{"gene":"PF3D7_0918000","run_date":"2026-09-08T15:29:12+00:00","timeline":{"discoveries":[{"year":2012,"finding":"Crystal structure of P. falciparum GAP50 (PF3D7_0918000) was solved at 1.7 Å resolution, revealing an αββα fold with overall similarity to purple acid phosphatases but with a fundamentally different active-site region; the structure showed two cobalt ions each with only one protein ligand and 18 Å apart (vs. 3.2 Å in purple acid phosphatases), indicating GAP50 is not a functional phosphatase. The C-terminal transmembrane helix anchors GAP50 into the inner membrane complex (IMC), and a short six-residue C-terminal tail interacts with other glideosome proteins.","method":"X-ray crystallography (1.7 Å resolution crystal structure of the soluble domain of PfGAP50)","journal":"Journal of structural biology","confidence":"High","confidence_rationale":"Tier 1 / Moderate — high-resolution crystal structure with structural validation and mechanistic interpretation of active-site residues, single lab but definitive structural method","pmids":["22387043"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2006,"finding":"P. falciparum GAP50 (PF3D7_0918000) was identified as an integral membrane protein of the IMC that forms a glideosome complex with PfGAP45, PfMyoA, and PfMTIP in late schizonts and merozoites, supporting erythrocyte invasion. The complex was detected by co-immunoprecipitation from late-schizont/merozoite lysates.","method":"Co-immunoprecipitation from P. falciparum blood-stage parasites; immunofluorescence assay for localization","journal":"Molecular and biochemical parasitology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reciprocal Co-IP establishing complex membership with localization, single lab, two orthogonal methods","pmids":["16513191"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2010,"finding":"GAP50 (PF3D7_0918000) is a core component of the Toxoplasma/Plasmodium glideosome; in Toxoplasma, functional dissection showed GAP50 is a polytopic IMC-anchored protein and forms a complex with GAP45, MyoA, and MLC1. The orthologous P. falciparum GAP45 can functionally substitute in T. gondii (transgenera complementation), supporting conserved complex architecture across the phylum.","method":"Genetic complementation across genera; co-immunoprecipitation; immunofluorescence; conditional knockdown","journal":"Cell host & microbe","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic complementation and co-IP across species, primary experiments in T. gondii with inference to P. falciparum GAP50 complex membership","pmids":["20951968"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2011,"finding":"PfGAP50-GFP (PF3D7_0918000) localizes to the endoplasmic reticulum in early-stage parasites and then redistributes to apical caps during daughter merozoite formation, extending around the merozoite surface in final schizogony. The C-terminal membrane anchor is required for correct trafficking: a construct lacking this anchor is misdirected to the parasitophorous vacuole. Full-length PfGAP50-GFP forms a complex with endogenous PfGAP45 and MTIP as shown by immunoprecipitation and FRAP.","method":"Live fluorescence imaging of GFP-tagged PfGAP50; FRAP; immunoprecipitation; 3D structured illumination microscopy; domain-deletion transfection","journal":"Eukaryotic cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (live imaging, FRAP, IP, super-resolution microscopy, deletion mutants) in a single focused study on this protein","pmids":["21239623"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2007,"finding":"PfGAP50 (PF3D7_0918000) was identified as part of a high-molecular-weight detergent-resistant membrane (DRM) complex together with GAP45 and myosin A in P. falciparum schizonts, isolated by blue native-PAGE and identified by mass spectrometry.","method":"Detergent-resistant membrane purification; blue native-PAGE; mass spectrometry","journal":"Molecular and biochemical parasitology","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — mass spectrometry identification of complex in DRMs, single lab, single method for this specific protein","pmids":["17553576"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2013,"finding":"PfGAP50 (PF3D7_0918000) on the surface of emerging P. falciparum gametes binds human complement regulator factor H (FH) and uses surface-bound FH to inactivate complement protein C3b, protecting parasites from complement-mediated lysis in the mosquito midgut. Neutralization of FH or blockade of PfGAP50 significantly impaired gametogenesis and parasite transmission.","method":"Binding assays (FH to gamete surface/PfGAP50); complement lysis assays; antibody blockade; gametogenesis inhibition assay","journal":"Cell host & microbe","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct binding and functional blockade experiments with two orthogonal readouts (C3b inactivation, gametogenesis inhibition), single lab","pmids":["23332154"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2005,"finding":"Homologues of glideosome-associated proteins including GAP50 (PF3D7_0918000) are present in P. falciparum merozoites and appear to function in erythrocyte invasion; MTRAP, a merozoite TRAP homologue identified in the same study, binds aldolase in vitro, linking the extracellular adhesin to the actin-myosin motor that includes GAP50.","method":"Immunofluorescence; in vitro aldolase-binding assay; bioinformatic genome analysis","journal":"The Journal of biological chemistry","confidence":"Low","confidence_rationale":"Tier 3 / Weak — localization by immunofluorescence only for GAP50 itself; the mechanistic aldolase-binding result is for MTRAP, not GAP50 directly","pmids":["16321976"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2017,"finding":"GAP50 (PF3D7_0918000) was identified by co-immunoprecipitation as a binding partner of PhIL1, a novel IMC-associated protein in both P. falciparum and P. berghei; this interaction places GAP50 in a PhIL1-containing protein complex overlapping with, but distinct from, the canonical glideosome.","method":"Co-immunoprecipitation / protein interactome (PhIL1 pulldown followed by mass spectrometry)","journal":"Scientific reports","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single pulldown/MS identification, no reciprocal IP or functional validation specifically for GAP50's role in this complex","pmids":["29138437"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""},{"species":"Plasmodium berghei","strain":""}]},{"year":2017,"finding":"GAP50 (PF3D7_0918000) remains a component of the glideosome complex (together with GAP40, an additional essential light chain ELC, MyoA, MTIP, and other candidate proteins) throughout the P. berghei life cycle in extracellular stages (ookinetes, sporozoites, merozoites); co-expression of MyoA with both light chains (MTIP and ELC) enhances MyoA-dependent actin motility in vitro.","method":"Immunofluorescence across life cycle stages; in vitro actin motility assay; co-immunoprecipitation/mass spectrometry of glideosome complex","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods (IFA across stages, in vitro motility, Co-IP/MS), single lab; GAP50's own contribution to motility not directly tested, but complex membership confirmed","pmids":["28893907"],"is_preprint":false,"attribution":[{"species":"Plasmodium berghei","strain":""}]},{"year":2023,"finding":"PfGAP50 (PF3D7_0918000) co-precipitates with PfGAP45 and PfGAP40, and PfGAP40 knockdown reduces steady-state expression levels of both PfGAP45 and PfGAP50 in schizonts, indicating that GAP40 stabilizes GAP50 protein levels within the glideosome complex.","method":"Conditional knockdown (TetR-DOZI) of PfGAP40; co-immunoprecipitation; Western blot quantification of GAP50 levels","journal":"Microbiology spectrum","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — conditional KD with direct protein-level readout of GAP50 stability and Co-IP confirming physical interaction, single lab","pmids":["37249423"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2015,"finding":"Antibodies raised against recombinant PfGAP50 (PF3D7_0918000) inhibited zygote formation by up to 55% in an in vitro zygote inhibition assay, demonstrating that GAP50-specific antibodies can block parasite transmission at the gamete/zygote stage.","method":"In vitro zygote inhibition assay with anti-PfGAP50 rabbit IgG; immunofluorescence assay confirming antibody specificity","journal":"BMC biotechnology","confidence":"Low","confidence_rationale":"Tier 3 / Weak — functional inhibition assay with polyclonal antibodies, single lab, no mechanistic dissection of which epitope/domain mediates the effect","pmids":["26625934"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]}],"current_model":"PfGAP50 (PF3D7_0918000) is an integral IMC membrane protein anchored via its C-terminal transmembrane helix that serves as the structural anchor of the glideosome motor complex — physically associating with GAP45, MyoA, and MTIP — and whose correct trafficking from the ER to apical caps requires the C-terminal membrane anchor; structurally it adopts an αββα acid phosphatase-like fold but lacks phosphatase activity; on the gamete surface it binds human complement factor H to protect parasites from complement-mediated lysis in the mosquito midgut; and its protein levels are stabilized within the complex by GAP40."},"narrative":{"mechanistic_narrative":"GAP50 (PF3D7_0918000) is an integral inner membrane complex (IMC) protein of Plasmodium that serves as the membrane anchor of the glideosome, the actin-myosin motor driving host-cell invasion [PMID:16513191, PMID:17553576]. It is anchored into the IMC by a C-terminal transmembrane helix, with a short six-residue C-terminal tail that engages other glideosome components, and physically associates with GAP45, MyoA, and MTIP in late schizonts and merozoites [PMID:16513191, PMID:21239623]. Its soluble domain adopts an αββα fold resembling purple acid phosphatases but with a fundamentally altered active site — two cobalt ions 18 Å apart, each with a single protein ligand — establishing that GAP50 is a structural scaffold and not a functional phosphatase [PMID:22387043]. Correct delivery of GAP50 depends on this C-terminal membrane anchor: the protein first localizes to the ER and redistributes to apical caps during merozoite formation, while anchor-deleted protein is mislocalized to the parasitophorous vacuole [PMID:21239623]. GAP40 stabilizes steady-state GAP50 protein levels within the complex [PMID:37249423]. Beyond its motor-anchoring role, surface-exposed GAP50 on emerging gametes binds human complement factor H to inactivate C3b and protect parasites from complement-mediated lysis in the mosquito midgut, and antibodies against GAP50 impair gametogenesis and zygote formation [PMID:23332154, PMID:26625934]. GAP50's own catalytic or motor-force contribution beyond complex anchoring has not been directly demonstrated in the available corpus.","teleology":[{"year":2005,"claim":"Establishing whether GAP50 is present in invasive merozoites was the first step toward linking it to the invasion motor, before any complex membership was defined.","evidence":"Immunofluorescence localization of glideosome homologues in P. falciparum merozoites, alongside an in vitro aldolase-binding assay for the co-identified adhesin MTRAP","pmids":["16321976"],"confidence":"Low","gaps":["The aldolase-binding result is for MTRAP, not GAP50 directly","No direct interaction partners of GAP50 defined at this stage","Localization by immunofluorescence only"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2006,"claim":"Defining GAP50 as a bona fide member of a motor complex answered whether it physically integrates with the actin-myosin machinery rather than merely co-localizing.","evidence":"Co-immunoprecipitation and immunofluorescence in P. falciparum late-schizont/merozoite lysates identifying a GAP50–GAP45–MyoA–MTIP complex in the IMC","pmids":["16513191"],"confidence":"Medium","gaps":["Which region of GAP50 mediates each interaction not resolved","Direct contribution of GAP50 to motor force not tested","Single-lab Co-IP"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2007,"claim":"Showing GAP50 in a high-molecular-weight detergent-resistant membrane complex established that the assembly is a stable membrane-embedded unit rather than a transient interaction.","evidence":"Detergent-resistant membrane purification, blue native-PAGE, and mass spectrometry of P. falciparum schizonts","pmids":["17553576"],"confidence":"Medium","gaps":["Stoichiometry of the complex unresolved","Single method for this protein","Functional consequence of DRM association untested"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2010,"claim":"Cross-genera dissection tested whether the glideosome architecture is conserved and whether GAP50 anchoring is a shared feature across apicomplexans.","evidence":"Genetic complementation of T. gondii with P. falciparum GAP45, co-IP, immunofluorescence, and conditional knockdown, placing GAP50 as a polytopic IMC-anchored complex component","pmids":["20951968"],"confidence":"Medium","gaps":["Primary functional experiments were in T. gondii, not P. falciparum GAP50","GAP50-specific knockdown phenotype in Plasmodium not shown"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2011,"claim":"Tracking GAP50 trafficking answered how the anchor determines its delivery route to the IMC and confirmed its physical partnership within intact parasites.","evidence":"Live imaging, FRAP, 3D-SIM, immunoprecipitation, and C-terminal anchor-deletion transfection of GFP-tagged PfGAP50","pmids":["21239623"],"confidence":"High","gaps":["Trafficking machinery recognizing the anchor not identified","Signal for ER-to-apical redistribution unknown"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2012,"claim":"Solving the crystal structure resolved whether GAP50's acid-phosphatase-like fold confers catalytic activity or a purely structural role.","evidence":"1.7 Å X-ray crystal structure of the soluble domain revealing an αββα fold with a degenerate, non-catalytic active site (cobalt ions 18 Å apart)","pmids":["22387043"],"confidence":"High","gaps":["Structure of the full-length membrane-anchored protein not determined","Atomic contacts of the C-terminal tail with glideosome partners not resolved"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2013,"claim":"Discovering GAP50 on the gamete surface established a transmission-stage role in complement evasion entirely distinct from its blood-stage motor function.","evidence":"Factor H binding assays to gamete surface/PfGAP50, complement lysis and C3b inactivation assays, antibody blockade, and gametogenesis inhibition in P. falciparum","pmids":["23332154"],"confidence":"Medium","gaps":["How an IMC-anchored protein reaches the gamete surface unexplained","FH-binding region of GAP50 not mapped"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2015,"claim":"Testing anti-GAP50 antibodies asked whether GAP50 is a viable transmission-blocking target at the gamete/zygote stage.","evidence":"In vitro zygote inhibition assay with anti-PfGAP50 rabbit IgG (up to 55% inhibition) plus immunofluorescence confirming specificity","pmids":["26625934"],"confidence":"Low","gaps":["No mechanistic dissection of which epitope/domain mediates inhibition","Polyclonal antibodies only","In vivo transmission blockade not shown"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2017,"claim":"Interactome and life-cycle studies asked whether GAP50 associates only with the canonical glideosome or participates in additional complexes and stages.","evidence":"PhIL1 pulldown/MS in P. falciparum and P. berghei identifying GAP50 in a PhIL1 complex, and IFA/Co-IP/MS plus in vitro actin motility across P. berghei extracellular stages","pmids":["29138437","28893907"],"confidence":"Low","gaps":["PhIL1 association from single pulldown without reciprocal IP or functional validation","GAP50's own contribution to actin motility not directly tested"],"attribution":[{"species":"Plasmodium falciparum","strain":""},{"species":"Plasmodium berghei","strain":""}]},{"year":2023,"claim":"Perturbing GAP40 tested how GAP50 protein levels are maintained within the complex, revealing an interdependence among glideosome components.","evidence":"TetR-DOZI conditional knockdown of PfGAP40 with Co-IP and Western blot quantification showing reduced GAP50 (and GAP45) levels","pmids":["37249423"],"confidence":"Medium","gaps":["Whether GAP40 acts by direct binding or by complex-assembly stabilization unresolved","GAP50 degradation pathway upon GAP40 loss not defined"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":null,"claim":"It remains unknown what specific mechanical or biochemical contribution GAP50 makes to glideosome force generation beyond serving as the membrane anchor, and how the same protein is dually deployed as an IMC scaffold and a surface complement-evasion factor.","evidence":"","pmids":[],"confidence":"Low","gaps":["No direct GAP50 loss-of-function motor phenotype in Plasmodium","Trafficking route to the gamete surface unexplained","No structure of the intact membrane-anchored complex"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]}],"mechanism_profile":{"molecular_activity":[],"localization":[],"pathway":[],"complexes":["Glideosome motor complex (GAP50–GAP45–MyoA–MTIP)","GAP40-containing glideosome complex","PhIL1-associated IMC complex"],"partners":["GAP45","MYOA (MYOSIN A)","MTIP","GAP40","MLC1 (IN T. GONDII)","PHIL1","ESSENTIAL LIGHT CHAIN (ELC)","HUMAN COMPLEMENT FACTOR H"],"other_free_text":["C-terminal transmembrane helix anchors GAP50 in the IMC; six-residue C-terminal tail contacts other glideosome proteins","Soluble domain adopts an αββα purple-acid-phosphatase-like fold but is catalytically inactive (metal ions 18 Å apart)","C-terminal anchor is required for ER-to-apical-cap trafficking; anchor deletion mislocalizes the protein to the parasitophorous vacuole","Surface-bound factor H inactivates C3b, protecting gametes from complement lysis in the mosquito midgut","Anti-GAP50 antibodies inhibit zygote formation, indicating transmission-blocking vaccine potential"]}},"prefetch_data":{},"corpus_meta":[{"pmid":"16321976","id":"PMC_16321976","title":"A conserved molecular motor drives cell invasion and gliding motility across malaria life cycle stages and other apicomplexan parasites.","date":"2005","source":"The Journal of biological 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N.Y.)","url":"https://pubmed.ncbi.nlm.nih.gov/42594189","citation_count":0,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["GAP50"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":13672,"output_tokens":3311,"usd":0.04534,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":9038,"output_tokens":4284,"usd":0.076145,"stage2_stop_reason":"end_turn"},"total_usd":0.0,"stage1_batch_id":"msgbatch_01BW7vvc7h5iV39oJ1MHMzXw","stage2_batch_id":"msgbatch_01Kh5HbgbPXepNfNCbktYkSD","note":"batch pricing = 50% of standard","skipped":true},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2012,\n      \"finding\": \"Crystal structure of P. falciparum GAP50 (PF3D7_0918000) was solved at 1.7 Å resolution, revealing an αββα fold with overall similarity to purple acid phosphatases but with a fundamentally different active-site region; the structure showed two cobalt ions each with only one protein ligand and 18 Å apart (vs. 3.2 Å in purple acid phosphatases), indicating GAP50 is not a functional phosphatase. The C-terminal transmembrane helix anchors GAP50 into the inner membrane complex (IMC), and a short six-residue C-terminal tail interacts with other glideosome proteins.\",\n      \"method\": \"X-ray crystallography (1.7 Å resolution crystal structure of the soluble domain of PfGAP50)\",\n      \"journal\": \"Journal of structural biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — high-resolution crystal structure with structural validation and mechanistic interpretation of active-site residues, single lab but definitive structural method\",\n      \"pmids\": [\"22387043\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"P. falciparum GAP50 (PF3D7_0918000) was identified as an integral membrane protein of the IMC that forms a glideosome complex with PfGAP45, PfMyoA, and PfMTIP in late schizonts and merozoites, supporting erythrocyte invasion. The complex was detected by co-immunoprecipitation from late-schizont/merozoite lysates.\",\n      \"method\": \"Co-immunoprecipitation from P. falciparum blood-stage parasites; immunofluorescence assay for localization\",\n      \"journal\": \"Molecular and biochemical parasitology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal Co-IP establishing complex membership with localization, single lab, two orthogonal methods\",\n      \"pmids\": [\"16513191\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"GAP50 (PF3D7_0918000) is a core component of the Toxoplasma/Plasmodium glideosome; in Toxoplasma, functional dissection showed GAP50 is a polytopic IMC-anchored protein and forms a complex with GAP45, MyoA, and MLC1. The orthologous P. falciparum GAP45 can functionally substitute in T. gondii (transgenera complementation), supporting conserved complex architecture across the phylum.\",\n      \"method\": \"Genetic complementation across genera; co-immunoprecipitation; immunofluorescence; conditional knockdown\",\n      \"journal\": \"Cell host & microbe\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic complementation and co-IP across species, primary experiments in T. gondii with inference to P. falciparum GAP50 complex membership\",\n      \"pmids\": [\"20951968\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"PfGAP50-GFP (PF3D7_0918000) localizes to the endoplasmic reticulum in early-stage parasites and then redistributes to apical caps during daughter merozoite formation, extending around the merozoite surface in final schizogony. The C-terminal membrane anchor is required for correct trafficking: a construct lacking this anchor is misdirected to the parasitophorous vacuole. Full-length PfGAP50-GFP forms a complex with endogenous PfGAP45 and MTIP as shown by immunoprecipitation and FRAP.\",\n      \"method\": \"Live fluorescence imaging of GFP-tagged PfGAP50; FRAP; immunoprecipitation; 3D structured illumination microscopy; domain-deletion transfection\",\n      \"journal\": \"Eukaryotic cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (live imaging, FRAP, IP, super-resolution microscopy, deletion mutants) in a single focused study on this protein\",\n      \"pmids\": [\"21239623\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"PfGAP50 (PF3D7_0918000) was identified as part of a high-molecular-weight detergent-resistant membrane (DRM) complex together with GAP45 and myosin A in P. falciparum schizonts, isolated by blue native-PAGE and identified by mass spectrometry.\",\n      \"method\": \"Detergent-resistant membrane purification; blue native-PAGE; mass spectrometry\",\n      \"journal\": \"Molecular and biochemical parasitology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — mass spectrometry identification of complex in DRMs, single lab, single method for this specific protein\",\n      \"pmids\": [\"17553576\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"PfGAP50 (PF3D7_0918000) on the surface of emerging P. falciparum gametes binds human complement regulator factor H (FH) and uses surface-bound FH to inactivate complement protein C3b, protecting parasites from complement-mediated lysis in the mosquito midgut. Neutralization of FH or blockade of PfGAP50 significantly impaired gametogenesis and parasite transmission.\",\n      \"method\": \"Binding assays (FH to gamete surface/PfGAP50); complement lysis assays; antibody blockade; gametogenesis inhibition assay\",\n      \"journal\": \"Cell host & microbe\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct binding and functional blockade experiments with two orthogonal readouts (C3b inactivation, gametogenesis inhibition), single lab\",\n      \"pmids\": [\"23332154\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Homologues of glideosome-associated proteins including GAP50 (PF3D7_0918000) are present in P. falciparum merozoites and appear to function in erythrocyte invasion; MTRAP, a merozoite TRAP homologue identified in the same study, binds aldolase in vitro, linking the extracellular adhesin to the actin-myosin motor that includes GAP50.\",\n      \"method\": \"Immunofluorescence; in vitro aldolase-binding assay; bioinformatic genome analysis\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — localization by immunofluorescence only for GAP50 itself; the mechanistic aldolase-binding result is for MTRAP, not GAP50 directly\",\n      \"pmids\": [\"16321976\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"GAP50 (PF3D7_0918000) was identified by co-immunoprecipitation as a binding partner of PhIL1, a novel IMC-associated protein in both P. falciparum and P. berghei; this interaction places GAP50 in a PhIL1-containing protein complex overlapping with, but distinct from, the canonical glideosome.\",\n      \"method\": \"Co-immunoprecipitation / protein interactome (PhIL1 pulldown followed by mass spectrometry)\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single pulldown/MS identification, no reciprocal IP or functional validation specifically for GAP50's role in this complex\",\n      \"pmids\": [\"29138437\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}, {\"species\": \"Plasmodium berghei\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"GAP50 (PF3D7_0918000) remains a component of the glideosome complex (together with GAP40, an additional essential light chain ELC, MyoA, MTIP, and other candidate proteins) throughout the P. berghei life cycle in extracellular stages (ookinetes, sporozoites, merozoites); co-expression of MyoA with both light chains (MTIP and ELC) enhances MyoA-dependent actin motility in vitro.\",\n      \"method\": \"Immunofluorescence across life cycle stages; in vitro actin motility assay; co-immunoprecipitation/mass spectrometry of glideosome complex\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods (IFA across stages, in vitro motility, Co-IP/MS), single lab; GAP50's own contribution to motility not directly tested, but complex membership confirmed\",\n      \"pmids\": [\"28893907\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium berghei\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"PfGAP50 (PF3D7_0918000) co-precipitates with PfGAP45 and PfGAP40, and PfGAP40 knockdown reduces steady-state expression levels of both PfGAP45 and PfGAP50 in schizonts, indicating that GAP40 stabilizes GAP50 protein levels within the glideosome complex.\",\n      \"method\": \"Conditional knockdown (TetR-DOZI) of PfGAP40; co-immunoprecipitation; Western blot quantification of GAP50 levels\",\n      \"journal\": \"Microbiology spectrum\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — conditional KD with direct protein-level readout of GAP50 stability and Co-IP confirming physical interaction, single lab\",\n      \"pmids\": [\"37249423\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Antibodies raised against recombinant PfGAP50 (PF3D7_0918000) inhibited zygote formation by up to 55% in an in vitro zygote inhibition assay, demonstrating that GAP50-specific antibodies can block parasite transmission at the gamete/zygote stage.\",\n      \"method\": \"In vitro zygote inhibition assay with anti-PfGAP50 rabbit IgG; immunofluorescence assay confirming antibody specificity\",\n      \"journal\": \"BMC biotechnology\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — functional inhibition assay with polyclonal antibodies, single lab, no mechanistic dissection of which epitope/domain mediates the effect\",\n      \"pmids\": [\"26625934\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    }\n  ],\n  \"current_model\": \"PfGAP50 (PF3D7_0918000) is an integral IMC membrane protein anchored via its C-terminal transmembrane helix that serves as the structural anchor of the glideosome motor complex — physically associating with GAP45, MyoA, and MTIP — and whose correct trafficking from the ER to apical caps requires the C-terminal membrane anchor; structurally it adopts an αββα acid phosphatase-like fold but lacks phosphatase activity; on the gamete surface it binds human complement factor H to protect parasites from complement-mediated lysis in the mosquito midgut; and its protein levels are stabilized within the complex by GAP40.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"GAP50 (PF3D7_0918000) is an integral inner membrane complex (IMC) protein of Plasmodium that serves as the membrane anchor of the glideosome, the actin-myosin motor driving host-cell invasion [#1, #4]. It is anchored into the IMC by a C-terminal transmembrane helix, with a short six-residue C-terminal tail that engages other glideosome components, and physically associates with GAP45, MyoA, and MTIP in late schizonts and merozoites [#1, #3]. Its soluble domain adopts an \\u03b1\\u03b2\\u03b2\\u03b1 fold resembling purple acid phosphatases but with a fundamentally altered active site \\u2014 two cobalt ions 18 \\u00c5 apart, each with a single protein ligand \\u2014 establishing that GAP50 is a structural scaffold and not a functional phosphatase [#0]. Correct delivery of GAP50 depends on this C-terminal membrane anchor: the protein first localizes to the ER and redistributes to apical caps during merozoite formation, while anchor-deleted protein is mislocalized to the parasitophorous vacuole [#3]. GAP40 stabilizes steady-state GAP50 protein levels within the complex [#9]. Beyond its motor-anchoring role, surface-exposed GAP50 on emerging gametes binds human complement factor H to inactivate C3b and protect parasites from complement-mediated lysis in the mosquito midgut, and antibodies against GAP50 impair gametogenesis and zygote formation [#5, #10]. GAP50's own catalytic or motor-force contribution beyond complex anchoring has not been directly demonstrated in the available corpus.\",\n  \"teleology\": [\n    {\n      \"year\": 2005,\n      \"claim\": \"Establishing whether GAP50 is present in invasive merozoites was the first step toward linking it to the invasion motor, before any complex membership was defined.\",\n      \"evidence\": \"Immunofluorescence localization of glideosome homologues in P. falciparum merozoites, alongside an in vitro aldolase-binding assay for the co-identified adhesin MTRAP\",\n      \"pmids\": [\"16321976\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"The aldolase-binding result is for MTRAP, not GAP50 directly\", \"No direct interaction partners of GAP50 defined at this stage\", \"Localization by immunofluorescence only\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Defining GAP50 as a bona fide member of a motor complex answered whether it physically integrates with the actin-myosin machinery rather than merely co-localizing.\",\n      \"evidence\": \"Co-immunoprecipitation and immunofluorescence in P. falciparum late-schizont/merozoite lysates identifying a GAP50\\u2013GAP45\\u2013MyoA\\u2013MTIP complex in the IMC\",\n      \"pmids\": [\"16513191\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Which region of GAP50 mediates each interaction not resolved\", \"Direct contribution of GAP50 to motor force not tested\", \"Single-lab Co-IP\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Showing GAP50 in a high-molecular-weight detergent-resistant membrane complex established that the assembly is a stable membrane-embedded unit rather than a transient interaction.\",\n      \"evidence\": \"Detergent-resistant membrane purification, blue native-PAGE, and mass spectrometry of P. falciparum schizonts\",\n      \"pmids\": [\"17553576\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Stoichiometry of the complex unresolved\", \"Single method for this protein\", \"Functional consequence of DRM association untested\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Cross-genera dissection tested whether the glideosome architecture is conserved and whether GAP50 anchoring is a shared feature across apicomplexans.\",\n      \"evidence\": \"Genetic complementation of T. gondii with P. falciparum GAP45, co-IP, immunofluorescence, and conditional knockdown, placing GAP50 as a polytopic IMC-anchored complex component\",\n      \"pmids\": [\"20951968\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Primary functional experiments were in T. gondii, not P. falciparum GAP50\", \"GAP50-specific knockdown phenotype in Plasmodium not shown\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Tracking GAP50 trafficking answered how the anchor determines its delivery route to the IMC and confirmed its physical partnership within intact parasites.\",\n      \"evidence\": \"Live imaging, FRAP, 3D-SIM, immunoprecipitation, and C-terminal anchor-deletion transfection of GFP-tagged PfGAP50\",\n      \"pmids\": [\"21239623\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Trafficking machinery recognizing the anchor not identified\", \"Signal for ER-to-apical redistribution unknown\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Solving the crystal structure resolved whether GAP50's acid-phosphatase-like fold confers catalytic activity or a purely structural role.\",\n      \"evidence\": \"1.7 \\u00c5 X-ray crystal structure of the soluble domain revealing an \\u03b1\\u03b2\\u03b2\\u03b1 fold with a degenerate, non-catalytic active site (cobalt ions 18 \\u00c5 apart)\",\n      \"pmids\": [\"22387043\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structure of the full-length membrane-anchored protein not determined\", \"Atomic contacts of the C-terminal tail with glideosome partners not resolved\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Discovering GAP50 on the gamete surface established a transmission-stage role in complement evasion entirely distinct from its blood-stage motor function.\",\n      \"evidence\": \"Factor H binding assays to gamete surface/PfGAP50, complement lysis and C3b inactivation assays, antibody blockade, and gametogenesis inhibition in P. falciparum\",\n      \"pmids\": [\"23332154\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"How an IMC-anchored protein reaches the gamete surface unexplained\", \"FH-binding region of GAP50 not mapped\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Testing anti-GAP50 antibodies asked whether GAP50 is a viable transmission-blocking target at the gamete/zygote stage.\",\n      \"evidence\": \"In vitro zygote inhibition assay with anti-PfGAP50 rabbit IgG (up to 55% inhibition) plus immunofluorescence confirming specificity\",\n      \"pmids\": [\"26625934\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No mechanistic dissection of which epitope/domain mediates inhibition\", \"Polyclonal antibodies only\", \"In vivo transmission blockade not shown\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Interactome and life-cycle studies asked whether GAP50 associates only with the canonical glideosome or participates in additional complexes and stages.\",\n      \"evidence\": \"PhIL1 pulldown/MS in P. falciparum and P. berghei identifying GAP50 in a PhIL1 complex, and IFA/Co-IP/MS plus in vitro actin motility across P. berghei extracellular stages\",\n      \"pmids\": [\"29138437\", \"28893907\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"PhIL1 association from single pulldown without reciprocal IP or functional validation\", \"GAP50's own contribution to actin motility not directly tested\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}, {\"species\": \"Plasmodium berghei\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"Perturbing GAP40 tested how GAP50 protein levels are maintained within the complex, revealing an interdependence among glideosome components.\",\n      \"evidence\": \"TetR-DOZI conditional knockdown of PfGAP40 with Co-IP and Western blot quantification showing reduced GAP50 (and GAP45) levels\",\n      \"pmids\": [\"37249423\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether GAP40 acts by direct binding or by complex-assembly stabilization unresolved\", \"GAP50 degradation pathway upon GAP40 loss not defined\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"It remains unknown what specific mechanical or biochemical contribution GAP50 makes to glideosome force generation beyond serving as the membrane anchor, and how the same protein is dually deployed as an IMC scaffold and a surface complement-evasion factor.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No direct GAP50 loss-of-function motor phenotype in Plasmodium\", \"Trafficking route to the gamete surface unexplained\", \"No structure of the intact membrane-anchored complex\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0005515\", \"supporting_discovery_ids\": [1, 3, 7, 9]},\n      {\"term_id\": \"GO:0001848\", \"supporting_discovery_ids\": [5]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005789\", \"supporting_discovery_ids\": [3]},\n      {\"term_id\": \"GO:0016020\", \"supporting_discovery_ids\": [0, 1]},\n      {\"term_id\": \"GO:0009986\", \"supporting_discovery_ids\": [5]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"GO:0070588\", \"supporting_discovery_ids\": [1, 6]},\n      {\"term_id\": \"GO:0030449\", \"supporting_discovery_ids\": [5]}\n    ],\n    \"complexes\": [\n      \"Glideosome motor complex (GAP50\\u2013GAP45\\u2013MyoA\\u2013MTIP)\",\n      \"GAP40-containing glideosome complex\",\n      \"PhIL1-associated IMC complex\"\n    ],\n    \"partners\": [\n      \"GAP45\",\n      \"MyoA (myosin A)\",\n      \"MTIP\",\n      \"GAP40\",\n      \"MLC1 (in T. gondii)\",\n      \"PhIL1\",\n      \"essential light chain (ELC)\",\n      \"human complement factor H\"\n    ],\n    \"other_free_text\": [\n      \"C-terminal transmembrane helix anchors GAP50 in the IMC; six-residue C-terminal tail contacts other glideosome proteins\",\n      \"Soluble domain adopts an \\u03b1\\u03b2\\u03b2\\u03b1 purple-acid-phosphatase-like fold but is catalytically inactive (metal ions 18 \\u00c5 apart)\",\n      \"C-terminal anchor is required for ER-to-apical-cap trafficking; anchor deletion mislocalizes the protein to the parasitophorous vacuole\",\n      \"Surface-bound factor H inactivates C3b, protecting gametes from complement lysis in the mosquito midgut\",\n      \"Anti-GAP50 antibodies inhibit zygote formation, indicating transmission-blocking vaccine potential\"\n    ]\n  }\n}","audit_flag":null,"strains":[{"strain":"Pf3D7","gene_id":"PF3D7_0918000","name":null,"product":"glideosome-associated protein 50","uniprot_acc":null,"chromosome":null,"start_pos":null},{"strain":"PbANKA","gene_id":"PBANKA_0819000","name":null,"product":"glideosome-associated protein 50, putative","uniprot_acc":null,"chromosome":null,"start_pos":null},{"strain":"PkH","gene_id":"PKNH_0716000","name":null,"product":"glideosome-associated protein 50, putative","uniprot_acc":null,"chromosome":null,"start_pos":null}],"gene_symbol":"GAP50","evaluation":null}