{"gene":"PF3D7_1471300","run_date":"2026-09-08T14:19:07","timeline":{"discoveries":[{"year":1990,"finding":"RAP-1 is a multi-component rhoptry antigen of P. falciparum consisting of four major proteins (80, 65, 42, 40 kDa) and two minor proteins (77, 70 kDa); monoclonal antibody evidence, autocatalytic processing, and immunological cross-reactivity suggest all components are derived from the same precursor protein. The antigen is lipophilic and disulphide bonding plays an important role in its structure.","method":"Immunoaffinity chromatography, SDS-PAGE, Western blot, monoclonal antibody epitope analysis, sequence analysis","journal":"Molecular and biochemical parasitology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal biochemical methods (purification, Western blot, mAb characterization, sequence), single lab","pmids":["2200961"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":1992,"finding":"RAP-1 undergoes proteolytic cleavage processing from an 80-kDa precursor (p80) to a 65-kDa form (p65) during late schizogony. Inhibitory monoclonal antibodies map to a region 10–20 amino acids C-terminal to the proteolytic cleavage site at amino acid 190. The 65-kDa processed form is not present in purified merozoites, suggesting its generation is associated with merozoite release rather than erythrocyte invasion.","method":"Western blot, beta-galactosidase fusion protein epitope mapping, synthetic peptide reactivity, immunoblot of purified merozoites","journal":"Molecular and biochemical parasitology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — epitope mapping with fusion proteins and synthetic peptides, multiple orthogonal methods, 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 fusion with Golgi membranes, irreversibly blocks Pr86 processing. In vitro translation reveals a cleavable N-terminal signal peptide and an initial 84-kDa primary translation product distinct from the in vivo Pr86, suggesting an undetected protein modification during maturation.","method":"Brefeldin A treatment, low-temperature block, N-ethylmaleimide treatment, pulse-chase metabolic labeling, in vitro translation","journal":"Molecular and biochemical parasitology","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — multiple pharmacological perturbations with orthogonal approaches (BFA, low-temperature, NEM, in vitro translation) all converging on secretory pathway requirement; single lab but multiple independent lines of evidence","pmids":["8719244"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":1998,"finding":"RAP-1 products p82 and p67 are formed from the precursor Pr86 by progressive removal of epitopes from the amino-terminus. Pr86 forms complexes containing RAP-2 product p39 and RAP-3 product p37 (demonstrated after size fractionation under BFA). Pr86 is localized to rhoptries transiently and is not detected in segmenting schizonts or extracellular merozoites; p67 and p82 are major RAP-1 components in purified merozoites. Neither p67 nor p82 relocalize from rhoptries to the merozoite surface. Processing of Pr86 begins after complexes are transported to forming rhoptries, involving two sequential cleavages: rapid Pr86-to-p82, then delayed p82-to-p67.","method":"Immunoblot with epitope-specific antibodies, size fractionation under BFA, immunofluorescence localization, purified merozoite analysis","journal":"Molecular and biochemical parasitology","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (mAb epitope mapping, BFA-blocked fractionation, IFA, purified merozoite Western blot), single lab with comprehensive mechanistic dissection","pmids":["9574915"],"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), identified in detergent-resistant membranes (DRMs) of P. falciparum schizonts. RAP-1 predominates in high molecular weight species by BN-PAGE, suggesting aggregation into larger complexes.","method":"DRM purification, blue native-PAGE (BN-PAGE), mass spectrometry","journal":"Molecular and biochemical parasitology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — BN-PAGE combined with mass spectrometry identification, single lab, two orthogonal methods","pmids":["17553576"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2007,"finding":"RAP-1 and RAP-2 (members of the low molecular weight rhoptry protein complex) bind to the surface of normal (non-parasitized) erythrocytes. RAP-1 gene-disruption mutant parasites lose the capacity to tag erythrocytes with rhoptry proteins (assessed by surface iodination), demonstrating RAP-1 is required for this tagging. RAP-3 disruption did not abolish tagging.","method":"Gene disruption (RAP-1 and RAP-3 knockouts), surface iodination experiments, antibody binding assays on normal erythrocytes","journal":"The Journal of infectious diseases","confidence":"High","confidence_rationale":"Tier 2 / Strong — gene-disruption knockout with specific molecular readout (surface iodination), includes negative control (RAP-3 mutant), direct functional consequence established","pmids":["17624849"],"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 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, electron microscopy of PVM, in vivo mouse infection assays, growth assays","journal":"Cellular microbiology","confidence":"High","confidence_rationale":"Tier 2 / Strong — conditional knockdown with multiple orthogonal phenotypic readouts (PVM ultrastructure, growth delay, in vivo parasitemia), also validated in rodent malaria model","pmids":["28205319"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""},{"species":"Plasmodium berghei","strain":"ANKA"}]},{"year":2010,"finding":"RAP-1 is a component of the merozoite surface protein-1 (MSP-1) associated complex on the P. falciparum merozoite surface, co-purified alongside RAP-2, PfRhopH1, PfRhopH3, PfMSP-3, PfMSP-6, PfMSP-7, PfMSP-9, and two RAP domain-containing proteins. This complex is present at schizont/merozoite stages but not the subsequent ring stage.","method":"Pull-down with anti-PfMSP-1 and anti-PfRhopH3 antibodies, tandem mass spectrometry identification","journal":"Journal of proteome research","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — single Co-IP/pulldown with MS identification, replicated with two different antibodies, single lab","pmids":["21175202"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":1992,"finding":"Three matrix metalloproteinases (220, 95, and 70 kDa) co-isolate non-covalently with the RAP-1 complex but not with RAP-3 or gp195. These enzymes are inhibited only by EDTA (among nine proteinase inhibitors tested) and are enhanced synergistically by cobalt. However, immunoprecipitation with antisera to macrophage and fibroblast gelatinase confirmed these enzymes' identity, and they do not react with intracellular parasites by IFA, indicating the metalloproteinases originate from human serum used for in vitro culture rather than from the parasite itself.","method":"Co-isolation by immunoaffinity, proteinase inhibitor panel, metal ion dose-response, immunoprecipitation, indirect immunofluorescence","journal":"Biochimica et biophysica acta","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single lab, single method (co-isolation), and the metalloproteinases were concluded to be serum contaminants rather than genuine parasite binding partners","pmids":["1477099"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2018,"finding":"In P. berghei, RAP-1 is required for targeting of RAP-2 to the rhoptries. RAP1-deficient P. berghei ANKA parasites showed increased early-phase parasitemia but mice survived longer; RAP2/3-deficient parasites showed low parasitemia and mice recovered from infection. These findings indicate RAP-1 and RAP-2/3 contribute to virulence.","method":"Comparative genomics, generation of RAP1-deficient and RAP2/3-deficient P. berghei ANKA mutants, mouse infection outcome assays","journal":"Experimental parasitology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic knockout with in vivo phenotypic readout; RAP-1 requirement for RAP-2 rhoptry targeting established by deletion mutant analysis, single lab","pmids":["29307564"],"is_preprint":false,"attribution":[{"species":"Plasmodium berghei","strain":"ANKA"}]}],"current_model":"PF3D7_1471300 (RAP-1) is a rhoptry bulb protein of Plasmodium falciparum that is synthesized as a precursor (Pr86/p80), transported to the rhoptries via the secretory pathway (requiring Golgi function), and sequentially processed to p82 and p67 forms; it forms the core of low-molecular-weight RAP complexes with RAP-2 and RAP-3, is required for binding/tagging of normal erythrocytes with rhoptry proteins during merozoite release, is necessary (in P. berghei) for targeting RAP-2 to the rhoptries, and functions post-invasion to maintain parasitophorous vacuolar membrane integrity and support intra-erythrocytic parasite growth rather than being required for invasion itself."},"narrative":{"mechanistic_narrative":"PF3D7_1471300 (RAP-1) is a rhoptry protein of Plasmodium falciparum that serves as the scaffolding core of low-molecular-weight rhoptry protein complexes and functions after erythrocyte invasion to support intra-erythrocytic parasite development [PMID:17553576, PMID:28205319]. It is synthesized as a precursor (Pr86/p80) bearing a cleavable N-terminal signal peptide and is routed to the rhoptries through the secretory pathway; transport and maturation depend on Golgi function, as brefeldin A, low temperature, and N-ethylmaleimide block conversion of Pr86 to the mature product [PMID:8719244]. Once delivered to the forming rhoptries, RAP-1 is proteolytically matured by two sequential N-terminal cleavages, generating p82 and then p67, with generation of processed forms associated with schizogony and merozoite release rather than invasion [PMID:1279419, PMID:9574915]. RAP-1 assembles with RAP-2 and RAP-3 into distinct RAP1/2 and RAP1/3 complexes within detergent-resistant membranes and is required to tag the surface of normal erythrocytes with rhoptry proteins, a capacity lost upon RAP-1 gene disruption but retained upon RAP-3 disruption [PMID:9574915, PMID:17553576, PMID:17624849]. The complex is dispensable for rhoptry morphology and invasion itself but is needed post-invasion for parasitophorous vacuolar membrane integrity and parasite growth, and it contributes to virulence in vivo [PMID:28205319]. In P. berghei, RAP-1 is additionally required to target RAP-2 to the rhoptries [PMID:29307564].","teleology":[{"year":1990,"claim":"Established that RAP-1 is a single-precursor-derived, multi-component rhoptry antigen, framing all later processing work by defining the protein family of related bands as products of one gene.","evidence":"Immunoaffinity purification, SDS-PAGE, monoclonal antibody epitope analysis and sequence analysis of the rhoptry antigen in P. falciparum","pmids":["2200961"],"confidence":"Medium","gaps":["Precursor-product relationships inferred immunologically, not by pulse-chase","No subcellular trafficking route defined","Function of the antigen not addressed"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":1992,"claim":"Showed that RAP-1 is proteolytically processed from p80 to p65 during late schizogony and that processing is linked to merozoite release rather than invasion, tying maturation to a specific stage of the parasite life cycle.","evidence":"Western blot, fusion-protein and synthetic-peptide epitope mapping, and immunoblot of purified merozoites in P. falciparum","pmids":["1279419"],"confidence":"Medium","gaps":["Protease responsible for cleavage not identified","Functional consequence of processing not tested","Cleavage site mapping resolution limited"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":1995,"claim":"Defined the trafficking route by demonstrating that RAP-1 precursor maturation depends on the secretory/Golgi pathway, answering how the protein reaches the rhoptries.","evidence":"Brefeldin A, low-temperature and N-ethylmaleimide blocks, pulse-chase labeling and in vitro translation in P. falciparum","pmids":["8719244"],"confidence":"High","gaps":["Identity of the inferred post-translational modification producing Pr86 unresolved","Rhoptry-specific targeting signal not mapped"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":1998,"claim":"Resolved the ordered maturation pathway (Pr86->p82->p67) and showed that RAP-1 assembles with RAP-2 and RAP-3 before processing, establishing RAP-1 as a complex-forming precursor processed after rhoptry delivery.","evidence":"Epitope-specific immunoblot, BFA-blocked size fractionation, immunofluorescence and purified merozoite analysis in P. falciparum","pmids":["9574915"],"confidence":"High","gaps":["Stoichiometry of the complexes not quantified","Functional role of processed forms not tested","No relocalization to merozoite surface, leaving downstream role open"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2007,"claim":"Confirmed RAP-1 as the core of two distinct low-molecular-weight complexes (RAP1/2, RAP1/3) within detergent-resistant membranes, defining its biochemical architecture.","evidence":"DRM purification, blue native-PAGE and mass spectrometry of P. falciparum schizonts","pmids":["17553576"],"confidence":"Medium","gaps":["Nature of higher-order aggregation not characterized","Complex assembly determinants unknown"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2007,"claim":"Provided the first direct functional evidence that RAP-1 is required to tag normal erythrocytes with rhoptry proteins, with RAP-3 dispensable, distinguishing RAP-1's specific role within the complex.","evidence":"RAP-1 and RAP-3 gene disruption with surface iodination and antibody binding assays on normal erythrocytes in P. falciparum","pmids":["17624849"],"confidence":"High","gaps":["Erythrocyte receptor for the tagging not identified","Biological purpose of tagging not defined"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2010,"claim":"Placed RAP-1 within the MSP-1-associated merozoite surface complex, linking the rhoptry protein to a surface protein network at schizont/merozoite stages.","evidence":"Anti-MSP-1 and anti-RhopH3 pull-downs with tandem mass spectrometry in P. falciparum","pmids":["21175202"],"confidence":"Medium","gaps":["Direct versus indirect association not distinguished","Single Co-IP approach without reciprocal functional validation","Contradicts earlier finding that RAP-1 does not relocalize to the merozoite surface"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2017,"claim":"Overturned the assumption that RAP-1 acts during invasion by showing the complex is dispensable for invasion but required post-invasion for PVM integrity and parasite growth, redefining its cellular role.","evidence":"Conditional knockdown with PVM electron microscopy, growth assays and in vivo mouse infection in P. falciparum and P. berghei ANKA","pmids":["28205319"],"confidence":"High","gaps":["Molecular mechanism by which RAP-1 supports PVM structure unknown","Direct interaction with PVM components not shown"],"attribution":[{"species":"Plasmodium falciparum","strain":""},{"species":"Plasmodium berghei","strain":"ANKA"}]},{"year":2018,"claim":"Demonstrated in the rodent model that RAP-1 is required for rhoptry targeting of RAP-2 and contributes to virulence, establishing a hierarchical role within the complex.","evidence":"RAP1-deficient and RAP2/3-deficient P. berghei ANKA mutants with mouse infection outcome assays","pmids":["29307564"],"confidence":"Medium","gaps":["Whether RAP-1 similarly chaperones RAP-2 targeting in P. falciparum not tested here","Structural basis of targeting dependence unknown"],"attribution":[{"species":"Plasmodium berghei","strain":"ANKA"}]},{"year":null,"claim":"The molecular mechanism by which RAP-1 maintains parasitophorous vacuolar membrane integrity and its direct binding partners at the PVM remain unresolved.","evidence":"","pmids":[],"confidence":"High","gaps":["No identified molecular target of RAP-1 at the PVM","Protease responsible for Pr86 processing unidentified","Functional role of the sequential p82/p67 maturation not tested"],"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"],"partners":["RAP-2","RAP-3","PFMSP-1"],"other_free_text":["Synthesized as a precursor Pr86/p80 and sequentially processed to p82 then p67 by N-terminal cleavage during schizogony [#1, #3]","Bears a cleavable N-terminal signal peptide; maturation requires the secretory/Golgi pathway [#2]","Required to tag normal erythrocytes with rhoptry proteins; RAP-3 is dispensable for this [#5]","Dispensable for rhoptry morphology and invasion; required post-invasion for PVM integrity and intra-erythrocytic growth [#6]","In P. berghei ANKA, required for targeting RAP-2 to the rhoptries and contributes to virulence [#9]","Metalloproteinases co-isolating with the RAP-1 complex were concluded to be serum contaminants, not parasite partners [#8]"]}},"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 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 protein RAP-2/RSP-2 in relation to anaemia in Cameroonian children.","date":"2011","source":"Parasite immunology","url":"https://pubmed.ncbi.nlm.nih.gov/21226723","citation_count":10,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["RAP"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"29307564","id":"PMC_29307564","title":"Comparative genomics and proteomic analyses between lethal and nonlethal strains of Plasmodium berghei.","date":"2018","source":"Experimental parasitology","url":"https://pubmed.ncbi.nlm.nih.gov/29307564","citation_count":8,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["RAP"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"1298072","id":"PMC_1298072","title":"Towards a malaria vaccine: riding the rollercoaster between unrealistic optimism and lethal pessimism.","date":"1992","source":"The Southeast 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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":23287,"output_tokens":3259,"usd":0.059373,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":8943,"output_tokens":3805,"usd":0.06992,"stage2_stop_reason":"end_turn"},"total_usd":0.129293,"stage1_batch_id":"msgbatch_011BPjN2BL33F8cJXD1r7V7T","stage2_batch_id":"msgbatch_01Qwg6vP7qxkpL6Gsc7tajsb","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1990,\n      \"finding\": \"RAP-1 is a multi-component rhoptry antigen of P. falciparum consisting of four major proteins (80, 65, 42, 40 kDa) and two minor proteins (77, 70 kDa); monoclonal antibody evidence, autocatalytic processing, and immunological cross-reactivity suggest all components are derived from the same precursor protein. The antigen is lipophilic and disulphide bonding plays an important role in its structure.\",\n      \"method\": \"Immunoaffinity chromatography, SDS-PAGE, Western blot, monoclonal antibody epitope analysis, sequence analysis\",\n      \"journal\": \"Molecular and biochemical parasitology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal biochemical methods (purification, Western blot, mAb characterization, sequence), single lab\",\n      \"pmids\": [\"2200961\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 1992,\n      \"finding\": \"RAP-1 undergoes proteolytic cleavage processing from an 80-kDa precursor (p80) to a 65-kDa form (p65) during late schizogony. Inhibitory monoclonal antibodies map to a region 10–20 amino acids C-terminal to the proteolytic cleavage site at amino acid 190. The 65-kDa processed form is not present in purified merozoites, suggesting its generation is associated with merozoite release rather than erythrocyte invasion.\",\n      \"method\": \"Western blot, beta-galactosidase fusion protein epitope mapping, synthetic peptide reactivity, immunoblot of purified merozoites\",\n      \"journal\": \"Molecular and biochemical parasitology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — epitope mapping with fusion proteins and synthetic peptides, multiple orthogonal methods, 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 fusion with Golgi membranes, irreversibly blocks Pr86 processing. In vitro translation reveals a cleavable N-terminal signal peptide and an initial 84-kDa primary translation product distinct from the in vivo Pr86, suggesting an undetected protein modification during maturation.\",\n      \"method\": \"Brefeldin A treatment, low-temperature block, N-ethylmaleimide treatment, pulse-chase metabolic labeling, in vitro translation\",\n      \"journal\": \"Molecular and biochemical parasitology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — multiple pharmacological perturbations with orthogonal approaches (BFA, low-temperature, NEM, in vitro translation) all converging on secretory pathway requirement; single lab but multiple independent lines of evidence\",\n      \"pmids\": [\"8719244\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"RAP-1 products p82 and p67 are formed from the precursor Pr86 by progressive removal of epitopes from the amino-terminus. Pr86 forms complexes containing RAP-2 product p39 and RAP-3 product p37 (demonstrated after size fractionation under BFA). Pr86 is localized to rhoptries transiently and is not detected in segmenting schizonts or extracellular merozoites; p67 and p82 are major RAP-1 components in purified merozoites. Neither p67 nor p82 relocalize from rhoptries to the merozoite surface. Processing of Pr86 begins after complexes are transported to forming rhoptries, involving two sequential cleavages: rapid Pr86-to-p82, then delayed p82-to-p67.\",\n      \"method\": \"Immunoblot with epitope-specific antibodies, size fractionation under BFA, immunofluorescence localization, purified merozoite analysis\",\n      \"journal\": \"Molecular and biochemical parasitology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (mAb epitope mapping, BFA-blocked fractionation, IFA, purified merozoite Western blot), single lab with comprehensive mechanistic dissection\",\n      \"pmids\": [\"9574915\"],\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), identified in detergent-resistant membranes (DRMs) of P. falciparum schizonts. RAP-1 predominates in high molecular weight species by BN-PAGE, suggesting aggregation into larger complexes.\",\n      \"method\": \"DRM purification, blue native-PAGE (BN-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, two orthogonal methods\",\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 (members of the low molecular weight rhoptry protein complex) bind to the surface of normal (non-parasitized) erythrocytes. RAP-1 gene-disruption mutant parasites lose the capacity to tag erythrocytes with rhoptry proteins (assessed by surface iodination), demonstrating RAP-1 is required for this tagging. RAP-3 disruption did not abolish tagging.\",\n      \"method\": \"Gene disruption (RAP-1 and RAP-3 knockouts), surface iodination experiments, antibody binding assays on normal erythrocytes\",\n      \"journal\": \"The Journal of infectious diseases\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — gene-disruption knockout with specific molecular readout (surface iodination), includes negative control (RAP-3 mutant), direct functional consequence established\",\n      \"pmids\": [\"17624849\"],\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 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, electron microscopy of PVM, in vivo mouse infection assays, growth assays\",\n      \"journal\": \"Cellular microbiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — conditional knockdown with multiple orthogonal phenotypic readouts (PVM ultrastructure, growth delay, in vivo parasitemia), also validated in rodent malaria model\",\n      \"pmids\": [\"28205319\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}, {\"species\": \"Plasmodium berghei\", \"strain\": \"ANKA\"}]\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"RAP-1 is a component of the merozoite surface protein-1 (MSP-1) associated complex on the P. falciparum merozoite surface, co-purified alongside RAP-2, PfRhopH1, PfRhopH3, PfMSP-3, PfMSP-6, PfMSP-7, PfMSP-9, and two RAP domain-containing proteins. This complex is present at schizont/merozoite stages but not the subsequent ring stage.\",\n      \"method\": \"Pull-down with anti-PfMSP-1 and anti-PfRhopH3 antibodies, tandem mass spectrometry identification\",\n      \"journal\": \"Journal of proteome research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — single Co-IP/pulldown with MS identification, replicated with two different antibodies, single lab\",\n      \"pmids\": [\"21175202\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 1992,\n      \"finding\": \"Three matrix metalloproteinases (220, 95, and 70 kDa) co-isolate non-covalently with the RAP-1 complex but not with RAP-3 or gp195. These enzymes are inhibited only by EDTA (among nine proteinase inhibitors tested) and are enhanced synergistically by cobalt. However, immunoprecipitation with antisera to macrophage and fibroblast gelatinase confirmed these enzymes' identity, and they do not react with intracellular parasites by IFA, indicating the metalloproteinases originate from human serum used for in vitro culture rather than from the parasite itself.\",\n      \"method\": \"Co-isolation by immunoaffinity, proteinase inhibitor panel, metal ion dose-response, immunoprecipitation, indirect immunofluorescence\",\n      \"journal\": \"Biochimica et biophysica acta\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single lab, single method (co-isolation), and the metalloproteinases were concluded to be serum contaminants rather than genuine parasite binding partners\",\n      \"pmids\": [\"1477099\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\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 showed increased early-phase parasitemia but mice survived longer; RAP2/3-deficient parasites showed low parasitemia and mice recovered from infection. These findings indicate RAP-1 and RAP-2/3 contribute to virulence.\",\n      \"method\": \"Comparative genomics, generation of RAP1-deficient and RAP2/3-deficient P. berghei ANKA mutants, mouse infection outcome assays\",\n      \"journal\": \"Experimental parasitology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic knockout with in vivo phenotypic readout; RAP-1 requirement for RAP-2 rhoptry targeting established by deletion mutant analysis, single lab\",\n      \"pmids\": [\"29307564\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium berghei\", \"strain\": \"ANKA\"}]\n    }\n  ],\n  \"current_model\": \"PF3D7_1471300 (RAP-1) is a rhoptry bulb protein of Plasmodium falciparum that is synthesized as a precursor (Pr86/p80), transported to the rhoptries via the secretory pathway (requiring Golgi function), and sequentially processed to p82 and p67 forms; it forms the core of low-molecular-weight RAP complexes with RAP-2 and RAP-3, is required for binding/tagging of normal erythrocytes with rhoptry proteins during merozoite release, is necessary (in P. berghei) for targeting RAP-2 to the rhoptries, and functions post-invasion to maintain parasitophorous vacuolar membrane integrity and support intra-erythrocytic parasite growth rather than being required for invasion itself.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"PF3D7_1471300 (RAP-1) is a rhoptry protein of Plasmodium falciparum that serves as the scaffolding core of low-molecular-weight rhoptry protein complexes and functions after erythrocyte invasion to support intra-erythrocytic parasite development [#4, #6]. It is synthesized as a precursor (Pr86/p80) bearing a cleavable N-terminal signal peptide and is routed to the rhoptries through the secretory pathway; transport and maturation depend on Golgi function, as brefeldin A, low temperature, and N-ethylmaleimide block conversion of Pr86 to the mature product [#2]. Once delivered to the forming rhoptries, RAP-1 is proteolytically matured by two sequential N-terminal cleavages, generating p82 and then p67, with generation of processed forms associated with schizogony and merozoite release rather than invasion [#1, #3]. RAP-1 assembles with RAP-2 and RAP-3 into distinct RAP1/2 and RAP1/3 complexes within detergent-resistant membranes and is required to tag the surface of normal erythrocytes with rhoptry proteins, a capacity lost upon RAP-1 gene disruption but retained upon RAP-3 disruption [#3, #4, #5]. The complex is dispensable for rhoptry morphology and invasion itself but is needed post-invasion for parasitophorous vacuolar membrane integrity and parasite growth, and it contributes to virulence in vivo [#6]. In P. berghei, RAP-1 is additionally required to target RAP-2 to the rhoptries [#9].\",\n  \"teleology\": [\n    {\n      \"year\": 1990,\n      \"claim\": \"Established that RAP-1 is a single-precursor-derived, multi-component rhoptry antigen, framing all later processing work by defining the protein family of related bands as products of one gene.\",\n      \"evidence\": \"Immunoaffinity purification, SDS-PAGE, monoclonal antibody epitope analysis and sequence analysis of the rhoptry antigen in P. falciparum\",\n      \"pmids\": [\"2200961\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Precursor-product relationships inferred immunologically, not by pulse-chase\", \"No subcellular trafficking route defined\", \"Function of the antigen not addressed\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 1992,\n      \"claim\": \"Showed that RAP-1 is proteolytically processed from p80 to p65 during late schizogony and that processing is linked to merozoite release rather than invasion, tying maturation to a specific stage of the parasite life cycle.\",\n      \"evidence\": \"Western blot, fusion-protein and synthetic-peptide epitope mapping, and immunoblot of purified merozoites in P. falciparum\",\n      \"pmids\": [\"1279419\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Protease responsible for cleavage not identified\", \"Functional consequence of processing not tested\", \"Cleavage site mapping resolution limited\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 1995,\n      \"claim\": \"Defined the trafficking route by demonstrating that RAP-1 precursor maturation depends on the secretory/Golgi pathway, answering how the protein reaches the rhoptries.\",\n      \"evidence\": \"Brefeldin A, low-temperature and N-ethylmaleimide blocks, pulse-chase labeling and in vitro translation in P. falciparum\",\n      \"pmids\": [\"8719244\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Identity of the inferred post-translational modification producing Pr86 unresolved\", \"Rhoptry-specific targeting signal not mapped\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 1998,\n      \"claim\": \"Resolved the ordered maturation pathway (Pr86->p82->p67) and showed that RAP-1 assembles with RAP-2 and RAP-3 before processing, establishing RAP-1 as a complex-forming precursor processed after rhoptry delivery.\",\n      \"evidence\": \"Epitope-specific immunoblot, BFA-blocked size fractionation, immunofluorescence and purified merozoite analysis in P. falciparum\",\n      \"pmids\": [\"9574915\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Stoichiometry of the complexes not quantified\", \"Functional role of processed forms not tested\", \"No relocalization to merozoite surface, leaving downstream role open\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Confirmed RAP-1 as the core of two distinct low-molecular-weight complexes (RAP1/2, RAP1/3) within detergent-resistant membranes, defining its biochemical architecture.\",\n      \"evidence\": \"DRM purification, blue native-PAGE and mass spectrometry of P. falciparum schizonts\",\n      \"pmids\": [\"17553576\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Nature of higher-order aggregation not characterized\", \"Complex assembly determinants unknown\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Provided the first direct functional evidence that RAP-1 is required to tag normal erythrocytes with rhoptry proteins, with RAP-3 dispensable, distinguishing RAP-1's specific role within the complex.\",\n      \"evidence\": \"RAP-1 and RAP-3 gene disruption with surface iodination and antibody binding assays on normal erythrocytes in P. falciparum\",\n      \"pmids\": [\"17624849\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Erythrocyte receptor for the tagging not identified\", \"Biological purpose of tagging not defined\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Placed RAP-1 within the MSP-1-associated merozoite surface complex, linking the rhoptry protein to a surface protein network at schizont/merozoite stages.\",\n      \"evidence\": \"Anti-MSP-1 and anti-RhopH3 pull-downs with tandem mass spectrometry in P. falciparum\",\n      \"pmids\": [\"21175202\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct versus indirect association not distinguished\", \"Single Co-IP approach without reciprocal functional validation\", \"Contradicts earlier finding that RAP-1 does not relocalize to the merozoite surface\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Overturned the assumption that RAP-1 acts during invasion by showing the complex is dispensable for invasion but required post-invasion for PVM integrity and parasite growth, redefining its cellular role.\",\n      \"evidence\": \"Conditional knockdown with PVM electron microscopy, growth assays and in vivo mouse infection in P. falciparum and P. berghei ANKA\",\n      \"pmids\": [\"28205319\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular mechanism by which RAP-1 supports PVM structure unknown\", \"Direct interaction with PVM components not shown\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}, {\"species\": \"Plasmodium berghei\", \"strain\": \"ANKA\"}]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Demonstrated in the rodent model that RAP-1 is required for rhoptry targeting of RAP-2 and contributes to virulence, establishing a hierarchical role within the complex.\",\n      \"evidence\": \"RAP1-deficient and RAP2/3-deficient P. berghei ANKA mutants with mouse infection outcome assays\",\n      \"pmids\": [\"29307564\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether RAP-1 similarly chaperones RAP-2 targeting in P. falciparum not tested here\", \"Structural basis of targeting dependence unknown\"],\n      \"attribution\": [{\"species\": \"Plasmodium berghei\", \"strain\": \"ANKA\"}]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The molecular mechanism by which RAP-1 maintains parasitophorous vacuolar membrane integrity and its direct binding partners at the PVM remain unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No identified molecular target of RAP-1 at the PVM\", \"Protease responsible for Pr86 processing unidentified\", \"Functional role of the sequential p82/p67 maturation not tested\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0005515\", \"supporting_discovery_ids\": [3, 4, 5, 7]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0020008\", \"supporting_discovery_ids\": [1, 2, 3]},\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [7]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"GO:0006886\", \"supporting_discovery_ids\": [2, 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\"\n    ],\n    \"partners\": [\n      \"RAP-2\",\n      \"RAP-3\",\n      \"PfMSP-1\"\n    ],\n    \"other_free_text\": [\n      \"Synthesized as a precursor Pr86/p80 and sequentially processed to p82 then p67 by N-terminal cleavage during schizogony [#1, #3]\",\n      \"Bears a cleavable N-terminal signal peptide; maturation requires the secretory/Golgi pathway [#2]\",\n      \"Required to tag normal erythrocytes with rhoptry proteins; RAP-3 is dispensable for this [#5]\",\n      \"Dispensable for rhoptry morphology and invasion; required post-invasion for PVM integrity and intra-erythrocytic growth [#6]\",\n      \"In P. berghei ANKA, required for targeting RAP-2 to the rhoptries and contributes to virulence [#9]\",\n      \"Metalloproteinases co-isolating with the RAP-1 complex were concluded to be serum contaminants, not parasite partners [#8]\"\n    ]\n  }\n}","audit_flag":{"gene":"PF3D7_1471300","tier":"IDENTITY_CHECK","verdict":"identity unverified","subtype":"names_other_cards","uniprot_band":"","rules_fired":"R12","issue":"No cited paper names this card; 9 of 10 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_1471300","name":null,"product":"RAP protein, putative","uniprot_acc":null,"chromosome":null,"start_pos":null},{"strain":"PbANKA","gene_id":"PBANKA_1334500","name":null,"product":"RAP protein, putative","uniprot_acc":null,"chromosome":null,"start_pos":null},{"strain":"PkH","gene_id":"PKNH_1209700","name":null,"product":"RAP protein, putative","uniprot_acc":null,"chromosome":null,"start_pos":null}],"gene_symbol":"","evaluation":null}