{"gene":"PF3D7_1024600","run_date":"2026-09-08T12:51:28","timeline":{"discoveries":[{"year":1990,"finding":"RAP-1 (PF3D7_1024600) is a multi-component rhoptry antigen consisting of four major proteins (80, 65, 42, 40 kDa) and two minor proteins (77, 70 kDa); monoclonal antibodies against it inhibit parasite growth in vitro; the antigen is lipophilic and disulfide bonding plays an important role in its structure. Autocatalytic processing and immunological cross-reactivity suggest all components derive from the same precursor protein.","method":"Immunoaffinity purification, SDS-PAGE, Western blot, monoclonal antibody inhibition assay, gene sequencing","journal":"Molecular and biochemical parasitology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods (purification, inhibition assay, sequencing) in a single lab; foundational characterization paper","pmids":["2200961"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":1992,"finding":"Inhibitory monoclonal antibodies against RAP-1 map their epitopes to a region 10–20 amino acids C-terminal to the proteolytic cleavage site (at amino acid 190) responsible for processing of the 80-kDa form (p80) to the 65-kDa form (p65). The 65-kDa form (p65) is absent from purified merozoites, indicating its generation is associated with merozoite release rather than erythrocyte invasion.","method":"Beta-galactosidase fusion protein epitope mapping, synthetic peptide reactivity, Western blot, parasite growth inhibition assay","journal":"Molecular and biochemical parasitology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — epitope mapping by two orthogonal approaches (fusion proteins + synthetic peptides) with functional inhibition assay, single lab","pmids":["1279419"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":1995,"finding":"Transport of RAP-1 (p82) 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 product (p82). N-ethylmaleimide, which prevents transport vesicle fusion with Golgi membranes, irreversibly blocks Pr86 processing. In vitro translation indicates RAP-1 contains a cleavable N-terminal signal peptide and is initially synthesized as an ~84-kDa protein, suggesting an undetected protein modification occurs during maturation.","method":"Brefeldin A treatment, low-temperature block, N-ethylmaleimide treatment, in vitro translation, immunoprecipitation, metabolic labeling","journal":"Molecular and biochemical parasitology","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal pharmacological perturbations (BFA, low temperature, NEM) all converging on the same secretory-pathway mechanism, with in vitro translation supporting the signal peptide finding, in a single focused mechanistic study","pmids":["8719244"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":1998,"finding":"RAP-1 precursor Pr86 is processed to p82 and then to p67 by progressive removal of N-terminal epitopes in two sequential cleavage events within the rhoptries. Pr86 can form complexes containing RAP-2 product p39 and RAP-3 product p37, similar to complexes formed by mature p82/p67. Pr86 is present in rhoptries but not in segmenting schizonts or extracellular merozoites; p67 and p82 are the major forms in purified merozoites. Neither p67 nor p82 relocalize from rhoptries to the merozoite surface.","method":"Polyclonal and monoclonal antibody epitope mapping, immunoblot, size fractionation with brefeldin A, immunofluorescence, radiolabeling, purified merozoite analysis","journal":"Molecular and biochemical parasitology","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (epitope mapping, size fractionation, radiolabeling, IFA) in a single rigorous study establishing sequential processing and complex formation","pmids":["9574915"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":1998,"finding":"A second inhibitory B-cell epitope (iB-2) in RAP-1 was identified near the amino terminus of p67, distinct from the previously described iB-1 (N200TLTPLEELYPT211). Monoclonal antibody 1D6, which binds iB-2, inhibits parasite invasion of erythrocytes in vitro. Anti-iB-1 antibodies are immunogenic but not immunodominant and are not readily boosted upon reinfection in owl monkeys.","method":"Monoclonal antibody production, recombinant fusion protein epitope mapping, in vitro parasite invasion inhibition assay, owl monkey infection model","journal":"Infection and immunity","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional inhibition assay combined with epitope mapping, single lab","pmids":["9423886"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2007,"finding":"RAP-1 is the core component of two low-molecular-weight rhoptry complexes (RAP1/RAP2 and RAP1/RAP3) identified in detergent-resistant membranes (DRMs) of P. falciparum schizonts. RAP-1 predominates in high molecular weight species by blue native PAGE, suggesting it aggregates in larger complexes than previously anticipated.","method":"Detergent-resistant membrane purification, blue native PAGE, mass spectrometry","journal":"Molecular and biochemical parasitology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — BN-PAGE combined with mass spectrometry identification, single lab","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. Surface iodination experiments with RAP-1 gene-disruption mutant parasites demonstrated that RAP-1 is required for tagging of normal erythrocytes with rhoptry proteins after merozoite release.","method":"RAP-1 and RAP-3 gene-disruption mutant parasites, surface iodination experiments, antibody binding assays","journal":"The Journal of infectious diseases","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — gene disruption mutants with surface iodination providing functional evidence, single lab","pmids":["17624849"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2010,"finding":"Pull-down experiments using anti-PfMSP-1 or anti-PfRhopH3 antibodies from merozoite lysate co-isolated PfRAP-1 and PfRAP-2 along with MSP-3, MSP-6, MSP-7, MSP-9, RhopH3, and RhopH1, identifying RAP-1 as part of a larger MSP-1-associated complex on the merozoite surface at schizont/merozoite stages.","method":"Antibody pull-down from merozoite lysate, tandem mass spectrometry, Western blot","journal":"Journal of proteome research","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single co-immunoprecipitation/pull-down experiment with MS identification, single lab, no reciprocal validation specific to RAP-1","pmids":["21175202"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2017,"finding":"Conditional knockdown of RAP complex members (including RAP-1) in P. falciparum showed the RAP complex is not required for rhoptry morphology or erythrocyte invasion. Instead, post-invasion, the RAP complex is required for normal parasitophorous vacuolar membrane (PVM) structure and intra-erythrocytic parasite growth. RAP complex knockdown leads to altered PVM structure, delayed intra-erythrocytic growth, and reduced parasitaemias in infected mice.","method":"Conditional knockdown (DiCre or analogous system), electron microscopy of PVM, growth assays, mouse infection model","journal":"Cellular microbiology","confidence":"High","confidence_rationale":"Tier 2 / Strong — conditional genetic knockdown with multiple orthogonal phenotypic readouts (PVM ultrastructure, growth kinetics, in vivo parasitemia), replicated across P. falciparum and mouse model","pmids":["28205319"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2018,"finding":"In P. berghei, RAP1 is required for targeting of RAP2 to the rhoptries. RAP1-deficient P. berghei ANKA parasites showed increased parasitemia during early infection but prolonged host survival. RAP1 contributes to virulence, as its deletion reduces lethality.","method":"Gene disruption (knockout) in P. berghei ANKA, mouse infection model, comparative genomics/proteomics","journal":"Experimental parasitology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic knockout with in vivo phenotypic readout and functional (targeting) inference, single lab","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 non-covalent association, but these metalloproteinases originate from human serum used to cultivate P. falciparum in vitro rather than from the parasite itself.","method":"Co-isolation/co-purification, proteinase inhibitor panel, metal ion dose-response, immunoprecipitation with metalloproteinase-specific antisera, immunofluorescence","journal":"Biochimica et biophysica acta","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single co-isolation study establishing a NEGATIVE result (the metalloproteinases are from serum, not the parasite); limited mechanistic implication for RAP-1 itself","pmids":["1477099"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]}],"current_model":"PF3D7_1024600 (RAP-1) is synthesized in late schizonts as an ~84–86 kDa precursor bearing a cleavable N-terminal signal peptide; it is transported to the rhoptries via the classical secretory pathway (sensitive to brefeldin A, low temperature, and NEM), where it undergoes sequential N-terminal proteolytic cleavages to p82 and then p67, forming non-covalent complexes with RAP-2 and RAP-3; these complexes reside in the rhoptry bulb and, after erythrocyte invasion, localize to the parasitophorous vacuolar membrane (PVM) where they are required for normal PVM structure and intra-erythrocytic parasite growth rather than for invasion per se, and RAP-1 also mediates tagging of non-parasitized erythrocytes with rhoptry proteins upon merozoite release."},"narrative":{"mechanistic_narrative":"PF3D7_1024600 (RAP-1) is a rhoptry protein of Plasmodium falciparum that functions as the organizing core of low-molecular-weight rhoptry complexes and is required for normal parasitophorous vacuolar membrane (PVM) structure and intra-erythrocytic growth after invasion [PMID:28205319]. It is synthesized as an ~84–86 kDa precursor bearing a cleavable N-terminal signal peptide and is routed to the rhoptries through the classical secretory pathway, since brefeldin A, low temperature, and N-ethylmaleimide reversibly or irreversibly block processing of the precursor [PMID:8719244]. Within the rhoptries the precursor undergoes two sequential N-terminal proteolytic cleavages to p82 and then p67, and these forms assemble into non-covalent complexes with RAP-2 and RAP-3 [PMID:9574915, PMID:17553576]. Contrary to a role in invasion, conditional knockdown demonstrated that the RAP complex is dispensable for rhoptry morphology and erythrocyte invasion but is required post-invasion for normal PVM ultrastructure, growth kinetics, and in vivo parasitaemia [PMID:28205319]; RAP-1 also serves as the determinant that tags non-parasitized erythrocytes with rhoptry proteins upon merozoite release [PMID:17624849]. In P. berghei, RAP-1 is required to target RAP-2 to the rhoptries and contributes to virulence [PMID:29307564]. Monoclonal antibodies against RAP-1 inhibit parasite growth and invasion in vitro, mapping to defined B-cell epitopes near the processing sites [PMID:2200961, PMID:1279419, PMID:9423886].","teleology":[{"year":1990,"claim":"Establishing that RAP-1 is a multi-component, disulfide-linked rhoptry antigen whose components derive from a single precursor set the framework for all subsequent processing and complex studies.","evidence":"Immunoaffinity purification, SDS-PAGE, monoclonal antibody growth-inhibition assay and gene sequencing in P. falciparum","pmids":["2200961"],"confidence":"Medium","gaps":["Precise identity of each processed form not resolved","Molecular basis of growth inhibition by antibodies unknown"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":1992,"claim":"Mapping inhibitory antibody epitopes near the p80→p65 cleavage site linked the proteolytic processing to merozoite release and defined a functionally important region.","evidence":"Fusion-protein and synthetic-peptide epitope mapping with growth-inhibition assay in P. falciparum","pmids":["1279419"],"confidence":"Medium","gaps":["Identity of the protease responsible for cleavage unknown","Mechanism by which epitope binding inhibits growth unresolved"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":1992,"claim":"Determining that co-purifying metalloproteinases originate from human culture serum rather than the parasite excluded them from RAP-1's intrinsic biology.","evidence":"Co-isolation, proteinase inhibitor and metal-ion assays, immunoprecipitation in P. falciparum","pmids":["1477099"],"confidence":"Low","gaps":["Negative result; establishes only what is not part of the complex","Does not identify the parasite protease that processes RAP-1"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":1995,"claim":"Showing that precursor processing depends on the secretory pathway localized RAP-1 trafficking to the classical ER/Golgi route and defined a cleavable signal peptide.","evidence":"Brefeldin A, low-temperature and NEM blocks with in vitro translation and immunoprecipitation in P. falciparum","pmids":["8719244"],"confidence":"High","gaps":["Nature of the inferred additional post-translational modification undefined","Rhoptry-targeting signal not identified"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":1998,"claim":"Defining sequential Pr86→p82→p67 processing within the rhoptries and complex formation with RAP-2/RAP-3 established RAP-1's maturation and assembly pathway.","evidence":"Epitope mapping, size fractionation, radiolabeling and IFA on merozoites in P. falciparum","pmids":["9574915"],"confidence":"High","gaps":["Protease responsible for cleavages unidentified","Stoichiometry of the complexes unresolved"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":1998,"claim":"Identification of a second invasion-inhibitory epitope near p67 extended the functional antibody map of RAP-1.","evidence":"Monoclonal antibody 1D6, recombinant epitope mapping, invasion inhibition and owl monkey model in P. falciparum","pmids":["9423886"],"confidence":"Medium","gaps":["Mechanism of invasion inhibition not defined","Whether antibody effect reflects a native RAP-1 invasion function unclear"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2007,"claim":"Placing RAP-1 as the core of RAP1/RAP2 and RAP1/RAP3 complexes in detergent-resistant membranes refined the biochemical architecture of the rhoptry complexes.","evidence":"DRM purification, blue native PAGE and mass spectrometry in P. falciparum schizonts","pmids":["17553576"],"confidence":"Medium","gaps":["Composition of the larger high-molecular-weight species not fully defined","Functional consequence of membrane association unknown"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2007,"claim":"Gene-disruption plus surface iodination established that RAP-1 is required to tag non-parasitized erythrocytes with rhoptry proteins after merozoite release, revealing a role beyond the invading merozoite.","evidence":"RAP-1 and RAP-3 knockout parasites with surface iodination and antibody binding in P. falciparum","pmids":["17624849"],"confidence":"Medium","gaps":["Biological purpose of erythrocyte tagging unresolved","Receptor on the erythrocyte surface unidentified"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2010,"claim":"Co-isolation of RAP-1 with MSP-1-associated surface proteins raised the possibility of a broader merozoite-surface complex.","evidence":"Antibody pull-down from merozoite lysate with tandem MS in P. falciparum","pmids":["21175202"],"confidence":"Low","gaps":["Single pull-down without reciprocal validation specific to RAP-1","Direct versus indirect association not distinguished"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2017,"claim":"Conditional knockdown redefined RAP-1's essential role as post-invasion, showing it is required for normal PVM structure and intra-erythrocytic growth rather than for invasion or rhoptry morphology.","evidence":"Conditional knockdown, PVM electron microscopy, growth assays and mouse infection in P. falciparum","pmids":["28205319"],"confidence":"High","gaps":["Molecular mechanism linking RAP-1 to PVM integrity unknown","How the complex functions at the PVM undefined"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2018,"claim":"Knockout in P. berghei demonstrated a conserved requirement for RAP-1 in targeting RAP-2 to the rhoptries and a contribution to virulence.","evidence":"Gene knockout in P. berghei ANKA with mouse infection and comparative proteomics","pmids":["29307564"],"confidence":"Medium","gaps":["Mechanism by which RAP-1 confers virulence unresolved","Relationship of the increased early parasitemia to PVM function unclear"],"attribution":[{"species":"Plasmodium berghei","strain":"ANKA"}]},{"year":null,"claim":"The protease(s) executing RAP-1 processing and the molecular mechanism by which RAP-1 maintains PVM integrity remain unidentified.","evidence":"","pmids":[],"confidence":"High","gaps":["Processing protease unidentified","Direct molecular partners at the PVM undefined","Structural basis of complex assembly unknown"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]}],"mechanism_profile":{"molecular_activity":[],"localization":[],"pathway":[],"complexes":["RAP1/RAP2 low-molecular-weight rhoptry complex","RAP1/RAP3 low-molecular-weight rhoptry complex","MSP-1-associated merozoite surface complex (RAP-1/RAP-2 with MSP-3/6/7/9, RhopH3, RhopH1)"],"partners":["RAP-2 (RAP-2 PRODUCT P39)","RAP-3 (RAP-3 PRODUCT P37)","MSP-1","RHOPH3"],"other_free_text":["Synthesized as ~84–86 kDa precursor (Pr86) with cleavable N-terminal signal peptide, processed sequentially to p82 then p67 [#2, #3]","Trafficked via classical secretory pathway; processing blocked by brefeldin A, low temperature and NEM [#2]","Required post-invasion for normal parasitophorous vacuolar membrane structure and intra-erythrocytic growth [#8]","Required for tagging of non-parasitized erythrocytes with rhoptry proteins after merozoite release [#6]","In P. berghei, required for targeting RAP-2 to the rhoptries and contributes to virulence [#9]","Target of growth- and invasion-inhibitory monoclonal antibodies mapping to defined B-cell epitopes [#0, #1, #4]","Co-isolating human-serum metalloproteinases are not parasite-derived [#10]"]}},"prefetch_data":{},"corpus_meta":[{"pmid":"7838184","id":"PMC_7838184","title":"Differential localization of full-length and processed forms of PF83/AMA-1 an apical membrane antigen of Plasmodium falciparum merozoites.","date":"1994","source":"Molecular and biochemical 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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 isolates from Malaysia.","date":"2016","source":"Malaria journal","url":"https://pubmed.ncbi.nlm.nih.gov/26847346","citation_count":12,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["RAP","PfRAP"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"9715934","id":"PMC_9715934","title":"A study of antibody and T cell recognition of rhoptry-associated protein-1 (RAP-1) and RAP-2 recombinant proteins and peptides of Plasmodium falciparum in migrants and residents of the state of Rondonia, Brazil.","date":"1998","source":"The American journal of tropical medicine and hygiene","url":"https://pubmed.ncbi.nlm.nih.gov/9715934","citation_count":12,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["RAP"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"21226723","id":"PMC_21226723","title":"Antibodies to the Plasmodium falciparum rhoptry 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acta","url":"https://pubmed.ncbi.nlm.nih.gov/1477099","citation_count":1,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["RAP"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":22871,"output_tokens":3388,"usd":0.059716,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":18049,"output_tokens":8226,"usd":0.22197,"resynth_parse_fail":true},"total_usd":0.281686,"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\": 1990,\n      \"finding\": \"RAP-1 (PF3D7_1024600) is a multi-component rhoptry antigen consisting of four major proteins (80, 65, 42, 40 kDa) and two minor proteins (77, 70 kDa); monoclonal antibodies against it inhibit parasite growth in vitro; the antigen is lipophilic and disulfide bonding plays an important role in its structure. Autocatalytic processing and immunological cross-reactivity suggest all components derive from the same precursor protein.\",\n      \"method\": \"Immunoaffinity purification, SDS-PAGE, Western blot, monoclonal antibody inhibition assay, gene sequencing\",\n      \"journal\": \"Molecular and biochemical parasitology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods (purification, inhibition assay, sequencing) in a single lab; foundational characterization paper\",\n      \"pmids\": [\"2200961\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 1992,\n      \"finding\": \"Inhibitory monoclonal antibodies against RAP-1 map their epitopes to a region 10–20 amino acids C-terminal to the proteolytic cleavage site (at amino acid 190) responsible for processing of the 80-kDa form (p80) to the 65-kDa form (p65). The 65-kDa form (p65) is absent from purified merozoites, indicating its generation is associated with merozoite release rather than erythrocyte invasion.\",\n      \"method\": \"Beta-galactosidase fusion protein epitope mapping, synthetic peptide reactivity, Western blot, parasite growth inhibition assay\",\n      \"journal\": \"Molecular and biochemical parasitology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — epitope mapping by two orthogonal approaches (fusion proteins + synthetic peptides) with 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 RAP-1 (p82) 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 product (p82). N-ethylmaleimide, which prevents transport vesicle fusion with Golgi membranes, irreversibly blocks Pr86 processing. In vitro translation indicates RAP-1 contains a cleavable N-terminal signal peptide and is initially synthesized as an ~84-kDa protein, suggesting an undetected protein modification occurs during maturation.\",\n      \"method\": \"Brefeldin A treatment, low-temperature block, N-ethylmaleimide treatment, in vitro translation, immunoprecipitation, metabolic labeling\",\n      \"journal\": \"Molecular and biochemical parasitology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal pharmacological perturbations (BFA, low temperature, NEM) all converging on the same secretory-pathway mechanism, with in vitro translation supporting the signal peptide finding, in a single focused mechanistic study\",\n      \"pmids\": [\"8719244\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"RAP-1 precursor Pr86 is processed to p82 and then to p67 by progressive removal of N-terminal epitopes in two sequential cleavage events within the rhoptries. Pr86 can form complexes containing RAP-2 product p39 and RAP-3 product p37, similar to complexes formed by mature p82/p67. Pr86 is present in rhoptries but not in segmenting schizonts or extracellular merozoites; p67 and p82 are the major forms in purified merozoites. Neither p67 nor p82 relocalize from rhoptries to the merozoite surface.\",\n      \"method\": \"Polyclonal and monoclonal antibody epitope mapping, immunoblot, size fractionation with brefeldin A, immunofluorescence, radiolabeling, purified merozoite analysis\",\n      \"journal\": \"Molecular and biochemical parasitology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (epitope mapping, size fractionation, radiolabeling, IFA) in a single rigorous study establishing sequential processing and complex formation\",\n      \"pmids\": [\"9574915\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"A second inhibitory B-cell epitope (iB-2) in RAP-1 was identified near the amino terminus of p67, distinct from the previously described iB-1 (N200TLTPLEELYPT211). Monoclonal antibody 1D6, which binds iB-2, inhibits parasite invasion of erythrocytes in vitro. Anti-iB-1 antibodies are immunogenic but not immunodominant and are not readily boosted upon reinfection in owl monkeys.\",\n      \"method\": \"Monoclonal antibody production, recombinant fusion protein epitope mapping, in vitro parasite invasion inhibition assay, owl monkey infection model\",\n      \"journal\": \"Infection and immunity\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional inhibition assay combined with epitope mapping, 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 the core component of two low-molecular-weight rhoptry complexes (RAP1/RAP2 and RAP1/RAP3) identified in detergent-resistant membranes (DRMs) of P. falciparum schizonts. RAP-1 predominates in high molecular weight species by blue native PAGE, suggesting it aggregates in larger complexes than previously anticipated.\",\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 / Moderate — BN-PAGE combined with mass spectrometry identification, single lab\",\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. Surface iodination experiments with RAP-1 gene-disruption mutant parasites demonstrated that RAP-1 is required for tagging of normal erythrocytes with rhoptry proteins after merozoite release.\",\n      \"method\": \"RAP-1 and RAP-3 gene-disruption mutant parasites, surface iodination experiments, antibody binding assays\",\n      \"journal\": \"The Journal of infectious diseases\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — gene disruption mutants with surface iodination providing functional evidence, single lab\",\n      \"pmids\": [\"17624849\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Pull-down experiments using anti-PfMSP-1 or anti-PfRhopH3 antibodies from merozoite lysate co-isolated PfRAP-1 and PfRAP-2 along with MSP-3, MSP-6, MSP-7, MSP-9, RhopH3, and RhopH1, identifying RAP-1 as part of a larger MSP-1-associated complex on the merozoite surface at schizont/merozoite stages.\",\n      \"method\": \"Antibody pull-down from merozoite lysate, tandem mass spectrometry, Western blot\",\n      \"journal\": \"Journal of proteome research\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single co-immunoprecipitation/pull-down experiment with MS identification, single lab, no reciprocal validation specific to RAP-1\",\n      \"pmids\": [\"21175202\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"Conditional knockdown of RAP complex members (including RAP-1) in P. falciparum showed the RAP complex is not required for rhoptry morphology or erythrocyte invasion. Instead, post-invasion, the RAP complex is required for normal parasitophorous vacuolar membrane (PVM) structure and intra-erythrocytic parasite growth. RAP complex knockdown leads to altered PVM structure, delayed intra-erythrocytic growth, and reduced parasitaemias in infected mice.\",\n      \"method\": \"Conditional knockdown (DiCre or analogous system), electron microscopy of PVM, growth assays, mouse infection model\",\n      \"journal\": \"Cellular microbiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — conditional genetic knockdown with multiple orthogonal phenotypic readouts (PVM ultrastructure, growth kinetics, in vivo parasitemia), replicated across P. falciparum and mouse model\",\n      \"pmids\": [\"28205319\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"In P. berghei, RAP1 is required for targeting of RAP2 to the rhoptries. RAP1-deficient P. berghei ANKA parasites showed increased parasitemia during early infection but prolonged host survival. RAP1 contributes to virulence, as its deletion reduces lethality.\",\n      \"method\": \"Gene disruption (knockout) in P. berghei ANKA, mouse infection model, comparative genomics/proteomics\",\n      \"journal\": \"Experimental parasitology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic knockout with in vivo phenotypic readout and functional (targeting) inference, single lab\",\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 non-covalent association, but these metalloproteinases originate from human serum used to cultivate P. falciparum in vitro rather than from the parasite itself.\",\n      \"method\": \"Co-isolation/co-purification, proteinase inhibitor panel, metal ion dose-response, immunoprecipitation with metalloproteinase-specific antisera, immunofluorescence\",\n      \"journal\": \"Biochimica et biophysica acta\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single co-isolation study establishing a NEGATIVE result (the metalloproteinases are from serum, not the parasite); limited mechanistic implication for RAP-1 itself\",\n      \"pmids\": [\"1477099\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    }\n  ],\n  \"current_model\": \"PF3D7_1024600 (RAP-1) is synthesized in late schizonts as an ~84–86 kDa precursor bearing a cleavable N-terminal signal peptide; it is transported to the rhoptries via the classical secretory pathway (sensitive to brefeldin A, low temperature, and NEM), where it undergoes sequential N-terminal proteolytic cleavages to p82 and then p67, forming non-covalent complexes with RAP-2 and RAP-3; these complexes reside in the rhoptry bulb and, after erythrocyte invasion, localize to the parasitophorous vacuolar membrane (PVM) where they are required for normal PVM structure and intra-erythrocytic parasite growth rather than for invasion per se, and RAP-1 also mediates tagging of non-parasitized erythrocytes with rhoptry proteins upon merozoite release.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"PF3D7_1024600 (RAP-1) is a rhoptry protein of Plasmodium falciparum that functions as the organizing core of low-molecular-weight rhoptry complexes and is required for normal parasitophorous vacuolar membrane (PVM) structure and intra-erythrocytic growth after invasion [#8]. It is synthesized as an ~84–86 kDa precursor bearing a cleavable N-terminal signal peptide and is routed to the rhoptries through the classical secretory pathway, since brefeldin A, low temperature, and N-ethylmaleimide reversibly or irreversibly block processing of the precursor [#2]. Within the rhoptries the precursor undergoes two sequential N-terminal proteolytic cleavages to p82 and then p67, and these forms assemble into non-covalent complexes with RAP-2 and RAP-3 [#3, #5]. Contrary to a role in invasion, conditional knockdown demonstrated that the RAP complex is dispensable for rhoptry morphology and erythrocyte invasion but is required post-invasion for normal PVM ultrastructure, growth kinetics, and in vivo parasitaemia [#8]; RAP-1 also serves as the determinant that tags non-parasitized erythrocytes with rhoptry proteins upon merozoite release [#6]. In P. berghei, RAP-1 is required to target RAP-2 to the rhoptries and contributes to virulence [#9]. Monoclonal antibodies against RAP-1 inhibit parasite growth and invasion in vitro, mapping to defined B-cell epitopes near the processing sites [#0, #1, #4].\"\n  ,\n  \"teleology\": [\n    {\n      \"year\": 1990,\n      \"claim\": \"Establishing that RAP-1 is a multi-component, disulfide-linked rhoptry antigen whose components derive from a single precursor set the framework for all subsequent processing and complex studies.\",\n      \"evidence\": \"Immunoaffinity purification, SDS-PAGE, monoclonal antibody growth-inhibition assay and gene sequencing in P. falciparum\",\n      \"pmids\": [\"2200961\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Precise identity of each processed form not resolved\", \"Molecular basis of growth inhibition by antibodies unknown\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 1992,\n      \"claim\": \"Mapping inhibitory antibody epitopes near the p80\\u2192p65 cleavage site linked the proteolytic processing to merozoite release and defined a functionally important region.\",\n      \"evidence\": \"Fusion-protein and synthetic-peptide epitope mapping with growth-inhibition assay in P. falciparum\",\n      \"pmids\": [\"1279419\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Identity of the protease responsible for cleavage unknown\", \"Mechanism by which epitope binding inhibits growth unresolved\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 1992,\n      \"claim\": \"Determining that co-purifying metalloproteinases originate from human culture serum rather than the parasite excluded them from RAP-1's intrinsic biology.\",\n      \"evidence\": \"Co-isolation, proteinase inhibitor and metal-ion assays, immunoprecipitation in P. falciparum\",\n      \"pmids\": [\"1477099\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Negative result; establishes only what is not part of the complex\", \"Does not identify the parasite protease that processes RAP-1\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 1995,\n      \"claim\": \"Showing that precursor processing depends on the secretory pathway localized RAP-1 trafficking to the classical ER/Golgi route and defined a cleavable signal peptide.\",\n      \"evidence\": \"Brefeldin A, low-temperature and NEM blocks with in vitro translation and immunoprecipitation in P. falciparum\",\n      \"pmids\": [\"8719244\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Nature of the inferred additional post-translational modification undefined\", \"Rhoptry-targeting signal not identified\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 1998,\n      \"claim\": \"Defining sequential Pr86\\u2192p82\\u2192p67 processing within the rhoptries and complex formation with RAP-2/RAP-3 established RAP-1's maturation and assembly pathway.\",\n      \"evidence\": \"Epitope mapping, size fractionation, radiolabeling and IFA on merozoites in P. falciparum\",\n      \"pmids\": [\"9574915\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Protease responsible for cleavages unidentified\", \"Stoichiometry of the complexes unresolved\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 1998,\n      \"claim\": \"Identification of a second invasion-inhibitory epitope near p67 extended the functional antibody map of RAP-1.\",\n      \"evidence\": \"Monoclonal antibody 1D6, recombinant epitope mapping, invasion inhibition and owl monkey model in P. falciparum\",\n      \"pmids\": [\"9423886\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism of invasion inhibition not defined\", \"Whether antibody effect reflects a native RAP-1 invasion function unclear\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Placing RAP-1 as the core of RAP1/RAP2 and RAP1/RAP3 complexes in detergent-resistant membranes refined the biochemical architecture of the rhoptry complexes.\",\n      \"evidence\": \"DRM purification, blue native PAGE and mass spectrometry in P. falciparum schizonts\",\n      \"pmids\": [\"17553576\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Composition of the larger high-molecular-weight species not fully defined\", \"Functional consequence of membrane association unknown\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Gene-disruption plus surface iodination established that RAP-1 is required to tag non-parasitized erythrocytes with rhoptry proteins after merozoite release, revealing a role beyond the invading merozoite.\",\n      \"evidence\": \"RAP-1 and RAP-3 knockout parasites with surface iodination and antibody binding in P. falciparum\",\n      \"pmids\": [\"17624849\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Biological purpose of erythrocyte tagging unresolved\", \"Receptor on the erythrocyte surface unidentified\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Co-isolation of RAP-1 with MSP-1-associated surface proteins raised the possibility of a broader merozoite-surface complex.\",\n      \"evidence\": \"Antibody pull-down from merozoite lysate with tandem MS in P. falciparum\",\n      \"pmids\": [\"21175202\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Single pull-down without reciprocal validation specific to RAP-1\", \"Direct versus indirect association not distinguished\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Conditional knockdown redefined RAP-1's essential role as post-invasion, showing it is required for normal PVM structure and intra-erythrocytic growth rather than for invasion or rhoptry morphology.\",\n      \"evidence\": \"Conditional knockdown, PVM electron microscopy, growth assays and mouse infection in P. falciparum\",\n      \"pmids\": [\"28205319\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular mechanism linking RAP-1 to PVM integrity unknown\", \"How the complex functions at the PVM undefined\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Knockout in P. berghei demonstrated a conserved requirement for RAP-1 in targeting RAP-2 to the rhoptries and a contribution to virulence.\",\n      \"evidence\": \"Gene knockout in P. berghei ANKA with mouse infection and comparative proteomics\",\n      \"pmids\": [\"29307564\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism by which RAP-1 confers virulence unresolved\", \"Relationship of the increased early parasitemia to PVM function unclear\"],\n      \"attribution\": [{\"species\": \"Plasmodium berghei\", \"strain\": \"ANKA\"}]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The protease(s) executing RAP-1 processing and the molecular mechanism by which RAP-1 maintains PVM integrity remain unidentified.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Processing protease unidentified\", \"Direct molecular partners at the PVM undefined\", \"Structural basis of complex assembly unknown\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [],\n    \"localization\": [\n      {\"term_id\": \"GO:0020008\", \"supporting_discovery_ids\": [0, 3, 5]},\n      {\"term_id\": \"GO:0020002\", \"supporting_discovery_ids\": [6]},\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [7]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"GO:0006886\", \"supporting_discovery_ids\": [2]},\n      {\"term_id\": \"GO:0016485\", \"supporting_discovery_ids\": [3]}\n    ],\n    \"complexes\": [\n      \"RAP1/RAP2 low-molecular-weight rhoptry complex\",\n      \"RAP1/RAP3 low-molecular-weight rhoptry complex\",\n      \"MSP-1-associated merozoite surface complex (RAP-1/RAP-2 with MSP-3/6/7/9, RhopH3, RhopH1)\"\n    ],\n    \"partners\": [\n      \"RAP-2 (RAP-2 product p39)\",\n      \"RAP-3 (RAP-3 product p37)\",\n      \"MSP-1\",\n      \"RhopH3\"\n    ],\n    \"other_free_text\": [\n      \"Synthesized as ~84\\u201386 kDa precursor (Pr86) with cleavable N-terminal signal peptide, processed sequentially to p82 then p67 [#2, #3]\",\n      \"Trafficked via classical secretory pathway; processing blocked by brefeldin A, low temperature and NEM [#2]\",\n      \"Required post-invasion for normal parasitophorous vacuolar membrane structure and intra-erythrocytic growth [#8]\",\n      \"Required for tagging of non-parasitized erythrocytes with rhoptry proteins after merozoite release [#6]\",\n      \"In P. berghei, required for targeting RAP-2 to the rhoptries and contributes to virulence [#9]\",\n      \"Target of growth- and invasion-inhibitory monoclonal antibodies mapping to defined B-cell epitopes [#0, #1, #4]\",\n      \"Co-isolating human-serum metalloproteinases are not parasite-derived [#10]\"\n    ]\n  }\n}","audit_flag":{"gene":"PF3D7_1024600","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_1024600","name":null,"product":"RAP protein, putative","uniprot_acc":null,"chromosome":null,"start_pos":null},{"strain":"PbANKA","gene_id":"PBANKA_0508800","name":null,"product":"RAP protein, putative","uniprot_acc":null,"chromosome":null,"start_pos":null},{"strain":"PkH","gene_id":"PKNH_0609100","name":null,"product":"RAP protein, putative","uniprot_acc":null,"chromosome":null,"start_pos":null}],"gene_symbol":"","evaluation":null}