{"gene":"PF3D7_1123600","run_date":"2026-09-08T12:51:28","timeline":{"discoveries":[{"year":1990,"finding":"RAP-1 is a rhoptry-localized antigen of P. falciparum consisting of multiple protein components (80, 65, 42, 40 kDa major and 77, 70 kDa minor) derived from the same precursor, is lipophilic, contains disulfide bonds important for its structure, and monoclonal antibodies against it inhibit parasite growth in vitro.","method":"Immunoaffinity purification, SDS-PAGE, Western blot, autocatalytic processing analysis, monoclonal antibody inhibition assays, gene sequencing","journal":"Molecular and biochemical parasitology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods (biochemical purification, in vitro growth inhibition, sequence analysis) in a single lab","pmids":["2200961"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":1992,"finding":"Inhibitory monoclonal antibodies against RAP-1 recognize linear epitopes mapping 10-20 amino acids C-terminal to the proteolytic cleavage site (at amino acid 190) that converts the 80-kDa form (p80) to the 65-kDa form (p65). The 65-kDa processing product is absent from purified merozoites, suggesting its generation is associated with merozoite release rather than erythrocyte invasion.","method":"Epitope mapping with beta-galactosidase fusion proteins and synthetic peptides, Western blot, in vitro parasite growth inhibition assay","journal":"Molecular and biochemical parasitology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods (fusion protein epitope mapping, synthetic peptides, growth inhibition), single lab","pmids":["1279419"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":1995,"finding":"Transport of RAP-1 to the rhoptries is regulated by the secretory pathway. Brefeldin A (BFA) and low temperature reversibly block processing of an 86-kDa precursor (Pr86) to the mature 82-kDa RAP-1 product (p82). N-ethylmaleimide (which prevents vesicle-Golgi fusion) irreversibly blocks this processing. In vitro translation reveals a cleavable N-terminal signal peptide and an initial 84-kDa primary translation product, suggesting RAP-1 acquires an undetected protein modification during maturation.","method":"Brefeldin A and low-temperature blockade experiments on intact cells, N-ethylmaleimide treatment, in vitro translation, immunoblot","journal":"Molecular and biochemical parasitology","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple pharmacological perturbations (BFA, low temperature, NEM) with defined biochemical readout, in vitro translation confirmation, focused study on this protein's trafficking","pmids":["8719244"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":1998,"finding":"RAP-1 precursor Pr86 undergoes two sequential N-terminal cleavages: first to p82 (rapid, in rhoptries) then to p67 (delayed, also in rhoptries). Pr86 can form complexes with RAP-2 product p39 and RAP-3 product p37 prior to processing. p82 and p67 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 play a role in a narrow window during merozoite invasion.","method":"Immunoblot with epitope-selective antibodies, size fractionation of BFA-treated radiolabeled parasites, immunofluorescence localization","journal":"Molecular and biochemical parasitology","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (epitope mapping, BFA pulse-chase, immunofluorescence, co-fractionation) establishing processing pathway and complex formation","pmids":["9574915"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":1998,"finding":"A second inhibitory B-cell epitope (iB-2) was identified in RAP-1 near the amino terminus of p67, distinct from the previously characterized iB-1 (N200TLTPLEELYPT211). Monoclonal antibody 1D6 binds iB-2 and inhibits parasite invasion of erythrocytes in vitro. Anti-iB-1 antibodies were produced during infection but not readily boosted upon reinfection, suggesting iB-1 is immunogenic but not immunodominant.","method":"Owl monkey infection model, monoclonal antibody production, in vitro erythrocyte invasion inhibition assay, peptide epitope mapping","journal":"Infection and immunity","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vitro invasion inhibition with defined epitope mapping, single lab, multiple methods","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 (RAP1/2 and RAP1/3) and is enriched in detergent-resistant membranes (DRMs) of P. falciparum schizonts. RAP-1 predominates in high-molecular-weight species by blue native PAGE, suggesting its participation in complexes larger than 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 plus mass spectrometry identification, single lab, focused biochemical characterization","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. Parasites with RAP-1 gene disruption lose their capacity to tag erythrocytes with rhoptry-derived proteins, implicating RAP-1 in the transfer of rhoptry material to bystander erythrocytes.","method":"Gene disruption (RAP-1 and RAP-3 knock-out mutants), surface iodination experiments, binding assays with normal erythrocytes","journal":"The Journal of infectious diseases","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic knockout with direct biochemical readout (surface iodination), comparison between RAP-1 and RAP-3 mutants providing specificity control","pmids":["17624849"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2010,"finding":"RAP-1 is pulled down as part of the PfMSP-1 surface complex on merozoites, together with RAP-2 and two RAP-domain-containing proteins; this complex is present at the schizont/merozoite stage but not in the subsequent ring stage and is shed into culture supernatant.","method":"Antibody pull-down from merozoite lysate, tandem mass spectrometry identification","journal":"Journal of proteome research","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single pull-down/MS experiment, no reciprocal validation specific to RAP-1","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, but is required post-invasion for normal parasitophorous vacuolar membrane (PVM) structure and intra-erythrocytic parasite growth. Conditional knockdown of RAP complex members leads to altered PVM structure, delayed intra-erythrocytic growth, and reduced parasitaemias in infected mice.","method":"Conditional knockdown (inducible system), electron microscopy of PVM structure, parasite growth assays, mouse infection model","journal":"Cellular microbiology","confidence":"High","confidence_rationale":"Tier 2 / Strong — conditional knockdown with multiple orthogonal phenotypic readouts (PVM ultrastructure, in vitro growth, in vivo parasitemia), clear post-invasion role established","pmids":["28205319"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""},{"species":"Plasmodium berghei","strain":"ANKA"}]},{"year":2018,"finding":"In P. berghei, RAP-1 is required for targeting of RAP-2 to the rhoptries. RAP1-deficient P. berghei ANKA parasites show increased parasitemia during early infection but reduced virulence (mice survive longer), establishing RAP-1 as a contributor to parasite virulence.","method":"Genetic disruption of RAP1 in P. berghei ANKA, mouse infection experiments measuring parasitemia and survival","journal":"Experimental parasitology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic knockout with in vivo phenotypic readout and functional consequence (RAP-2 mislocalization), 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 immunoaffinity chromatography but originate from human serum used to cultivate P. falciparum in vitro (not from the parasite itself), as confirmed by the absence of immunofluorescence staining of intracellular parasites with metalloproteinase-specific antisera.","method":"Co-isolation by immunoaffinity chromatography, proteinase inhibitor profiling, immunoprecipitation with monospecific antisera, indirect immunofluorescence","journal":"Biochimica et biophysica acta","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — negative result rigorously established by multiple orthogonal methods (co-isolation, IFA, immunoprecipitation) showing the metalloproteinases are serum contaminants not parasite proteins","pmids":["1477099"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]}],"current_model":"PF3D7_1123600 (RAP-1) is a rhoptry bulb protein of P. falciparum that is synthesized as an ~84–86 kDa precursor, processed via the secretory pathway (requiring Golgi-dependent vesicle trafficking) through sequential N-terminal cleavages first to p82 then to p67 within the rhoptries, forms stable complexes with RAP-2 and RAP-3, binds to the surface of normal erythrocytes (dependent on RAP-1 but not RAP-3), is dispensable for erythrocyte invasion per se but is essential post-invasion for parasitophorous vacuolar membrane integrity and intra-erythrocytic parasite growth, and in P. berghei is required to target RAP-2 to the rhoptries and contributes to parasite virulence."},"narrative":{"mechanistic_narrative":"PF3D7_1123600 (RAP-1) is a rhoptry bulb protein of Plasmodium falciparum that serves as the organizing core of low-molecular-weight rhoptry protein complexes and acts post-invasion to support intra-erythrocytic parasite development [PMID:17553576, PMID:28205319]. It is synthesized as an ~84–86 kDa precursor bearing a cleavable N-terminal signal peptide and is trafficked to the rhoptries via the secretory pathway: processing of the 86-kDa precursor to the mature p82 form is reversibly blocked by brefeldin A and low temperature and irreversibly blocked by N-ethylmaleimide, indicating dependence on Golgi-associated vesicular fusion [PMID:8719244]. Within the rhoptries the precursor undergoes two sequential N-terminal cleavages, first a rapid conversion to p82 and then a delayed conversion to p67, and the precursor can assemble with the RAP-2 and RAP-3 products before processing [PMID:9574915]. RAP-1 is the core component of the RAP1/2 and RAP1/3 complexes and is enriched in detergent-resistant membranes of schizonts [PMID:17553576]. RAP-1 and RAP-2, but not RAP-3, bind the surface of normal erythrocytes, and disruption of RAP-1 abolishes the parasite's ability to tag bystander erythrocytes with rhoptry-derived material [PMID:17624849]. The RAP complex is dispensable for rhoptry morphology and erythrocyte invasion but is required for normal parasitophorous vacuolar membrane structure and for intra-erythrocytic growth; conditional knockdown produces altered PVM ultrastructure, delayed growth, and reduced parasitaemia in mice [PMID:28205319]. In P. berghei, RAP-1 is required to target RAP-2 to the rhoptries and contributes to virulence, as RAP1-deficient parasites show reduced lethality [PMID:29307564]. Monoclonal antibodies against RAP-1 epitopes inhibit parasite growth and invasion in vitro [PMID:2200961, PMID:1279419, PMID:9423886].","teleology":[{"year":1990,"claim":"Established RAP-1 as a rhoptry antigen and defined its biochemical character, answering whether it is a single molecule or a processed multi-component antigen and whether it is a plausible growth-inhibition target.","evidence":"Immunoaffinity purification, SDS-PAGE, autocatalytic processing analysis and monoclonal antibody growth inhibition in P. falciparum","pmids":["2200961"],"confidence":"Medium","gaps":["Precursor size and trafficking route not yet resolved","Molecular function of the protein not defined","Relationship of the multiple bands to a defined processing pathway unclear"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":1992,"claim":"Mapped inhibitory antibody epitopes relative to the p80-to-p65 cleavage site and linked p65 generation to merozoite release rather than invasion, connecting processing to the parasite life-cycle stage.","evidence":"Epitope mapping with fusion proteins and synthetic peptides plus growth inhibition in P. falciparum","pmids":["1279419"],"confidence":"Medium","gaps":["Enzyme responsible for cleavage not identified","Functional consequence of processing for the protein's activity unknown"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":1992,"claim":"Resolved whether metalloproteinases co-purifying with the RAP-1 complex were parasite-derived, ruling them out as bona fide RAP-1 partners.","evidence":"Co-isolation, proteinase inhibitor profiling, immunoprecipitation and immunofluorescence in P. falciparum","pmids":["1477099"],"confidence":"Medium","gaps":["Does not identify authentic parasite-derived interactors of RAP-1"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":1995,"claim":"Defined the trafficking route of RAP-1, showing precursor-to-mature processing depends on the secretory pathway and Golgi-associated vesicle fusion.","evidence":"Brefeldin A, low-temperature and N-ethylmaleimide blockade with in vitro translation and immunoblot in P. falciparum","pmids":["8719244"],"confidence":"High","gaps":["Identity of the inferred post-translational modification not determined","Protease(s) mediating rhoptry processing unknown"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":1998,"claim":"Established the ordered two-step processing pathway (Pr86 to p82 to p67) and showed precursor assembly with RAP-2 and RAP-3 products precedes processing, defining when complexes form.","evidence":"Epitope-selective immunoblot, BFA pulse-chase co-fractionation and immunofluorescence in P. falciparum","pmids":["9574915"],"confidence":"High","gaps":["Functional role of p67-specific window during invasion not directly tested","Stoichiometry of the RAP complexes unresolved"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":1998,"claim":"Identified a second inhibitory epitope near the p67 N-terminus, extending the map of functionally important, antibody-accessible regions of RAP-1.","evidence":"Owl monkey infection, monoclonal antibody 1D6, in vitro invasion inhibition and peptide mapping in P. falciparum","pmids":["9423886"],"confidence":"Medium","gaps":["Mechanism by which antibody binding inhibits invasion not defined","Native function of the iB-2 region unknown"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2007,"claim":"Positioned RAP-1 as the core of the RAP1/2 and RAP1/3 complexes and localized it to detergent-resistant membranes, framing its role as a scaffolding/complex-organizing component.","evidence":"Detergent-resistant membrane 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 identified","Molecular basis of DRM association unknown"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2007,"claim":"Used gene disruption to demonstrate RAP-1 is required for transfer of rhoptry-derived protein onto bystander erythrocyte surfaces, assigning a specific function distinct from RAP-3.","evidence":"RAP-1 and RAP-3 knockouts with surface iodination and erythrocyte binding assays in P. falciparum","pmids":["17624849"],"confidence":"High","gaps":["Biological purpose of tagging bystander erythrocytes not established","Direct receptor on the erythrocyte surface not identified"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2010,"claim":"Placed RAP-1 within the MSP-1 merozoite surface complex, indicating a stage-restricted association that is shed before the ring stage.","evidence":"Antibody pull-down from merozoite lysate with tandem mass spectrometry in P. falciparum","pmids":["21175202"],"confidence":"Low","gaps":["Single pull-down/MS without reciprocal validation specific to RAP-1","Direct versus indirect nature of the MSP-1 association unresolved"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2017,"claim":"Defined the essential post-invasion role of the RAP complex, showing RAP-1 is dispensable for invasion but required for PVM integrity and intra-erythrocytic growth.","evidence":"Conditional knockdown with PVM electron microscopy, growth assays and mouse infection in P. falciparum and P. berghei ANKA","pmids":["28205319"],"confidence":"High","gaps":["Molecular mechanism by which RAP complex supports PVM structure unknown","Direct RAP-1 contribution versus whole-complex effect not separated"],"attribution":[{"species":"Plasmodium falciparum","strain":""},{"species":"Plasmodium berghei","strain":"ANKA"}]},{"year":2018,"claim":"Showed in a rodent model that RAP-1 targets RAP-2 to the rhoptries and contributes to virulence, linking complex assembly to disease outcome.","evidence":"Genetic disruption of RAP1 in P. berghei ANKA with parasitemia and survival measurements","pmids":["29307564"],"confidence":"Medium","gaps":["Whether RAP-1 targets RAP-2 identically in P. falciparum not tested here","Mechanism connecting RAP-2 mislocalization to virulence undefined"],"attribution":[{"species":"Plasmodium berghei","strain":"ANKA"}]},{"year":null,"claim":"The biochemical/molecular activity of RAP-1 itself and the mechanism by which the RAP complex maintains PVM integrity remain unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No defined enzymatic or ligand-binding activity for RAP-1","Protease(s) mediating rhoptry processing not identified","Mechanistic basis of PVM defect in RAP-deficient parasites unknown"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]}],"mechanism_profile":{"molecular_activity":[],"localization":[],"pathway":[],"complexes":["RAP1/2 rhoptry complex","RAP1/3 rhoptry complex","MSP-1 merozoite surface complex (RAP-1 associated)"],"partners":["RAP-2","RAP-3","PFMSP-1"],"other_free_text":["Synthesized as an ~84-86 kDa precursor (Pr86) with a cleavable N-terminal signal peptide, processed sequentially to p82 then p67 within the rhoptries [#2, #3].","Precursor processing depends on Golgi-associated vesicular fusion; blocked reversibly by brefeldin A/low temperature and irreversibly by N-ethylmaleimide [#2].","Core organizing component of low-molecular-weight rhoptry complexes and enriched in detergent-resistant membranes of schizonts [#5].","Required for transfer/tagging of rhoptry-derived protein onto normal (bystander) erythrocyte surfaces; RAP-1 and RAP-2 bind erythrocytes but RAP-3 does not [#6].","Dispensable for rhoptry morphology and erythrocyte invasion but required post-invasion for parasitophorous vacuolar membrane integrity and intra-erythrocytic growth [#8].","In P. berghei, required to target RAP-2 to the rhoptries and contributes to virulence [#9].","Inhibitory monoclonal antibodies against RAP-1 epitopes inhibit parasite growth and invasion in vitro [#0, #1, #4].","Metalloproteinases co-isolating with the RAP-1 complex are serum contaminants, not parasite proteins [#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 parasitology","url":"https://pubmed.ncbi.nlm.nih.gov/7838184","citation_count":229,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["RAP"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"9584096","id":"PMC_9584096","title":"Genetic polymorphism and natural selection in the malaria parasite Plasmodium 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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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disulfide bonds important for its structure, and monoclonal antibodies against it inhibit parasite growth in vitro.\",\n      \"method\": \"Immunoaffinity purification, SDS-PAGE, Western blot, autocatalytic processing analysis, monoclonal antibody inhibition assays, gene sequencing\",\n      \"journal\": \"Molecular and biochemical parasitology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods (biochemical purification, in vitro growth inhibition, sequence analysis) in a single lab\",\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 recognize linear epitopes mapping 10-20 amino acids C-terminal to the proteolytic cleavage site (at amino acid 190) that converts the 80-kDa form (p80) to the 65-kDa form (p65). The 65-kDa processing product is absent from purified merozoites, suggesting its generation is associated with merozoite release rather than erythrocyte invasion.\",\n      \"method\": \"Epitope mapping with beta-galactosidase fusion proteins and synthetic peptides, Western blot, in vitro parasite growth inhibition assay\",\n      \"journal\": \"Molecular and biochemical parasitology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods (fusion protein epitope mapping, synthetic peptides, growth inhibition), 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 to the rhoptries is regulated by the secretory pathway. Brefeldin A (BFA) and low temperature reversibly block processing of an 86-kDa precursor (Pr86) to the mature 82-kDa RAP-1 product (p82). N-ethylmaleimide (which prevents vesicle-Golgi fusion) irreversibly blocks this processing. In vitro translation reveals a cleavable N-terminal signal peptide and an initial 84-kDa primary translation product, suggesting RAP-1 acquires an undetected protein modification during maturation.\",\n      \"method\": \"Brefeldin A and low-temperature blockade experiments on intact cells, N-ethylmaleimide treatment, in vitro translation, immunoblot\",\n      \"journal\": \"Molecular and biochemical parasitology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple pharmacological perturbations (BFA, low temperature, NEM) with defined biochemical readout, in vitro translation confirmation, focused study on this protein's trafficking\",\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 N-terminal cleavages: first to p82 (rapid, in rhoptries) then to p67 (delayed, also in rhoptries). Pr86 can form complexes with RAP-2 product p39 and RAP-3 product p37 prior to processing. p82 and p67 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 play a role in a narrow window during merozoite invasion.\",\n      \"method\": \"Immunoblot with epitope-selective antibodies, size fractionation of BFA-treated radiolabeled parasites, immunofluorescence localization\",\n      \"journal\": \"Molecular and biochemical parasitology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (epitope mapping, BFA pulse-chase, immunofluorescence, co-fractionation) establishing 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\": \"A second inhibitory B-cell epitope (iB-2) was identified in RAP-1 near the amino terminus of p67, distinct from the previously characterized iB-1 (N200TLTPLEELYPT211). Monoclonal antibody 1D6 binds iB-2 and inhibits parasite invasion of erythrocytes in vitro. Anti-iB-1 antibodies were produced during infection but not readily boosted upon reinfection, suggesting iB-1 is immunogenic but not immunodominant.\",\n      \"method\": \"Owl monkey infection model, monoclonal antibody production, in vitro erythrocyte invasion inhibition assay, peptide epitope mapping\",\n      \"journal\": \"Infection and immunity\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vitro invasion inhibition with defined epitope mapping, single lab, multiple methods\",\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 (RAP1/2 and RAP1/3) and is enriched in detergent-resistant membranes (DRMs) of P. falciparum schizonts. RAP-1 predominates in high-molecular-weight species by blue native PAGE, suggesting its participation in complexes larger than 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 plus mass spectrometry identification, single lab, focused biochemical characterization\",\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. Parasites with RAP-1 gene disruption lose their capacity to tag erythrocytes with rhoptry-derived proteins, implicating RAP-1 in the transfer of rhoptry material to bystander erythrocytes.\",\n      \"method\": \"Gene disruption (RAP-1 and RAP-3 knock-out mutants), surface iodination experiments, binding assays with normal erythrocytes\",\n      \"journal\": \"The Journal of infectious diseases\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic knockout with direct biochemical readout (surface iodination), comparison between RAP-1 and RAP-3 mutants providing specificity control\",\n      \"pmids\": [\"17624849\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"RAP-1 is pulled down as part of the PfMSP-1 surface complex on merozoites, together with RAP-2 and two RAP-domain-containing proteins; this complex is present at the schizont/merozoite stage but not in the subsequent ring stage and is shed into culture supernatant.\",\n      \"method\": \"Antibody pull-down from merozoite lysate, tandem mass spectrometry identification\",\n      \"journal\": \"Journal of proteome research\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single pull-down/MS experiment, 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\": \"The RAP complex (including RAP-1) is not required for rhoptry morphology or erythrocyte invasion, but is required post-invasion for normal parasitophorous vacuolar membrane (PVM) structure and intra-erythrocytic parasite growth. Conditional knockdown of RAP complex members leads to altered PVM structure, delayed intra-erythrocytic growth, and reduced parasitaemias in infected mice.\",\n      \"method\": \"Conditional knockdown (inducible system), electron microscopy of PVM structure, parasite growth assays, mouse infection model\",\n      \"journal\": \"Cellular microbiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — conditional knockdown with multiple orthogonal phenotypic readouts (PVM ultrastructure, in vitro growth, in vivo parasitemia), clear post-invasion role established\",\n      \"pmids\": [\"28205319\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}, {\"species\": \"Plasmodium berghei\", \"strain\": \"ANKA\"}]\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"In P. berghei, RAP-1 is required for targeting of RAP-2 to the rhoptries. RAP1-deficient P. berghei ANKA parasites show increased parasitemia during early infection but reduced virulence (mice survive longer), establishing RAP-1 as a contributor to parasite virulence.\",\n      \"method\": \"Genetic disruption of RAP1 in P. berghei ANKA, mouse infection experiments measuring parasitemia and survival\",\n      \"journal\": \"Experimental parasitology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic knockout with in vivo phenotypic readout and functional consequence (RAP-2 mislocalization), 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 immunoaffinity chromatography but originate from human serum used to cultivate P. falciparum in vitro (not from the parasite itself), as confirmed by the absence of immunofluorescence staining of intracellular parasites with metalloproteinase-specific antisera.\",\n      \"method\": \"Co-isolation by immunoaffinity chromatography, proteinase inhibitor profiling, immunoprecipitation with monospecific antisera, indirect immunofluorescence\",\n      \"journal\": \"Biochimica et biophysica acta\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — negative result rigorously established by multiple orthogonal methods (co-isolation, IFA, immunoprecipitation) showing the metalloproteinases are serum contaminants not parasite proteins\",\n      \"pmids\": [\"1477099\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    }\n  ],\n  \"current_model\": \"PF3D7_1123600 (RAP-1) is a rhoptry bulb protein of P. falciparum that is synthesized as an ~84–86 kDa precursor, processed via the secretory pathway (requiring Golgi-dependent vesicle trafficking) through sequential N-terminal cleavages first to p82 then to p67 within the rhoptries, forms stable complexes with RAP-2 and RAP-3, binds to the surface of normal erythrocytes (dependent on RAP-1 but not RAP-3), is dispensable for erythrocyte invasion per se but is essential post-invasion for parasitophorous vacuolar membrane integrity and intra-erythrocytic parasite growth, and in P. berghei is required to target RAP-2 to the rhoptries and contributes to parasite virulence.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"PF3D7_1123600 (RAP-1) is a rhoptry bulb protein of Plasmodium falciparum that serves as the organizing core of low-molecular-weight rhoptry protein complexes and acts post-invasion to support intra-erythrocytic parasite development [#5, #8]. It is synthesized as an ~84–86 kDa precursor bearing a cleavable N-terminal signal peptide and is trafficked to the rhoptries via the secretory pathway: processing of the 86-kDa precursor to the mature p82 form is reversibly blocked by brefeldin A and low temperature and irreversibly blocked by N-ethylmaleimide, indicating dependence on Golgi-associated vesicular fusion [#2]. Within the rhoptries the precursor undergoes two sequential N-terminal cleavages, first a rapid conversion to p82 and then a delayed conversion to p67, and the precursor can assemble with the RAP-2 and RAP-3 products before processing [#3]. RAP-1 is the core component of the RAP1/2 and RAP1/3 complexes and is enriched in detergent-resistant membranes of schizonts [#5]. RAP-1 and RAP-2, but not RAP-3, bind the surface of normal erythrocytes, and disruption of RAP-1 abolishes the parasite's ability to tag bystander erythrocytes with rhoptry-derived material [#6]. The RAP complex is dispensable for rhoptry morphology and erythrocyte invasion but is required for normal parasitophorous vacuolar membrane structure and for intra-erythrocytic growth; conditional knockdown produces altered PVM ultrastructure, delayed growth, and reduced parasitaemia in mice [#8]. In P. berghei, RAP-1 is required to target RAP-2 to the rhoptries and contributes to virulence, as RAP1-deficient parasites show reduced lethality [#9]. Monoclonal antibodies against RAP-1 epitopes inhibit parasite growth and invasion in vitro [#0, #1, #4].\",\n  \"teleology\": [\n    {\n      \"year\": 1990,\n      \"claim\": \"Established RAP-1 as a rhoptry antigen and defined its biochemical character, answering whether it is a single molecule or a processed multi-component antigen and whether it is a plausible growth-inhibition target.\",\n      \"evidence\": \"Immunoaffinity purification, SDS-PAGE, autocatalytic processing analysis and monoclonal antibody growth inhibition in P. falciparum\",\n      \"pmids\": [\"2200961\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Precursor size and trafficking route not yet resolved\", \"Molecular function of the protein not defined\", \"Relationship of the multiple bands to a defined processing pathway unclear\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 1992,\n      \"claim\": \"Mapped inhibitory antibody epitopes relative to the p80-to-p65 cleavage site and linked p65 generation to merozoite release rather than invasion, connecting processing to the parasite life-cycle stage.\",\n      \"evidence\": \"Epitope mapping with fusion proteins and synthetic peptides plus growth inhibition in P. falciparum\",\n      \"pmids\": [\"1279419\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Enzyme responsible for cleavage not identified\", \"Functional consequence of processing for the protein's activity unknown\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 1992,\n      \"claim\": \"Resolved whether metalloproteinases co-purifying with the RAP-1 complex were parasite-derived, ruling them out as bona fide RAP-1 partners.\",\n      \"evidence\": \"Co-isolation, proteinase inhibitor profiling, immunoprecipitation and immunofluorescence in P. falciparum\",\n      \"pmids\": [\"1477099\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Does not identify authentic parasite-derived interactors of RAP-1\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 1995,\n      \"claim\": \"Defined the trafficking route of RAP-1, showing precursor-to-mature processing depends on the secretory pathway and Golgi-associated vesicle fusion.\",\n      \"evidence\": \"Brefeldin A, low-temperature and N-ethylmaleimide blockade with in vitro translation and immunoblot in P. falciparum\",\n      \"pmids\": [\"8719244\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Identity of the inferred post-translational modification not determined\", \"Protease(s) mediating rhoptry processing unknown\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 1998,\n      \"claim\": \"Established the ordered two-step processing pathway (Pr86 to p82 to p67) and showed precursor assembly with RAP-2 and RAP-3 products precedes processing, defining when complexes form.\",\n      \"evidence\": \"Epitope-selective immunoblot, BFA pulse-chase co-fractionation and immunofluorescence in P. falciparum\",\n      \"pmids\": [\"9574915\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Functional role of p67-specific window during invasion not directly tested\", \"Stoichiometry of the RAP complexes unresolved\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 1998,\n      \"claim\": \"Identified a second inhibitory epitope near the p67 N-terminus, extending the map of functionally important, antibody-accessible regions of RAP-1.\",\n      \"evidence\": \"Owl monkey infection, monoclonal antibody 1D6, in vitro invasion inhibition and peptide mapping in P. falciparum\",\n      \"pmids\": [\"9423886\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism by which antibody binding inhibits invasion not defined\", \"Native function of the iB-2 region unknown\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Positioned RAP-1 as the core of the RAP1/2 and RAP1/3 complexes and localized it to detergent-resistant membranes, framing its role as a scaffolding/complex-organizing component.\",\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 larger high-molecular-weight species not identified\", \"Molecular basis of DRM association unknown\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Used gene disruption to demonstrate RAP-1 is required for transfer of rhoptry-derived protein onto bystander erythrocyte surfaces, assigning a specific function distinct from RAP-3.\",\n      \"evidence\": \"RAP-1 and RAP-3 knockouts with surface iodination and erythrocyte binding assays in P. falciparum\",\n      \"pmids\": [\"17624849\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Biological purpose of tagging bystander erythrocytes not established\", \"Direct receptor on the erythrocyte surface not identified\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Placed RAP-1 within the MSP-1 merozoite surface complex, indicating a stage-restricted association that is shed before the ring stage.\",\n      \"evidence\": \"Antibody pull-down from merozoite lysate with tandem mass spectrometry in P. falciparum\",\n      \"pmids\": [\"21175202\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Single pull-down/MS without reciprocal validation specific to RAP-1\", \"Direct versus indirect nature of the MSP-1 association unresolved\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Defined the essential post-invasion role of the RAP complex, showing RAP-1 is dispensable for invasion but required for PVM integrity and intra-erythrocytic growth.\",\n      \"evidence\": \"Conditional knockdown with PVM electron microscopy, growth assays and mouse infection in P. falciparum and P. berghei ANKA\",\n      \"pmids\": [\"28205319\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular mechanism by which RAP complex supports PVM structure unknown\", \"Direct RAP-1 contribution versus whole-complex effect not separated\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}, {\"species\": \"Plasmodium berghei\", \"strain\": \"ANKA\"}]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Showed in a rodent model that RAP-1 targets RAP-2 to the rhoptries and contributes to virulence, linking complex assembly to disease outcome.\",\n      \"evidence\": \"Genetic disruption of RAP1 in P. berghei ANKA with parasitemia and survival measurements\",\n      \"pmids\": [\"29307564\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether RAP-1 targets RAP-2 identically in P. falciparum not tested here\", \"Mechanism connecting RAP-2 mislocalization to virulence undefined\"],\n      \"attribution\": [{\"species\": \"Plasmodium berghei\", \"strain\": \"ANKA\"}]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The biochemical/molecular activity of RAP-1 itself and the mechanism by which the RAP complex maintains PVM integrity remain unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No defined enzymatic or ligand-binding activity for RAP-1\", \"Protease(s) mediating rhoptry processing not identified\", \"Mechanistic basis of PVM defect in RAP-deficient parasites 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, 2, 3, 5]},\n      {\"term_id\": \"GO:0009986\", \"supporting_discovery_ids\": [6, 7]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"GO:0006886\", \"supporting_discovery_ids\": [2, 3]},\n      {\"term_id\": \"GO:0016485\", \"supporting_discovery_ids\": [1, 3]}\n    ],\n    \"complexes\": [\"RAP1/2 rhoptry complex\", \"RAP1/3 rhoptry complex\", \"MSP-1 merozoite surface complex (RAP-1 associated)\"],\n    \"partners\": [\"RAP-2\", \"RAP-3\", \"PfMSP-1\"],\n    \"other_free_text\": [\n      \"Synthesized as an ~84-86 kDa precursor (Pr86) with a cleavable N-terminal signal peptide, processed sequentially to p82 then p67 within the rhoptries [#2, #3].\",\n      \"Precursor processing depends on Golgi-associated vesicular fusion; blocked reversibly by brefeldin A/low temperature and irreversibly by N-ethylmaleimide [#2].\",\n      \"Core organizing component of low-molecular-weight rhoptry complexes and enriched in detergent-resistant membranes of schizonts [#5].\",\n      \"Required for transfer/tagging of rhoptry-derived protein onto normal (bystander) erythrocyte surfaces; RAP-1 and RAP-2 bind erythrocytes but RAP-3 does not [#6].\",\n      \"Dispensable for rhoptry morphology and erythrocyte invasion but required post-invasion for parasitophorous vacuolar membrane integrity and intra-erythrocytic growth [#8].\",\n      \"In P. berghei, required to target RAP-2 to the rhoptries and contributes to virulence [#9].\",\n      \"Inhibitory monoclonal antibodies against RAP-1 epitopes inhibit parasite growth and invasion in vitro [#0, #1, #4].\",\n      \"Metalloproteinases co-isolating with the RAP-1 complex are serum contaminants, not parasite proteins [#10].\"\n    ]\n  }\n}","audit_flag":{"gene":"PF3D7_1123600","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_1123600","name":null,"product":"RAP protein, putative","uniprot_acc":null,"chromosome":null,"start_pos":null},{"strain":"PbANKA","gene_id":"PBANKA_0924700","name":null,"product":"RAP protein, putative","uniprot_acc":null,"chromosome":null,"start_pos":null},{"strain":"PkH","gene_id":"PKNH_0921400","name":null,"product":"RAP protein, putative","uniprot_acc":null,"chromosome":null,"start_pos":null}],"gene_symbol":"","evaluation":null}