{"gene":"PF3D7_0105200","run_date":"2026-09-07T10:55:51","timeline":{"discoveries":[{"year":2022,"finding":"PF3D7_0105200 (referred to as PfRAP01 in the paper) localizes to the mitochondrion in P. falciparum, is essential for parasite survival, functions as an RNA-binding protein that interacts specifically with mitochondrial rRNAs, and is involved in mitochondrial RNA metabolism and mitoribosome activity, as demonstrated by inducible knockdown, eCLIP-seq, transcriptomics, metabolomics, and proteomics.","method":"Inducible knockdown (TetR-DOZI), eCLIP-seq (high-throughput sequencing of RNA isolated by crosslinking immunoprecipitation), transcriptomics, metabolomics, proteomics, mitochondrial enrichment experiments","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1-2 / Strong — multiple orthogonal methods (eCLIP-seq, knockdown with survival readout, transcriptomics, proteomics, metabolomics) in a single rigorous study establishing RNA-binding activity and mitochondrial localization with functional consequence","pmids":["35277503"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2000,"finding":"RAP1 is required for targeting RAP2 to the rhoptries in P. falciparum; truncated RAP1 species (produced by gene disruption) failed to complex with RAP2 and RAP3, and RAP2 was mislocalized to a compartment resembling the endoplasmic reticulum lumen rather than the rhoptries. Disruption of RAP1 did not abolish erythrocyte invasion.","method":"Gene targeting/disruption, immunoprecipitation, immunofluorescence localization","journal":"The EMBO journal","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal immunoprecipitation combined with genetic disruption and localization, single lab but multiple orthogonal methods with clear mechanistic readout","pmids":["10835342"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2009,"finding":"RAP1 is trafficked to the rhoptry via an interaction with the GPI-anchored rhoptry protein RAMA; once inside the rhoptry, RAP1 contains distinct signals for localization within a sub-compartment and for subsequent transfer to the parasitophorous vacuole after invasion.","method":"GFP chimera trafficking assays, in vitro pull-down assays","journal":"PLoS pathogens","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — GFP chimera trafficking combined with in vitro pull-down, single lab, two orthogonal methods","pmids":["19266084"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":1995,"finding":"Transport of RAP1 (p82) to the rhoptries in P. falciparum is regulated by the secretory pathway; brefeldin A and low temperature reversibly block processing of the 86-kDa precursor (Pr86) to the mature 82-kDa product, and N-ethylmaleimide irreversibly blocks this processing. In vitro translation revealed a cleavable N-terminal signal peptide and an initial 84-kDa primary product that differs from the in vivo precursor Pr86, suggesting a post-translational modification during maturation.","method":"Brefeldin A and low temperature treatment of intact cells, N-ethylmaleimide treatment, in vitro translation, immunoprecipitation","journal":"Molecular and biochemical parasitology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — pharmacological pathway dissection with multiple inhibitors and in vitro translation, single lab","pmids":["8719244"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":1998,"finding":"RAP1 undergoes sequential proteolytic processing within the rhoptries: the precursor Pr86 is rapidly cleaved to p82 and then more slowly to p67, both reactions occurring after Pr86 complexes are transported to forming rhoptries. p67 is absent from ring-stage parasites, suggesting it plays a role specifically during merozoite invasion. Pr86 can form complexes with RAP-2 (p39) and RAP-3 (p37) similar to mature p82/p67 complexes.","method":"Immunoblot, immunofluorescence localization, brefeldin A treatment (size fractionation of radiolabeled proteins), antibody epitope mapping","journal":"Molecular and biochemical parasitology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple antibodies and biochemical fractionation combined with localization, single lab","pmids":["9574915"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":1990,"finding":"RAP1 (rhoptry-associated protein-1) is a multi-component antigen whose 80, 65, 42, and 40 kDa proteins are derived from the same precursor via autocatalytic processing, as indicated by monoclonal antibody evidence and immunological cross-reactivity; the antigen is lipophilic and disulfide bonding plays an important role in its structure.","method":"Immunoaffinity purification, SDS-PAGE, monoclonal antibody characterization, Western blot, gene sequencing","journal":"Molecular and biochemical parasitology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — biochemical purification with multiple antibody probes and partial sequencing, single lab","pmids":["2200961"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2011,"finding":"RAP1 is a substrate of the P. falciparum subtilisin-like protease PfSUB1; bioinformatic and proteomic analysis of the late asexual blood stage proteome identified RAP1 as proteolytically processed by PfSUB1.","method":"Bioinformatic analysis combined with proteomic analysis of asexual blood stage proteome","journal":"Infection and immunity","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — proteomic identification in a systematic substrate screen, single lab, replicated by bioinformatics","pmids":["21220481"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":1992,"finding":"Inhibitory monoclonal antibodies against RAP1 recognize linear epitopes mapping 10-20 amino acids C-terminal to the proteolytic cleavage site (around amino acid 190) where p80 is processed to p65; the p65 form is absent from purified merozoites, suggesting its generation is associated with merozoite release.","method":"Monoclonal antibody epitope mapping with beta-galactosidase fusion proteins and synthetic peptides, Western blot, in vitro parasite growth inhibition assay","journal":"Molecular and biochemical parasitology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — epitope mapping combined with functional inhibition assay, single lab, two orthogonal methods","pmids":["1279419"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2017,"finding":"The RAP complex (including RAP1) in Plasmodium is not required for rhoptry morphology or erythrocyte invasion, but instead functions post-invasion to facilitate parasite survival in the parasitophorous vacuole; conditional knockdown of RAP complex members leads to altered parasitophorous vacuolar membrane (PVM) structure, delayed intra-erythrocytic growth, and reduced parasitaemias in infected mice.","method":"Conditional knockdown, fluorescence microscopy of PVM structure, in vitro growth assays, in vivo mouse infection","journal":"Cellular microbiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — conditional knockdown with multiple phenotypic readouts (PVM morphology, growth, in vivo parasitemia), single lab","pmids":["28205319"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""},{"species":"Plasmodium berghei","strain":""}]},{"year":2007,"finding":"RAP1 is a core component of both the RAP1/RAP2 and RAP1/RAP3 low molecular weight rhoptry complexes; RAP1 was identified as predominating in high molecular weight species by BN-PAGE from detergent-resistant membranes, suggesting aggregation into larger complexes.","method":"Detergent-resistant membrane purification, blue native-PAGE, mass spectrometry","journal":"Molecular and biochemical parasitology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — BN-PAGE combined with mass spectrometry identification, single lab","pmids":["17553576"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2007,"finding":"RAP1 (but not RAP3) is required for the binding of RAP complex members to the surface of normal (non-parasitized) erythrocytes; RAP1 gene-disruption mutant parasites lost their capacity to tag erythrocytes as measured by surface iodination experiments.","method":"RAP1 gene-disruption mutant parasites, surface iodination experiments","journal":"The Journal of infectious diseases","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic disruption with biochemical surface-binding readout, single lab","pmids":["17624849"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2003,"finding":"RAP1 is found in close apposition with RAMA in the Golgi/rhoptry trafficking pathway, suggesting direct protein-protein interactions; RAMA disruption experiments implicated RAMA in trafficking RAP1 and RhopH3 to rhoptries.","method":"Immunofluorescence co-localization, brefeldin A treatment, immunoprecipitation (indirect)","journal":"The Journal of biological chemistry","confidence":"Low","confidence_rationale":"Tier 3 / Weak — co-localization only, no direct pull-down of RAP1-RAMA interaction shown in this paper","pmids":["14613941"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2015,"finding":"PfAlba1 RNA-binding protein binds the RAP1 mRNA in trophozoites and this binding is linked to translational repression of RAP1; release of RAP1 mRNA from the PfAlba1 complex in mature stages correlates with RAP1 protein synthesis.","method":"Deep sequencing of affinity-purified PfAlba1-associated RNAs (RIP-seq), overexpression of epitope-tagged PfAlba1, mRNA steady-state analysis","journal":"Genome biology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — RIP-seq combined with translational timing analysis, single lab, two orthogonal methods","pmids":["26415947"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2015,"finding":"The AP-1 adaptor complex subunit Pfmu1 co-localizes with RAP1 in schizonts and co-immunoprecipitates with RAP1, suggesting a role for the AP-1 complex in RAP1 trafficking to rhoptries.","method":"Co-immunoprecipitation, immunofluorescence co-localization, AlF4 treatment","journal":"Biochimica et biophysica acta","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single Co-IP and co-localization, single lab, no direct mutagenesis of trafficking signal","pmids":["25573429"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2004,"finding":"Synthetic peptides spanning RAP1 sequence (HABPs 26201-26204 in the Cys region residues 461-540, and HABP 26188 residues 201-220) bind specifically to erythrocytes in a saturable manner, some inhibit in vitro merozoite invasion, and they bind specifically to a 72 kDa protein in the red blood cell membrane.","method":"Erythrocyte binding assays with synthetic peptides, in vitro invasion inhibition assays, ligand-binding to RBC membrane proteins","journal":"Vaccine","confidence":"Low","confidence_rationale":"Tier 3 / Weak — peptide binding assay, single lab, no validation with full-length protein or mutagenesis","pmids":["15161083"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2019,"finding":"RAP1 protein localizes to rhoptries in P. berghei sporozoites (confirmed by immuno-electron microscopy), indicating that rhoptry expression and localization of RAP1 is conserved between merozoites and sporozoites.","method":"Immuno-electron microscopy, RT-PCR for transcript detection in oocyst-derived sporozoites","journal":"Frontiers in cellular and infection microbiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — immuno-electron microscopy provides direct localization evidence in sporozoites, single lab","pmids":["31552198"],"is_preprint":false,"attribution":[{"species":"Plasmodium berghei","strain":""}]},{"year":2018,"finding":"In P. berghei, RAP1 deficiency leads to increased early parasitemia but prolonged mouse survival compared to controls; RAP1 is required for targeting RAP2 to the rhoptries (consistent with P. falciparum data), and deletion of RAP1 was associated with attenuated virulence.","method":"Genetic disruption (knockout) in P. berghei ANKA, in vivo mouse infection, comparative genomics","journal":"Experimental parasitology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic knockout with in vivo phenotypic readout, single lab","pmids":["29307564"],"is_preprint":false,"attribution":[{"species":"Plasmodium berghei","strain":"ANKA"}]},{"year":2021,"finding":"RAP1 and RAP2 were identified as components of the low-molecular-mass rhoptry protein complex by immunoaffinity purification and LC-MS/MS from P. falciparum merozoites.","method":"Immunoaffinity purification, LC-MS/MS","journal":"Frontiers in cellular and infection microbiology","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single immunoprecipitation-MS experiment confirming known complex membership, single lab","pmids":["33537242"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2020,"finding":"RAP1, RAP2, and RAP3 were identified as associated proteins of PfClag9 by immunoprecipitation and mass spectrometry from P. falciparum merozoite extracts, placing RAP1 within the broader PfClag9-RhopH complex.","method":"Immunoprecipitation with anti-PfClag9 antibody, mass spectrometry","journal":"Infection and immunity","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single Co-IP/MS experiment identifying RAP1 as associated protein, no direct functional follow-up for RAP1 specifically","pmids":["31712270"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]}],"current_model":"PF3D7_0105200 (RAP1) is a rhoptry protein of Plasmodium falciparum that functions dually: in blood-stage merozoites it acts as an essential chaperone for RAP2 rhoptry targeting (requiring the secretory/Golgi pathway and interaction with RAMA), forms the low-molecular-weight RAP1/RAP2/RAP3 rhoptry complex, undergoes sequential proteolytic processing (Pr86→p82→p67 by PfSUB1 among others) within the rhoptry, and—post-invasion—contributes to parasitophorous vacuole membrane integrity and intra-erythrocytic parasite survival; additionally, a separate family member sharing the same gene ID has been shown to localize to the mitochondrion in trophozoites, where it functions as an RNA-binding protein (confirmed by eCLIP-seq) that interacts with mitochondrial rRNAs and is essential for mitoribosome activity and parasite survival."},"narrative":{"mechanistic_narrative":"PF3D7_0105200 (RAP1) is a Plasmodium falciparum rhoptry-associated protein that organizes the low-molecular-weight rhoptry complex and, after invasion, supports intra-erythrocytic parasite survival [PMID:10835342, PMID:28205319, PMID:17553576]. RAP1 is synthesized as an 86-kDa precursor (Pr86) that traffics through the secretory/Golgi pathway—blocked reversibly by brefeldin A and low temperature and irreversibly by N-ethylmaleimide—en route to the rhoptry [PMID:8719244], where it is proteolytically matured through sequential cleavage to p82 and then p67 [PMID:9574915], a maturation that includes cleavage by the subtilisin-like protease PfSUB1 [PMID:21220481]. Trafficking to the rhoptry depends on association with the GPI-anchored protein RAMA, with RAP1 carrying distinct signals for sub-compartment localization and for subsequent transfer to the parasitophorous vacuole [PMID:19266084, PMID:14613941]. Within the rhoptry RAP1 is the core component of the RAP1/RAP2 and RAP1/RAP3 complexes [PMID:17553576] and is required to escort RAP2 to the rhoptry: disruption of RAP1 mislocalizes RAP2 to an ER-like compartment without abolishing erythrocyte invasion [PMID:10835342]. Functionally, the RAP complex is dispensable for rhoptry morphology and invasion but acts post-invasion to maintain parasitophorous vacuolar membrane integrity and normal intra-erythrocytic growth [PMID:28205319]; consistent with this, in P. berghei RAP1 deletion attenuates virulence while retaining its RAP2-targeting role [PMID:29307564]. Separately, the same gene ID was reported to encode a mitochondrion-localized, essential RNA-binding protein (termed PfRAP01) that binds mitochondrial rRNAs and supports mitoribosome activity in trophozoites [PMID:35277503]; this mitochondrial identity is not reconciled with the rhoptry-protein body of evidence in the available corpus.","teleology":[{"year":1990,"claim":"The question of whether RAP1's multiple immunodetected forms arise from one gene product was addressed by showing they derive from a common precursor, establishing RAP1 as a processed multi-component antigen.","evidence":"immunoaffinity purification, SDS-PAGE, monoclonal antibodies and partial gene sequencing in P. falciparum","pmids":["2200961"],"confidence":"Medium","gaps":["Protease responsible not identified","Functional role of any processed form undefined"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":1992,"claim":"To connect RAP1 processing to parasite biology, inhibitory antibodies were mapped near the p80-to-p65 cleavage site, linking a specific processing event to merozoite release.","evidence":"monoclonal antibody epitope mapping with fusion proteins/synthetic peptides and in vitro growth inhibition in P. falciparum","pmids":["1279419"],"confidence":"Medium","gaps":["Mechanism of invasion inhibition not defined","Erythrocyte ligand not identified"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":1995,"claim":"The route of RAP1 to the rhoptry was defined as secretory-pathway dependent, showing precursor processing requires transit through the Golgi.","evidence":"brefeldin A / low-temperature / NEM treatment plus in vitro translation and immunoprecipitation in P. falciparum","pmids":["8719244"],"confidence":"Medium","gaps":["Nature of the post-translational modification distinguishing the 84-kDa primary product from Pr86 unresolved","Specific transport receptors not identified"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":1998,"claim":"The temporal order of RAP1 maturation was resolved, showing Pr86 is cleaved to p82 then slowly to p67 only after complex formation and delivery to forming rhoptries, implying p67 acts during invasion.","evidence":"immunoblot, immunofluorescence, brefeldin A fractionation and epitope mapping in P. falciparum","pmids":["9574915"],"confidence":"Medium","gaps":["Protease(s) executing each cleavage not identified at the time","Functional consequence of p67 generation not tested"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2000,"claim":"Whether RAP1 has a role beyond being a processed antigen was answered by showing it is required to target RAP2 to the rhoptry, defining RAP1 as a chaperone/escort for the complex.","evidence":"gene disruption, immunoprecipitation and immunofluorescence in P. falciparum","pmids":["10835342"],"confidence":"High","gaps":["Molecular determinants on RAP1 mediating RAP2 escort not mapped","Why invasion is unaffected despite mislocalization not explained"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2003,"claim":"The upstream trafficking partner was probed by placing RAP1 in apposition to RAMA in the Golgi/rhoptry pathway, implicating RAMA in RAP1 delivery.","evidence":"immunofluorescence co-localization, brefeldin A treatment and indirect immunoprecipitation in P. falciparum","pmids":["14613941"],"confidence":"Low","gaps":["No direct RAP1-RAMA pull-down demonstrated in this study","Binding interface undefined"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2004,"claim":"The possibility of a direct erythrocyte-binding role was explored using RAP1-derived peptides that bind red cells and a 72-kDa membrane protein and inhibit invasion.","evidence":"synthetic peptide erythrocyte-binding and invasion inhibition assays in P. falciparum","pmids":["15161083"],"confidence":"Low","gaps":["Not validated with full-length RAP1 or mutagenesis","Identity of the 72-kDa receptor unknown"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2007,"claim":"The complex architecture and a surface-tagging activity were defined: RAP1 is the core of RAP1/RAP2 and RAP1/RAP3 complexes and is specifically required for RAP-complex binding to erythrocyte surfaces.","evidence":"BN-PAGE and mass spectrometry of detergent-resistant membranes [#9]; RAP1 gene-disruption and surface iodination [#10] in P. falciparum","pmids":["17553576","17624849"],"confidence":"Medium","gaps":["Biological significance of erythrocyte tagging not established","Composition of higher-order aggregates unresolved"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2009,"claim":"The trafficking mechanism was refined by showing RAMA interaction routes RAP1 into the rhoptry and that RAP1 encodes separable signals for sub-compartment localization and post-invasion transfer to the parasitophorous vacuole.","evidence":"GFP chimera trafficking assays and in vitro pull-down in P. falciparum","pmids":["19266084"],"confidence":"Medium","gaps":["Precise signal sequences not mapped to residues","Machinery executing PV transfer unknown"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2011,"claim":"A specific protease for RAP1 maturation was assigned by identifying RAP1 as a PfSUB1 substrate in the late blood-stage proteome.","evidence":"bioinformatic and proteomic substrate analysis in P. falciparum","pmids":["21220481"],"confidence":"Medium","gaps":["Cleavage sites not directly mapped for RAP1","Whether PfSUB1 alone accounts for all processing steps unclear"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2015,"claim":"Regulation of RAP1 expression and additional trafficking partners were addressed: PfAlba1 binds RAP1 mRNA to time its translation [#12], and the AP-1 subunit Pfmu1 co-precipitates with RAP1 [#13].","evidence":"RIP-seq and translational timing analysis [#12]; co-immunoprecipitation and co-localization [#13] in P. falciparum","pmids":["26415947","25573429"],"confidence":"Medium","gaps":["Pfmu1-RAP1 interaction rests on a single Co-IP without trafficking-signal mutagenesis","How translational timing coordinates with rhoptry biogenesis not resolved"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2017,"claim":"The long-standing question of RAP1's essential function was reframed by showing the RAP complex is dispensable for invasion but required post-invasion for PVM integrity and intra-erythrocytic growth.","evidence":"conditional knockdown, PVM microscopy, growth assays and mouse infection in P. falciparum and P. berghei","pmids":["28205319"],"confidence":"Medium","gaps":["Molecular mechanism by which the RAP complex maintains the PVM unknown","Whether RAP1 acts directly at the PVM not shown"],"attribution":[{"species":"Plasmodium falciparum","strain":""},{"species":"Plasmodium berghei","strain":""}]},{"year":2018,"claim":"Cross-species conservation of RAP1 function and its contribution to virulence were tested in P. berghei, confirming RAP2 targeting and revealing attenuated virulence upon RAP1 loss.","evidence":"gene knockout and in vivo mouse infection in P. berghei ANKA","pmids":["29307564"],"confidence":"Medium","gaps":["Mechanistic basis of increased early parasitemia yet prolonged survival unresolved","Link between RAP2 mistargeting and virulence not established"],"attribution":[{"species":"Plasmodium berghei","strain":"ANKA"}]},{"year":2019,"claim":"Whether rhoptry localization extends beyond merozoites was answered by demonstrating RAP1 rhoptry localization in P. berghei sporozoites.","evidence":"immuno-electron microscopy and RT-PCR in P. berghei sporozoites","pmids":["31552198"],"confidence":"Medium","gaps":["Sporozoite-stage function of RAP1 not tested","Whether the RAP complex assembles in sporozoites unknown"],"attribution":[{"species":"Plasmodium berghei","strain":""}]},{"year":2022,"claim":"A distinct identity was reported under the same gene ID: an essential mitochondrial RNA-binding protein (PfRAP01) binding mitochondrial rRNAs and supporting mitoribosome activity in trophozoites.","evidence":"inducible knockdown, eCLIP-seq, transcriptomics, metabolomics, proteomics and mitochondrial enrichment in P. falciparum","pmids":["35277503"],"confidence":"High","gaps":["Not reconciled with the rhoptry-protein literature for this gene ID","Relationship, if any, between mitochondrial and rhoptry pools undefined"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":null,"claim":"It remains unresolved how the rhoptry-associated RAP1 body of evidence and the reported mitochondrial RNA-binding activity assigned to the same gene ID relate, and what the direct molecular mechanism of RAP1 in PVM maintenance is.","evidence":"","pmids":[],"confidence":"Low","gaps":["Two divergent localizations/functions attributed to one gene ID not experimentally reconciled","No structural model of RAP1 or its complexes","Direct RAP1 activity at the PVM undemonstrated"],"attribution":[]}],"mechanism_profile":{"molecular_activity":[],"localization":[],"pathway":[],"complexes":["RAP1/RAP2 low-molecular-weight rhoptry complex [#9, #17]","RAP1/RAP3 low-molecular-weight rhoptry complex [#9]","RAP1/RAP2/RAP3 within the broader PfClag9-RhopH association [#18]"],"partners":["RAP2 (ESCORTED TO RHOPTRY BY RAP1) [#1, #16]","RAP3 [#9]","RAMA (GPI-ANCHORED TRAFFICKING PARTNER) [#2, #11]","PFSUB1 (PROTEASE ACTING ON RAP1) [#6]","PFALBA1 (BINDS RAP1 MRNA, TRANSLATIONAL REPRESSION) [#12]","PFMU1 / AP-1 ADAPTOR COMPLEX [#13]","PFCLAG9 [#18]","MITOCHONDRIAL RRNAS [#0]"],"other_free_text":["Synthesized as an 86-kDa precursor (Pr86) sequentially processed to p82 then p67 within the rhoptry [#3, #4].","Processing near residue ~190 (p80-to-p65) is associated with merozoite release and mapped by inhibitory monoclonal antibodies [#7].","RAP1 is specifically required for RAP-complex binding to the surface of non-parasitized erythrocytes [#10].","RAP1-derived peptides bind erythrocytes and a 72-kDa RBC membrane protein and inhibit invasion (Low confidence) [#14].","A mitochondrial RNA-binding identity (PfRAP01) reported for the same gene ID is not reconciled with the rhoptry-protein evidence in this corpus [#0]."]}},"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","RAP1"],"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","RAP1"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"14613941","id":"PMC_14613941","title":"Characterization of a membrane-associated rhoptry protein of Plasmodium falciparum.","date":"2003","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/14613941","citation_count":106,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["RAP1"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"10835342","id":"PMC_10835342","title":"RAP1 controls rhoptry targeting of RAP2 in the malaria parasite Plasmodium falciparum.","date":"2000","source":"The EMBO journal","url":"https://pubmed.ncbi.nlm.nih.gov/10835342","citation_count":104,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["RAP1"],"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","RAP1"],"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","RAP1"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"21220481","id":"PMC_21220481","title":"Global identification of multiple substrates for Plasmodium falciparum SUB1, an essential malarial processing protease.","date":"2011","source":"Infection and 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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","RAP1"],"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","RAP1","PfRAP1","PkRAP1","PvRAP1"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"35214662","id":"PMC_35214662","title":"Protection and Alleviated Inflammation Induced by Virus-like Particle Vaccines Containing Plasmodium berghei MSP-8, MSP-9 and RAP1.","date":"2022","source":"Vaccines","url":"https://pubmed.ncbi.nlm.nih.gov/35214662","citation_count":2,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["RAP1"],"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","RAP1"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"38922654","id":"PMC_38922654","title":"Detection of Plasmodium knowlesi in whole blood samples with sandwich enzyme-linked immunosorbent assay (ELISA) using rhoptry-associated protein 1 specific polyclonal antibodies.","date":"2024","source":"Journal of vector borne diseases","url":"https://pubmed.ncbi.nlm.nih.gov/38922654","citation_count":0,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["PkRAP1"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":35679,"output_tokens":4933,"usd":0.090516,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":11551,"output_tokens":5674,"usd":0.099803,"stage2_stop_reason":"end_turn"},"total_usd":0.190319,"stage1_batch_id":"msgbatch_01DbiymDmubkPpYvdbAu5a7V","stage2_batch_id":"msgbatch_012TbrWvMRH129T7PQ4SmvrJ","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2022,\n      \"finding\": \"PF3D7_0105200 (referred to as PfRAP01 in the paper) localizes to the mitochondrion in P. falciparum, is essential for parasite survival, functions as an RNA-binding protein that interacts specifically with mitochondrial rRNAs, and is involved in mitochondrial RNA metabolism and mitoribosome activity, as demonstrated by inducible knockdown, eCLIP-seq, transcriptomics, metabolomics, and proteomics.\",\n      \"method\": \"Inducible knockdown (TetR-DOZI), eCLIP-seq (high-throughput sequencing of RNA isolated by crosslinking immunoprecipitation), transcriptomics, metabolomics, proteomics, mitochondrial enrichment experiments\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 / Strong — multiple orthogonal methods (eCLIP-seq, knockdown with survival readout, transcriptomics, proteomics, metabolomics) in a single rigorous study establishing RNA-binding activity and mitochondrial localization with functional consequence\",\n      \"pmids\": [\"35277503\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"RAP1 is required for targeting RAP2 to the rhoptries in P. falciparum; truncated RAP1 species (produced by gene disruption) failed to complex with RAP2 and RAP3, and RAP2 was mislocalized to a compartment resembling the endoplasmic reticulum lumen rather than the rhoptries. Disruption of RAP1 did not abolish erythrocyte invasion.\",\n      \"method\": \"Gene targeting/disruption, immunoprecipitation, immunofluorescence localization\",\n      \"journal\": \"The EMBO journal\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal immunoprecipitation combined with genetic disruption and localization, single lab but multiple orthogonal methods with clear mechanistic readout\",\n      \"pmids\": [\"10835342\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"RAP1 is trafficked to the rhoptry via an interaction with the GPI-anchored rhoptry protein RAMA; once inside the rhoptry, RAP1 contains distinct signals for localization within a sub-compartment and for subsequent transfer to the parasitophorous vacuole after invasion.\",\n      \"method\": \"GFP chimera trafficking assays, in vitro pull-down assays\",\n      \"journal\": \"PLoS pathogens\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — GFP chimera trafficking combined with in vitro pull-down, single lab, two orthogonal methods\",\n      \"pmids\": [\"19266084\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 1995,\n      \"finding\": \"Transport of RAP1 (p82) to the rhoptries in P. falciparum is regulated by the secretory pathway; brefeldin A and low temperature reversibly block processing of the 86-kDa precursor (Pr86) to the mature 82-kDa product, and N-ethylmaleimide irreversibly blocks this processing. In vitro translation revealed a cleavable N-terminal signal peptide and an initial 84-kDa primary product that differs from the in vivo precursor Pr86, suggesting a post-translational modification during maturation.\",\n      \"method\": \"Brefeldin A and low temperature treatment of intact cells, N-ethylmaleimide treatment, in vitro translation, immunoprecipitation\",\n      \"journal\": \"Molecular and biochemical parasitology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — pharmacological pathway dissection with multiple inhibitors and in vitro translation, single lab\",\n      \"pmids\": [\"8719244\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"RAP1 undergoes sequential proteolytic processing within the rhoptries: the precursor Pr86 is rapidly cleaved to p82 and then more slowly to p67, both reactions occurring after Pr86 complexes are transported to forming rhoptries. p67 is absent from ring-stage parasites, suggesting it plays a role specifically during merozoite invasion. Pr86 can form complexes with RAP-2 (p39) and RAP-3 (p37) similar to mature p82/p67 complexes.\",\n      \"method\": \"Immunoblot, immunofluorescence localization, brefeldin A treatment (size fractionation of radiolabeled proteins), antibody epitope mapping\",\n      \"journal\": \"Molecular and biochemical parasitology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple antibodies and biochemical fractionation combined with localization, single lab\",\n      \"pmids\": [\"9574915\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 1990,\n      \"finding\": \"RAP1 (rhoptry-associated protein-1) is a multi-component antigen whose 80, 65, 42, and 40 kDa proteins are derived from the same precursor via autocatalytic processing, as indicated by monoclonal antibody evidence and immunological cross-reactivity; the antigen is lipophilic and disulfide bonding plays an important role in its structure.\",\n      \"method\": \"Immunoaffinity purification, SDS-PAGE, monoclonal antibody characterization, Western blot, gene sequencing\",\n      \"journal\": \"Molecular and biochemical parasitology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — biochemical purification with multiple antibody probes and partial sequencing, single lab\",\n      \"pmids\": [\"2200961\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"RAP1 is a substrate of the P. falciparum subtilisin-like protease PfSUB1; bioinformatic and proteomic analysis of the late asexual blood stage proteome identified RAP1 as proteolytically processed by PfSUB1.\",\n      \"method\": \"Bioinformatic analysis combined with proteomic analysis of asexual blood stage proteome\",\n      \"journal\": \"Infection and immunity\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — proteomic identification in a systematic substrate screen, single lab, replicated by bioinformatics\",\n      \"pmids\": [\"21220481\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 1992,\n      \"finding\": \"Inhibitory monoclonal antibodies against RAP1 recognize linear epitopes mapping 10-20 amino acids C-terminal to the proteolytic cleavage site (around amino acid 190) where p80 is processed to p65; the p65 form is absent from purified merozoites, suggesting its generation is associated with merozoite release.\",\n      \"method\": \"Monoclonal antibody epitope mapping with beta-galactosidase fusion proteins and synthetic peptides, Western blot, in vitro parasite growth inhibition assay\",\n      \"journal\": \"Molecular and biochemical parasitology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — epitope mapping combined with functional inhibition assay, single lab, two orthogonal methods\",\n      \"pmids\": [\"1279419\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"The RAP complex (including RAP1) in Plasmodium is not required for rhoptry morphology or erythrocyte invasion, but instead functions post-invasion to facilitate parasite survival in the parasitophorous vacuole; conditional knockdown of RAP complex members leads to altered parasitophorous vacuolar membrane (PVM) structure, delayed intra-erythrocytic growth, and reduced parasitaemias in infected mice.\",\n      \"method\": \"Conditional knockdown, fluorescence microscopy of PVM structure, in vitro growth assays, in vivo mouse infection\",\n      \"journal\": \"Cellular microbiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — conditional knockdown with multiple phenotypic readouts (PVM morphology, growth, in vivo parasitemia), single lab\",\n      \"pmids\": [\"28205319\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}, {\"species\": \"Plasmodium berghei\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"RAP1 is a core component of both the RAP1/RAP2 and RAP1/RAP3 low molecular weight rhoptry complexes; RAP1 was identified as predominating in high molecular weight species by BN-PAGE from detergent-resistant membranes, suggesting aggregation into larger complexes.\",\n      \"method\": \"Detergent-resistant membrane purification, blue native-PAGE, mass spectrometry\",\n      \"journal\": \"Molecular and biochemical parasitology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — BN-PAGE combined with mass spectrometry identification, single lab\",\n      \"pmids\": [\"17553576\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"RAP1 (but not RAP3) is required for the binding of RAP complex members to the surface of normal (non-parasitized) erythrocytes; RAP1 gene-disruption mutant parasites lost their capacity to tag erythrocytes as measured by surface iodination experiments.\",\n      \"method\": \"RAP1 gene-disruption mutant parasites, surface iodination experiments\",\n      \"journal\": \"The Journal of infectious diseases\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic disruption with biochemical surface-binding readout, single lab\",\n      \"pmids\": [\"17624849\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"RAP1 is found in close apposition with RAMA in the Golgi/rhoptry trafficking pathway, suggesting direct protein-protein interactions; RAMA disruption experiments implicated RAMA in trafficking RAP1 and RhopH3 to rhoptries.\",\n      \"method\": \"Immunofluorescence co-localization, brefeldin A treatment, immunoprecipitation (indirect)\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — co-localization only, no direct pull-down of RAP1-RAMA interaction shown in this paper\",\n      \"pmids\": [\"14613941\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"PfAlba1 RNA-binding protein binds the RAP1 mRNA in trophozoites and this binding is linked to translational repression of RAP1; release of RAP1 mRNA from the PfAlba1 complex in mature stages correlates with RAP1 protein synthesis.\",\n      \"method\": \"Deep sequencing of affinity-purified PfAlba1-associated RNAs (RIP-seq), overexpression of epitope-tagged PfAlba1, mRNA steady-state analysis\",\n      \"journal\": \"Genome biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — RIP-seq combined with translational timing analysis, single lab, two orthogonal methods\",\n      \"pmids\": [\"26415947\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"The AP-1 adaptor complex subunit Pfmu1 co-localizes with RAP1 in schizonts and co-immunoprecipitates with RAP1, suggesting a role for the AP-1 complex in RAP1 trafficking to rhoptries.\",\n      \"method\": \"Co-immunoprecipitation, immunofluorescence co-localization, AlF4 treatment\",\n      \"journal\": \"Biochimica et biophysica acta\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single Co-IP and co-localization, single lab, no direct mutagenesis of trafficking signal\",\n      \"pmids\": [\"25573429\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"Synthetic peptides spanning RAP1 sequence (HABPs 26201-26204 in the Cys region residues 461-540, and HABP 26188 residues 201-220) bind specifically to erythrocytes in a saturable manner, some inhibit in vitro merozoite invasion, and they bind specifically to a 72 kDa protein in the red blood cell membrane.\",\n      \"method\": \"Erythrocyte binding assays with synthetic peptides, in vitro invasion inhibition assays, ligand-binding to RBC membrane proteins\",\n      \"journal\": \"Vaccine\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — peptide binding assay, single lab, no validation with full-length protein or mutagenesis\",\n      \"pmids\": [\"15161083\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"RAP1 protein localizes to rhoptries in P. berghei sporozoites (confirmed by immuno-electron microscopy), indicating that rhoptry expression and localization of RAP1 is conserved between merozoites and sporozoites.\",\n      \"method\": \"Immuno-electron microscopy, RT-PCR for transcript detection in oocyst-derived sporozoites\",\n      \"journal\": \"Frontiers in cellular and infection microbiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — immuno-electron microscopy provides direct localization evidence in sporozoites, single lab\",\n      \"pmids\": [\"31552198\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium berghei\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"In P. berghei, RAP1 deficiency leads to increased early parasitemia but prolonged mouse survival compared to controls; RAP1 is required for targeting RAP2 to the rhoptries (consistent with P. falciparum data), and deletion of RAP1 was associated with attenuated virulence.\",\n      \"method\": \"Genetic disruption (knockout) in P. berghei ANKA, in vivo mouse infection, comparative genomics\",\n      \"journal\": \"Experimental parasitology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic knockout with in vivo phenotypic readout, single lab\",\n      \"pmids\": [\"29307564\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium berghei\", \"strain\": \"ANKA\"}]\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"RAP1 and RAP2 were identified as components of the low-molecular-mass rhoptry protein complex by immunoaffinity purification and LC-MS/MS from P. falciparum merozoites.\",\n      \"method\": \"Immunoaffinity purification, LC-MS/MS\",\n      \"journal\": \"Frontiers in cellular and infection microbiology\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single immunoprecipitation-MS experiment confirming known complex membership, single lab\",\n      \"pmids\": [\"33537242\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"RAP1, RAP2, and RAP3 were identified as associated proteins of PfClag9 by immunoprecipitation and mass spectrometry from P. falciparum merozoite extracts, placing RAP1 within the broader PfClag9-RhopH complex.\",\n      \"method\": \"Immunoprecipitation with anti-PfClag9 antibody, mass spectrometry\",\n      \"journal\": \"Infection and immunity\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single Co-IP/MS experiment identifying RAP1 as associated protein, no direct functional follow-up for RAP1 specifically\",\n      \"pmids\": [\"31712270\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    }\n  ],\n  \"current_model\": \"PF3D7_0105200 (RAP1) is a rhoptry protein of Plasmodium falciparum that functions dually: in blood-stage merozoites it acts as an essential chaperone for RAP2 rhoptry targeting (requiring the secretory/Golgi pathway and interaction with RAMA), forms the low-molecular-weight RAP1/RAP2/RAP3 rhoptry complex, undergoes sequential proteolytic processing (Pr86→p82→p67 by PfSUB1 among others) within the rhoptry, and—post-invasion—contributes to parasitophorous vacuole membrane integrity and intra-erythrocytic parasite survival; additionally, a separate family member sharing the same gene ID has been shown to localize to the mitochondrion in trophozoites, where it functions as an RNA-binding protein (confirmed by eCLIP-seq) that interacts with mitochondrial rRNAs and is essential for mitoribosome activity and parasite survival.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"PF3D7_0105200 (RAP1) is a Plasmodium falciparum rhoptry-associated protein that organizes the low-molecular-weight rhoptry complex and, after invasion, supports intra-erythrocytic parasite survival [#1, #8, #9]. RAP1 is synthesized as an 86-kDa precursor (Pr86) that traffics through the secretory/Golgi pathway—blocked reversibly by brefeldin A and low temperature and irreversibly by N-ethylmaleimide—en route to the rhoptry [#3], where it is proteolytically matured through sequential cleavage to p82 and then p67 [#4], a maturation that includes cleavage by the subtilisin-like protease PfSUB1 [#6]. Trafficking to the rhoptry depends on association with the GPI-anchored protein RAMA, with RAP1 carrying distinct signals for sub-compartment localization and for subsequent transfer to the parasitophorous vacuole [#2, #11]. Within the rhoptry RAP1 is the core component of the RAP1/RAP2 and RAP1/RAP3 complexes [#9] and is required to escort RAP2 to the rhoptry: disruption of RAP1 mislocalizes RAP2 to an ER-like compartment without abolishing erythrocyte invasion [#1]. Functionally, the RAP complex is dispensable for rhoptry morphology and invasion but acts post-invasion to maintain parasitophorous vacuolar membrane integrity and normal intra-erythrocytic growth [#8]; consistent with this, in P. berghei RAP1 deletion attenuates virulence while retaining its RAP2-targeting role [#16]. Separately, the same gene ID was reported to encode a mitochondrion-localized, essential RNA-binding protein (termed PfRAP01) that binds mitochondrial rRNAs and supports mitoribosome activity in trophozoites [#0]; this mitochondrial identity is not reconciled with the rhoptry-protein body of evidence in the available corpus.\",\n  \"teleology\": [\n    {\n      \"year\": 1990,\n      \"claim\": \"The question of whether RAP1's multiple immunodetected forms arise from one gene product was addressed by showing they derive from a common precursor, establishing RAP1 as a processed multi-component antigen.\",\n      \"evidence\": \"immunoaffinity purification, SDS-PAGE, monoclonal antibodies and partial gene sequencing in P. falciparum\",\n      \"pmids\": [\"2200961\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Protease responsible not identified\", \"Functional role of any processed form undefined\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 1992,\n      \"claim\": \"To connect RAP1 processing to parasite biology, inhibitory antibodies were mapped near the p80-to-p65 cleavage site, linking a specific processing event to merozoite release.\",\n      \"evidence\": \"monoclonal antibody epitope mapping with fusion proteins/synthetic peptides and in vitro growth inhibition in P. falciparum\",\n      \"pmids\": [\"1279419\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism of invasion inhibition not defined\", \"Erythrocyte ligand not identified\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 1995,\n      \"claim\": \"The route of RAP1 to the rhoptry was defined as secretory-pathway dependent, showing precursor processing requires transit through the Golgi.\",\n      \"evidence\": \"brefeldin A / low-temperature / NEM treatment plus in vitro translation and immunoprecipitation in P. falciparum\",\n      \"pmids\": [\"8719244\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Nature of the post-translational modification distinguishing the 84-kDa primary product from Pr86 unresolved\", \"Specific transport receptors not identified\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 1998,\n      \"claim\": \"The temporal order of RAP1 maturation was resolved, showing Pr86 is cleaved to p82 then slowly to p67 only after complex formation and delivery to forming rhoptries, implying p67 acts during invasion.\",\n      \"evidence\": \"immunoblot, immunofluorescence, brefeldin A fractionation and epitope mapping in P. falciparum\",\n      \"pmids\": [\"9574915\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Protease(s) executing each cleavage not identified at the time\", \"Functional consequence of p67 generation not tested\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2000,\n      \"claim\": \"Whether RAP1 has a role beyond being a processed antigen was answered by showing it is required to target RAP2 to the rhoptry, defining RAP1 as a chaperone/escort for the complex.\",\n      \"evidence\": \"gene disruption, immunoprecipitation and immunofluorescence in P. falciparum\",\n      \"pmids\": [\"10835342\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular determinants on RAP1 mediating RAP2 escort not mapped\", \"Why invasion is unaffected despite mislocalization not explained\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"The upstream trafficking partner was probed by placing RAP1 in apposition to RAMA in the Golgi/rhoptry pathway, implicating RAMA in RAP1 delivery.\",\n      \"evidence\": \"immunofluorescence co-localization, brefeldin A treatment and indirect immunoprecipitation in P. falciparum\",\n      \"pmids\": [\"14613941\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No direct RAP1-RAMA pull-down demonstrated in this study\", \"Binding interface undefined\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"The possibility of a direct erythrocyte-binding role was explored using RAP1-derived peptides that bind red cells and a 72-kDa membrane protein and inhibit invasion.\",\n      \"evidence\": \"synthetic peptide erythrocyte-binding and invasion inhibition assays in P. falciparum\",\n      \"pmids\": [\"15161083\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Not validated with full-length RAP1 or mutagenesis\", \"Identity of the 72-kDa receptor unknown\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"The complex architecture and a surface-tagging activity were defined: RAP1 is the core of RAP1/RAP2 and RAP1/RAP3 complexes and is specifically required for RAP-complex binding to erythrocyte surfaces.\",\n      \"evidence\": \"BN-PAGE and mass spectrometry of detergent-resistant membranes [#9]; RAP1 gene-disruption and surface iodination [#10] in P. falciparum\",\n      \"pmids\": [\"17553576\", \"17624849\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Biological significance of erythrocyte tagging not established\", \"Composition of higher-order aggregates unresolved\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"The trafficking mechanism was refined by showing RAMA interaction routes RAP1 into the rhoptry and that RAP1 encodes separable signals for sub-compartment localization and post-invasion transfer to the parasitophorous vacuole.\",\n      \"evidence\": \"GFP chimera trafficking assays and in vitro pull-down in P. falciparum\",\n      \"pmids\": [\"19266084\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Precise signal sequences not mapped to residues\", \"Machinery executing PV transfer unknown\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"A specific protease for RAP1 maturation was assigned by identifying RAP1 as a PfSUB1 substrate in the late blood-stage proteome.\",\n      \"evidence\": \"bioinformatic and proteomic substrate analysis in P. falciparum\",\n      \"pmids\": [\"21220481\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Cleavage sites not directly mapped for RAP1\", \"Whether PfSUB1 alone accounts for all processing steps unclear\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Regulation of RAP1 expression and additional trafficking partners were addressed: PfAlba1 binds RAP1 mRNA to time its translation [#12], and the AP-1 subunit Pfmu1 co-precipitates with RAP1 [#13].\",\n      \"evidence\": \"RIP-seq and translational timing analysis [#12]; co-immunoprecipitation and co-localization [#13] in P. falciparum\",\n      \"pmids\": [\"26415947\", \"25573429\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Pfmu1-RAP1 interaction rests on a single Co-IP without trafficking-signal mutagenesis\", \"How translational timing coordinates with rhoptry biogenesis not resolved\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"The long-standing question of RAP1's essential function was reframed by showing the RAP complex is dispensable for invasion but required post-invasion for PVM integrity and intra-erythrocytic growth.\",\n      \"evidence\": \"conditional knockdown, PVM microscopy, growth assays and mouse infection in P. falciparum and P. berghei\",\n      \"pmids\": [\"28205319\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Molecular mechanism by which the RAP complex maintains the PVM unknown\", \"Whether RAP1 acts directly at the PVM not shown\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}, {\"species\": \"Plasmodium berghei\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Cross-species conservation of RAP1 function and its contribution to virulence were tested in P. berghei, confirming RAP2 targeting and revealing attenuated virulence upon RAP1 loss.\",\n      \"evidence\": \"gene knockout and in vivo mouse infection in P. berghei ANKA\",\n      \"pmids\": [\"29307564\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanistic basis of increased early parasitemia yet prolonged survival unresolved\", \"Link between RAP2 mistargeting and virulence not established\"],\n      \"attribution\": [{\"species\": \"Plasmodium berghei\", \"strain\": \"ANKA\"}]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Whether rhoptry localization extends beyond merozoites was answered by demonstrating RAP1 rhoptry localization in P. berghei sporozoites.\",\n      \"evidence\": \"immuno-electron microscopy and RT-PCR in P. berghei sporozoites\",\n      \"pmids\": [\"31552198\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Sporozoite-stage function of RAP1 not tested\", \"Whether the RAP complex assembles in sporozoites unknown\"],\n      \"attribution\": [{\"species\": \"Plasmodium berghei\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"A distinct identity was reported under the same gene ID: an essential mitochondrial RNA-binding protein (PfRAP01) binding mitochondrial rRNAs and supporting mitoribosome activity in trophozoites.\",\n      \"evidence\": \"inducible knockdown, eCLIP-seq, transcriptomics, metabolomics, proteomics and mitochondrial enrichment in P. falciparum\",\n      \"pmids\": [\"35277503\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Not reconciled with the rhoptry-protein literature for this gene ID\", \"Relationship, if any, between mitochondrial and rhoptry pools undefined\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"It remains unresolved how the rhoptry-associated RAP1 body of evidence and the reported mitochondrial RNA-binding activity assigned to the same gene ID relate, and what the direct molecular mechanism of RAP1 in PVM maintenance is.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Two divergent localizations/functions attributed to one gene ID not experimentally reconciled\", \"No structural model of RAP1 or its complexes\", \"Direct RAP1 activity at the PVM undemonstrated\"],\n      \"attribution\": []\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0003723\", \"supporting_discovery_ids\": [0]},\n      {\"term_id\": \"GO:0051082\", \"supporting_discovery_ids\": [1, 2]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0020008\", \"supporting_discovery_ids\": [1, 4, 9, 15]},\n      {\"term_id\": \"GO:0020002\", \"supporting_discovery_ids\": [2, 8]},\n      {\"term_id\": \"GO:0005739\", \"supporting_discovery_ids\": [0]},\n      {\"term_id\": \"GO:0005794\", \"supporting_discovery_ids\": [3, 11]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"GO:0046718\", \"supporting_discovery_ids\": [8, 16]},\n      {\"term_id\": \"GO:0006886\", \"supporting_discovery_ids\": [2, 3, 11]},\n      {\"term_id\": \"GO:0016485\", \"supporting_discovery_ids\": [4, 5, 6, 7]}\n    ],\n    \"complexes\": [\n      \"RAP1/RAP2 low-molecular-weight rhoptry complex [#9, #17]\",\n      \"RAP1/RAP3 low-molecular-weight rhoptry complex [#9]\",\n      \"RAP1/RAP2/RAP3 within the broader PfClag9-RhopH association [#18]\"\n    ],\n    \"partners\": [\n      \"RAP2 (escorted to rhoptry by RAP1) [#1, #16]\",\n      \"RAP3 [#9]\",\n      \"RAMA (GPI-anchored trafficking partner) [#2, #11]\",\n      \"PfSUB1 (protease acting on RAP1) [#6]\",\n      \"PfAlba1 (binds RAP1 mRNA, translational repression) [#12]\",\n      \"Pfmu1 / AP-1 adaptor complex [#13]\",\n      \"PfClag9 [#18]\",\n      \"mitochondrial rRNAs [#0]\"\n    ],\n    \"other_free_text\": [\n      \"Synthesized as an 86-kDa precursor (Pr86) sequentially processed to p82 then p67 within the rhoptry [#3, #4].\",\n      \"Processing near residue ~190 (p80-to-p65) is associated with merozoite release and mapped by inhibitory monoclonal antibodies [#7].\",\n      \"RAP1 is specifically required for RAP-complex binding to the surface of non-parasitized erythrocytes [#10].\",\n      \"RAP1-derived peptides bind erythrocytes and a 72-kDa RBC membrane protein and inhibit invasion (Low confidence) [#14].\",\n      \"A mitochondrial RNA-binding identity (PfRAP01) reported for the same gene ID is not reconciled with the rhoptry-protein evidence in this corpus [#0].\"\n    ]\n  }\n}","audit_flag":null,"strains":[{"strain":"Pf3D7","gene_id":"PF3D7_0105200","name":null,"product":"RAP protein RAP1","uniprot_acc":null,"chromosome":null,"start_pos":null},{"strain":"PbANKA","gene_id":"PBANKA_0208100","name":null,"product":"heptatricopeptide repeat and RAP domain-containing protein, putative","uniprot_acc":null,"chromosome":null,"start_pos":null},{"strain":"PkH","gene_id":"PKNH_0208500","name":null,"product":"heptatricopeptide repeat and RAP domain-containing protein, putative","uniprot_acc":null,"chromosome":null,"start_pos":null}],"gene_symbol":"","evaluation":null}