualin causes Hsp70 (HSP70/PF3D7_0818900) sequestration, leading to phosphorylation of eIF2α and stalling of protein synthesis in P. falciparum, though this requires high micromolar concentrations. At lower concentrations, DSG primarily targets trafficking of nucleus-encoded proteins to the apicoplast.","method":"Metabolic labeling, eIF2α phosphorylation assay, protein trafficking assay","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple in-cell biochemical assays; single lab; mechanistic distinction between high and low concentration effects established","pmids":["17194705"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2008,"finding":"PfHsp70-1 (HSP70/PF3D7_0818900) displays chaperone activity in vitro; amino acid substitutions introduced in the substrate-binding cavity compromise its chaperone function. Three-dimensional homology modeling was used to map domain spatial orientation.","method":"3D homology modeling, site-directed mutagenesis, in vitro chaperone activity assay","journal":"Protein and peptide letters","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — mutagenesis of substrate-binding cavity with functional in vitro readout; single lab","pmids":["19075824"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2008,"finding":"PfHsp70-1 (HSP70/PF3D7_0818900) and Pfj4 (a type II Hsp40) co-localize to the nucleus and cytoplasm of the parasite, and immunoprecipitation studies and size exclusion chromatography indicate that they directly or indirectly interact.","method":"Immunofluorescence, immuno-electron microscopy, immunoprecipitation, size exclusion chromatography, Western blot","journal":"The international journal of biochemistry & cell biology","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — co-localization and co-IP showing interaction; multiple methods but interaction directness not fully resolved","pmids":["18674634"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2009,"finding":"PfHsp70-1 (HSP70/PF3D7_0818900) has chaperone activity that is enhanced by Pfj1 (PFD0465w, the DnaJ homolog), representing the first evidence for a functional Pfj1–PfHsp70-1 interaction. The C-terminal domain of PfHsp70-1 confers thermal stability to the N-terminal nucleotide-binding domain and functions as a stabilization domain.","method":"Fluorescence spectroscopy, circular dichroism, in vitro chaperone activity assay, domain deletion analysis","journal":"Biophysical chemistry","confidence":"High","confidence_rationale":"Tier 1 / Moderate — in vitro reconstitution with multiple orthogonal biophysical methods and domain dissection; single lab","pmids":["19339102"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2009,"finding":"Pyrimidinone-amide compounds alter the ATPase activity of purified PfHsp70-1 (HSP70/PF3D7_0818900) in single-turnover assays and inhibit P. falciparum replication, demonstrating that PfHsp70-1 ATPase activity can be pharmacologically modulated.","method":"Single-turnover ATPase assay with purified recombinant PfHsp70, parasite growth inhibition assay","journal":"Bioorganic & medicinal chemistry","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — in vitro enzymatic assay combined with parasite growth assay; single lab","pmids":["19195901"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2010,"finding":"PfHsp70-1 (HSP70/PF3D7_0818900) and PfHsp40 co-localize mainly in the parasite cytosol; recombinant PfHsp40 stimulates the ATPase activity of PfHsp70-1 similarly to canonical Hsp40s. PfHsp40 cooperates with PfHsp70-1 to suppress protein aggregation in vitro. Pyrimidinone-based small molecules differentially inhibit the Hsp40-stimulated ATPase activities of plasmodial versus human Hsp70.","method":"Indirect immunofluorescence microscopy, ATPase activity assay (Hsp40-stimulated), protein aggregation suppression assay, pharmacological inhibition","journal":"Cell stress & chaperones","confidence":"High","confidence_rationale":"Tier 1 / Strong — multiple orthogonal methods (localization, enzymatic assay, aggregation assay, pharmacology); findings replicated across Hsp70 variants; single lab but rigorous","pmids":["21191678"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2011,"finding":"PfHop (PfHsp70-Hsp90 organising protein) co-localizes with PfHsp70-1 (HSP70/PF3D7_0818900) and PfHsp90 at the trophozoite stage, and co-immunoprecipitation and gel filtration confirm they form a trimeric complex, suggesting PfHop mediates functional interaction between PfHsp70-1 and PfHsp90.","method":"Co-immunoprecipitation, gel filtration chromatography, immunofluorescence co-localization","journal":"Cell stress & chaperones","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal approaches (co-IP + gel filtration + co-localization) in single lab; single study","pmids":["22005844"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2011,"finding":"Purified recombinant PfHsp70-1 (HSP70/PF3D7_0818900) chaperone activity (protein aggregation suppression) is inhibited in a concentration-dependent manner by malonganenones A–C, lapachol and bromo-β-lapachona; most of these compounds also inhibit parasite growth.","method":"Malate dehydrogenase-based aggregation suppression assay, parasite growth inhibition assay","journal":"Biological chemistry","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — in vitro reconstituted chaperone assay with purified recombinant protein, combined with parasite growth assay; single lab","pmids":["21426241"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2015,"finding":"PfHop interacts directly with PfHsp70-1 (HSP70/PF3D7_0818900) in a nucleotide-dependent fashion; ADP promotes the association more than ATP. The TPR1 and TPR2B subdomains of PfHop preferentially bind the C-terminus of PfHsp70-1, while TPR2A preferentially binds PfHsp90 C-terminus, defining the molecular basis for assembly of the PfHsp70-1/PfHop/PfHsp90 complex.","method":"Far Western blot, surface plasmon resonance (SPR), co-immunoprecipitation, split-GFP domain interaction assay","journal":"PloS one","confidence":"High","confidence_rationale":"Tier 1 / Strong — multiple orthogonal interaction methods (far Western, SPR, co-IP, split-GFP); ADP/ATP-dependent interaction and domain specificity defined in single study","pmids":["26267894"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2016,"finding":"PfHsp70-z (an Hsp110 homolog) associates with PfHsp70-1 (HSP70/PF3D7_0818900) in a nucleotide-dependent fashion as shown by co-immunoaffinity chromatography and surface plasmon resonance. PfHsp70-z possesses independent chaperone activity (protein aggregation suppression) marginally greater than PfHsp70-1, and may serve as a nucleotide exchange factor (NEF) for PfHsp70-1.","method":"Co-immunoaffinity chromatography, surface plasmon resonance, protein aggregation suppression assay","journal":"Cell stress & chaperones","confidence":"High","confidence_rationale":"Tier 1 / Moderate — two orthogonal interaction methods (co-affinity chromatography + SPR) plus in vitro functional assay; single lab but rigorous","pmids":["26894764"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2017,"finding":"Polymyxin B (PMB) directly binds PfHsp70-1 (HSP70/PF3D7_0818900) as shown by SPR, and modulates its secondary and tertiary structure (circular dichroism, tryptophan fluorescence), inhibiting both its basal ATPase activity and chaperone function.","method":"Surface plasmon resonance, circular dichroism spectroscopy, tryptophan fluorescence, ATPase assay, chaperone aggregation suppression assay","journal":"Cell stress & chaperones","confidence":"High","confidence_rationale":"Tier 1 / Moderate — multiple orthogonal biophysical and biochemical methods demonstrating direct binding and functional inhibition; single lab","pmids":["28455613"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2017,"finding":"(-)-Epigallocatechin-3-gallate (EGCG) directly binds PfHsp70-1 (HSP70/PF3D7_0818900) as shown by SPR, induces secondary and tertiary conformational changes, inhibits ATPase and chaperone functions, abrogates its association with functional partners, and inhibits parasite growth (IC50 ~2.9 µM).","method":"Surface plasmon resonance, circular dichroism, ATPase assay, aggregation suppression assay, parasite growth assay","journal":"Molecules (Basel, Switzerland)","confidence":"High","confidence_rationale":"Tier 1 / Moderate — multiple orthogonal biophysical and biochemical methods plus parasite growth assay; single lab","pmids":["29206141"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2020,"finding":"A chemoproteomic approach identified PfHsp70-1 (HSP70/PF3D7_0818900) as a phosphatidylinositol 3-phosphate (PI(3)P)-binding protein. Hsp70 inhibitor treatment and knockdown of PfHsp70-1 phenocopy PI(3)P-deficient parasites under heat shock (destabilization of the digestive vacuole). PfHsp70-1 knockdown hypersensitizes parasites to heat shock and PI3K inhibitors, establishing a mechanistic link between PI(3)P and PfHsp70-1 in digestive vacuole stabilization during thermal stress.","method":"Chemoproteomic pulldown (PI(3)P-binding identification), Hsp70 inhibitor treatment, PfHsp70-1 knockdown, live cell microscopy, pharmacological rescue experiments","journal":"eLife","confidence":"High","confidence_rationale":"Tier 2 / Strong — chemoproteomic identification of PI(3)P binding, genetic knockdown, pharmacological inhibition, and live microscopy phenotyping; multiple orthogonal methods with functional consequence","pmids":["32975513"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2021,"finding":"The transcription factor PfAP2-HS activates transcription of hsp70-1 (PF3D7_0818900) and hsp90 at elevated temperatures. The primary PfAP2-HS binding site in the genome coincides with a tandem G-box DNA motif in the hsp70-1 promoter. Parasites lacking PfAP2-HS have reduced heat-shock survival and increased sensitivity to artemisinin and proteasome inhibitor epoxomicin.","method":"ChIP-seq (PfAP2-HS binding site mapping), engineered knockout parasites, heat-shock survival assay, drug sensitivity assay","journal":"Nature microbiology","confidence":"High","confidence_rationale":"Tier 2 / Strong — ChIP-seq for binding site mapping plus genetic KO with multiple functional readouts (heat survival, drug sensitivity); multiple orthogonal methods","pmids":["34400833"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2024,"finding":"The linker region of PfHsp70-1 (HSP70/PF3D7_0818900) is important for its self-association and client selection. Swapping the linker with that of PfHsp70-z (an Hsp110 homolog) compromises both self-association (measured by SPR) and client binding specificity (measured by co-affinity chromatography coupled to LC-MS).","method":"Surface plasmon resonance, co-affinity chromatography, LC-MS","journal":"Heliyon","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — domain-swap mutagenesis with in vitro functional readouts; single lab, two orthogonal methods","pmids":["38707424"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2025,"finding":"PfHsp70-1 (HSP70/PF3D7_0818900) serves as the chaperone partner for the cochaperone PfYdj1 (PF3D7_1437900/cytosolic type I Hsp40) in folding ribonucleotide reductase small subunit (PfR2). PfR2 interacts specifically with PfYdj1, which then interacts with PfHsp70-1 via its HPD motif. Small molecule 116-9e disrupts the PfYdj1–PfHsp70-1 interaction, destabilizes PfR2, inhibits dNTP production, and causes replication arrest in parasites. Combination of 116-9e with a PfR2 catalytic inhibitor (benzo-hydroxamate) acts synergistically.","method":"Co-immunoprecipitation, small molecule perturbation (116-9e), dNTP quantification, parasite growth and replication assay, synergy assay","journal":"mBio","confidence":"High","confidence_rationale":"Tier 2 / Strong — co-IP establishing interaction, genetic/pharmacological perturbation with specific molecular readout (dNTP levels, PfR2 stability), parasite phenotype, and synergy validation; multiple orthogonal methods","pmids":["40938117"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":"3D7"}]},{"year":2026,"finding":"In P. falciparum, loss of ESCRT protein PfVps60 reduces induction of cytosolic PfHsp70-1 (HSP70/PF3D7_0818900) upon heat shock, alters aggregation dynamics, and results in early loss of parasite viability following heat shock, linking vesicular trafficking to PfHsp70-1-mediated proteostasis during thermal stress.","method":"PfVps60 knockout, proteomic profiling of EV cargo, heat-shock viability assay, protein aggregation analysis","journal":"Emerging microbes & infections","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic KO with proteomics and functional phenotype; single lab; PfHsp70-1 induction reduction is a downstream consequence of vesicular pathway disruption","pmids":["42253101"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":"3D7"}]},{"year":2026,"finding":"Small molecule inhibitors AMK3 and AMK4 bind PfHsp70-1 (HSP70/PF3D7_0818900) with low-micromolar affinity and >25-fold selectivity over human HSPA1A. AMK3 binds the N-terminal nucleotide-binding domain and competes with ATP binding; AMK4 binds the C-terminal substrate-binding domain and disrupts peptide binding. Both exhibit anti-Plasmodium activity.","method":"High-throughput thermal shift screen, microscale thermophoresis, proteomics-based binding region mapping, biochemical competition assay, parasite growth assay","journal":"Antimicrobial agents and chemotherapy","confidence":"High","confidence_rationale":"Tier 1 / Moderate — domain-specific binding mapped by proteomics and biochemical competition with ATP; multiple orthogonal methods; parasite activity confirmed; single lab","pmids":["42390429"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2026,"finding":"Isolated J-domains from multiple exported P. falciparum J-domain proteins stimulate the ATPase activity of PfHsp70-1 (HSP70/PF3D7_0818900) in vitro, demonstrating promiscuous stimulation. Differences in stimulation efficiency were observed between individual PfJDP–PfHsp70-1 pairings.","method":"In vitro ATPase stimulation assay with purified isolated J-domains and recombinant PfHsp70-1","journal":"FEBS open bio","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — in vitro enzymatic reconstitution with purified components; single lab, single method type","pmids":["41618743"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]}],"current_model":"PF3D7_0818900 (PfHsp70-1) is a cytosolic, constitutively expressed and heat-shock-inducible molecular chaperone whose transcription is directly activated by the transcription factor PfAP2-HS binding a G-box motif in its promoter; it possesses ATPase activity whose catalytic cycling is stimulated by Hsp40 cochaperones (including PfYdj1 and PfHsp40) via their HPD/J-domain motifs, is regulated allosterically through nucleotide state and interdomain linker communication, binds phosphatidylinositol 3-phosphate to stabilize the digestive vacuole under heat stress, forms a trimeric complex with PfHop and PfHsp90, interacts with PfHsp70-z as a nucleotide exchange factor, and facilitates folding of client proteins such as ribonucleotide reductase subunit PfR2, making it essential for parasite proteostasis, DNA replication, and survival during febrile episodes."},"narrative":{"mechanistic_narrative":"PF3D7_0818900 (HSP70/PfHsp70-1) is an abundant, soluble cytosolic and nuclear molecular chaperone of P. falciparum expressed across sporozoite, liver, and asexual erythrocytic stages and induced by heat shock, positioning it as a central proteostasis factor during febrile episodes [PMID:3095842, PMID:1779989, PMID:8153120]. Its transcription is directly activated at elevated temperature by the transcription factor PfAP2-HS, which binds a tandem G-box motif in the hsp70-1 promoter; parasites lacking PfAP2-HS show reduced heat-shock survival [PMID:34400833]. Biochemically, recombinant PfHsp70-1 is a largely monomeric ATPase with quantified basal activity, and its chaperone function depends on interdomain communication through the ATPase–substrate-binding-domain linker (residues V401/Q402), on an intact substrate-binding cavity, and on a C-terminal domain that thermally stabilizes the nucleotide-binding domain; the linker also governs self-association and client selection [PMID:14711509, PMID:15973516, PMID:19075824, PMID:19339102, PMID:38707424]. Its ATPase-coupled folding cycle is stimulated by Hsp40/J-domain cochaperones — PfHsp40, Pfj1, Pfj4, and, promiscuously, isolated J-domains from multiple J-domain proteins — with which it cooperatively suppresses protein aggregation, and it associates nucleotide-dependently with the Hsp110 homolog PfHsp70-z acting as a nucleotide exchange factor [PMID:18674634, PMID:19339102, PMID:21191678, PMID:26894764, PMID:41618743]. PfHsp70-1 assembles into a PfHsp90 multichaperone complex and forms a trimeric PfHsp70-1/PfHop/PfHsp90 assembly, with PfHop TPR1/TPR2B subdomains binding the PfHsp70-1 C-terminus in an ADP-favored manner [PMID:12584193, PMID:22005844, PMID:26267894]. Functionally it folds client proteins including the ribonucleotide reductase small subunit PfR2 (delivered via the cochaperone PfYdj1's HPD motif), linking it to dNTP production and DNA replication, and it binds phosphatidylinositol 3-phosphate to stabilize the digestive vacuole under thermal stress [PMID:32975513, PMID:40938117]. The protein is a validated antimalarial target, with multiple small molecules binding its nucleotide-binding or substrate-binding domains to inhibit ATPase/chaperone activity and parasite growth [PMID:28455613, PMID:29206141, PMID:40938117, PMID:42390429].","teleology":[{"year":1986,"claim":"Establishing that P. falciparum encodes an abundant cytoplasmic Hsp70-family polypeptide defined the gene product as a candidate parasite chaperone.","evidence":"cDNA cloning, sequence analysis, and SDS-PAGE of parasite lysates","pmids":["3095842"],"confidence":"Medium","gaps":["No biochemical chaperone or ATPase activity demonstrated yet","Subcellular localization not resolved"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":1991,"claim":"Demonstrating transient, temperature-dependent induction and nuclear localization tied the protein to the parasite heat-shock response.","evidence":"Northern blot, in vitro translation, and immuno-gold electron microscopy","pmids":["1779989"],"confidence":"Medium","gaps":["Mechanism coupling induction to survival not shown","Cytosolic pool not addressed in this study"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":1994,"claim":"Showing expression across sporozoite, liver, and erythrocytic stages established the chaperone as constitutively required through the life cycle rather than a stage-restricted protein.","evidence":"Immunofluorescence, Western blot, and passive antibody transfer","pmids":["8153120"],"confidence":"Medium","gaps":["Antibodies did not neutralize sporozoite infectivity, leaving a protective role unsupported"],"attribution":[{"species":"Plasmodium falciparum","strain":""},{"species":"Plasmodium berghei","strain":""},{"species":"Plasmodium yoelii","strain":""}]},{"year":2003,"claim":"Co-sedimentation with PfHsp90 placed PfHsp70-1 within a defined multichaperone complex, moving it from a solo chaperone to a component of an assembled machine.","evidence":"Sedimentation analysis and size exclusion chromatography","pmids":["12584193"],"confidence":"Medium","gaps":["No reciprocal pulldown","Bridging adaptor not identified at this stage"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2004,"claim":"In vitro reconstitution quantified the intrinsic ATPase activity and monomeric state, establishing the enzymatic basis of the chaperone cycle; pharmacological disruption of the PfHsp90 complex linked it to ring-to-trophozoite progression.","evidence":"Heterologous expression with ATPase kinetics and gel filtration; geldanamycin complex disruption with flow cytometry","pmids":["14711509","15339915"],"confidence":"High","gaps":["Cochaperone stimulation of ATPase not yet measured","Direct clients unknown"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2009,"claim":"Domain dissection and mutagenesis defined how interdomain communication, the substrate-binding cavity, and the stabilizing C-terminal domain govern chaperone function.","evidence":"E. coli complementation with domain-swap chimeras and mutagenesis (2005), substrate-cavity mutagenesis with homology modeling (2008), and biophysical domain dissection (2009)","pmids":["15973516","19075824","19339102"],"confidence":"High","gaps":["Structural model inferred by homology, not experimental structure","Client repertoire still undefined"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2010,"claim":"Identifying Hsp40/J-domain cochaperones that stimulate ATPase activity and cooperate to suppress aggregation established the functional Hsp70–Hsp40 folding partnership in the parasite.","evidence":"Immunofluorescence co-localization, Hsp40-stimulated ATPase assays, and aggregation-suppression assays with Pfj1, Pfj4, and PfHsp40","pmids":["18674634","19339102","21191678"],"confidence":"High","gaps":["Which J-proteins act on which clients in vivo not resolved"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2015,"claim":"Defining the PfHop-bridged trimeric assembly and its domain/nucleotide dependence provided the molecular basis for coupling PfHsp70-1 to PfHsp90.","evidence":"Co-localization and co-IP/gel filtration (2011); 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sciences","url":"https://pubmed.ncbi.nlm.nih.gov/39596368","citation_count":3,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["HSP70"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":48903,"output_tokens":8777,"usd":0.139182,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":16902,"output_tokens":5713,"usd":0.113668,"stage2_stop_reason":"end_turn"},"total_usd":0.25285,"stage1_batch_id":"msgbatch_01DisAaTypwmC8QwdMBuePHo","stage2_batch_id":"msgbatch_0184zxZTqxiEfdYYfPMfkqjb","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1986,\n      \"finding\": \"PF3D7_0818900 (HSP70/PfHsp70-1) encodes an abundant, soluble cytoplasmic polypeptide of ~75 kDa present in all asexual blood stages and gametocytes, containing tandemly repeated Gly-Gly-Met-Pro sequences, and is 70% homologous at the amino acid level to Drosophila hsp70.\",\n      \"method\": \"cDNA cloning, nucleotide sequence analysis, SDS-PAGE of parasite lysates\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — original cloning and characterization of the protein by sequence analysis and biochemical fractionation; single lab but foundational identification\",\n      \"pmids\": [\"3095842\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 1991,\n      \"finding\": \"HSP70 (PfHsp70-1/Pfhsp) is induced by heat shock (temperature elevation from 26°C to 37°C and higher) in a transient, temperature-dependent manner; mRNA levels increase in parallel with protein synthesis. Immuno-gold electron microscopy localized Pfhsp to the nucleus of the parasite.\",\n      \"method\": \"Northern blot, in vitro translation, immuno-gold electron microscopy, metabolic labeling\",\n      \"journal\": \"Molecular and biochemical parasitology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods (Northern blot, in vitro translation, immuno-gold EM) in a single study establishing heat-shock induction and nuclear localization\",\n      \"pmids\": [\"1779989\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 1992,\n      \"finding\": \"Expression of HSP70 (PfHsp70-1/PFHSP70-I) gene is enhanced after heat shock, and parasites remain viable after heat shock but show altered growth, suggesting HSP70 overexpression contributes to parasite survival during fever.\",\n      \"method\": \"Parasite viability assay, growth assay, heat-shock protein expression analysis\",\n      \"journal\": \"FEBS letters\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single lab, single method set, indirect mechanistic inference\",\n      \"pmids\": [\"1385215\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 1994,\n      \"finding\": \"HSP70 (PfHsp70-1) protein is expressed in sporozoites, liver stages, and erythrocytic forms of malaria parasites, as demonstrated by monoclonal antibodies reacting with a recombinant protein encoding the carboxyl terminal half (aa 365–681). Passive transfer of these antibodies failed to neutralize sporozoite infectivity.\",\n      \"method\": \"Immunofluorescence, Western blot, passive transfer experiments with monoclonal antibodies\",\n      \"journal\": \"Parasitology research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — two orthogonal detection methods (IFA and Western blot) demonstrating stage-specific expression; negative passive transfer result recorded explicitly\",\n      \"pmids\": [\"8153120\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}, {\"species\": \"Plasmodium berghei\", \"strain\": \"\"}, {\"species\": \"Plasmodium yoelii\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"HSP70 (HSC70 ortholog) from Plasmodium knowlesi merozoites binds F-actin and forms a complex with 32/34-kDa proteins; this HSC70/32/34-kDa complex inhibits actin polymerization in vitro in a calcium-independent manner abrogated by phosphatidylinositol 4,5-bisphosphate, consistent with a barbed-end capping activity.\",\n      \"method\": \"F-actin affinity chromatography, ATP-agarose binding, tryptic peptide microsequencing, Western blot, gel filtration chromatography, in vitro actin polymerization assay\",\n      \"journal\": \"Molecular and biochemical parasitology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal biochemical methods (affinity chromatography, gel filtration, in vitro functional assay) in a single study; attributed to P. knowlesi ortholog\",\n      \"pmids\": [\"9662713\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium knowlesi\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"In P. falciparum-infected erythrocytes, host-cell Hsp70 (human, not parasite-encoded) is recruited into membrane-bound, detergent-resistant complexes in an ATP-dependent manner, and can be cross-linked to the knob subunit PfHRP1 at the erythrocyte surface, implicating host Hsp70 in knob assembly. No parasite-encoded HSP70 was detected in the erythrocyte cytoplasm at this time.\",\n      \"method\": \"Hypotonic lysis, detergent solubilization, sedimentation analysis, chemical cross-linking, co-immunoprecipitation\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal biochemical methods in one study; this paper establishes that the Hsp70 acting in the erythrocyte cytoplasm at this time point is host-derived, not PF3D7_0818900 itself\",\n      \"pmids\": [\"11711553\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Putative HSP70 (DnaK) binding sites present in apicoplast transit peptides are important for correct apicoplast targeting in vivo; site-directed mutagenesis of these sites disrupted organellar targeting.\",\n      \"method\": \"Site-directed mutagenesis, in vivo organellar targeting assay\",\n      \"journal\": \"Science (New York, N.Y.)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — site-directed mutagenesis with in vivo functional readout; single lab, functional consequence directly measured\",\n      \"pmids\": [\"12560551\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"PfHsp70 (HSP70/PF3D7_0818900) co-sediments with PfHsp90 in ~300 kDa, ~11S complexes, demonstrating it is a component of the PfHsp90 multi-chaperone complex in the parasite.\",\n      \"method\": \"Sedimentation analysis, size exclusion chromatography\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — co-sedimentation and gel filtration showing complex membership; two orthogonal methods but no reciprocal pulldown\",\n      \"pmids\": [\"12584193\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Recombinant PfHsp70-1 (HSP70/PF3D7_0818900) was overproduced in E. coli and biochemically characterized: it exhibits basal ATPase activity with Vmax = 14.6 nmol/min/mg, Km = 616.5 µM, kcat = 1.03 min⁻¹, and exists largely as a monomer in solution.\",\n      \"method\": \"Heterologous overexpression in E. coli, nickel-chelating affinity chromatography, ATPase activity assay, gel filtration\",\n      \"journal\": \"Protein expression and purification\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro biochemical reconstitution with quantitative enzymatic characterization; multiple orthogonal methods in one study\",\n      \"pmids\": [\"14711509\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Geldanamycin disrupts the PfHsp90 multi-chaperone complex that contains PfHsp70 (HSP70/PF3D7_0818900), PfPP5, and tubulin, and inhibits parasite progression from ring to trophozoite stage; repeated heat exposure (mimicking fever) promotes parasite development through this complex.\",\n      \"method\": \"Geldanamycin treatment, flow cytometry, complex disruption assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — pharmacological disruption with defined cellular phenotype; complex membership confirmed by prior sedimentation data; single lab\",\n      \"pmids\": [\"15339915\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"PfHsp70-1 (HSP70/PF3D7_0818900) functionally complements an E. coli dnaK756 mutant (thermosensitive) but not the dnaK deletion or truncation mutant. Two key amino acid residues (V401 and Q402) in the linker region between the ATPase domain and substrate-binding domain are essential for in vivo chaperone function. The substrate-binding domain of PfHsp70, when fused to the E. coli DnaK ATPase domain, retained complementation activity, demonstrating that interdomain communication is critical.\",\n      \"method\": \"In vivo complementation assay in E. coli, domain-swap chimera construction, site-directed mutagenesis\",\n      \"journal\": \"Molecular genetics and genomics : MGG\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — reconstitution-level in vivo functional assay with mutagenesis and domain swaps; multiple rigorous controls in one study\",\n      \"pmids\": [\"15973516\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"15-deoxyspergualin (DSG) binds PfHsp70-1 (HSP70/PF3D7_0818900, which carries a C-terminal EEVD motif) and further stimulates its ATP-enhanced chaperone activity, but has no effect on PfHsp70-2 (which lacks EEVD). Substrate binding to PfHsp70-1 is unaffected by DSG, suggesting DSG acts via the EEVD motif to modulate ATPase-coupled chaperone cycling.\",\n      \"method\": \"Cloning, overexpression, chaperone activity assay, binding assay in presence/absence of DSG and ATP\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vitro biochemical assays comparing two Hsp70 isoforms; single lab, functional mechanistic distinction established\",\n      \"pmids\": [\"16884692\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"15-deoxyspergualin causes Hsp70 (HSP70/PF3D7_0818900) sequestration, leading to phosphorylation of eIF2α and stalling of protein synthesis in P. falciparum, though this requires high micromolar concentrations. At lower concentrations, DSG primarily targets trafficking of nucleus-encoded proteins to the apicoplast.\",\n      \"method\": \"Metabolic labeling, eIF2α phosphorylation assay, protein trafficking assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple in-cell biochemical assays; single lab; mechanistic distinction between high and low concentration effects established\",\n      \"pmids\": [\"17194705\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"PfHsp70-1 (HSP70/PF3D7_0818900) displays chaperone activity in vitro; amino acid substitutions introduced in the substrate-binding cavity compromise its chaperone function. Three-dimensional homology modeling was used to map domain spatial orientation.\",\n      \"method\": \"3D homology modeling, site-directed mutagenesis, in vitro chaperone activity assay\",\n      \"journal\": \"Protein and peptide letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — mutagenesis of substrate-binding cavity with functional in vitro readout; single lab\",\n      \"pmids\": [\"19075824\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"PfHsp70-1 (HSP70/PF3D7_0818900) and Pfj4 (a type II Hsp40) co-localize to the nucleus and cytoplasm of the parasite, and immunoprecipitation studies and size exclusion chromatography indicate that they directly or indirectly interact.\",\n      \"method\": \"Immunofluorescence, immuno-electron microscopy, immunoprecipitation, size exclusion chromatography, Western blot\",\n      \"journal\": \"The international journal of biochemistry & cell biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — co-localization and co-IP showing interaction; multiple methods but interaction directness not fully resolved\",\n      \"pmids\": [\"18674634\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"PfHsp70-1 (HSP70/PF3D7_0818900) has chaperone activity that is enhanced by Pfj1 (PFD0465w, the DnaJ homolog), representing the first evidence for a functional Pfj1–PfHsp70-1 interaction. The C-terminal domain of PfHsp70-1 confers thermal stability to the N-terminal nucleotide-binding domain and functions as a stabilization domain.\",\n      \"method\": \"Fluorescence spectroscopy, circular dichroism, in vitro chaperone activity assay, domain deletion analysis\",\n      \"journal\": \"Biophysical chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro reconstitution with multiple orthogonal biophysical methods and domain dissection; single lab\",\n      \"pmids\": [\"19339102\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Pyrimidinone-amide compounds alter the ATPase activity of purified PfHsp70-1 (HSP70/PF3D7_0818900) in single-turnover assays and inhibit P. falciparum replication, demonstrating that PfHsp70-1 ATPase activity can be pharmacologically modulated.\",\n      \"method\": \"Single-turnover ATPase assay with purified recombinant PfHsp70, parasite growth inhibition assay\",\n      \"journal\": \"Bioorganic & medicinal chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro enzymatic assay combined with parasite growth assay; single lab\",\n      \"pmids\": [\"19195901\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"PfHsp70-1 (HSP70/PF3D7_0818900) and PfHsp40 co-localize mainly in the parasite cytosol; recombinant PfHsp40 stimulates the ATPase activity of PfHsp70-1 similarly to canonical Hsp40s. PfHsp40 cooperates with PfHsp70-1 to suppress protein aggregation in vitro. Pyrimidinone-based small molecules differentially inhibit the Hsp40-stimulated ATPase activities of plasmodial versus human Hsp70.\",\n      \"method\": \"Indirect immunofluorescence microscopy, ATPase activity assay (Hsp40-stimulated), protein aggregation suppression assay, pharmacological inhibition\",\n      \"journal\": \"Cell stress & chaperones\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — multiple orthogonal methods (localization, enzymatic assay, aggregation assay, pharmacology); findings replicated across Hsp70 variants; single lab but rigorous\",\n      \"pmids\": [\"21191678\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"PfHop (PfHsp70-Hsp90 organising protein) co-localizes with PfHsp70-1 (HSP70/PF3D7_0818900) and PfHsp90 at the trophozoite stage, and co-immunoprecipitation and gel filtration confirm they form a trimeric complex, suggesting PfHop mediates functional interaction between PfHsp70-1 and PfHsp90.\",\n      \"method\": \"Co-immunoprecipitation, gel filtration chromatography, immunofluorescence co-localization\",\n      \"journal\": \"Cell stress & chaperones\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal approaches (co-IP + gel filtration + co-localization) in single lab; single study\",\n      \"pmids\": [\"22005844\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Purified recombinant PfHsp70-1 (HSP70/PF3D7_0818900) chaperone activity (protein aggregation suppression) is inhibited in a concentration-dependent manner by malonganenones A–C, lapachol and bromo-β-lapachona; most of these compounds also inhibit parasite growth.\",\n      \"method\": \"Malate dehydrogenase-based aggregation suppression assay, parasite growth inhibition assay\",\n      \"journal\": \"Biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro reconstituted chaperone assay with purified recombinant protein, combined with parasite growth assay; single lab\",\n      \"pmids\": [\"21426241\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"PfHop interacts directly with PfHsp70-1 (HSP70/PF3D7_0818900) in a nucleotide-dependent fashion; ADP promotes the association more than ATP. The TPR1 and TPR2B subdomains of PfHop preferentially bind the C-terminus of PfHsp70-1, while TPR2A preferentially binds PfHsp90 C-terminus, defining the molecular basis for assembly of the PfHsp70-1/PfHop/PfHsp90 complex.\",\n      \"method\": \"Far Western blot, surface plasmon resonance (SPR), co-immunoprecipitation, split-GFP domain interaction assay\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — multiple orthogonal interaction methods (far Western, SPR, co-IP, split-GFP); ADP/ATP-dependent interaction and domain specificity defined in single study\",\n      \"pmids\": [\"26267894\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"PfHsp70-z (an Hsp110 homolog) associates with PfHsp70-1 (HSP70/PF3D7_0818900) in a nucleotide-dependent fashion as shown by co-immunoaffinity chromatography and surface plasmon resonance. PfHsp70-z possesses independent chaperone activity (protein aggregation suppression) marginally greater than PfHsp70-1, and may serve as a nucleotide exchange factor (NEF) for PfHsp70-1.\",\n      \"method\": \"Co-immunoaffinity chromatography, surface plasmon resonance, protein aggregation suppression assay\",\n      \"journal\": \"Cell stress & chaperones\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — two orthogonal interaction methods (co-affinity chromatography + SPR) plus in vitro functional assay; single lab but rigorous\",\n      \"pmids\": [\"26894764\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Polymyxin B (PMB) directly binds PfHsp70-1 (HSP70/PF3D7_0818900) as shown by SPR, and modulates its secondary and tertiary structure (circular dichroism, tryptophan fluorescence), inhibiting both its basal ATPase activity and chaperone function.\",\n      \"method\": \"Surface plasmon resonance, circular dichroism spectroscopy, tryptophan fluorescence, ATPase assay, chaperone aggregation suppression assay\",\n      \"journal\": \"Cell stress & chaperones\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — multiple orthogonal biophysical and biochemical methods demonstrating direct binding and functional inhibition; single lab\",\n      \"pmids\": [\"28455613\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"(-)-Epigallocatechin-3-gallate (EGCG) directly binds PfHsp70-1 (HSP70/PF3D7_0818900) as shown by SPR, induces secondary and tertiary conformational changes, inhibits ATPase and chaperone functions, abrogates its association with functional partners, and inhibits parasite growth (IC50 ~2.9 µM).\",\n      \"method\": \"Surface plasmon resonance, circular dichroism, ATPase assay, aggregation suppression assay, parasite growth assay\",\n      \"journal\": \"Molecules (Basel, Switzerland)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — multiple orthogonal biophysical and biochemical methods plus parasite growth assay; single lab\",\n      \"pmids\": [\"29206141\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"A chemoproteomic approach identified PfHsp70-1 (HSP70/PF3D7_0818900) as a phosphatidylinositol 3-phosphate (PI(3)P)-binding protein. Hsp70 inhibitor treatment and knockdown of PfHsp70-1 phenocopy PI(3)P-deficient parasites under heat shock (destabilization of the digestive vacuole). PfHsp70-1 knockdown hypersensitizes parasites to heat shock and PI3K inhibitors, establishing a mechanistic link between PI(3)P and PfHsp70-1 in digestive vacuole stabilization during thermal stress.\",\n      \"method\": \"Chemoproteomic pulldown (PI(3)P-binding identification), Hsp70 inhibitor treatment, PfHsp70-1 knockdown, live cell microscopy, pharmacological rescue experiments\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — chemoproteomic identification of PI(3)P binding, genetic knockdown, pharmacological inhibition, and live microscopy phenotyping; multiple orthogonal methods with functional consequence\",\n      \"pmids\": [\"32975513\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"The transcription factor PfAP2-HS activates transcription of hsp70-1 (PF3D7_0818900) and hsp90 at elevated temperatures. The primary PfAP2-HS binding site in the genome coincides with a tandem G-box DNA motif in the hsp70-1 promoter. Parasites lacking PfAP2-HS have reduced heat-shock survival and increased sensitivity to artemisinin and proteasome inhibitor epoxomicin.\",\n      \"method\": \"ChIP-seq (PfAP2-HS binding site mapping), engineered knockout parasites, heat-shock survival assay, drug sensitivity assay\",\n      \"journal\": \"Nature microbiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — ChIP-seq for binding site mapping plus genetic KO with multiple functional readouts (heat survival, drug sensitivity); multiple orthogonal methods\",\n      \"pmids\": [\"34400833\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"The linker region of PfHsp70-1 (HSP70/PF3D7_0818900) is important for its self-association and client selection. Swapping the linker with that of PfHsp70-z (an Hsp110 homolog) compromises both self-association (measured by SPR) and client binding specificity (measured by co-affinity chromatography coupled to LC-MS).\",\n      \"method\": \"Surface plasmon resonance, co-affinity chromatography, LC-MS\",\n      \"journal\": \"Heliyon\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — domain-swap mutagenesis with in vitro functional readouts; single lab, two orthogonal methods\",\n      \"pmids\": [\"38707424\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"PfHsp70-1 (HSP70/PF3D7_0818900) serves as the chaperone partner for the cochaperone PfYdj1 (PF3D7_1437900/cytosolic type I Hsp40) in folding ribonucleotide reductase small subunit (PfR2). PfR2 interacts specifically with PfYdj1, which then interacts with PfHsp70-1 via its HPD motif. Small molecule 116-9e disrupts the PfYdj1–PfHsp70-1 interaction, destabilizes PfR2, inhibits dNTP production, and causes replication arrest in parasites. Combination of 116-9e with a PfR2 catalytic inhibitor (benzo-hydroxamate) acts synergistically.\",\n      \"method\": \"Co-immunoprecipitation, small molecule perturbation (116-9e), dNTP quantification, parasite growth and replication assay, synergy assay\",\n      \"journal\": \"mBio\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — co-IP establishing interaction, genetic/pharmacological perturbation with specific molecular readout (dNTP levels, PfR2 stability), parasite phenotype, and synergy validation; multiple orthogonal methods\",\n      \"pmids\": [\"40938117\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"3D7\"}]\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"In P. falciparum, loss of ESCRT protein PfVps60 reduces induction of cytosolic PfHsp70-1 (HSP70/PF3D7_0818900) upon heat shock, alters aggregation dynamics, and results in early loss of parasite viability following heat shock, linking vesicular trafficking to PfHsp70-1-mediated proteostasis during thermal stress.\",\n      \"method\": \"PfVps60 knockout, proteomic profiling of EV cargo, heat-shock viability assay, protein aggregation analysis\",\n      \"journal\": \"Emerging microbes & infections\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic KO with proteomics and functional phenotype; single lab; PfHsp70-1 induction reduction is a downstream consequence of vesicular pathway disruption\",\n      \"pmids\": [\"42253101\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"3D7\"}]\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"Small molecule inhibitors AMK3 and AMK4 bind PfHsp70-1 (HSP70/PF3D7_0818900) with low-micromolar affinity and >25-fold selectivity over human HSPA1A. AMK3 binds the N-terminal nucleotide-binding domain and competes with ATP binding; AMK4 binds the C-terminal substrate-binding domain and disrupts peptide binding. Both exhibit anti-Plasmodium activity.\",\n      \"method\": \"High-throughput thermal shift screen, microscale thermophoresis, proteomics-based binding region mapping, biochemical competition assay, parasite growth assay\",\n      \"journal\": \"Antimicrobial agents and chemotherapy\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — domain-specific binding mapped by proteomics and biochemical competition with ATP; multiple orthogonal methods; parasite activity confirmed; single lab\",\n      \"pmids\": [\"42390429\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2026,\n      \"finding\": \"Isolated J-domains from multiple exported P. falciparum J-domain proteins stimulate the ATPase activity of PfHsp70-1 (HSP70/PF3D7_0818900) in vitro, demonstrating promiscuous stimulation. Differences in stimulation efficiency were observed between individual PfJDP–PfHsp70-1 pairings.\",\n      \"method\": \"In vitro ATPase stimulation assay with purified isolated J-domains and recombinant PfHsp70-1\",\n      \"journal\": \"FEBS open bio\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro enzymatic reconstitution with purified components; single lab, single method type\",\n      \"pmids\": [\"41618743\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    }\n  ],\n  \"current_model\": \"PF3D7_0818900 (PfHsp70-1) is a cytosolic, constitutively expressed and heat-shock-inducible molecular chaperone whose transcription is directly activated by the transcription factor PfAP2-HS binding a G-box motif in its promoter; it possesses ATPase activity whose catalytic cycling is stimulated by Hsp40 cochaperones (including PfYdj1 and PfHsp40) via their HPD/J-domain motifs, is regulated allosterically through nucleotide state and interdomain linker communication, binds phosphatidylinositol 3-phosphate to stabilize the digestive vacuole under heat stress, forms a trimeric complex with PfHop and PfHsp90, interacts with PfHsp70-z as a nucleotide exchange factor, and facilitates folding of client proteins such as ribonucleotide reductase subunit PfR2, making it essential for parasite proteostasis, DNA replication, and survival during febrile episodes.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"PF3D7_0818900 (HSP70/PfHsp70-1) is an abundant, soluble cytosolic and nuclear molecular chaperone of P. falciparum expressed across sporozoite, liver, and asexual erythrocytic stages and induced by heat shock, positioning it as a central proteostasis factor during febrile episodes [#0, #1, #3]. Its transcription is directly activated at elevated temperature by the transcription factor PfAP2-HS, which binds a tandem G-box motif in the hsp70-1 promoter; parasites lacking PfAP2-HS show reduced heat-shock survival [#25]. Biochemically, recombinant PfHsp70-1 is a largely monomeric ATPase with quantified basal activity, and its chaperone function depends on interdomain communication through the ATPase–substrate-binding-domain linker (residues V401/Q402), on an intact substrate-binding cavity, and on a C-terminal domain that thermally stabilizes the nucleotide-binding domain; the linker also governs self-association and client selection [#8, #10, #13, #15, #26]. Its ATPase-coupled folding cycle is stimulated by Hsp40/J-domain cochaperones — PfHsp40, Pfj1, Pfj4, and, promiscuously, isolated J-domains from multiple J-domain proteins — with which it cooperatively suppresses protein aggregation, and it associates nucleotide-dependently with the Hsp110 homolog PfHsp70-z acting as a nucleotide exchange factor [#14, #15, #17, #21, #30]. PfHsp70-1 assembles into a PfHsp90 multichaperone complex and forms a trimeric PfHsp70-1/PfHop/PfHsp90 assembly, with PfHop TPR1/TPR2B subdomains binding the PfHsp70-1 C-terminus in an ADP-favored manner [#7, #18, #20]. Functionally it folds client proteins including the ribonucleotide reductase small subunit PfR2 (delivered via the cochaperone PfYdj1's HPD motif), linking it to dNTP production and DNA replication, and it binds phosphatidylinositol 3-phosphate to stabilize the digestive vacuole under thermal stress [#24, #27]. The protein is a validated antimalarial target, with multiple small molecules binding its nucleotide-binding or substrate-binding domains to inhibit ATPase/chaperone activity and parasite growth [#22, #23, #27, #29].\",\n  \"teleology\": [\n    {\n      \"year\": 1986,\n      \"claim\": \"Establishing that P. falciparum encodes an abundant cytoplasmic Hsp70-family polypeptide defined the gene product as a candidate parasite chaperone.\",\n      \"evidence\": \"cDNA cloning, sequence analysis, and SDS-PAGE of parasite lysates\",\n      \"pmids\": [\"3095842\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No biochemical chaperone or ATPase activity demonstrated yet\", \"Subcellular localization not resolved\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 1991,\n      \"claim\": \"Demonstrating transient, temperature-dependent induction and nuclear localization tied the protein to the parasite heat-shock response.\",\n      \"evidence\": \"Northern blot, in vitro translation, and immuno-gold electron microscopy\",\n      \"pmids\": [\"1779989\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism coupling induction to survival not shown\", \"Cytosolic pool not addressed in this study\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 1994,\n      \"claim\": \"Showing expression across sporozoite, liver, and erythrocytic stages established the chaperone as constitutively required through the life cycle rather than a stage-restricted protein.\",\n      \"evidence\": \"Immunofluorescence, Western blot, and passive antibody transfer\",\n      \"pmids\": [\"8153120\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Antibodies did not neutralize sporozoite infectivity, leaving a protective role unsupported\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}, {\"species\": \"Plasmodium berghei\", \"strain\": \"\"}, {\"species\": \"Plasmodium yoelii\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Co-sedimentation with PfHsp90 placed PfHsp70-1 within a defined multichaperone complex, moving it from a solo chaperone to a component of an assembled machine.\",\n      \"evidence\": \"Sedimentation analysis and size exclusion chromatography\",\n      \"pmids\": [\"12584193\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No reciprocal pulldown\", \"Bridging adaptor not identified at this stage\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"In vitro reconstitution quantified the intrinsic ATPase activity and monomeric state, establishing the enzymatic basis of the chaperone cycle; pharmacological disruption of the PfHsp90 complex linked it to ring-to-trophozoite progression.\",\n      \"evidence\": \"Heterologous expression with ATPase kinetics and gel filtration; geldanamycin complex disruption with flow cytometry\",\n      \"pmids\": [\"14711509\", \"15339915\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Cochaperone stimulation of ATPase not yet measured\", \"Direct clients unknown\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Domain dissection and mutagenesis defined how interdomain communication, the substrate-binding cavity, and the stabilizing C-terminal domain govern chaperone function.\",\n      \"evidence\": \"E. coli complementation with domain-swap chimeras and mutagenesis (2005), substrate-cavity mutagenesis with homology modeling (2008), and biophysical domain dissection (2009)\",\n      \"pmids\": [\"15973516\", \"19075824\", \"19339102\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural model inferred by homology, not experimental structure\", \"Client repertoire still undefined\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Identifying Hsp40/J-domain cochaperones that stimulate ATPase activity and cooperate to suppress aggregation established the functional Hsp70–Hsp40 folding partnership in the parasite.\",\n      \"evidence\": \"Immunofluorescence co-localization, Hsp40-stimulated ATPase assays, and aggregation-suppression assays with Pfj1, Pfj4, and PfHsp40\",\n      \"pmids\": [\"18674634\", \"19339102\", \"21191678\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Which J-proteins act on which clients in vivo not resolved\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Defining the PfHop-bridged trimeric assembly and its domain/nucleotide dependence provided the molecular basis for coupling PfHsp70-1 to PfHsp90.\",\n      \"evidence\": \"Co-localization and co-IP/gel filtration (2011); far Western, SPR, and split-GFP mapping of TPR subdomain interactions (2015)\",\n      \"pmids\": [\"22005844\", \"26267894\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Client hand-off through the trimeric complex not directly demonstrated\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Identifying PfHsp70-z as a nucleotide-dependent partner and candidate nucleotide exchange factor completed the core cochaperone cycle regulating PfHsp70-1.\",\n      \"evidence\": \"Co-immunoaffinity chromatography, SPR, and aggregation-suppression assays\",\n      \"pmids\": [\"26894764\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"NEF activity inferred, not kinetically demonstrated on PfHsp70-1\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Discovery of PI(3)P binding and its requirement for digestive vacuole stability under heat shock revealed a non-canonical, lipid-linked role for the chaperone in thermal stress protection.\",\n      \"evidence\": \"Chemoproteomic PI(3)P pulldown, knockdown, inhibitor treatment, and live-cell microscopy\",\n      \"pmids\": [\"32975513\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of lipid binding unknown\", \"Relationship between lipid binding and chaperone cycle unresolved\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Mapping direct PfAP2-HS binding to a G-box motif in the hsp70-1 promoter identified the transcriptional switch driving heat-shock induction and drug tolerance.\",\n      \"evidence\": \"ChIP-seq, knockout parasites, and heat-shock/drug sensitivity assays\",\n      \"pmids\": [\"34400833\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether HSP70 induction alone accounts for the survival phenotype not isolated\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Defining the PfYdj1–PfHsp70-1 axis in folding ribonucleotide reductase subunit PfR2 connected the chaperone directly to dNTP production and DNA replication, and validated the cochaperone interface as a druggable node.\",\n      \"evidence\": \"Co-IP, HPD-motif mapping, small-molecule (116-9e) disruption, dNTP quantification, and synergy assays\",\n      \"pmids\": [\"40938117\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Full client spectrum beyond PfR2 not defined\", \"Linker-based client selection (2024) not yet integrated with in vivo client set\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"3D7\"}]\n    },\n    {\n      \"year\": 2026,\n      \"claim\": \"Domain-specific small molecules and promiscuous J-domain stimulation refined the mechanistic and druggability picture, while ESCRT linkage tied vesicular trafficking to PfHsp70-1-dependent proteostasis under heat stress.\",\n      \"evidence\": \"Thermal shift/MST/competition assays for AMK3/AMK4 domain binding; in vitro J-domain ATPase stimulation; PfVps60 knockout with proteomics and heat-shock viability\",\n      \"pmids\": [\"42390429\", \"41618743\", \"42253101\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"ESCRT effect on HSP70 induction is downstream/indirect\", \"Physiological hierarchy among promiscuous J-domain partners unresolved\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}, {\"species\": \"Plasmodium falciparum\", \"strain\": \"3D7\"}]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The full in vivo client repertoire of PfHsp70-1 and an experimental high-resolution structure of the parasite chaperone in its cochaperone-bound states remain undefined.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No experimental atomic structure captured in the corpus\", \"Comprehensive in-cell client and interactome map incomplete\", \"Genetic essentiality tested largely by knockdown/pharmacology rather than clean knockout\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0005524\", \"supporting_discovery_ids\": [8, 10, 29]},\n      {\"term_id\": \"GO:0016887\", \"supporting_discovery_ids\": [8, 16, 22]},\n      {\"term_id\": \"GO:0051082\", \"supporting_discovery_ids\": [13, 15, 17, 19]},\n      {\"term_id\": \"GO:0051087\", \"supporting_discovery_ids\": [14, 17, 20, 21, 30]},\n      {\"term_id\": \"GO:0032266\", \"supporting_discovery_ids\": [24]},\n      {\"term_id\": \"GO:0140662\", \"supporting_discovery_ids\": [21]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005829\", \"supporting_discovery_ids\": [0, 17, 14]},\n      {\"term_id\": \"GO:0005634\", \"supporting_discovery_ids\": [1, 14]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"GO:0034605\", \"supporting_discovery_ids\": [1, 2, 24, 25, 28]},\n      {\"term_id\": \"GO:0006457\", \"supporting_discovery_ids\": [15, 17, 27]},\n      {\"term_id\": \"GO:0006260\", \"supporting_discovery_ids\": [27]},\n      {\"term_id\": \"GO:0009263\", \"supporting_discovery_ids\": [27]}\n    ],\n    \"complexes\": [\n      \"PfHsp70-1/PfHop/PfHsp90 trimeric complex [#18, #20]\",\n      \"PfHsp90 multichaperone complex (~300 kDa / ~11S, containing PfHsp70-1, PfPP5, tubulin) [#7, #9]\"\n    ],\n    \"partners\": [\n      \"PfHsp90 [#7, #18, #20]\",\n      \"PfHop (Hsp70-Hsp90 organizing protein) [#18, #20]\",\n      \"PfHsp70-z (Hsp110 homolog, nucleotide exchange factor) [#21, #26]\",\n      \"PfHsp40 [#17]\",\n      \"Pfj1 (DnaJ homolog, PFD0465w) [#15]\",\n      \"Pfj4 (type II Hsp40) [#14]\",\n      \"PfYdj1 (PF3D7_1437900, cytosolic type I Hsp40) [#27]\",\n      \"Exported P. falciparum J-domain proteins (isolated J-domains) [#30]\",\n      \"PfR2 (ribonucleotide reductase small subunit, client) [#27]\"\n    ],\n    \"other_free_text\": [\n      \"Transcriptionally activated by PfAP2-HS binding a tandem G-box motif in the hsp70-1 promoter under heat shock [#25]\",\n      \"Binds phosphatidylinositol 3-phosphate (PI(3)P); required for digestive vacuole stability under thermal stress [#24]\",\n      \"Interdomain linker residues V401/Q402 and the ATPase-SBD linker are essential for chaperone function, self-association, and client selection [#10, #26]\",\n      \"C-terminal domain thermally stabilizes the N-terminal nucleotide-binding domain; C-terminal EEVD motif mediates DSG modulation [#11, #15]\",\n      \"Validated antimalarial target: bound and inhibited by 15-deoxyspergualin, pyrimidinone-amides, malonganenones/lapachol derivatives, polymyxin B, EGCG, 116-9e (PfYdj1 interface), and domain-specific AMK3 (NBD/ATP-competitive) and AMK4 (SBD/peptide-competitive) [#11, #16, #19, #22, #23, #27, #29]\",\n      \"Distinct from host human Hsp70 recruited to the infected erythrocyte for knob assembly, which is not parasite-encoded [#5]\",\n      \"P. knowlesi HSC70 ortholog binds F-actin and caps barbed ends; species-attributed to P. knowlesi and not directly to PF3D7_0818900 [#4]\"\n    ]\n  }\n}","audit_flag":null,"strains":[{"strain":"Pf3D7","gene_id":"PF3D7_0818900","name":null,"product":"heat shock protein 70","uniprot_acc":null,"chromosome":null,"start_pos":null},{"strain":"PbANKA","gene_id":"PBANKA_0711900","name":null,"product":"heat shock protein 70","uniprot_acc":null,"chromosome":null,"start_pos":null},{"strain":"PkH","gene_id":"PKNH_1312700","name":null,"product":"heat shock protein 70, putative","uniprot_acc":null,"chromosome":null,"start_pos":null}],"gene_symbol":"HSP70","evaluation":null}