{"gene":"PF3D7_0604800","run_date":"2026-09-07T10:55:52","timeline":{"discoveries":[{"year":1990,"finding":"RAP-1 is a lipophilic antigen in which disulfide bonding plays an important role in its structure. The multi-component antigen (80, 65, 42, 40 kDa plus minor components of 77, 70 kDa) is derived from a single precursor protein, as suggested by monoclonal antibody evidence, autocatalytic processing, and immunological cross-reactivity among all components.","method":"Immunoaffinity purification, SDS-PAGE, Western blot, autocatalytic processing assays, monoclonal antibody epitope analysis","journal":"Molecular and biochemical parasitology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal biochemical methods in a single lab establishing precursor-product relationship and lipophilic/disulfide nature","pmids":["2200961"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":1992,"finding":"Inhibitory monoclonal antibodies against RAP-1 map their epitopes to a region 10–20 amino acids C-terminal to the proteolytic cleavage site (at amino acid 190) where p80 is processed to p65. The p65 form is absent from purified merozoites, indicating its generation is associated with merozoite release rather than erythrocyte invasion.","method":"Beta-galactosidase fusion protein epitope mapping, synthetic peptide reactivity, Western blot, in vitro parasite growth inhibition assay, purified merozoite immunoblot","journal":"Molecular and biochemical parasitology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — epitope mapping with fusion proteins and peptides, combined with functional inhibition assay, 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 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 initial 84-kDa primary translation product, distinct from the in vivo Pr86 precursor, indicating an additional protein modification during maturation.","method":"Brefeldin A treatment, low-temperature block, N-ethylmaleimide treatment, in vitro translation, metabolic labeling, immunoprecipitation","journal":"Molecular and biochemical parasitology","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — multiple pharmacological and biochemical tools (BFA, low temperature, NEM) each independently supporting secretory pathway dependence, with in vitro translation providing direct mechanistic evidence; multiple orthogonal methods in a single rigorous study","pmids":["8719244"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":1998,"finding":"RAP-1 precursor Pr86 is processed in the rhoptries by two sequential cleavage events: rapid cleavage to p82 followed by delayed cleavage to p67. Pr86, RAP-2 product p39, and RAP-3 product p37 form complexes prior to processing. Pr86 is present transiently in rhoptries and is absent from segmenting schizonts and extracellular merozoites, whereas p67 and p82 are the major RAP-1 forms in purified merozoites. Neither p67 nor p82 relocalize from rhoptries to the merozoite surface.","method":"Immunoblot with epitope-mapped antibodies, size fractionation with BFA-blocked radiolabeling, immunofluorescence localization, purified merozoite analysis","journal":"Molecular and biochemical parasitology","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal epitope mapping, BFA-block size fractionation, immunofluorescence, and purified merozoite immunoblot all in one study; multiple orthogonal methods establishing processing sequence and localization","pmids":["9574915"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2007,"finding":"RAP-1 is the core component of two distinct low-molecular-weight rhoptry complexes (RAP1/RAP2 and RAP1/RAP3) that partition into detergent-resistant membranes (DRMs) of P. falciparum schizonts. RAP-1 predominates in high-molecular-weight species by blue native PAGE, suggesting aggregation into larger complexes than previously anticipated.","method":"Detergent-resistant membrane purification, blue native PAGE, mass spectrometry identification","journal":"Molecular and biochemical parasitology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — BN-PAGE combined with mass spectrometry identification in DRMs, single lab, establishes complex membership and unusual aggregation","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. This was demonstrated using RAP-1 gene-disruption mutant parasites in which the capacity to tag erythrocytes with surface iodination was lost, directly implicating RAP-1 in erythrocyte surface binding.","method":"RAP-1 gene-disruption mutant parasites, surface iodination experiments, antibody staining of normal erythrocytes","journal":"The Journal of infectious diseases","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic disruption with direct surface-labeling functional readout, single lab","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 intra-erythrocytic parasite growth. Conditional knockdown of RAP complex members leads to altered PVM structure, delayed intra-erythrocytic growth, and reduced parasitemia in infected mice.","method":"Conditional knockdown (reverse genetics), electron microscopy of PVM, parasite growth assays, mouse infection model","journal":"Cellular microbiology","confidence":"High","confidence_rationale":"Tier 2 / Strong — conditional knockdown with multiple orthogonal readouts (PVM ultrastructure, in vitro growth, in vivo parasitemia), directly establishing post-invasion function","pmids":["28205319"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""},{"species":"Plasmodium berghei","strain":""}]},{"year":2018,"finding":"In P. berghei, RAP-1 is required for targeting RAP-2 to the rhoptries. RAP1-deficient parasites showed increased early parasitemia but prolonged host survival, while RAP2/3-deficient parasites showed low parasitemia and host recovery, indicating RAP-1 and RAP-2/3 contribute to virulence.","method":"Generation of RAP1-deficient and RAP2/3-deficient P. berghei mutants by reverse genetics, mouse infection experiments, complementation of RAP2/3 expression","journal":"Experimental parasitology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic knockout with functional complementation in rodent malaria model; RAP-1's role in RAP-2 targeting is a direct mechanistic finding, single lab","pmids":["29307564"],"is_preprint":false,"attribution":[{"species":"Plasmodium berghei","strain":"XAT"},{"species":"Plasmodium berghei","strain":"ANKA"}]},{"year":2010,"finding":"RAP-1 was identified as part of an MSP-1-associated complex on the merozoite surface by anti-MSP-1 and anti-RhopH3 antibody pulldowns from merozoite lysates, with the complex detected at schizont/merozoite stages but not ring stages.","method":"Antibody pulldown from merozoite lysate, tandem mass spectrometry identification","journal":"Journal of proteome research","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single pulldown experiment with MS identification, no reciprocal confirmation for RAP-1 specifically, single lab","pmids":["21175202"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]}],"current_model":"PF3D7_0604800 (RAP-1) is synthesized as a precursor (Pr86) in late schizonts, contains a cleavable N-terminal signal peptide, and is transported to the rhoptries via the secretory pathway (BFA- and NEM-sensitive); once in the rhoptries it undergoes sequential proteolytic cleavage (Pr86→p82→p67) and forms the core of two low-molecular-weight complexes with RAP-2 and RAP-3 respectively; RAP-1 is required for targeting RAP-2 to the rhoptries, can bind the surface of normal erythrocytes, and while dispensable for erythrocyte invasion, the RAP complex is required post-invasion for normal parasitophorous vacuolar membrane structure and efficient intra-erythrocytic parasite growth."},"narrative":{"mechanistic_narrative":"PF3D7_0604800 (RAP-1) is a rhoptry protein that serves as the organizing core of low-molecular-weight rhoptry complexes required for post-invasion intra-erythrocytic development in Plasmodium falciparum [PMID:17553576, PMID:28205319]. It is synthesized as an 86-kDa precursor (Pr86) bearing a cleavable N-terminal signal peptide and is transported to the rhoptries through the secretory pathway, as its precursor-to-mature processing is reversibly blocked by brefeldin A and low temperature and irreversibly blocked by N-ethylmaleimide [PMID:8719244]. Within the rhoptries Pr86 undergoes sequential proteolytic maturation, first rapidly to p82 and then more slowly to p67, with these mature forms — and not the surface — being the species retained in released merozoites [PMID:2200961, PMID:9574915]. RAP-1 nucleates two distinct complexes with RAP-2 and RAP-3 respectively, which partition into detergent-resistant membranes [PMID:9574915, PMID:17553576], and in P. berghei RAP-1 is required to target RAP-2 to the rhoptries [PMID:29307564]. RAP-1 can bind the surface of normal erythrocytes [PMID:17624849], yet the RAP complex is dispensable for rhoptry morphology and erythrocyte invasion; instead, conditional knockdown shows it is required after invasion for normal parasitophorous vacuolar membrane structure, efficient intra-erythrocytic growth, and virulence in mice [PMID:28205319, PMID:29307564].","teleology":[{"year":1990,"claim":"Establishing that the multiple RAP-1 antigen bands are one protein resolved the question of whether the immunodominant rhoptry species were distinct antigens or products of a single precursor.","evidence":"Immunoaffinity purification, SDS-PAGE, monoclonal antibody epitope analysis and autocatalytic processing assays in P. falciparum","pmids":["2200961"],"confidence":"Medium","gaps":["Protease responsible for processing not identified","Functional role of the lipophilic/disulfide-bonded structure not defined"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":1992,"claim":"Mapping inhibitory antibody epitopes near the cleavage site and showing p65 is absent from merozoites tied RAP-1 processing to merozoite release rather than to invasion itself.","evidence":"Fusion-protein and synthetic-peptide epitope mapping with in vitro growth-inhibition assays and purified merozoite immunoblots in P. falciparum","pmids":["1279419"],"confidence":"Medium","gaps":["Mechanism by which epitope-directed antibodies inhibit growth not established","Timing of cleavage relative to release not directly imaged"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":1995,"claim":"Pharmacological dissection showed RAP-1 reaches the rhoptries via the classical secretory pathway, placing its maturation within a defined trafficking route.","evidence":"Brefeldin A, low-temperature and N-ethylmaleimide blocks plus in vitro translation and metabolic labeling in P. falciparum","pmids":["8719244"],"confidence":"High","gaps":["Nature of the modification distinguishing the 84-kDa primary product from Pr86 not identified","Rhoptry-targeting signal within RAP-1 not mapped"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":1998,"claim":"Resolving the ordered Pr86→p82→p67 cleavage and showing complex assembly precedes processing defined the biogenesis sequence of RAP-1 and its partners.","evidence":"Epitope-mapped immunoblotting, BFA-block size fractionation, immunofluorescence and purified merozoite analysis in P. falciparum","pmids":["9574915"],"confidence":"High","gaps":["Identity of the processing protease unknown","Functional consequence of the delayed p82→p67 cleavage not defined"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2007,"claim":"Biochemical fractionation defined RAP-1 as the shared core of two membrane-associated complexes, refining its role from single antigen to a complex-organizing subunit.","evidence":"Detergent-resistant membrane purification, blue native PAGE and mass spectrometry in P. falciparum schizonts","pmids":["17553576"],"confidence":"Medium","gaps":["Stoichiometry and composition of the high-molecular-weight species not resolved","Functional significance of DRM partitioning not tested"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2007,"claim":"Gene disruption showed RAP-1 mediates binding of the parasite to the surface of normal erythrocytes, assigning it a direct erythrocyte-interaction activity.","evidence":"RAP-1 gene-disruption mutants with surface iodination and antibody staining of normal erythrocytes in P. falciparum","pmids":["17624849"],"confidence":"Medium","gaps":["Erythrocyte receptor for RAP-1 not identified","Physiological role of surface binding relative to invasion not defined"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2017,"claim":"Conditional knockdown reassigned the RAP complex from a presumed invasion factor to a post-invasion effector needed for PVM integrity and intra-erythrocytic growth.","evidence":"Conditional knockdown, PVM electron microscopy, growth assays and mouse infection in P. falciparum and P. berghei","pmids":["28205319"],"confidence":"High","gaps":["Molecular mechanism linking RAP complex to PVM structure unknown","RAP-1-specific contribution versus other complex members not isolated"],"attribution":[{"species":"Plasmodium falciparum","strain":""},{"species":"Plasmodium berghei","strain":""}]},{"year":2018,"claim":"Knockout and complementation in P. berghei established RAP-1 as required for rhoptry targeting of RAP-2 and as a contributor to virulence.","evidence":"RAP1- and RAP2/3-deficient P. berghei mutants with complementation and mouse infection","pmids":["29307564"],"confidence":"Medium","gaps":["Mechanism of RAP-2 targeting by RAP-1 not defined","Basis of the differing parasitemia/survival phenotypes across mutants unresolved"],"attribution":[{"species":"Plasmodium berghei","strain":"XAT"},{"species":"Plasmodium berghei","strain":"ANKA"}]},{"year":null,"claim":"The molecular activity by which RAP-1 and its complex shape the parasitophorous vacuolar membrane, and the identity of its processing protease and erythrocyte receptor, remain unknown.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No enzymatic or structural mechanism for the RAP complex's post-invasion function","Processing protease unidentified","Erythrocyte surface receptor unidentified"],"attribution":[]}],"mechanism_profile":{"molecular_activity":[],"localization":[],"pathway":[],"complexes":["RAP-1/RAP-2 rhoptry complex","RAP-1/RAP-3 rhoptry complex","MSP-1-associated merozoite surface complex (Low-confidence)"],"partners":["RAP-2","RAP-3","MSP-1 (LOW-CONFIDENCE)","RHOPH3 (LOW-CONFIDENCE)"],"other_free_text":["Synthesized as an 86-kDa precursor (Pr86) with a cleavable N-terminal signal peptide; sequentially processed to p82 then p67 within the rhoptries [#0, #2, #3].","Lipophilic antigen whose structure depends on disulfide bonding [#0].","Partitions into detergent-resistant membranes of schizonts [#4].","In P. berghei, required for targeting RAP-2 to the rhoptries [#7].","RAP complex is dispensable for erythrocyte invasion but required post-invasion for normal PVM structure and intra-erythrocytic growth [#6]."]}},"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 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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":"11114416","id":"PMC_11114416","title":"Putting the rap on integrin activation.","date":"2000","source":"Immunology today","url":"https://pubmed.ncbi.nlm.nih.gov/11114416","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":23002,"output_tokens":3256,"usd":0.058923,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":8341,"output_tokens":3344,"usd":0.062652,"stage2_stop_reason":"end_turn"},"total_usd":0.121575,"stage1_batch_id":"msgbatch_01DbiymDmubkPpYvdbAu5a7V","stage2_batch_id":"msgbatch_012TbrWvMRH129T7PQ4SmvrJ","note":"batch pricing = 50% of standard"},"stage1_raw":"Looking at the corpus, I need to identify which papers are about PF3D7_0604800, the RAP protein putative (which, based on context, appears to be RAP-1, the rhoptry-associated protein 1 of P. falciparum). I need to be careful to:\n1. Focus on RAP-1 (PF3D7_0604800) specifically, not RAP-2, RAP-3, or other family members\n2. Extract mechanistic findings only\n3. Exclude epidemiology, immunogenicity studies, and vaccine trials without mechanistic content\n\nLet me go through the relevant papers:\n\n- Paper [4]: RAP-1 characterization - lipophilic, disulfide bonding, processing from precursor\n- Paper [7]: RAP-1 processing p80→p65, inhibitory epitopes mapped, p65 absent in purified merozoites\n- Paper [11]: Secretory pathway controls RAP-1 transport to rhoptries; BFA and low temperature block processing; N-terminal signal peptide\n- Paper [12]: RAP-1 processing details: Pr86→p82→p67; complex formation; rhoptry localization\n- Paper [18]: RAP complex not required for invasion but required for post-invasion PVM structure and parasite growth\n- Paper [19]: RAP-1 (and RAP-2) bind surface of normal erythrocytes; shown with RAP-1 gene disruption mutants\n- Paper [37]: RAP-1 required for targeting RAP-2 to rhoptries (P. berghei)\n- Paper [5]: RAP-1 is core component of two RAP complexes (RAP1/2 and RAP1/3) identified in DRMs\n- Paper [43]: Three metalloproteinases co-isolated with RAP-1 complex (from human serum, not parasite)\n- Paper [17]: RAP-1 identified in MSP-1 associated complex by pulldown/MS\n\n```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 1990,\n      \"finding\": \"RAP-1 is a lipophilic antigen in which disulfide bonding plays an important role in its structure. The multi-component antigen (80, 65, 42, 40 kDa plus minor components of 77, 70 kDa) is derived from a single precursor protein, as suggested by monoclonal antibody evidence, autocatalytic processing, and immunological cross-reactivity among all components.\",\n      \"method\": \"Immunoaffinity purification, SDS-PAGE, Western blot, autocatalytic processing assays, monoclonal antibody epitope analysis\",\n      \"journal\": \"Molecular and biochemical parasitology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal biochemical methods in a single lab establishing precursor-product relationship and lipophilic/disulfide nature\",\n      \"pmids\": [\"2200961\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 1992,\n      \"finding\": \"Inhibitory monoclonal antibodies against RAP-1 map their epitopes to a region 10–20 amino acids C-terminal to the proteolytic cleavage site (at amino acid 190) where p80 is processed to p65. The p65 form is absent from purified merozoites, indicating its generation is associated with merozoite release rather than erythrocyte invasion.\",\n      \"method\": \"Beta-galactosidase fusion protein epitope mapping, synthetic peptide reactivity, Western blot, in vitro parasite growth inhibition assay, purified merozoite immunoblot\",\n      \"journal\": \"Molecular and biochemical parasitology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — epitope mapping with fusion proteins and peptides, combined with functional inhibition assay, single lab\",\n      \"pmids\": [\"1279419\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 1995,\n      \"finding\": \"Transport of RAP-1 to the rhoptries is regulated by the secretory pathway. Brefeldin A (BFA) 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 initial 84-kDa primary translation product, distinct from the in vivo Pr86 precursor, indicating an additional protein modification during maturation.\",\n      \"method\": \"Brefeldin A treatment, low-temperature block, N-ethylmaleimide treatment, in vitro translation, metabolic labeling, immunoprecipitation\",\n      \"journal\": \"Molecular and biochemical parasitology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — multiple pharmacological and biochemical tools (BFA, low temperature, NEM) each independently supporting secretory pathway dependence, with in vitro translation providing direct mechanistic evidence; multiple orthogonal methods in a single rigorous study\",\n      \"pmids\": [\"8719244\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"RAP-1 precursor Pr86 is processed in the rhoptries by two sequential cleavage events: rapid cleavage to p82 followed by delayed cleavage to p67. Pr86, RAP-2 product p39, and RAP-3 product p37 form complexes prior to processing. Pr86 is present transiently in rhoptries and is absent from segmenting schizonts and extracellular merozoites, whereas p67 and p82 are the major RAP-1 forms in purified merozoites. Neither p67 nor p82 relocalize from rhoptries to the merozoite surface.\",\n      \"method\": \"Immunoblot with epitope-mapped antibodies, size fractionation with BFA-blocked radiolabeling, immunofluorescence localization, purified merozoite analysis\",\n      \"journal\": \"Molecular and biochemical parasitology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal epitope mapping, BFA-block size fractionation, immunofluorescence, and purified merozoite immunoblot all in one study; multiple orthogonal methods establishing processing sequence and localization\",\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 distinct low-molecular-weight rhoptry complexes (RAP1/RAP2 and RAP1/RAP3) that partition into detergent-resistant membranes (DRMs) of P. falciparum schizonts. RAP-1 predominates in high-molecular-weight species by blue native PAGE, suggesting aggregation into larger complexes than previously anticipated.\",\n      \"method\": \"Detergent-resistant membrane purification, blue native PAGE, mass spectrometry identification\",\n      \"journal\": \"Molecular and biochemical parasitology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — BN-PAGE combined with mass spectrometry identification in DRMs, single lab, establishes complex membership and unusual aggregation\",\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. This was demonstrated using RAP-1 gene-disruption mutant parasites in which the capacity to tag erythrocytes with surface iodination was lost, directly implicating RAP-1 in erythrocyte surface binding.\",\n      \"method\": \"RAP-1 gene-disruption mutant parasites, surface iodination experiments, antibody staining of normal erythrocytes\",\n      \"journal\": \"The Journal of infectious diseases\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic disruption with direct surface-labeling functional readout, single lab\",\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 intra-erythrocytic parasite growth. Conditional knockdown of RAP complex members leads to altered PVM structure, delayed intra-erythrocytic growth, and reduced parasitemia in infected mice.\",\n      \"method\": \"Conditional knockdown (reverse genetics), electron microscopy of PVM, parasite growth assays, mouse infection model\",\n      \"journal\": \"Cellular microbiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — conditional knockdown with multiple orthogonal readouts (PVM ultrastructure, in vitro growth, in vivo parasitemia), directly establishing post-invasion function\",\n      \"pmids\": [\"28205319\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}, {\"species\": \"Plasmodium berghei\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"In P. berghei, RAP-1 is required for targeting RAP-2 to the rhoptries. RAP1-deficient parasites showed increased early parasitemia but prolonged host survival, while RAP2/3-deficient parasites showed low parasitemia and host recovery, indicating RAP-1 and RAP-2/3 contribute to virulence.\",\n      \"method\": \"Generation of RAP1-deficient and RAP2/3-deficient P. berghei mutants by reverse genetics, mouse infection experiments, complementation of RAP2/3 expression\",\n      \"journal\": \"Experimental parasitology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic knockout with functional complementation in rodent malaria model; RAP-1's role in RAP-2 targeting is a direct mechanistic finding, single lab\",\n      \"pmids\": [\"29307564\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium berghei\", \"strain\": \"XAT\"}, {\"species\": \"Plasmodium berghei\", \"strain\": \"ANKA\"}]\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"RAP-1 was identified as part of an MSP-1-associated complex on the merozoite surface by anti-MSP-1 and anti-RhopH3 antibody pulldowns from merozoite lysates, with the complex detected at schizont/merozoite stages but not ring stages.\",\n      \"method\": \"Antibody pulldown from merozoite lysate, tandem mass spectrometry identification\",\n      \"journal\": \"Journal of proteome research\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single pulldown experiment with MS identification, no reciprocal confirmation for RAP-1 specifically, single lab\",\n      \"pmids\": [\"21175202\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    }\n  ],\n  \"current_model\": \"PF3D7_0604800 (RAP-1) is synthesized as a precursor (Pr86) in late schizonts, contains a cleavable N-terminal signal peptide, and is transported to the rhoptries via the secretory pathway (BFA- and NEM-sensitive); once in the rhoptries it undergoes sequential proteolytic cleavage (Pr86→p82→p67) and forms the core of two low-molecular-weight complexes with RAP-2 and RAP-3 respectively; RAP-1 is required for targeting RAP-2 to the rhoptries, can bind the surface of normal erythrocytes, and while dispensable for erythrocyte invasion, the RAP complex is required post-invasion for normal parasitophorous vacuolar membrane structure and efficient intra-erythrocytic parasite growth.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"PF3D7_0604800 (RAP-1) is a rhoptry protein that serves as the organizing core of low-molecular-weight rhoptry complexes required for post-invasion intra-erythrocytic development in Plasmodium falciparum [#4, #6]. It is synthesized as an 86-kDa precursor (Pr86) bearing a cleavable N-terminal signal peptide and is transported to the rhoptries through the secretory pathway, as its precursor-to-mature processing is reversibly blocked by brefeldin A and low temperature and irreversibly blocked by N-ethylmaleimide [#2]. Within the rhoptries Pr86 undergoes sequential proteolytic maturation, first rapidly to p82 and then more slowly to p67, with these mature forms — and not the surface — being the species retained in released merozoites [#0, #3]. RAP-1 nucleates two distinct complexes with RAP-2 and RAP-3 respectively, which partition into detergent-resistant membranes [#3, #4], and in P. berghei RAP-1 is required to target RAP-2 to the rhoptries [#7]. RAP-1 can bind the surface of normal erythrocytes [#5], yet the RAP complex is dispensable for rhoptry morphology and erythrocyte invasion; instead, conditional knockdown shows it is required after invasion for normal parasitophorous vacuolar membrane structure, efficient intra-erythrocytic growth, and virulence in mice [#6, #7].\",\n  \"teleology\": [\n    {\n      \"year\": 1990,\n      \"claim\": \"Establishing that the multiple RAP-1 antigen bands are one protein resolved the question of whether the immunodominant rhoptry species were distinct antigens or products of a single precursor.\",\n      \"evidence\": \"Immunoaffinity purification, SDS-PAGE, monoclonal antibody epitope analysis and autocatalytic processing assays in P. falciparum\",\n      \"pmids\": [\"2200961\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Protease responsible for processing not identified\", \"Functional role of the lipophilic/disulfide-bonded structure not defined\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 1992,\n      \"claim\": \"Mapping inhibitory antibody epitopes near the cleavage site and showing p65 is absent from merozoites tied RAP-1 processing to merozoite release rather than to invasion itself.\",\n      \"evidence\": \"Fusion-protein and synthetic-peptide epitope mapping with in vitro growth-inhibition assays and purified merozoite immunoblots in P. falciparum\",\n      \"pmids\": [\"1279419\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism by which epitope-directed antibodies inhibit growth not established\", \"Timing of cleavage relative to release not directly imaged\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 1995,\n      \"claim\": \"Pharmacological dissection showed RAP-1 reaches the rhoptries via the classical secretory pathway, placing its maturation within a defined trafficking route.\",\n      \"evidence\": \"Brefeldin A, low-temperature and N-ethylmaleimide blocks plus in vitro translation and metabolic labeling in P. falciparum\",\n      \"pmids\": [\"8719244\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Nature of the modification distinguishing the 84-kDa primary product from Pr86 not identified\", \"Rhoptry-targeting signal within RAP-1 not mapped\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 1998,\n      \"claim\": \"Resolving the ordered Pr86\\u2192p82\\u2192p67 cleavage and showing complex assembly precedes processing defined the biogenesis sequence of RAP-1 and its partners.\",\n      \"evidence\": \"Epitope-mapped immunoblotting, BFA-block size fractionation, immunofluorescence and purified merozoite analysis in P. falciparum\",\n      \"pmids\": [\"9574915\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Identity of the processing protease unknown\", \"Functional consequence of the delayed p82\\u2192p67 cleavage not defined\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Biochemical fractionation defined RAP-1 as the shared core of two membrane-associated complexes, refining its role from single antigen to a complex-organizing subunit.\",\n      \"evidence\": \"Detergent-resistant membrane purification, blue native PAGE and mass spectrometry in P. falciparum schizonts\",\n      \"pmids\": [\"17553576\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Stoichiometry and composition of the high-molecular-weight species not resolved\", \"Functional significance of DRM partitioning not tested\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Gene disruption showed RAP-1 mediates binding of the parasite to the surface of normal erythrocytes, assigning it a direct erythrocyte-interaction activity.\",\n      \"evidence\": \"RAP-1 gene-disruption mutants with surface iodination and antibody staining of normal erythrocytes in P. falciparum\",\n      \"pmids\": [\"17624849\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Erythrocyte receptor for RAP-1 not identified\", \"Physiological role of surface binding relative to invasion not defined\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Conditional knockdown reassigned the RAP complex from a presumed invasion factor to a post-invasion effector needed for PVM integrity and intra-erythrocytic growth.\",\n      \"evidence\": \"Conditional knockdown, PVM electron microscopy, growth assays and mouse infection in P. falciparum and P. berghei\",\n      \"pmids\": [\"28205319\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular mechanism linking RAP complex to PVM structure unknown\", \"RAP-1-specific contribution versus other complex members not isolated\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}, {\"species\": \"Plasmodium berghei\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Knockout and complementation in P. berghei established RAP-1 as required for rhoptry targeting of RAP-2 and as a contributor to virulence.\",\n      \"evidence\": \"RAP1- and RAP2/3-deficient P. berghei mutants with complementation and mouse infection\",\n      \"pmids\": [\"29307564\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism of RAP-2 targeting by RAP-1 not defined\", \"Basis of the differing parasitemia/survival phenotypes across mutants unresolved\"],\n      \"attribution\": [{\"species\": \"Plasmodium berghei\", \"strain\": \"XAT\"}, {\"species\": \"Plasmodium berghei\", \"strain\": \"ANKA\"}]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The molecular activity by which RAP-1 and its complex shape the parasitophorous vacuolar membrane, and the identity of its processing protease and erythrocyte receptor, remain unknown.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No enzymatic or structural mechanism for the RAP complex's post-invasion function\", \"Processing protease unidentified\", \"Erythrocyte surface receptor unidentified\"],\n      \"attribution\": []\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0005102\", \"supporting_discovery_ids\": [5]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0020008\", \"supporting_discovery_ids\": [2, 3]},\n      {\"term_id\": \"GO:0045335\", \"supporting_discovery_ids\": [8]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"GO:0006886\", \"supporting_discovery_ids\": [2]}\n    ],\n    \"complexes\": [\n      \"RAP-1/RAP-2 rhoptry complex\",\n      \"RAP-1/RAP-3 rhoptry complex\",\n      \"MSP-1-associated merozoite surface complex (Low-confidence)\"\n    ],\n    \"partners\": [\n      \"RAP-2\",\n      \"RAP-3\",\n      \"MSP-1 (Low-confidence)\",\n      \"RhopH3 (Low-confidence)\"\n    ],\n    \"other_free_text\": [\n      \"Synthesized as an 86-kDa precursor (Pr86) with a cleavable N-terminal signal peptide; sequentially processed to p82 then p67 within the rhoptries [#0, #2, #3].\",\n      \"Lipophilic antigen whose structure depends on disulfide bonding [#0].\",\n      \"Partitions into detergent-resistant membranes of schizonts [#4].\",\n      \"In P. berghei, required for targeting RAP-2 to the rhoptries [#7].\",\n      \"RAP complex is dispensable for erythrocyte invasion but required post-invasion for normal PVM structure and intra-erythrocytic growth [#6].\"\n    ]\n  }\n}","audit_flag":{"gene":"PF3D7_0604800","tier":"IDENTITY_CHECK","verdict":"identity unverified","subtype":"names_other_cards","uniprot_band":"","rules_fired":"R12","issue":"No cited paper names this card; 8 of 9 cited papers name other catalogue genes (PF3D7_1410400, PF3D7_0930300, PF3D7_0501500). The summary may describe one of those genes."},"strains":[{"strain":"Pf3D7","gene_id":"PF3D7_0604800","name":null,"product":"RAP protein, putative","uniprot_acc":null,"chromosome":null,"start_pos":null},{"strain":"PbANKA","gene_id":"PBANKA_0103500","name":null,"product":"RAP protein, putative","uniprot_acc":null,"chromosome":null,"start_pos":null},{"strain":"PkH","gene_id":"PKNH_1145700","name":null,"product":"RAP protein, putative","uniprot_acc":null,"chromosome":null,"start_pos":null}],"gene_symbol":"","evaluation":null}