{"gene":"PF3D7_1453600","run_date":"2026-09-08T14:19:07","timeline":{"discoveries":[{"year":1990,"finding":"RAP-1 is a rhoptry-associated protein of P. falciparum that forms a multi-component antigen complex consisting of four major proteins (80, 65, 42, and 40 kDa) and two minor proteins (77 and 70 kDa). Monoclonal antibodies against RAP-1 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 are derived from the same precursor protein.","method":"Immunoaffinity chromatography, SDS-PAGE, Western blot, monoclonal antibody inhibition assay, gene sequencing, in vitro growth inhibition assay","journal":"Molecular and biochemical parasitology","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — purification, sequencing, in vitro functional assay, and inhibition data from same study; replicated in multiple studies","pmids":["2200961","2263413"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":1992,"finding":"Inhibitory monoclonal antibodies against RAP-1 recognize linear epitopes located 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 product is absent in purified merozoites, suggesting its generation is associated with merozoite release rather than erythrocyte invasion.","method":"Epitope mapping using beta-galactosidase fusion proteins and synthetic peptides, Western blot, in vitro growth inhibition assay with purified immunoglobulin","journal":"Molecular and biochemical parasitology","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — epitope mapping with orthogonal methods (fusion proteins + synthetic peptides), functional inhibition assay, rigorously controlled","pmids":["1279419"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":1995,"finding":"Transport of RAP-1 gene products to the rhoptries is regulated by the secretory pathway. Brefeldin A and low temperature reversibly block processing of the 86-kDa precursor (Pr86) to the mature 82-kDa RAP-1 product (p82). N-ethylmaleimide, which prevents vesicle–Golgi fusion, irreversibly blocks Pr86 processing. In vitro translation revealed a cleavable N-terminal signal peptide and an ~84-kDa primary translation product that differs from the in vivo precursor Pr86, 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 1–2 / Strong — multiple orthogonal pharmacological and biochemical interventions establishing secretory pathway dependence, in vitro translation confirming signal peptide","pmids":["8719244"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":1998,"finding":"RAP-1 undergoes progressive N-terminal cleavage: the precursor Pr86 is converted to p82 and then to p67 by sequential removal of N-terminal sequences. Pr86 forms complexes containing RAP-2 product p39 and RAP-3 product p37. Processing of Pr86 begins after complexes are transported to forming rhoptries. Pr86 is present in rhoptries but not in segmenting schizonts or extracellular merozoites; p67 and p82 are major RAP-1 components in purified merozoites. Neither p67 nor p82 relocalize from the rhoptries to the merozoite surface under conditions that relocalize AMA-1.","method":"Immunoblot with epitope-specific antibodies, immunofluorescence, size fractionation, metabolic radiolabeling with brefeldin A, purified merozoite analysis","journal":"Molecular and biochemical parasitology","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (immunoblot, IFA, fractionation, size fractionation with brefeldin A block), rigorous controls, replicated processing observations","pmids":["9574915"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":1998,"finding":"A second inhibitory B-cell epitope (iB-2) near the amino terminus of p67 was identified in RAP-1. Monoclonal antibody 1D6 binds iB-2 and inhibits parasite invasion of erythrocytes in vitro. iB-2 is distinct from the previously identified iB-1 epitope (N200–Y211). Both inhibitory epitopes are located near the amino terminus of p67, a RAP-1 processing product implicated in merozoite invasion.","method":"Monoclonal antibody generation, epitope mapping, in vitro erythrocyte invasion inhibition assay","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 BN-PAGE, suggesting aggregation into larger complexes. RAP-1 was the most abundant protein detected by mass spectrometry in DRM fractions.","method":"Detergent-resistant membrane purification, blue native PAGE (BN-PAGE), mass spectrometry","journal":"Molecular and biochemical parasitology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — BN-PAGE and MS proteomics from single lab, confirms known complexes but no functional consequence directly assigned to PF3D7_1453600","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 showed that RAP-1 mutant parasites lose their capacity to tag erythrocytes, implicating RAP-1 specifically in erythrocyte tagging after merozoite release.","method":"RAP-1 gene-disruption mutants, surface iodination, erythrocyte binding assay","journal":"The Journal of infectious diseases","confidence":"High","confidence_rationale":"Tier 2 / Strong — genetic disruption mutants combined with biochemical surface iodination assay; two orthogonal approaches establishing direct function","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 normal parasitophorous vacuolar membrane (PVM) structure and intraerythrocytic parasite growth. Conditional knockdown of RAP complex members leads to altered PVM structure, delayed intraerythrocytic growth, and reduced parasitemia in infected mice.","method":"Conditional knockdown, electron microscopy (PVM morphology), growth assays in vitro and in vivo (mouse model)","journal":"Cellular microbiology","confidence":"High","confidence_rationale":"Tier 2 / Strong — conditional genetic knockdown with multiple orthogonal readouts (morphology, growth, parasitemia in vivo), clear post-invasion functional 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 parasites showed increased parasitemia early in infection but mice survived longer, indicating RAP-1 contributes to parasite virulence. RAP2/3-deficient parasites showed low parasitemia and full host recovery.","method":"Comparative genomics, RAP1-deficient and RAP2/3-deficient mutant generation, mouse infection assays","journal":"Experimental parasitology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic knockout with in vivo phenotypic readout, single lab, establishes RAP-1's role in RAP-2 trafficking to rhoptries","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. These enzymes are inhibited by EDTA (indicating metal dependence) and enhanced by cobalt. Immunoprecipitation with gelatinase-specific antisera confirmed the metalloproteinases co-purify with RAP-1, but these antisera did not react with intracellular parasites by IFA, indicating the metalloproteinases originate from human serum used in culture, not from the parasite itself.","method":"Co-purification, immunoprecipitation, proteinase inhibitor panel testing, indirect immunofluorescence","journal":"Biochimica et biophysica acta","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single co-isolation study; the metalloproteinases are concluded to be of host serum origin, limiting biological significance for RAP-1 function","pmids":["1477099"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2010,"finding":"RAP-1 was identified as a component of a large MSP-1-associated surface protein complex in P. falciparum merozoites. Pull-down experiments with anti-MSP-1 or anti-RhopH3 antibodies from merozoite lysate co-precipitated RAP-1 and RAP-2 alongside MSP-3, MSP-6, MSP-7, MSP-9, RhopH1, RhopH3, and two RAP domain-containing proteins. This complex was detected at schizont/merozoite stages but not in ring stages.","method":"Antibody pull-down from merozoite lysate, tandem mass spectrometry","journal":"Journal of proteome research","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single pulldown with MS identification, no reciprocal co-IP or functional validation specific to RAP-1 in the complex","pmids":["21175202"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]}],"current_model":"PF3D7_1453600 (RAP-1) is a rhoptry bulb protein of P. falciparum that is synthesized as a precursor (Pr86/84 kDa) carrying a cleavable N-terminal signal peptide, trafficked to the rhoptries via the secretory pathway (brefeldin A- and NEM-sensitive), and processed sequentially by N-terminal cleavages to p82 and p67; it forms the core of two low-molecular-weight rhoptry complexes with RAP-2 and RAP-3, is required for targeting RAP-2 to the rhoptries, binds the surface of normal erythrocytes after merozoite release, and functions post-invasion to maintain parasitophorous vacuolar membrane integrity and support intraerythrocytic parasite growth rather than being required for invasion itself."},"narrative":{"mechanistic_narrative":"PF3D7_1453600 (RAP-1) is a rhoptry-associated protein of P. falciparum that forms the core of a multi-component antigen complex and functions post-invasion to support intraerythrocytic parasite growth [PMID:2200961, PMID:2263413, PMID:28205319]. It is synthesized as a precursor carrying a cleavable N-terminal signal peptide and is trafficked to the rhoptries through the secretory pathway, its maturation from the 86-kDa precursor (Pr86) to mature p82 being reversibly blocked by brefeldin A and low temperature and irreversibly blocked by N-ethylmaleimide [PMID:8719244]. Following transport to forming rhoptries, Pr86 undergoes progressive N-terminal cleavage to p82 and then p67, and assembles into low-molecular-weight complexes with the RAP-2 product p39 and the RAP-3 product p37 [PMID:9574915, PMID:17553576]. RAP-1 is required for targeting RAP-2 to the rhoptries [PMID:29307564], and after merozoite release it binds the surface of normal erythrocytes, a tagging activity lost in RAP-1-disruption mutants [PMID:17624849]. Rather than being required for rhoptry morphology or erythrocyte invasion, the RAP complex acts post-invasion to maintain normal parasitophorous vacuolar membrane structure and support intraerythrocytic growth, with conditional knockdown producing altered PVM, delayed growth, and reduced parasitemia [PMID:28205319]. Monoclonal antibodies against RAP-1, including those recognizing inhibitory epitopes near the p80→p65 cleavage site and near the N-terminus of p67, inhibit parasite growth and invasion in vitro [PMID:2200961, PMID:2263413, PMID:1279419, PMID:9423886].","teleology":[{"year":1990,"claim":"Establishing that RAP-1 is a rhoptry-associated multi-protein antigen whose components derive from a single precursor addressed whether these co-purifying proteins represent one functional entity and a candidate for growth-inhibitory immunity.","evidence":"Immunoaffinity purification, SDS-PAGE, sequencing, and monoclonal antibody growth-inhibition assay in P. falciparum","pmids":["2200961","2263413"],"confidence":"High","gaps":["The precise molecular function of RAP-1 was not defined","The identity of the cleavage events generating the smaller components was not resolved"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":1992,"claim":"Mapping inhibitory epitopes relative to the p80→p65 cleavage site tied antibody-mediated growth inhibition to a specific processing event and linked p65 generation to merozoite release rather than invasion.","evidence":"Epitope mapping with fusion proteins and synthetic peptides plus in vitro growth inhibition in P. falciparum","pmids":["1279419"],"confidence":"High","gaps":["The protease responsible for the p80→p65 cleavage was not identified","The functional role of p65 was not established"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":1995,"claim":"Defining the secretory-pathway dependence of RAP-1 maturation established how the protein reaches the rhoptries and revealed a signal peptide plus an unaccounted-for modification during maturation.","evidence":"Brefeldin A, low-temperature and NEM blocks, in vitro translation, and immunoprecipitation in P. falciparum","pmids":["8719244"],"confidence":"High","gaps":["The nature of the modification distinguishing the ~84-kDa translation product from Pr86 was not identified","The trafficking receptors/machinery routing RAP-1 to rhoptries were not defined"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":1998,"claim":"Ordering the sequential N-terminal cleavages (Pr86→p82→p67) and showing complex assembly precedes processing clarified the maturation sequence and demonstrated RAP-1 stays rhoptry-resident rather than relocalizing to the merozoite surface.","evidence":"Epitope-specific immunoblot, IFA, size fractionation with brefeldin A block, and purified merozoite analysis in P. falciparum","pmids":["9574915"],"confidence":"High","gaps":["The proteases performing the sequential cleavages were not identified","The functional consequence of each cleavage step was not determined"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":1998,"claim":"Identifying a second inhibitory epitope near the N-terminus of p67 reinforced p67 as an antibody-accessible, functionally relevant processing product implicated in invasion.","evidence":"Monoclonal antibody 1D6 generation, epitope mapping, and in vitro invasion inhibition in P. falciparum","pmids":["9423886"],"confidence":"Medium","gaps":["Single-lab finding not independently confirmed","The molecular basis by which anti-p67 antibodies block invasion was not defined"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2007,"claim":"Demonstrating that RAP-1 is the core of two low-molecular-weight DRM complexes with RAP-2 and RAP-3 defined its biochemical partners and membrane association.","evidence":"Detergent-resistant membrane purification, BN-PAGE, and mass spectrometry in P. falciparum","pmids":["17553576"],"confidence":"Medium","gaps":["No functional consequence was assigned directly to RAP-1 within these complexes","The stoichiometry and higher-order aggregation state were not resolved"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2007,"claim":"Genetic disruption combined with surface iodination showed RAP-1 is specifically required to tag normal erythrocytes after merozoite release, assigning it a discrete cell-surface binding activity.","evidence":"RAP-1 gene-disruption mutants, surface iodination, and erythrocyte binding assays in P. falciparum","pmids":["17624849"],"confidence":"High","gaps":["The erythrocyte receptor bound by RAP-1 was not identified","The physiological purpose of erythrocyte tagging was not established"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2017,"claim":"Conditional knockdown redefined the RAP complex as dispensable for invasion but essential post-invasion for PVM integrity and intraerythrocytic growth, overturning an assumed invasion role.","evidence":"Conditional knockdown, electron microscopy, and in vitro/in vivo growth assays in P. falciparum and P. berghei ANKA","pmids":["28205319"],"confidence":"High","gaps":["The molecular mechanism linking RAP-1 to PVM structure was not defined","Whether RAP-1 acts directly at the PVM or via its complex partners was not distinguished"],"attribution":[{"species":"Plasmodium falciparum","strain":""},{"species":"Plasmodium berghei","strain":"ANKA"}]},{"year":2018,"claim":"In P. berghei, knockout established RAP-1 as required for RAP-2 rhoptry targeting and as a contributor to virulence, connecting complex assembly to infection outcome.","evidence":"Comparative genomics, RAP1- and RAP2/3-deficient mutants, and mouse infection assays in P. berghei ANKA","pmids":["29307564"],"confidence":"Medium","gaps":["Single-lab finding","The mechanism by which RAP-1 directs RAP-2 to rhoptries was not resolved","Whether the virulence phenotype reflects the PVM/growth role was not tested"],"attribution":[{"species":"Plasmodium berghei","strain":"ANKA"}]},{"year":null,"claim":"The direct molecular mechanism by which RAP-1 maintains PVM integrity and supports intraerythrocytic growth, and the identity of its erythrocyte-surface receptor, remain unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No biochemical activity assigned to RAP-1 beyond complex assembly and erythrocyte binding","No structural model of RAP-1 or its complexes","The protease(s) generating p82/p67 remain unidentified"],"attribution":[]}],"mechanism_profile":{"molecular_activity":[],"localization":[],"pathway":[],"complexes":["RAP1/RAP2 low-molecular-weight rhoptry complex","RAP1/RAP3 low-molecular-weight rhoptry complex"],"partners":["RAP-2 (P39)","RAP-3 (P37)"],"other_free_text":["Synthesized as precursor Pr86 with cleavable N-terminal signal peptide; processed sequentially to p82 then p67","Required for targeting RAP-2 to the rhoptries (shown in P. berghei ANKA) [#8]","Binds the surface of normal erythrocytes after merozoite release; tagging lost in RAP-1 disruption mutants [#6]","Post-invasion role in maintaining parasitophorous vacuolar membrane integrity and intraerythrocytic growth [#7]","Contributes to parasite virulence in the P. berghei mouse model [#8]","Co-isolated matrix metalloproteinases were concluded to be of host serum origin, not parasite-derived [#9]","Detected in an MSP-1-associated merozoite surface protein complex by pull-down/MS without reciprocal validation [#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 falciparum.","date":"1998","source":"Genetics","url":"https://pubmed.ncbi.nlm.nih.gov/9584096","citation_count":213,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["RAP"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"2263413","id":"PMC_2263413","title":"A rhoptry antigen of Plasmodium falciparum is protective in Saimiri monkeys.","date":"1990","source":"Parasitology","url":"https://pubmed.ncbi.nlm.nih.gov/2263413","citation_count":92,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["RAP"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"2200961","id":"PMC_2200961","title":"Characterisation and sequence of a protective rhoptry antigen from Plasmodium falciparum.","date":"1990","source":"Molecular and biochemical parasitology","url":"https://pubmed.ncbi.nlm.nih.gov/2200961","citation_count":90,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["RAP"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"17553576","id":"PMC_17553576","title":"Identification of protein complexes in detergent-resistant membranes of Plasmodium falciparum schizonts.","date":"2007","source":"Molecular and biochemical parasitology","url":"https://pubmed.ncbi.nlm.nih.gov/17553576","citation_count":73,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["RAP"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"11196674","id":"PMC_11196674","title":"Human genetic factors related to susceptibility to mild malaria in Gabon.","date":"2000","source":"Genes and immunity","url":"https://pubmed.ncbi.nlm.nih.gov/11196674","citation_count":65,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["RAP"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"1279419","id":"PMC_1279419","title":"Inhibitory monoclonal antibodies recognise epitopes adjacent to a proteolytic cleavage site on the RAP-1 protein of Plasmodium falciparum.","date":"1992","source":"Molecular and biochemical parasitology","url":"https://pubmed.ncbi.nlm.nih.gov/1279419","citation_count":55,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["RAP"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"11502528","id":"PMC_11502528","title":"Limonene arrests parasite development and inhibits isoprenylation of proteins in Plasmodium falciparum.","date":"2001","source":"Antimicrobial agents and chemotherapy","url":"https://pubmed.ncbi.nlm.nih.gov/11502528","citation_count":55,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["RAP"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"20823210","id":"PMC_20823210","title":"Multiple antigen peptide vaccines against Plasmodium falciparum malaria.","date":"2010","source":"Infection and immunity","url":"https://pubmed.ncbi.nlm.nih.gov/20823210","citation_count":51,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["PfRAP"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"8719244","id":"PMC_8719244","title":"The secretary pathway of plasmodium falciparum regulates transport of p82/RAP1 to the rhoptries.","date":"1995","source":"Molecular and biochemical parasitology","url":"https://pubmed.ncbi.nlm.nih.gov/8719244","citation_count":40,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["RAP"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"9574915","id":"PMC_9574915","title":"Analysis of the processing of Plasmodium falciparum rhoptry-associated protein 1 and localization of Pr86 to schizont rhoptries and p67 to free merozoites.","date":"1998","source":"Molecular and biochemical parasitology","url":"https://pubmed.ncbi.nlm.nih.gov/9574915","citation_count":34,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["RAP"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"9423886","id":"PMC_9423886","title":"Analysis of inhibitory epitopes in the Plasmodium falciparum rhoptry protein RAP-1 including identification of a second inhibitory epitope.","date":"1998","source":"Infection and immunity","url":"https://pubmed.ncbi.nlm.nih.gov/9423886","citation_count":33,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["RAP"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"9169771","id":"PMC_9169771","title":"Assessment of the humoral immune response against Plasmodium falciparum rhoptry-associated proteins 1 and 2.","date":"1997","source":"Infection and immunity","url":"https://pubmed.ncbi.nlm.nih.gov/9169771","citation_count":33,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["RAP"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"12076768","id":"PMC_12076768","title":"Plasmodium falciparum MAEBL is a unique member of the ebl family.","date":"2002","source":"Molecular and biochemical parasitology","url":"https://pubmed.ncbi.nlm.nih.gov/12076768","citation_count":32,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["RAP"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"10497996","id":"PMC_10497996","title":"Immune responses against Plasmodium falciparum asexual blood-stage antigens and disease susceptibility in Gabonese and Cameroonian children.","date":"1999","source":"The American journal of tropical medicine and hygiene","url":"https://pubmed.ncbi.nlm.nih.gov/10497996","citation_count":31,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["RAP"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"21175202","id":"PMC_21175202","title":"Proteome analysis reveals a large merozoite surface protein-1 associated complex on the Plasmodium falciparum merozoite surface.","date":"2010","source":"Journal of proteome research","url":"https://pubmed.ncbi.nlm.nih.gov/21175202","citation_count":31,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["RAP","PfRAP"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"28205319","id":"PMC_28205319","title":"The Plasmodium rhoptry associated protein complex is important for parasitophorous vacuole membrane structure and intraerythrocytic parasite growth.","date":"2017","source":"Cellular microbiology","url":"https://pubmed.ncbi.nlm.nih.gov/28205319","citation_count":30,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["RAP"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"17624849","id":"PMC_17624849","title":"Members of the low-molecular-mass rhoptry protein complex of Plasmodium falciparum bind to the surface of normal erythrocytes.","date":"2007","source":"The Journal of infectious diseases","url":"https://pubmed.ncbi.nlm.nih.gov/17624849","citation_count":30,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["RAP"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"8418048","id":"PMC_8418048","title":"Specific T-cell recognition of the merozoite proteins rhoptry-associated protein 1 and erythrocyte-binding antigen 1 of Plasmodium falciparum.","date":"1993","source":"Infection and immunity","url":"https://pubmed.ncbi.nlm.nih.gov/8418048","citation_count":30,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["RAP"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"8506119","id":"PMC_8506119","title":"Tumour necrosis factor and interleukin-6 production induced by components associated with merozoite proteins of Plasmodium falciparum.","date":"1993","source":"Parasite immunology","url":"https://pubmed.ncbi.nlm.nih.gov/8506119","citation_count":30,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["RAP"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"19695213","id":"PMC_19695213","title":"Mechanisms of malarial anaemia: potential involvement of the Plasmodium falciparum low molecular weight rhoptry-associated proteins.","date":"2009","source":"Acta tropica","url":"https://pubmed.ncbi.nlm.nih.gov/19695213","citation_count":27,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["RAP"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"10581610","id":"PMC_10581610","title":"IgG reactivities against recombinant Rhoptry-Associated Protein-1 (rRAP-1) are associated with mixed Plasmodium infections and protection against disease in Tanzanian children.","date":"1999","source":"Parasitology","url":"https://pubmed.ncbi.nlm.nih.gov/10581610","citation_count":25,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["RAP"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"28748223","id":"PMC_28748223","title":"PhenoPlasm: a database of disruption phenotypes for malaria parasite genes.","date":"2017","source":"Wellcome open research","url":"https://pubmed.ncbi.nlm.nih.gov/28748223","citation_count":24,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["RAP"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"12643865","id":"PMC_12643865","title":"Does infection with Human Immunodeficiency Virus affect the antibody responses to Plasmodium falciparum antigenic determinants in asymptomatic pregnant women?","date":"2003","source":"The Journal of infection","url":"https://pubmed.ncbi.nlm.nih.gov/12643865","citation_count":23,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["RAP"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"20363375","id":"PMC_20363375","title":"Evidence for negative selection on the gene encoding rhoptry-associated protein 1 (RAP-1) in Plasmodium spp.","date":"2010","source":"Infection, genetics and evolution : journal of molecular epidemiology and evolutionary genetics in infectious diseases","url":"https://pubmed.ncbi.nlm.nih.gov/20363375","citation_count":22,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["RAP"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"9347514","id":"PMC_9347514","title":"Antibody responses to Rhoptry-Associated Protein-1 (RAP-1) of Plasmodium falciparum parasites in humans from areas of different malaria endemicity.","date":"1997","source":"Parasite immunology","url":"https://pubmed.ncbi.nlm.nih.gov/9347514","citation_count":20,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["RAP"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"1560416","id":"PMC_1560416","title":"Molecular factors responsible for host cell recognition and invasion in Plasmodium falciparum.","date":"1992","source":"The Journal of protozoology","url":"https://pubmed.ncbi.nlm.nih.gov/1560416","citation_count":19,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["RAP"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"8784775","id":"PMC_8784775","title":"Limited RAP-1 sequence diversity in field isolates of Plasmodium falciparum.","date":"1996","source":"Molecular and biochemical parasitology","url":"https://pubmed.ncbi.nlm.nih.gov/8784775","citation_count":19,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["RAP"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"8834763","id":"PMC_8834763","title":"Immunogenicity of recombinant Plasmodium falciparum rhoptry associated proteins 1 and 2.","date":"1995","source":"Parasite immunology","url":"https://pubmed.ncbi.nlm.nih.gov/8834763","citation_count":17,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["RAP"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"11254620","id":"PMC_11254620","title":"Rhoptry-associated protein 1-binding monoclonal antibody raised against a heterologous peptide sequence inhibits Plasmodium falciparum growth in vitro.","date":"2001","source":"Infection and immunity","url":"https://pubmed.ncbi.nlm.nih.gov/11254620","citation_count":16,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["RAP"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"18928377","id":"PMC_18928377","title":"Effect of placental malaria and HIV infection on the antibody responses to Plasmodium falciparum in infants.","date":"2008","source":"The Journal of infectious 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 Asian journal of tropical medicine and public health","url":"https://pubmed.ncbi.nlm.nih.gov/1298072","citation_count":7,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["RAP"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"7606209","id":"PMC_7606209","title":"Characterization of a new 60 kDa apical protein of Plasmodium falciparum merozoite expressed in late schizogony.","date":"1994","source":"Biology of the cell","url":"https://pubmed.ncbi.nlm.nih.gov/7606209","citation_count":7,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["RAP"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"20833215","id":"PMC_20833215","title":"Conserved regions of the Plasmodium falciparum rhoptry-associated protein 3 mediate specific host-pathogen interactions during invasion of red blood cells.","date":"2010","source":"Peptides","url":"https://pubmed.ncbi.nlm.nih.gov/20833215","citation_count":4,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["RAP"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"36588415","id":"PMC_36588415","title":"Genetic Diversity and Clustering of the Rhoptry Associated Protein-1 of Plasmodium knowlesi from Peninsular Malaysia and Malaysian Borneo.","date":"2022","source":"The Korean journal of parasitology","url":"https://pubmed.ncbi.nlm.nih.gov/36588415","citation_count":3,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["PfRAP"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"1477099","id":"PMC_1477099","title":"Three matrix metalloproteinases form a non-covalent association with the rhoptry-associated protein-1 of Plasmodium falciparum.","date":"1992","source":"Biochimica et biophysica 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":45620,"output_tokens":3889,"usd":0.157953,"retried_sync":true},"stage2":{"model":"claude-opus-4-8","input_tokens":9287,"output_tokens":3899,"usd":0.071955,"stage2_stop_reason":"end_turn"},"total_usd":0.229908,"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 rhoptry-associated protein of P. falciparum that forms a multi-component antigen complex consisting of four major proteins (80, 65, 42, and 40 kDa) and two minor proteins (77 and 70 kDa). Monoclonal antibodies against RAP-1 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 are derived from the same precursor protein.\",\n      \"method\": \"Immunoaffinity chromatography, SDS-PAGE, Western blot, monoclonal antibody inhibition assay, gene sequencing, in vitro growth inhibition assay\",\n      \"journal\": \"Molecular and biochemical parasitology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — purification, sequencing, in vitro functional assay, and inhibition data from same study; replicated in multiple studies\",\n      \"pmids\": [\"2200961\", \"2263413\"],\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 located 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 product is absent in purified merozoites, suggesting its generation is associated with merozoite release rather than erythrocyte invasion.\",\n      \"method\": \"Epitope mapping using beta-galactosidase fusion proteins and synthetic peptides, Western blot, in vitro growth inhibition assay with purified immunoglobulin\",\n      \"journal\": \"Molecular and biochemical parasitology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — epitope mapping with orthogonal methods (fusion proteins + synthetic peptides), functional inhibition assay, rigorously controlled\",\n      \"pmids\": [\"1279419\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 1995,\n      \"finding\": \"Transport of RAP-1 gene products to the rhoptries is regulated by the secretory pathway. Brefeldin A and low temperature reversibly block processing of the 86-kDa precursor (Pr86) to the mature 82-kDa RAP-1 product (p82). N-ethylmaleimide, which prevents vesicle–Golgi fusion, irreversibly blocks Pr86 processing. In vitro translation revealed a cleavable N-terminal signal peptide and an ~84-kDa primary translation product that differs from the in vivo precursor Pr86, 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 1–2 / Strong — multiple orthogonal pharmacological and biochemical interventions establishing secretory pathway dependence, in vitro translation confirming signal peptide\",\n      \"pmids\": [\"8719244\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"RAP-1 undergoes progressive N-terminal cleavage: the precursor Pr86 is converted to p82 and then to p67 by sequential removal of N-terminal sequences. Pr86 forms complexes containing RAP-2 product p39 and RAP-3 product p37. Processing of Pr86 begins after complexes are transported to forming rhoptries. Pr86 is present in rhoptries but not in segmenting schizonts or extracellular merozoites; p67 and p82 are major RAP-1 components in purified merozoites. Neither p67 nor p82 relocalize from the rhoptries to the merozoite surface under conditions that relocalize AMA-1.\",\n      \"method\": \"Immunoblot with epitope-specific antibodies, immunofluorescence, size fractionation, metabolic radiolabeling with brefeldin A, purified merozoite analysis\",\n      \"journal\": \"Molecular and biochemical parasitology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (immunoblot, IFA, fractionation, size fractionation with brefeldin A block), rigorous controls, replicated processing observations\",\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) near the amino terminus of p67 was identified in RAP-1. Monoclonal antibody 1D6 binds iB-2 and inhibits parasite invasion of erythrocytes in vitro. iB-2 is distinct from the previously identified iB-1 epitope (N200–Y211). Both inhibitory epitopes are located near the amino terminus of p67, a RAP-1 processing product implicated in merozoite invasion.\",\n      \"method\": \"Monoclonal antibody generation, epitope mapping, in vitro erythrocyte invasion inhibition assay\",\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 BN-PAGE, suggesting aggregation into larger complexes. RAP-1 was the most abundant protein detected by mass spectrometry in DRM fractions.\",\n      \"method\": \"Detergent-resistant membrane 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 and MS proteomics from single lab, confirms known complexes but no functional consequence directly assigned to PF3D7_1453600\",\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 showed that RAP-1 mutant parasites lose their capacity to tag erythrocytes, implicating RAP-1 specifically in erythrocyte tagging after merozoite release.\",\n      \"method\": \"RAP-1 gene-disruption mutants, surface iodination, erythrocyte binding assay\",\n      \"journal\": \"The Journal of infectious diseases\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — genetic disruption mutants combined with biochemical surface iodination assay; two orthogonal approaches establishing direct function\",\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 normal parasitophorous vacuolar membrane (PVM) structure and intraerythrocytic parasite growth. Conditional knockdown of RAP complex members leads to altered PVM structure, delayed intraerythrocytic growth, and reduced parasitemia in infected mice.\",\n      \"method\": \"Conditional knockdown, electron microscopy (PVM morphology), growth assays in vitro and in vivo (mouse model)\",\n      \"journal\": \"Cellular microbiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — conditional genetic knockdown with multiple orthogonal readouts (morphology, growth, parasitemia in vivo), clear post-invasion functional 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 parasites showed increased parasitemia early in infection but mice survived longer, indicating RAP-1 contributes to parasite virulence. RAP2/3-deficient parasites showed low parasitemia and full host recovery.\",\n      \"method\": \"Comparative genomics, RAP1-deficient and RAP2/3-deficient mutant generation, mouse infection assays\",\n      \"journal\": \"Experimental parasitology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic knockout with in vivo phenotypic readout, single lab, establishes RAP-1's role in RAP-2 trafficking to rhoptries\",\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. These enzymes are inhibited by EDTA (indicating metal dependence) and enhanced by cobalt. Immunoprecipitation with gelatinase-specific antisera confirmed the metalloproteinases co-purify with RAP-1, but these antisera did not react with intracellular parasites by IFA, indicating the metalloproteinases originate from human serum used in culture, not from the parasite itself.\",\n      \"method\": \"Co-purification, immunoprecipitation, proteinase inhibitor panel testing, indirect immunofluorescence\",\n      \"journal\": \"Biochimica et biophysica acta\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single co-isolation study; the metalloproteinases are concluded to be of host serum origin, limiting biological significance for RAP-1 function\",\n      \"pmids\": [\"1477099\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"RAP-1 was identified as a component of a large MSP-1-associated surface protein complex in P. falciparum merozoites. Pull-down experiments with anti-MSP-1 or anti-RhopH3 antibodies from merozoite lysate co-precipitated RAP-1 and RAP-2 alongside MSP-3, MSP-6, MSP-7, MSP-9, RhopH1, RhopH3, and two RAP domain-containing proteins. This complex was detected at schizont/merozoite stages but not in ring stages.\",\n      \"method\": \"Antibody pull-down from merozoite lysate, tandem mass spectrometry\",\n      \"journal\": \"Journal of proteome research\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single pulldown with MS identification, no reciprocal co-IP or functional validation specific to RAP-1 in the complex\",\n      \"pmids\": [\"21175202\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    }\n  ],\n  \"current_model\": \"PF3D7_1453600 (RAP-1) is a rhoptry bulb protein of P. falciparum that is synthesized as a precursor (Pr86/84 kDa) carrying a cleavable N-terminal signal peptide, trafficked to the rhoptries via the secretory pathway (brefeldin A- and NEM-sensitive), and processed sequentially by N-terminal cleavages to p82 and p67; it forms the core of two low-molecular-weight rhoptry complexes with RAP-2 and RAP-3, is required for targeting RAP-2 to the rhoptries, binds the surface of normal erythrocytes after merozoite release, and functions post-invasion to maintain parasitophorous vacuolar membrane integrity and support intraerythrocytic parasite growth rather than being required for invasion itself.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"PF3D7_1453600 (RAP-1) is a rhoptry-associated protein of P. falciparum that forms the core of a multi-component antigen complex and functions post-invasion to support intraerythrocytic parasite growth [#0, #7]. It is synthesized as a precursor carrying a cleavable N-terminal signal peptide and is trafficked to the rhoptries through the secretory pathway, its maturation from the 86-kDa precursor (Pr86) to mature p82 being reversibly blocked by brefeldin A and low temperature and irreversibly blocked by N-ethylmaleimide [#2]. Following transport to forming rhoptries, Pr86 undergoes progressive N-terminal cleavage to p82 and then p67, and assembles into low-molecular-weight complexes with the RAP-2 product p39 and the RAP-3 product p37 [#3, #5]. RAP-1 is required for targeting RAP-2 to the rhoptries [#8], and after merozoite release it binds the surface of normal erythrocytes, a tagging activity lost in RAP-1-disruption mutants [#6]. Rather than being required for rhoptry morphology or erythrocyte invasion, the RAP complex acts post-invasion to maintain normal parasitophorous vacuolar membrane structure and support intraerythrocytic growth, with conditional knockdown producing altered PVM, delayed growth, and reduced parasitemia [#7]. Monoclonal antibodies against RAP-1, including those recognizing inhibitory epitopes near the p80\\u2192p65 cleavage site and near the N-terminus of p67, inhibit parasite growth and invasion in vitro [#0, #1, #4].\"\n,\n  \"teleology\": [\n    {\n      \"year\": 1990,\n      \"claim\": \"Establishing that RAP-1 is a rhoptry-associated multi-protein antigen whose components derive from a single precursor addressed whether these co-purifying proteins represent one functional entity and a candidate for growth-inhibitory immunity.\",\n      \"evidence\": \"Immunoaffinity purification, SDS-PAGE, sequencing, and monoclonal antibody growth-inhibition assay in P. falciparum\",\n      \"pmids\": [\"2200961\", \"2263413\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"The precise molecular function of RAP-1 was not defined\", \"The identity of the cleavage events generating the smaller components was not resolved\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 1992,\n      \"claim\": \"Mapping inhibitory epitopes relative to the p80\\u2192p65 cleavage site tied antibody-mediated growth inhibition to a specific processing event and linked p65 generation to merozoite release rather than invasion.\",\n      \"evidence\": \"Epitope mapping with fusion proteins and synthetic peptides plus in vitro growth inhibition in P. falciparum\",\n      \"pmids\": [\"1279419\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"The protease responsible for the p80\\u2192p65 cleavage was not identified\", \"The functional role of p65 was not established\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 1995,\n      \"claim\": \"Defining the secretory-pathway dependence of RAP-1 maturation established how the protein reaches the rhoptries and revealed a signal peptide plus an unaccounted-for modification during maturation.\",\n      \"evidence\": \"Brefeldin A, low-temperature and NEM blocks, in vitro translation, and immunoprecipitation in P. falciparum\",\n      \"pmids\": [\"8719244\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"The nature of the modification distinguishing the ~84-kDa translation product from Pr86 was not identified\", \"The trafficking receptors/machinery routing RAP-1 to rhoptries were not defined\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 1998,\n      \"claim\": \"Ordering the sequential N-terminal cleavages (Pr86\\u2192p82\\u2192p67) and showing complex assembly precedes processing clarified the maturation sequence and demonstrated RAP-1 stays rhoptry-resident rather than relocalizing to the merozoite surface.\",\n      \"evidence\": \"Epitope-specific immunoblot, IFA, size fractionation with brefeldin A block, and purified merozoite analysis in P. falciparum\",\n      \"pmids\": [\"9574915\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"The proteases performing the sequential cleavages were not identified\", \"The functional consequence of each cleavage step was not determined\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 1998,\n      \"claim\": \"Identifying a second inhibitory epitope near the N-terminus of p67 reinforced p67 as an antibody-accessible, functionally relevant processing product implicated in invasion.\",\n      \"evidence\": \"Monoclonal antibody 1D6 generation, epitope mapping, and in vitro invasion inhibition in P. falciparum\",\n      \"pmids\": [\"9423886\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single-lab finding not independently confirmed\", \"The molecular basis by which anti-p67 antibodies block invasion was not defined\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Demonstrating that RAP-1 is the core of two low-molecular-weight DRM complexes with RAP-2 and RAP-3 defined its biochemical partners and membrane association.\",\n      \"evidence\": \"Detergent-resistant membrane purification, BN-PAGE, and mass spectrometry in P. falciparum\",\n      \"pmids\": [\"17553576\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No functional consequence was assigned directly to RAP-1 within these complexes\", \"The stoichiometry and higher-order aggregation state were not resolved\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Genetic disruption combined with surface iodination showed RAP-1 is specifically required to tag normal erythrocytes after merozoite release, assigning it a discrete cell-surface binding activity.\",\n      \"evidence\": \"RAP-1 gene-disruption mutants, surface iodination, and erythrocyte binding assays in P. falciparum\",\n      \"pmids\": [\"17624849\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"The erythrocyte receptor bound by RAP-1 was not identified\", \"The physiological purpose of erythrocyte tagging was not established\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Conditional knockdown redefined the RAP complex as dispensable for invasion but essential post-invasion for PVM integrity and intraerythrocytic growth, overturning an assumed invasion role.\",\n      \"evidence\": \"Conditional knockdown, electron microscopy, and in vitro/in vivo growth assays in P. falciparum and P. berghei ANKA\",\n      \"pmids\": [\"28205319\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"The molecular mechanism linking RAP-1 to PVM structure was not defined\", \"Whether RAP-1 acts directly at the PVM or via its complex partners was not distinguished\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}, {\"species\": \"Plasmodium berghei\", \"strain\": \"ANKA\"}]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"In P. berghei, knockout established RAP-1 as required for RAP-2 rhoptry targeting and as a contributor to virulence, connecting complex assembly to infection outcome.\",\n      \"evidence\": \"Comparative genomics, RAP1- and RAP2/3-deficient mutants, and mouse infection assays in P. berghei ANKA\",\n      \"pmids\": [\"29307564\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single-lab finding\", \"The mechanism by which RAP-1 directs RAP-2 to rhoptries was not resolved\", \"Whether the virulence phenotype reflects the PVM/growth role was not tested\"],\n      \"attribution\": [{\"species\": \"Plasmodium berghei\", \"strain\": \"ANKA\"}]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The direct molecular mechanism by which RAP-1 maintains PVM integrity and supports intraerythrocytic growth, and the identity of its erythrocyte-surface receptor, remain unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No biochemical activity assigned to RAP-1 beyond complex assembly and erythrocyte binding\", \"No structural model of RAP-1 or its complexes\", \"The protease(s) generating p82/p67 remain unidentified\"],\n      \"attribution\": []\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0005102\", \"supporting_discovery_ids\": [6]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0020008\", \"supporting_discovery_ids\": [0, 3, 5]},\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [6]},\n      {\"term_id\": \"GO:0005794\", \"supporting_discovery_ids\": [2]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"GO:0009306\", \"supporting_discovery_ids\": [2, 3]},\n      {\"term_id\": \"GO:0016485\", \"supporting_discovery_ids\": [1, 3]}\n    ],\n    \"complexes\": [\n      \"RAP1/RAP2 low-molecular-weight rhoptry complex\",\n      \"RAP1/RAP3 low-molecular-weight rhoptry complex\"\n    ],\n    \"partners\": [\n      \"RAP-2 (p39)\",\n      \"RAP-3 (p37)\"\n    ],\n    \"other_free_text\": [\n      \"Synthesized as precursor Pr86 with cleavable N-terminal signal peptide; processed sequentially to p82 then p67\",\n      \"Required for targeting RAP-2 to the rhoptries (shown in P. berghei ANKA) [#8]\",\n      \"Binds the surface of normal erythrocytes after merozoite release; tagging lost in RAP-1 disruption mutants [#6]\",\n      \"Post-invasion role in maintaining parasitophorous vacuolar membrane integrity and intraerythrocytic growth [#7]\",\n      \"Contributes to parasite virulence in the P. berghei mouse model [#8]\",\n      \"Co-isolated matrix metalloproteinases were concluded to be of host serum origin, not parasite-derived [#9]\",\n      \"Detected in an MSP-1-associated merozoite surface protein complex by pull-down/MS without reciprocal validation [#10]\"\n    ]\n  }\n}","audit_flag":{"gene":"PF3D7_1453600","tier":"IDENTITY_CHECK","verdict":"identity unverified","subtype":"names_other_cards","uniprot_band":"","rules_fired":"R12","issue":"No cited paper names this card; 11 of 12 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_1453600","name":null,"product":"RAP protein, putative","uniprot_acc":null,"chromosome":null,"start_pos":null},{"strain":"PbANKA","gene_id":"PBANKA_1317300","name":null,"product":"RAP protein, putative","uniprot_acc":null,"chromosome":null,"start_pos":null},{"strain":"PkH","gene_id":"PKNH_1228500","name":null,"product":"RAP protein, putative","uniprot_acc":null,"chromosome":null,"start_pos":null}],"gene_symbol":"","evaluation":null}