{"gene":"PF3D7_1355200","run_date":"2026-09-08T14:19:06","timeline":{"discoveries":[{"year":1990,"finding":"RAP-1 is a rhoptry-associated protein consisting of multiple components (80, 65, 42, 40, 77, and 70 kDa proteins) that are immunologically cross-reactive and appear to be derived from the same precursor protein; the antigen is lipophilic and disulfide bonding plays an important role in its structure.","method":"Immunoaffinity chromatography, SDS-PAGE, Western blot, autocatalytic processing analysis, monoclonal antibody epitope mapping","journal":"Molecular and biochemical parasitology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal biochemical methods (purification, immunoblot, processing analysis) in a single study; single lab","pmids":["2200961"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":1992,"finding":"RAP-1 is processed from an 80-kDa precursor (p80) in early schizogony to a 65-kDa form (p65) in late schizogony; inhibitory monoclonal antibodies map their epitopes to a region 10–20 amino acids C-terminal to the proteolytic cleavage site at amino acid 190; the p65 form is absent from purified merozoites, suggesting its generation is associated with merozoite release rather than erythrocyte invasion.","method":"Western blot, beta-galactosidase fusion protein epitope mapping, synthetic peptide reactivity assays, in vitro growth inhibition assays","journal":"Molecular and biochemical parasitology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — epitope mapping with fusion proteins and synthetic peptides plus functional inhibition assay; single lab","pmids":["1279419"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":1995,"finding":"Transport of the RAP-1 gene product to the rhoptries is regulated by the secretory pathway: brefeldin A and low temperature reversibly block processing of the 86-kDa precursor (Pr86) to the mature 82-kDa RAP-1 (p82); N-ethylmaleimide (which prevents Golgi vesicle fusion) irreversibly blocks this processing. In vitro translation revealed a cleavable N-terminal signal peptide and an 84-kDa primary translation product, indicating the RAP-1 product acquires an additional protein modification during maturation.","method":"Brefeldin A and low-temperature block experiments on intact cells, N-ethylmaleimide treatment, in vitro translation, immunoblot analysis","journal":"Molecular and biochemical parasitology","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple pharmacological perturbations of the secretory pathway with consistent results plus in vitro translation; mechanistically convergent findings from orthogonal approaches","pmids":["8719244"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":1998,"finding":"RAP-1 precursor Pr86 undergoes two sequential processing events in the rhoptries: rapid cleavage to p82 and delayed cleavage to p67, both involving progressive removal of epitopes from the amino-terminus. Pr86 forms complexes that also contain RAP-2 product p39 and RAP-3 product p37. p67 and p82 are the major RAP-1 forms in purified merozoites, but are not relocalized to the merozoite surface under conditions that promote AMA-1 relocalization. Since p67 is absent from ring-stage parasites, it may function during a narrow window of merozoite invasion.","method":"Immunoblot with epitope-mapped antibodies, size fractionation with brefeldin A block, immunofluorescence localization, merozoite purification","journal":"Molecular and biochemical parasitology","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (epitope mapping, fractionation under BFA block, IFA, merozoite purification) in a single rigorous study demonstrating processing pathway and complex formation","pmids":["9574915"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":1998,"finding":"Two inhibitory epitopes (iB-1 at N200–Y211, and iB-2) in RAP-1 are located near the amino-terminus of p67. Anti-iB-1 antibodies are produced during infection but are not immunodominant and are not readily boosted upon reinfection in owl monkeys. A monoclonal antibody (1D6) binding iB-2 inhibits erythrocyte invasion in vitro.","method":"Owl monkey immunization and reinfection, ELISA antibody mapping, in vitro invasion inhibition assay with monoclonal antibodies","journal":"Infection and immunity","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vitro invasion inhibition confirmed for iB-2 MAb; iB-1 immunogenicity data from monkey model; single lab","pmids":["9423886"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2007,"finding":"RAP-1 is a core component of two low molecular weight rhoptry complexes (RAP1/RAP2 and RAP1/RAP3) identified in detergent-resistant membranes (DRMs) of schizonts by blue native-PAGE and mass spectrometry; RAP-1 is highly abundant in high-molecular-weight DRM species, suggesting participation in larger aggregated complexes.","method":"DRM purification, blue native-PAGE, mass spectrometry","journal":"Molecular and biochemical parasitology","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — MS-based complex identification replicated known RAP1/2 and RAP1/3 complexes in DRMs; no functional validation beyond complex membership","pmids":["17553576"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2007,"finding":"RAP-1 and RAP-2 (but not RAP-3) bind to the surface of normal (non-parasitized) erythrocytes; RAP-1 gene-disruption mutants lose the capacity to tag bystander erythrocytes, implicating RAP-1 directly in this binding activity.","method":"RAP-1 gene-disruption mutant parasites, surface iodination experiments, antibody binding assays on normal erythrocytes","journal":"The Journal of infectious diseases","confidence":"High","confidence_rationale":"Tier 2 / Strong — gene disruption of RAP-1 with direct functional readout (loss of erythrocyte tagging) combined with surface iodination; mechanistically clean loss-of-function experiment","pmids":["17624849"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2010,"finding":"PfRAP-1 is identified as part of a large merozoite surface protein-1 (MSP-1) associated complex: pull-down experiments with anti-MSP-1 or anti-RhopH3 antibodies co-isolated PfRAP-1 and PfRAP-2, along with MSP-3, MSP-6, MSP-7, MSP-9, RhopH1, and RhopH3. The complex is present at schizont/merozoite stages and shed into culture supernatant.","method":"Co-immunoprecipitation/pull-down with merozoite lysate, tandem mass spectrometry identification","journal":"Journal of proteome research","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single lab, single pulldown experiment; complex membership established but no direct functional validation for RAP-1 specifically","pmids":["21175202"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2017,"finding":"The RAP complex (including RAP-1) is not required for rhoptry morphology or erythrocyte invasion per se; instead, conditional knockdown of RAP complex members leads to altered parasitophorous vacuolar membrane (PVM) structure, delayed intraerythrocytic growth, and reduced parasitemia in infected mice, indicating a post-invasion role in PVM integrity and parasite survival within the host cell.","method":"Conditional knockdown of RAP complex members (P. falciparum and P. berghei), electron microscopy of PVM, parasitemia measurements in mice","journal":"Cellular microbiology","confidence":"High","confidence_rationale":"Tier 2 / Strong — conditional knockdown with defined post-invasion cellular phenotype (PVM structural alteration, growth delay) replicated across P. falciparum and P. berghei; multiple orthogonal readouts","pmids":["28205319"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""},{"species":"Plasmodium berghei","strain":""}]},{"year":2018,"finding":"In P. berghei, RAP-1 is required for targeting of RAP-2 to the rhoptries; deletion of RAP-1 in P. berghei ANKA resulted in increased early-phase parasitemia but prolonged host survival compared to controls, indicating RAP-1 contributes to parasite virulence.","method":"Genetic deletion of RAP-1 in P. berghei ANKA, immunofluorescence localization of RAP-2, mouse infection outcome monitoring","journal":"Experimental parasitology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — clean knockout with localization and in vivo phenotype readouts; single lab but multiple methods","pmids":["29307564"],"is_preprint":false,"attribution":[{"species":"Plasmodium berghei","strain":"ANKA"}]},{"year":1992,"finding":"Three matrix metalloproteinases (220, 95, and 70 kDa) co-isolate with the RAP-1 complex by immunoaffinity chromatography, but these enzymes originate from human serum used to culture P. falciparum in vitro (not from the parasite itself), as confirmed by immunoprecipitation with macrophage/fibroblast gelatinase antisera that did not react with intracellular parasites by IFA.","method":"Co-immunoaffinity isolation, proteinase inhibitor panel, metal ion dose-response, immunoprecipitation with anti-gelatinase antisera, indirect immunofluorescence","journal":"Biochimica et biophysica acta","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single study; establishes that metalloproteinase co-isolation is a serum artifact, not a genuine RAP-1 interaction; negative finding for parasite-derived interaction","pmids":["1477099"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]}],"current_model":"PF3D7_1355200 (RAP-1) is a rhoptry bulb protein synthesized as an ~84–86 kDa precursor with a cleavable N-terminal signal peptide that is transported to the rhoptries via the secretory pathway (sensitive to brefeldin A and N-ethylmaleimide), where it undergoes sequential proteolytic processing to p82 and then p67; it forms the core of two low-molecular-weight rhoptry complexes (RAP-1/RAP-2 and RAP-1/RAP-3) and is required for correct targeting of RAP-2 to the rhoptries; after invasion, the RAP complex localises to the parasitophorous vacuolar membrane where it is required for PVM structural integrity and intraerythrocytic parasite growth rather than for invasion itself, and RAP-1 also mediates binding to the surface of non-parasitized erythrocytes."},"narrative":{"mechanistic_narrative":"PF3D7_1355200 (RAP-1) is a rhoptry bulb protein of Plasmodium falciparum that serves as the organizing core of the low-molecular-weight rhoptry protein complexes and, following invasion, contributes to parasitophorous vacuolar membrane (PVM) integrity and intraerythrocytic growth [PMID:28205319]. It is synthesized as an ~84–86 kDa precursor bearing a cleavable N-terminal signal peptide and is trafficked to the rhoptries through the classical secretory pathway, since processing of the 86-kDa precursor to mature p82 is reversibly blocked by brefeldin A and low temperature and irreversibly blocked by N-ethylmaleimide [PMID:8719244]. Within the rhoptries the precursor is proteolytically matured in sequential steps — rapid cleavage to p82 and delayed cleavage to p67 — each removing N-terminal epitopes, with a cleavage site near residue 190 and inhibitory epitopes clustered just C-terminal to it [PMID:1279419, PMID:9574915]. RAP-1 forms the core of two distinct complexes, RAP-1/RAP-2 and RAP-1/RAP-3, resolved in detergent-resistant membranes of schizonts [PMID:17553576, PMID:9574915], and it is required for correct targeting of RAP-2 to the rhoptries [PMID:29307564]. Contrary to a role in invasion itself, conditional knockdown of RAP complex members leaves rhoptry morphology and invasion intact but alters PVM structure and delays intraerythrocytic growth, defining a post-invasion function [PMID:28205319]. RAP-1 also directly mediates binding to the surface of non-parasitized erythrocytes, an activity lost upon gene disruption [PMID:17624849]. In P. berghei, deletion of RAP-1 modulates parasitemia kinetics and host survival, linking it to virulence [PMID:29307564].","teleology":[{"year":1990,"claim":"Establishing that RAP-1 is a rhoptry antigen composed of multiple immunologically related forms derived from one precursor first defined it as a processed, structurally complex protein rather than a set of independent antigens.","evidence":"Immunoaffinity purification, SDS-PAGE and immunoblotting with epitope-mapped monoclonal antibodies on P. falciparum","pmids":["2200961"],"confidence":"Medium","gaps":["Identity of the processing protease not determined","Functional role of the multiple forms unresolved"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":1992,"claim":"Mapping precursor-to-product processing (p80→p65) and locating inhibitory epitopes near the cleavage site connected proteolytic maturation to the timing of merozoite release and to invasion-inhibitory determinants.","evidence":"Immunoblot across schizogony, fusion-protein and synthetic-peptide epitope mapping, in vitro growth inhibition in P. falciparum","pmids":["1279419"],"confidence":"Medium","gaps":["Mechanistic link between p65 generation and merozoite release not shown","Protease responsible for cleavage at aa 190 unidentified"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":1992,"claim":"Testing whether co-isolated matrix metalloproteinases were genuine RAP-1 partners showed they derive from human culture serum, excluding them from the RAP-1 interactome and cautioning against affinity co-isolation artifacts.","evidence":"Co-immunoaffinity isolation, inhibitor/metal panels, anti-gelatinase immunoprecipitation and IFA in P. falciparum cultures","pmids":["1477099"],"confidence":"Low","gaps":["Negative/artifact finding; single study","Does not address which proteins are true RAP-1 partners"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":1995,"claim":"Perturbing the secretory pathway resolved how RAP-1 reaches the rhoptries, showing precursor maturation depends on Golgi transit and that the protein carries a cleavable signal peptide.","evidence":"Brefeldin A / low-temperature and N-ethylmaleimide blocks, in vitro translation and immunoblot in P. falciparum","pmids":["8719244"],"confidence":"High","gaps":["Nature of the additional maturation modification not identified","Rhoptry-targeting signal within RAP-1 not mapped"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":1998,"claim":"Defining the sequential Pr86→p82→p67 processing pathway and demonstrating co-complexing with RAP-2 (p39) and RAP-3 (p37) established RAP-1 as the shared core of the rhoptry RAP complexes and pinpointed p67 to a narrow invasion window.","evidence":"Epitope-mapped immunoblotting, size fractionation under BFA block, IFA and merozoite purification in P. falciparum","pmids":["9574915"],"confidence":"High","gaps":["Function of the delayed p67 cleavage untested","Stoichiometry and interface of the RAP complexes unknown"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":1998,"claim":"Localizing inhibitory epitopes to the p67 N-terminus and showing an anti-iB-2 monoclonal blocks invasion linked specific RAP-1 regions to functionally relevant, antibody-accessible determinants.","evidence":"Owl monkey immunization/reinfection, ELISA epitope mapping, monoclonal antibody invasion inhibition in P. falciparum","pmids":["9423886"],"confidence":"Medium","gaps":["Mechanism by which anti-iB-2 blocks invasion not defined","iB-1 poorly immunogenic, limiting vaccine relevance"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2007,"claim":"Biochemical resolution of RAP-1/RAP-2 and RAP-1/RAP-3 as discrete detergent-resistant-membrane complexes confirmed RAP-1's role as the shared core and placed it in higher-order membrane assemblies.","evidence":"Detergent-resistant membrane purification, blue native-PAGE and mass spectrometry in P. falciparum schizonts","pmids":["17553576"],"confidence":"Medium","gaps":["Composition of the higher-molecular-weight aggregates not resolved","No functional validation beyond membership"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2007,"claim":"Gene disruption showed RAP-1 is directly responsible for tagging non-parasitized erythrocytes, assigning it a discrete adhesive activity on bystander cells.","evidence":"RAP-1 gene-disruption mutants, surface iodination and antibody binding assays on normal erythrocytes in P. falciparum","pmids":["17624849"],"confidence":"High","gaps":["Erythrocyte receptor for RAP-1 binding unidentified","Physiological consequence of bystander tagging unclear"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2010,"claim":"Pull-downs placed RAP-1 within a large shed MSP-1-associated merozoite surface complex, broadening its potential association network beyond the rhoptry RAP complexes.","evidence":"Co-immunoprecipitation with anti-MSP-1/anti-RhopH3 and tandem mass spectrometry of P. falciparum merozoite lysate","pmids":["21175202"],"confidence":"Low","gaps":["Single pull-down without reciprocal or functional validation for RAP-1","Direct versus indirect association with MSP-1 not distinguished"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2017,"claim":"Conditional knockdown redefined RAP-1's function: rather than being needed for invasion or rhoptry morphology, the RAP complex is required post-invasion for PVM integrity and intraerythrocytic growth.","evidence":"Conditional knockdown of RAP complex members in P. falciparum and P. berghei, PVM electron microscopy, parasitemia in mice","pmids":["28205319"],"confidence":"High","gaps":["Molecular basis of RAP-1's PVM-stabilizing role unknown","Whether RAP-1 acts directly at the PVM or via partners unresolved"],"attribution":[{"species":"Plasmodium falciparum","strain":""},{"species":"Plasmodium berghei","strain":""}]},{"year":2018,"claim":"Clean deletion in P. berghei established that RAP-1 targets RAP-2 to the rhoptries and modulates parasitemia kinetics and host survival, linking the protein to virulence.","evidence":"Genetic deletion of RAP-1 in P. berghei ANKA, IFA localization of RAP-2, mouse infection outcome monitoring","pmids":["29307564"],"confidence":"Medium","gaps":["Mechanism of RAP-2 targeting by RAP-1 not defined","Basis for the paradoxical higher parasitemia yet prolonged survival unexplained"],"attribution":[{"species":"Plasmodium berghei","strain":"ANKA"}]},{"year":null,"claim":"How RAP-1 mechanistically stabilizes the PVM and what erythrocyte receptor mediates its bystander-binding activity remain unresolved.","evidence":"","pmids":[],"confidence":"High","gaps":["No structural model of RAP-1 or the RAP complexes","Direct molecular partners at the PVM unidentified","Erythrocyte-surface ligand of RAP-1 unknown"],"attribution":[]}],"mechanism_profile":{"molecular_activity":[],"localization":[],"pathway":[],"complexes":["RAP-1/RAP-2 rhoptry complex","RAP-1/RAP-3 rhoptry complex","MSP-1-associated merozoite surface complex (RAP-1, RAP-2, MSP-3/6/7/9, RhopH1, RhopH3)"],"partners":["RAP-2","RAP-3"],"other_free_text":["Synthesized as ~84–86 kDa precursor (Pr86) with cleavable N-terminal signal peptide; matured sequentially to p82 then p67 [#2, #3].","Cleavage site near amino acid 190 with inhibitory epitopes (iB-1 N200–Y211, iB-2) immediately C-terminal [#1, #4].","Required for correct rhoptry targeting of RAP-2 in P. berghei [#9].","RAP complex knockdown alters PVM structure and delays intraerythrocytic growth without affecting invasion [#8].","Co-isolated matrix metalloproteinases are a human-serum artifact, not genuine RAP-1 partners [#10]."]}},"prefetch_data":{},"corpus_meta":[{"pmid":"7838184","id":"PMC_7838184","title":"Differential localization of full-length and processed forms of 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diseases","url":"https://pubmed.ncbi.nlm.nih.gov/18928377","citation_count":14,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["RAP"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"20026428","id":"PMC_20026428","title":"Limited genetic polymorphism of the Plasmodium vivax low molecular weight rhoptry protein complex in the Colombian population.","date":"2009","source":"Infection, genetics and evolution : journal of molecular epidemiology and evolutionary genetics in infectious diseases","url":"https://pubmed.ncbi.nlm.nih.gov/20026428","citation_count":14,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["RAP"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"26847346","id":"PMC_26847346","title":"Genetic diversity and natural selection in the rhoptry-associated protein 1 (RAP-1) of recent Plasmodium knowlesi clinical 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antigen is lipophilic and disulfide bonding plays an important role in its structure.\",\n      \"method\": \"Immunoaffinity chromatography, SDS-PAGE, Western blot, autocatalytic processing analysis, monoclonal antibody epitope mapping\",\n      \"journal\": \"Molecular and biochemical parasitology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal biochemical methods (purification, immunoblot, processing analysis) in a single study; single lab\",\n      \"pmids\": [\"2200961\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 1992,\n      \"finding\": \"RAP-1 is processed from an 80-kDa precursor (p80) in early schizogony to a 65-kDa form (p65) in late schizogony; inhibitory monoclonal antibodies map their epitopes to a region 10–20 amino acids C-terminal to the proteolytic cleavage site at amino acid 190; the p65 form is absent from purified merozoites, suggesting its generation is associated with merozoite release rather than erythrocyte invasion.\",\n      \"method\": \"Western blot, beta-galactosidase fusion protein epitope mapping, synthetic peptide reactivity assays, in vitro growth inhibition assays\",\n      \"journal\": \"Molecular and biochemical parasitology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — epitope mapping with fusion proteins and synthetic peptides plus functional inhibition assay; single lab\",\n      \"pmids\": [\"1279419\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 1995,\n      \"finding\": \"Transport of the RAP-1 gene product to the rhoptries is regulated by the secretory pathway: brefeldin A and low temperature reversibly block processing of the 86-kDa precursor (Pr86) to the mature 82-kDa RAP-1 (p82); N-ethylmaleimide (which prevents Golgi vesicle fusion) irreversibly blocks this processing. In vitro translation revealed a cleavable N-terminal signal peptide and an 84-kDa primary translation product, indicating the RAP-1 product acquires an additional protein modification during maturation.\",\n      \"method\": \"Brefeldin A and low-temperature block experiments on intact cells, N-ethylmaleimide treatment, in vitro translation, immunoblot analysis\",\n      \"journal\": \"Molecular and biochemical parasitology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple pharmacological perturbations of the secretory pathway with consistent results plus in vitro translation; mechanistically convergent findings from orthogonal approaches\",\n      \"pmids\": [\"8719244\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"RAP-1 precursor Pr86 undergoes two sequential processing events in the rhoptries: rapid cleavage to p82 and delayed cleavage to p67, both involving progressive removal of epitopes from the amino-terminus. Pr86 forms complexes that also contain RAP-2 product p39 and RAP-3 product p37. p67 and p82 are the major RAP-1 forms in purified merozoites, but are not relocalized to the merozoite surface under conditions that promote AMA-1 relocalization. Since p67 is absent from ring-stage parasites, it may function during a narrow window of merozoite invasion.\",\n      \"method\": \"Immunoblot with epitope-mapped antibodies, size fractionation with brefeldin A block, immunofluorescence localization, merozoite purification\",\n      \"journal\": \"Molecular and biochemical parasitology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (epitope mapping, fractionation under BFA block, IFA, merozoite purification) in a single rigorous study demonstrating processing pathway and complex formation\",\n      \"pmids\": [\"9574915\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"Two inhibitory epitopes (iB-1 at N200–Y211, and iB-2) in RAP-1 are located near the amino-terminus of p67. Anti-iB-1 antibodies are produced during infection but are not immunodominant and are not readily boosted upon reinfection in owl monkeys. A monoclonal antibody (1D6) binding iB-2 inhibits erythrocyte invasion in vitro.\",\n      \"method\": \"Owl monkey immunization and reinfection, ELISA antibody mapping, in vitro invasion inhibition assay with monoclonal antibodies\",\n      \"journal\": \"Infection and immunity\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vitro invasion inhibition confirmed for iB-2 MAb; iB-1 immunogenicity data from monkey model; single lab\",\n      \"pmids\": [\"9423886\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"RAP-1 is a core component of two low molecular weight rhoptry complexes (RAP1/RAP2 and RAP1/RAP3) identified in detergent-resistant membranes (DRMs) of schizonts by blue native-PAGE and mass spectrometry; RAP-1 is highly abundant in high-molecular-weight DRM species, suggesting participation in larger aggregated complexes.\",\n      \"method\": \"DRM purification, blue native-PAGE, mass spectrometry\",\n      \"journal\": \"Molecular and biochemical parasitology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — MS-based complex identification replicated known RAP1/2 and RAP1/3 complexes in DRMs; no functional validation beyond complex membership\",\n      \"pmids\": [\"17553576\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"RAP-1 and RAP-2 (but not RAP-3) bind to the surface of normal (non-parasitized) erythrocytes; RAP-1 gene-disruption mutants lose the capacity to tag bystander erythrocytes, implicating RAP-1 directly in this binding activity.\",\n      \"method\": \"RAP-1 gene-disruption mutant parasites, surface iodination experiments, antibody binding assays on normal erythrocytes\",\n      \"journal\": \"The Journal of infectious diseases\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — gene disruption of RAP-1 with direct functional readout (loss of erythrocyte tagging) combined with surface iodination; mechanistically clean loss-of-function experiment\",\n      \"pmids\": [\"17624849\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"PfRAP-1 is identified as part of a large merozoite surface protein-1 (MSP-1) associated complex: pull-down experiments with anti-MSP-1 or anti-RhopH3 antibodies co-isolated PfRAP-1 and PfRAP-2, along with MSP-3, MSP-6, MSP-7, MSP-9, RhopH1, and RhopH3. The complex is present at schizont/merozoite stages and shed into culture supernatant.\",\n      \"method\": \"Co-immunoprecipitation/pull-down with merozoite lysate, tandem mass spectrometry identification\",\n      \"journal\": \"Journal of proteome research\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single lab, single pulldown experiment; complex membership established but no direct functional validation for RAP-1 specifically\",\n      \"pmids\": [\"21175202\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"The RAP complex (including RAP-1) is not required for rhoptry morphology or erythrocyte invasion per se; instead, conditional knockdown of RAP complex members leads to altered parasitophorous vacuolar membrane (PVM) structure, delayed intraerythrocytic growth, and reduced parasitemia in infected mice, indicating a post-invasion role in PVM integrity and parasite survival within the host cell.\",\n      \"method\": \"Conditional knockdown of RAP complex members (P. falciparum and P. berghei), electron microscopy of PVM, parasitemia measurements in mice\",\n      \"journal\": \"Cellular microbiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — conditional knockdown with defined post-invasion cellular phenotype (PVM structural alteration, growth delay) replicated across P. falciparum and P. berghei; multiple orthogonal readouts\",\n      \"pmids\": [\"28205319\"],\n      \"is_preprint\": false,\n      \"attribution\": [\n        {\"species\": \"Plasmodium falciparum\", \"strain\": \"\"},\n        {\"species\": \"Plasmodium berghei\", \"strain\": \"\"}\n      ]\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"In P. berghei, RAP-1 is required for targeting of RAP-2 to the rhoptries; deletion of RAP-1 in P. berghei ANKA resulted in increased early-phase parasitemia but prolonged host survival compared to controls, indicating RAP-1 contributes to parasite virulence.\",\n      \"method\": \"Genetic deletion of RAP-1 in P. berghei ANKA, immunofluorescence localization of RAP-2, mouse infection outcome monitoring\",\n      \"journal\": \"Experimental parasitology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — clean knockout with localization and in vivo phenotype readouts; single lab but multiple methods\",\n      \"pmids\": [\"29307564\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium berghei\", \"strain\": \"ANKA\"}]\n    },\n    {\n      \"year\": 1992,\n      \"finding\": \"Three matrix metalloproteinases (220, 95, and 70 kDa) co-isolate with the RAP-1 complex by immunoaffinity chromatography, but these enzymes originate from human serum used to culture P. falciparum in vitro (not from the parasite itself), as confirmed by immunoprecipitation with macrophage/fibroblast gelatinase antisera that did not react with intracellular parasites by IFA.\",\n      \"method\": \"Co-immunoaffinity isolation, proteinase inhibitor panel, metal ion dose-response, immunoprecipitation with anti-gelatinase antisera, indirect immunofluorescence\",\n      \"journal\": \"Biochimica et biophysica acta\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single study; establishes that metalloproteinase co-isolation is a serum artifact, not a genuine RAP-1 interaction; negative finding for parasite-derived interaction\",\n      \"pmids\": [\"1477099\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    }\n  ],\n  \"current_model\": \"PF3D7_1355200 (RAP-1) is a rhoptry bulb protein synthesized as an ~84–86 kDa precursor with a cleavable N-terminal signal peptide that is transported to the rhoptries via the secretory pathway (sensitive to brefeldin A and N-ethylmaleimide), where it undergoes sequential proteolytic processing to p82 and then p67; it forms the core of two low-molecular-weight rhoptry complexes (RAP-1/RAP-2 and RAP-1/RAP-3) and is required for correct targeting of RAP-2 to the rhoptries; after invasion, the RAP complex localises to the parasitophorous vacuolar membrane where it is required for PVM structural integrity and intraerythrocytic parasite growth rather than for invasion itself, and RAP-1 also mediates binding to the surface of non-parasitized erythrocytes.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"PF3D7_1355200 (RAP-1) is a rhoptry bulb protein of Plasmodium falciparum that serves as the organizing core of the low-molecular-weight rhoptry protein complexes and, following invasion, contributes to parasitophorous vacuolar membrane (PVM) integrity and intraerythrocytic growth [#8]. It is synthesized as an ~84–86 kDa precursor bearing a cleavable N-terminal signal peptide and is trafficked to the rhoptries through the classical secretory pathway, since processing of the 86-kDa precursor to mature p82 is reversibly blocked by brefeldin A and low temperature and irreversibly blocked by N-ethylmaleimide [#2]. Within the rhoptries the precursor is proteolytically matured in sequential steps — rapid cleavage to p82 and delayed cleavage to p67 — each removing N-terminal epitopes, with a cleavage site near residue 190 and inhibitory epitopes clustered just C-terminal to it [#1, #3]. RAP-1 forms the core of two distinct complexes, RAP-1/RAP-2 and RAP-1/RAP-3, resolved in detergent-resistant membranes of schizonts [#5, #3], and it is required for correct targeting of RAP-2 to the rhoptries [#9]. Contrary to a role in invasion itself, conditional knockdown of RAP complex members leaves rhoptry morphology and invasion intact but alters PVM structure and delays intraerythrocytic growth, defining a post-invasion function [#8]. RAP-1 also directly mediates binding to the surface of non-parasitized erythrocytes, an activity lost upon gene disruption [#6]. In P. berghei, deletion of RAP-1 modulates parasitemia kinetics and host survival, linking it to virulence [#9].\",\n  \"teleology\": [\n    {\n      \"year\": 1990,\n      \"claim\": \"Establishing that RAP-1 is a rhoptry antigen composed of multiple immunologically related forms derived from one precursor first defined it as a processed, structurally complex protein rather than a set of independent antigens.\",\n      \"evidence\": \"Immunoaffinity purification, SDS-PAGE and immunoblotting with epitope-mapped monoclonal antibodies on P. falciparum\",\n      \"pmids\": [\"2200961\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Identity of the processing protease not determined\", \"Functional role of the multiple forms unresolved\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 1992,\n      \"claim\": \"Mapping precursor-to-product processing (p80\\u2192p65) and locating inhibitory epitopes near the cleavage site connected proteolytic maturation to the timing of merozoite release and to invasion-inhibitory determinants.\",\n      \"evidence\": \"Immunoblot across schizogony, fusion-protein and synthetic-peptide epitope mapping, in vitro growth inhibition in P. falciparum\",\n      \"pmids\": [\"1279419\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanistic link between p65 generation and merozoite release not shown\", \"Protease responsible for cleavage at aa 190 unidentified\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 1992,\n      \"claim\": \"Testing whether co-isolated matrix metalloproteinases were genuine RAP-1 partners showed they derive from human culture serum, excluding them from the RAP-1 interactome and cautioning against affinity co-isolation artifacts.\",\n      \"evidence\": \"Co-immunoaffinity isolation, inhibitor/metal panels, anti-gelatinase immunoprecipitation and IFA in P. falciparum cultures\",\n      \"pmids\": [\"1477099\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Negative/artifact finding; single study\", \"Does not address which proteins are true RAP-1 partners\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 1995,\n      \"claim\": \"Perturbing the secretory pathway resolved how RAP-1 reaches the rhoptries, showing precursor maturation depends on Golgi transit and that the protein carries a cleavable signal peptide.\",\n      \"evidence\": \"Brefeldin A / low-temperature and N-ethylmaleimide blocks, in vitro translation and immunoblot in P. falciparum\",\n      \"pmids\": [\"8719244\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Nature of the additional maturation modification not identified\", \"Rhoptry-targeting signal within RAP-1 not mapped\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 1998,\n      \"claim\": \"Defining the sequential Pr86\\u2192p82\\u2192p67 processing pathway and demonstrating co-complexing with RAP-2 (p39) and RAP-3 (p37) established RAP-1 as the shared core of the rhoptry RAP complexes and pinpointed p67 to a narrow invasion window.\",\n      \"evidence\": \"Epitope-mapped immunoblotting, size fractionation under BFA block, IFA and merozoite purification in P. falciparum\",\n      \"pmids\": [\"9574915\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Function of the delayed p67 cleavage untested\", \"Stoichiometry and interface of the RAP complexes unknown\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 1998,\n      \"claim\": \"Localizing inhibitory epitopes to the p67 N-terminus and showing an anti-iB-2 monoclonal blocks invasion linked specific RAP-1 regions to functionally relevant, antibody-accessible determinants.\",\n      \"evidence\": \"Owl monkey immunization/reinfection, ELISA epitope mapping, monoclonal antibody invasion inhibition in P. falciparum\",\n      \"pmids\": [\"9423886\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism by which anti-iB-2 blocks invasion not defined\", \"iB-1 poorly immunogenic, limiting vaccine relevance\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Biochemical resolution of RAP-1/RAP-2 and RAP-1/RAP-3 as discrete detergent-resistant-membrane complexes confirmed RAP-1's role as the shared core and placed it in higher-order membrane assemblies.\",\n      \"evidence\": \"Detergent-resistant membrane purification, blue native-PAGE and mass spectrometry in P. falciparum schizonts\",\n      \"pmids\": [\"17553576\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Composition of the higher-molecular-weight aggregates not resolved\", \"No functional validation beyond membership\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Gene disruption showed RAP-1 is directly responsible for tagging non-parasitized erythrocytes, assigning it a discrete adhesive activity on bystander cells.\",\n      \"evidence\": \"RAP-1 gene-disruption mutants, surface iodination and antibody binding assays on normal erythrocytes in P. falciparum\",\n      \"pmids\": [\"17624849\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Erythrocyte receptor for RAP-1 binding unidentified\", \"Physiological consequence of bystander tagging unclear\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Pull-downs placed RAP-1 within a large shed MSP-1-associated merozoite surface complex, broadening its potential association network beyond the rhoptry RAP complexes.\",\n      \"evidence\": \"Co-immunoprecipitation with anti-MSP-1/anti-RhopH3 and tandem mass spectrometry of P. falciparum merozoite lysate\",\n      \"pmids\": [\"21175202\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Single pull-down without reciprocal or functional validation for RAP-1\", \"Direct versus indirect association with MSP-1 not distinguished\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Conditional knockdown redefined RAP-1's function: rather than being needed for invasion or rhoptry morphology, the RAP complex is required post-invasion for PVM integrity and intraerythrocytic growth.\",\n      \"evidence\": \"Conditional knockdown of RAP complex members in P. falciparum and P. berghei, PVM electron microscopy, parasitemia in mice\",\n      \"pmids\": [\"28205319\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular basis of RAP-1's PVM-stabilizing role unknown\", \"Whether RAP-1 acts directly at the PVM or via partners unresolved\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}, {\"species\": \"Plasmodium berghei\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Clean deletion in P. berghei established that RAP-1 targets RAP-2 to the rhoptries and modulates parasitemia kinetics and host survival, linking the protein to virulence.\",\n      \"evidence\": \"Genetic deletion of RAP-1 in P. berghei ANKA, IFA localization of RAP-2, mouse infection outcome monitoring\",\n      \"pmids\": [\"29307564\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism of RAP-2 targeting by RAP-1 not defined\", \"Basis for the paradoxical higher parasitemia yet prolonged survival unexplained\"],\n      \"attribution\": [{\"species\": \"Plasmodium berghei\", \"strain\": \"ANKA\"}]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How RAP-1 mechanistically stabilizes the PVM and what erythrocyte receptor mediates its bystander-binding activity remain unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No structural model of RAP-1 or the RAP complexes\", \"Direct molecular partners at the PVM unidentified\", \"Erythrocyte-surface ligand of RAP-1 unknown\"],\n      \"attribution\": []\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0005515\", \"supporting_discovery_ids\": [3, 5, 9]},\n      {\"term_id\": \"GO:0034185\", \"supporting_discovery_ids\": [6]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0020008\", \"supporting_discovery_ids\": [2, 3, 5]},\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [6, 7]},\n      {\"term_id\": \"GO:0020005\", \"supporting_discovery_ids\": [8]},\n      {\"term_id\": \"GO:0005783\", \"supporting_discovery_ids\": [2]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"GO:0016192\", \"supporting_discovery_ids\": [2]},\n      {\"term_id\": \"GO:0016485\", \"supporting_discovery_ids\": [1, 3]}\n    ],\n    \"complexes\": [\n      \"RAP-1/RAP-2 rhoptry complex\",\n      \"RAP-1/RAP-3 rhoptry complex\",\n      \"MSP-1-associated merozoite surface complex (RAP-1, RAP-2, MSP-3/6/7/9, RhopH1, RhopH3)\"\n    ],\n    \"partners\": [\n      \"RAP-2\",\n      \"RAP-3\"\n    ],\n    \"other_free_text\": [\n      \"Synthesized as ~84–86 kDa precursor (Pr86) with cleavable N-terminal signal peptide; matured sequentially to p82 then p67 [#2, #3].\",\n      \"Cleavage site near amino acid 190 with inhibitory epitopes (iB-1 N200–Y211, iB-2) immediately C-terminal [#1, #4].\",\n      \"Required for correct rhoptry targeting of RAP-2 in P. berghei [#9].\",\n      \"RAP complex knockdown alters PVM structure and delays intraerythrocytic growth without affecting invasion [#8].\",\n      \"Co-isolated matrix metalloproteinases are a human-serum artifact, not genuine RAP-1 partners [#10].\"\n    ]\n  }\n}","audit_flag":{"gene":"PF3D7_1355200","tier":"IDENTITY_CHECK","verdict":"identity unverified","subtype":"names_other_cards","uniprot_band":"","rules_fired":"R12","issue":"No cited paper names this card; 10 of 11 cited papers name other catalogue genes (PF3D7_1410400, PF3D7_0501500, PF3D7_0930300). The summary may describe one of those genes."},"strains":[{"strain":"Pf3D7","gene_id":"PF3D7_1355200","name":null,"product":"RAP protein, putative","uniprot_acc":null,"chromosome":null,"start_pos":null},{"strain":"PbANKA","gene_id":"PBANKA_1131700","name":null,"product":"RAP protein, putative","uniprot_acc":null,"chromosome":null,"start_pos":null},{"strain":"PkH","gene_id":"PKNH_1116700","name":null,"product":"RAP protein, putative","uniprot_acc":null,"chromosome":null,"start_pos":null}],"gene_symbol":"","evaluation":null}