{"gene":"PF3D7_0707300","run_date":"2026-09-08T12:51:27","timeline":{"discoveries":[{"year":2003,"finding":"RAMA (PF3D7_0707300) is synthesized as a 170-kDa protein in early trophozoites, several hours before rhoptry formation, and is transiently localized within the endoplasmic reticulum and Golgi within lipid-rich microdomains. Regions of the Golgi membrane containing RAMA bud to form vesicles that later mature into rhoptries, a process inhibitable by brefeldin A.","method":"Immunofluorescence, subcellular fractionation, brefeldin A inhibition assay","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct localization experiments with functional inhibitor (brefeldin A) in a single lab, multiple complementary methods","pmids":["14613941"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2003,"finding":"In rhoptries, RAMA is proteolytically processed from a 170-kDa precursor to a 60-kDa form that is anchored in the inner face of the rhoptry membrane via a glycosylphosphatidylinositol (GPI) anchor. The p60 form is discharged from rhoptries of free merozoites and binds to the red blood cell membrane via its C-terminal region. In early ring stages, RAMA is found in association with the parasitophorous vacuole.","method":"Western blot, immunofluorescence, subcellular fractionation, binding assays","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple direct biochemical methods in a single lab establishing processing, GPI anchoring, and RBC membrane binding","pmids":["14613941"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2003,"finding":"Rhoptry proteins RhopH3 and RAP1 are found in close apposition with RAMA, suggesting direct protein-protein interactions, and RAMA is proposed to be involved in trafficking of these proteins into rhoptries.","method":"Co-localization by immunofluorescence/immunoelectron microscopy","journal":"The Journal of biological chemistry","confidence":"Low","confidence_rationale":"Tier 3 / Weak — co-localization only, no biochemical pulldown confirming direct interaction reported in abstract","pmids":["14613941"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2006,"finding":"RAMA (PF3D7_0707300) was confirmed to carry a GPI anchor by proteomic analysis of proteins labeled with radioactive glucosamine, establishing it as one of 11 GPI-anchored proteins in the P. falciparum schizont/merozoite proteome.","method":"Radiolabeling with glucosamine followed by proteomics/mass spectrometry","journal":"Molecular & cellular proteomics : MCP","confidence":"High","confidence_rationale":"Tier 1 / Strong — direct biochemical labeling with mass spectrometry identification, replicated by independent proteomics approach in the same study","pmids":["16603573"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2009,"finding":"RAMA (PF3D7_0707300) escorts RAP1 from the Golgi apparatus to the rhoptry. GFP chimera and in vitro pull-down assays showed that RAP1 trafficking to the rhoptry depends on its interaction with the GPI-anchored rhoptry protein RAMA.","method":"GFP chimera trafficking assay, in vitro pull-down assay","journal":"PLoS pathogens","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — GFP chimera functional trafficking assay combined with pull-down, single lab, two orthogonal methods","pmids":["19266084"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2007,"finding":"RAMA peptides spanning regions 79-97 (33426) and 777-797 (33460) bind to normal human red blood cells with nanomolar affinity, and these high-activity binding peptides inhibit P. falciparum in vitro invasion of RBCs by up to 61%, indicating that these regions of RAMA participate in RBC invasion.","method":"RBC binding assay with synthetic peptides, circular dichroism, in vitro invasion inhibition assay","journal":"Vaccine","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — direct functional binding and invasion inhibition assays, single lab","pmids":["18191882"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2018,"finding":"The P. falciparum homologue of sortilin-VPS10 (PfSortilin) interacts with regions of RAMA that are sufficient to target a fluorescent reporter to rhoptries, suggesting PfSortilin acts as an escorter for transport of RAMA-associated rhoptry cargo from the Golgi to the rhoptries.","method":"Co-immunoprecipitation/interaction assay, fluorescent reporter trafficking assay","journal":"mSphere","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — interaction demonstrated with reporter trafficking assay, single lab, two complementary approaches","pmids":["29299530"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2019,"finding":"Conditional disruption of the RAMA gene (PF3D7_0707300) demonstrated that RAMA is indispensable for blood stage parasite survival. RAMA-null parasites undergo normal intracellular development and egress but display a fatal defect in red blood cell invasion and fail to induce echinocytosis in target RBCs. RAMA is not required for trafficking of all rhoptry bulb proteins; instead, its loss causes selective mislocalisation of a subset of rhoptry bulb and neck proteins (RONs) and produces dysmorphic rhoptries lacking a distinct neck region.","method":"Conditional gene disruption (DiCre-based), electron microscopy, immunofluorescence, invasion assay, echinocytosis assay","journal":"PLoS pathogens","confidence":"High","confidence_rationale":"Tier 2 / Strong — conditional genetic knockout with multiple orthogonal readouts (ultrastructure, invasion, echinocytosis, protein mislocalisation), rigorous controls","pmids":["31491036"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2019,"finding":"RAMA (PF3D7_0707300) localizes to rhoptries in Plasmodium berghei sporozoites as demonstrated by immuno-electron microscopy, indicating RAMA is expressed and rhoptry-targeted in sporozoite-stage parasites as well as merozoites.","method":"Immuno-electron microscopy","journal":"Frontiers in cellular and infection microbiology","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — direct ultrastructural localization by immuno-EM, single study","pmids":["31552198"],"is_preprint":false,"attribution":[{"species":"Plasmodium berghei","strain":""}]},{"year":2021,"finding":"RAMA (PF3D7_0707300) forms a novel complex with rhoptry neck protein 3 (PfRON3) in P. falciparum merozoites, identified by immunoaffinity purification and LC-MS/MS. The region spanning amino acids Q221-E481 within RAMA is implicated in association with PfRON3 in immature schizonts.","method":"Monoclonal antibody generation, immunoprecipitation, LC-MS/MS mass spectrometry, immunofluorescence","journal":"Frontiers in cellular and infection microbiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — immunoprecipitation with mass spectrometry identification and domain mapping, single lab","pmids":["33537242"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2022,"finding":"A monoclonal antibody mapping to the C-terminal region of RAMA (PF3D7_0707300) neutralizes P. falciparum merozoite invasion, and combinations of anti-RAMA antibodies with anti-PfRh5 or anti-PfCyRPA antibodies act synergistically to potentiate invasion inhibition.","method":"Phage display epitope mapping, in vitro invasion inhibition assay, antibody combination assay","journal":"Scientific reports","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional in vitro invasion inhibition with epitope mapping by phage display, single lab","pmids":["35197516"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2008,"finding":"Anti-PfRAMA antibodies have only a weak inhibitory effect on P. falciparum invasion in vitro, and immunisation with recombinant PyRAMA protein did not protect mice against lethal P. yoelii infection nor boost protection induced by MSP4/5.","method":"In vitro invasion inhibition assay, mouse immunisation challenge model (P. yoelii)","journal":"Vaccine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct in vitro and in vivo functional assays, single lab, negative result","pmids":["18468741"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""},{"species":"Plasmodium yoelii","strain":""}]}],"current_model":"RAMA (PF3D7_0707300) is a GPI-anchored rhoptry bulb protein of P. falciparum that is synthesized as a 170-kDa precursor in early trophozoites, traffics through the ER and Golgi (where it associates with lipid-rich microdomains and interacts with PfSortilin for rhoptry targeting), is proteolytically processed to a 60-kDa form in rhoptries, escorts soluble rhoptry proteins such as RAP1 to the rhoptry, forms a complex with rhoptry neck protein RON3, is essential for rhoptry neck morphogenesis and for the selective correct localisation of a subset of RON proteins, and is indispensable for merozoite invasion of red blood cells and induction of echinocytosis, with its C-terminal region mediating RBC membrane binding and containing neutralising epitopes."},"narrative":{"mechanistic_narrative":"RAMA (PF3D7_0707300) is a GPI-anchored rhoptry protein of Plasmodium falciparum that is essential for merozoite invasion of red blood cells and for the biogenesis of the rhoptry organelle [PMID:31491036]. It is synthesized as a 170-kDa precursor in early trophozoites, several hours before rhoptries form, and traffics transiently through the ER and Golgi within lipid-rich microdomains from which vesicles bud and mature into rhoptries; this transit is brefeldin A-sensitive [PMID:14613941]. Golgi-to-rhoptry targeting is mediated by interaction with PfSortilin, which acts as an escorter for RAMA-associated cargo [PMID:29299530]. Within rhoptries RAMA is proteolytically processed to a 60-kDa GPI-anchored form on the inner face of the rhoptry membrane; upon merozoite discharge the p60 form binds the red blood cell membrane through its C-terminal region [PMID:14613941]. RAMA functions as an escorter itself, delivering the soluble rhoptry protein RAP1 from the Golgi to the rhoptry [PMID:19266084], and forms a complex with the rhoptry neck protein PfRON3 via a region spanning Q221–E481 [PMID:33537242]. Conditional disruption establishes that RAMA is indispensable for blood-stage survival: RAMA-null parasites develop and egress normally but fail to invade RBCs and to induce echinocytosis, and its loss selectively mislocalizes a subset of rhoptry bulb and neck (RON) proteins, producing dysmorphic rhoptries that lack a distinct neck [PMID:31491036]. C-terminal and internal peptide regions mediate RBC binding, and antibodies against the C-terminal region neutralize invasion, synergizing with anti-PfRh5 and anti-PfCyRPA antibodies [PMID:18191882, PMID:35197516].","teleology":[{"year":2003,"claim":"Establishing where and when RAMA is made addressed whether rhoptry proteins are pre-positioned during organelle biogenesis, showing RAMA marks the earliest Golgi-derived vesicles that mature into rhoptries.","evidence":"Immunofluorescence, subcellular fractionation, and brefeldin A inhibition in P. falciparum","pmids":["14613941"],"confidence":"Medium","gaps":["Molecular components of the RAMA-containing lipid microdomains not identified","Mechanism linking budding vesicles to mature rhoptries unresolved"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2003,"claim":"Determining how RAMA is anchored and processed clarified its topology and a possible invasion role, showing it is cleaved to a GPI-anchored p60 form that binds the RBC membrane via its C-terminus.","evidence":"Western blot, immunofluorescence, fractionation and RBC binding assays in P. falciparum","pmids":["14613941"],"confidence":"Medium","gaps":["Identity of the protease processing the 170-kDa precursor unknown","RBC receptor for the C-terminal region not identified"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2003,"claim":"Co-localization of RAMA with RhopH3 and RAP1 raised the hypothesis that RAMA participates in trafficking other rhoptry proteins.","evidence":"Immunofluorescence/immuno-EM co-localization in P. falciparum","pmids":["14613941"],"confidence":"Low","gaps":["Co-localization only, no biochemical demonstration of direct interaction in this study","Directionality of any trafficking relationship untested"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2006,"claim":"Independent proteomic confirmation of the GPI anchor settled RAMA's membrane attachment mode across the schizont/merozoite proteome.","evidence":"Glucosamine radiolabeling with mass spectrometry in P. falciparum","pmids":["16603573"],"confidence":"High","gaps":["GPI attachment site not mapped","Functional consequence of the anchor untested here"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2007,"claim":"Mapping RBC-binding activity to defined RAMA peptides tested whether specific regions drive invasion, showing peptides at residues 79-97 and 777-797 bind RBCs and inhibit invasion.","evidence":"Synthetic peptide RBC binding, circular dichroism, and invasion inhibition assays in P. falciparum","pmids":["18191882"],"confidence":"Medium","gaps":["Peptide activity not validated in the context of full-length native protein","RBC receptor not identified"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2008,"claim":"Vaccine testing evaluated whether RAMA is a protective immunogen, showing anti-RAMA antibodies inhibit invasion only weakly and RAMA immunization did not protect mice.","evidence":"In vitro invasion inhibition and P. yoelii mouse challenge in P. falciparum and P. yoelii","pmids":["18468741"],"confidence":"Medium","gaps":["Negative vaccine result does not exclude a role for specific neutralizing epitopes","Cross-species relevance of the P. yoelii model to P. falciparum immunity uncertain"],"attribution":[{"species":"Plasmodium falciparum","strain":""},{"species":"Plasmodium yoelii","strain":""}]},{"year":2009,"claim":"Testing whether RAMA escorts soluble cargo answered how RAP1 reaches the rhoptry, showing RAP1 trafficking depends on interaction with the GPI-anchored RAMA.","evidence":"GFP chimera trafficking and in vitro pull-down assays in P. falciparum","pmids":["19266084"],"confidence":"Medium","gaps":["Whether RAMA escorts additional soluble cargo beyond RAP1 not tested here","Interaction interface with RAP1 not mapped"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2018,"claim":"Identifying the escorter for RAMA itself explained Golgi-to-rhoptry targeting, showing PfSortilin binds RAMA regions sufficient to direct a reporter to rhoptries.","evidence":"Co-immunoprecipitation and fluorescent reporter trafficking in P. falciparum","pmids":["29299530"],"confidence":"Medium","gaps":["Sorting signal within RAMA recognized by PfSortilin not precisely defined","Whether PfSortilin binding is direct or complex-mediated not resolved"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2019,"claim":"Conditional gene disruption defined RAMA's essential in vivo function, showing it is required for RBC invasion, echinocytosis induction, and rhoptry neck morphogenesis via selective correct localization of a subset of RON proteins.","evidence":"DiCre conditional knockout with electron microscopy, immunofluorescence, invasion and echinocytosis assays in P. falciparum","pmids":["31491036"],"confidence":"High","gaps":["Molecular mechanism linking RAMA loss to selective RON mislocalization unresolved","How rhoptry neck architecture depends on a bulb protein not explained"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2019,"claim":"Localization in P. berghei sporozoites tested whether RAMA function extends beyond merozoites, showing rhoptry targeting in sporozoite-stage parasites.","evidence":"Immuno-electron microscopy in P. berghei","pmids":["31552198"],"confidence":"Medium","gaps":["Functional role of RAMA in sporozoites not tested","Whether trafficking machinery is conserved across stages unknown"],"attribution":[{"species":"Plasmodium berghei","strain":""}]},{"year":2021,"claim":"Immunoaffinity purification identified a RAMA–PfRON3 complex, placing RAMA in physical association with rhoptry neck machinery and mapping the interacting region.","evidence":"Immunoprecipitation with LC-MS/MS and immunofluorescence, domain mapping to Q221–E481 in P. falciparum","pmids":["33537242"],"confidence":"Medium","gaps":["Functional consequence of the RAMA-PfRON3 complex not tested","Whether the interaction is direct not established"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2022,"claim":"Epitope-resolved antibody studies revisited RAMA as an invasion-blocking target, showing a C-terminal-directed monoclonal neutralizes invasion and synergizes with anti-PfRh5 and anti-PfCyRPA antibodies.","evidence":"Phage display epitope mapping, invasion inhibition and antibody combination assays in P. falciparum","pmids":["35197516"],"confidence":"Medium","gaps":["Mechanism of synergy with PfRh5/PfCyRPA antibodies not defined","In vivo protective efficacy not addressed"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":null,"claim":"How RAMA mechanistically controls selective RON sorting and rhoptry neck morphogenesis, and the identity of the RBC receptor engaged by its C-terminus, remain unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No molecular model linking a GPI-anchored bulb protein to neck formation","RBC receptor for the C-terminal binding region not identified","Direct versus indirect nature of the PfRON3 and PfSortilin interactions unresolved"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]}],"mechanism_profile":{"molecular_activity":[],"localization":[],"pathway":[],"complexes":["RAMA–PfRON3 complex [#9]"],"partners":["RAP1 (ESCORTED CARGO) [#4]","PFSORTILIN/VPS10 (ESCORTER) [#6]","PFRON3 (COMPLEX PARTNER, Q221-E481 REGION) [#9]","RHOPH3, RAP1 (CO-LOCALIZATION) [#2]"],"other_free_text":["Synthesized as a 170-kDa precursor and proteolytically processed to a 60-kDa GPI-anchored form in rhoptries [#0, #1].","Required for rhoptry neck morphogenesis and selective localization of a subset of RON proteins; loss produces dysmorphic neckless rhoptries [#7].","Essential for merozoite invasion of RBCs and for induction of echinocytosis; not required for intracellular development or egress [#7].","C-terminal region binds RBC membrane and contains neutralizing epitopes; anti-C-terminal antibodies synergize with anti-PfRh5 and anti-PfCyRPA [#1, #5, #10].","RAMA immunization gave no protection in the P. yoelii mouse model and anti-RAMA antibodies were only weakly inhibitory in that study [#11]."]}},"prefetch_data":{},"corpus_meta":[{"pmid":"16603573","id":"PMC_16603573","title":"Identification and stoichiometry of glycosylphosphatidylinositol-anchored membrane proteins of the human malaria parasite Plasmodium falciparum.","date":"2006","source":"Molecular & cellular proteomics : MCP","url":"https://pubmed.ncbi.nlm.nih.gov/16603573","citation_count":216,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["rhoptry-associated membrane 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one","url":"https://pubmed.ncbi.nlm.nih.gov/27182809","citation_count":0,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["rhoptry-associated membrane antigen"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false}],"cost":{"stage1":{"model":"claude-sonnet-4-6","input_tokens":14714,"output_tokens":3131,"usd":0.045553,"stage1_stop_reason":"end_turn"},"stage2":{"model":"claude-opus-4-8","input_tokens":8900,"output_tokens":4713,"usd":0.081162,"stage2_stop_reason":"end_turn"},"total_usd":0.126715,"stage1_batch_id":"msgbatch_01DisAaTypwmC8QwdMBuePHo","stage2_batch_id":"msgbatch_0184zxZTqxiEfdYYfPMfkqjb","note":"batch pricing = 50% of standard"},"stage1_raw":"```json\n{\n  \"discoveries\": [\n    {\n      \"year\": 2003,\n      \"finding\": \"RAMA (PF3D7_0707300) is synthesized as a 170-kDa protein in early trophozoites, several hours before rhoptry formation, and is transiently localized within the endoplasmic reticulum and Golgi within lipid-rich microdomains. Regions of the Golgi membrane containing RAMA bud to form vesicles that later mature into rhoptries, a process inhibitable by brefeldin A.\",\n      \"method\": \"Immunofluorescence, subcellular fractionation, brefeldin A inhibition assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct localization experiments with functional inhibitor (brefeldin A) in a single lab, multiple complementary methods\",\n      \"pmids\": [\"14613941\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"In rhoptries, RAMA is proteolytically processed from a 170-kDa precursor to a 60-kDa form that is anchored in the inner face of the rhoptry membrane via a glycosylphosphatidylinositol (GPI) anchor. The p60 form is discharged from rhoptries of free merozoites and binds to the red blood cell membrane via its C-terminal region. In early ring stages, RAMA is found in association with the parasitophorous vacuole.\",\n      \"method\": \"Western blot, immunofluorescence, subcellular fractionation, binding assays\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple direct biochemical methods in a single lab establishing processing, GPI anchoring, and RBC membrane binding\",\n      \"pmids\": [\"14613941\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Rhoptry proteins RhopH3 and RAP1 are found in close apposition with RAMA, suggesting direct protein-protein interactions, and RAMA is proposed to be involved in trafficking of these proteins into rhoptries.\",\n      \"method\": \"Co-localization by immunofluorescence/immunoelectron microscopy\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — co-localization only, no biochemical pulldown confirming direct interaction reported in abstract\",\n      \"pmids\": [\"14613941\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"RAMA (PF3D7_0707300) was confirmed to carry a GPI anchor by proteomic analysis of proteins labeled with radioactive glucosamine, establishing it as one of 11 GPI-anchored proteins in the P. falciparum schizont/merozoite proteome.\",\n      \"method\": \"Radiolabeling with glucosamine followed by proteomics/mass spectrometry\",\n      \"journal\": \"Molecular & cellular proteomics : MCP\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — direct biochemical labeling with mass spectrometry identification, replicated by independent proteomics approach in the same study\",\n      \"pmids\": [\"16603573\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"RAMA (PF3D7_0707300) escorts RAP1 from the Golgi apparatus to the rhoptry. GFP chimera and in vitro pull-down assays showed that RAP1 trafficking to the rhoptry depends on its interaction with the GPI-anchored rhoptry protein RAMA.\",\n      \"method\": \"GFP chimera trafficking assay, in vitro pull-down assay\",\n      \"journal\": \"PLoS pathogens\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — GFP chimera functional trafficking assay combined with pull-down, single lab, two orthogonal methods\",\n      \"pmids\": [\"19266084\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"RAMA peptides spanning regions 79-97 (33426) and 777-797 (33460) bind to normal human red blood cells with nanomolar affinity, and these high-activity binding peptides inhibit P. falciparum in vitro invasion of RBCs by up to 61%, indicating that these regions of RAMA participate in RBC invasion.\",\n      \"method\": \"RBC binding assay with synthetic peptides, circular dichroism, in vitro invasion inhibition assay\",\n      \"journal\": \"Vaccine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — direct functional binding and invasion inhibition assays, single lab\",\n      \"pmids\": [\"18191882\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"The P. falciparum homologue of sortilin-VPS10 (PfSortilin) interacts with regions of RAMA that are sufficient to target a fluorescent reporter to rhoptries, suggesting PfSortilin acts as an escorter for transport of RAMA-associated rhoptry cargo from the Golgi to the rhoptries.\",\n      \"method\": \"Co-immunoprecipitation/interaction assay, fluorescent reporter trafficking assay\",\n      \"journal\": \"mSphere\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — interaction demonstrated with reporter trafficking assay, single lab, two complementary approaches\",\n      \"pmids\": [\"29299530\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Conditional disruption of the RAMA gene (PF3D7_0707300) demonstrated that RAMA is indispensable for blood stage parasite survival. RAMA-null parasites undergo normal intracellular development and egress but display a fatal defect in red blood cell invasion and fail to induce echinocytosis in target RBCs. RAMA is not required for trafficking of all rhoptry bulb proteins; instead, its loss causes selective mislocalisation of a subset of rhoptry bulb and neck proteins (RONs) and produces dysmorphic rhoptries lacking a distinct neck region.\",\n      \"method\": \"Conditional gene disruption (DiCre-based), electron microscopy, immunofluorescence, invasion assay, echinocytosis assay\",\n      \"journal\": \"PLoS pathogens\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — conditional genetic knockout with multiple orthogonal readouts (ultrastructure, invasion, echinocytosis, protein mislocalisation), rigorous controls\",\n      \"pmids\": [\"31491036\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"RAMA (PF3D7_0707300) localizes to rhoptries in Plasmodium berghei sporozoites as demonstrated by immuno-electron microscopy, indicating RAMA is expressed and rhoptry-targeted in sporozoite-stage parasites as well as merozoites.\",\n      \"method\": \"Immuno-electron microscopy\",\n      \"journal\": \"Frontiers in cellular and infection microbiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — direct ultrastructural localization by immuno-EM, single study\",\n      \"pmids\": [\"31552198\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium berghei\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"RAMA (PF3D7_0707300) forms a novel complex with rhoptry neck protein 3 (PfRON3) in P. falciparum merozoites, identified by immunoaffinity purification and LC-MS/MS. The region spanning amino acids Q221-E481 within RAMA is implicated in association with PfRON3 in immature schizonts.\",\n      \"method\": \"Monoclonal antibody generation, immunoprecipitation, LC-MS/MS mass spectrometry, immunofluorescence\",\n      \"journal\": \"Frontiers in cellular and infection microbiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — immunoprecipitation with mass spectrometry identification and domain mapping, single lab\",\n      \"pmids\": [\"33537242\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"A monoclonal antibody mapping to the C-terminal region of RAMA (PF3D7_0707300) neutralizes P. falciparum merozoite invasion, and combinations of anti-RAMA antibodies with anti-PfRh5 or anti-PfCyRPA antibodies act synergistically to potentiate invasion inhibition.\",\n      \"method\": \"Phage display epitope mapping, in vitro invasion inhibition assay, antibody combination assay\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional in vitro invasion inhibition with epitope mapping by phage display, single lab\",\n      \"pmids\": [\"35197516\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Anti-PfRAMA antibodies have only a weak inhibitory effect on P. falciparum invasion in vitro, and immunisation with recombinant PyRAMA protein did not protect mice against lethal P. yoelii infection nor boost protection induced by MSP4/5.\",\n      \"method\": \"In vitro invasion inhibition assay, mouse immunisation challenge model (P. yoelii)\",\n      \"journal\": \"Vaccine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct in vitro and in vivo functional assays, single lab, negative result\",\n      \"pmids\": [\"18468741\"],\n      \"is_preprint\": false,\n      \"attribution\": [\n        {\"species\": \"Plasmodium falciparum\", \"strain\": \"\"},\n        {\"species\": \"Plasmodium yoelii\", \"strain\": \"\"}\n      ]\n    }\n  ],\n  \"current_model\": \"RAMA (PF3D7_0707300) is a GPI-anchored rhoptry bulb protein of P. falciparum that is synthesized as a 170-kDa precursor in early trophozoites, traffics through the ER and Golgi (where it associates with lipid-rich microdomains and interacts with PfSortilin for rhoptry targeting), is proteolytically processed to a 60-kDa form in rhoptries, escorts soluble rhoptry proteins such as RAP1 to the rhoptry, forms a complex with rhoptry neck protein RON3, is essential for rhoptry neck morphogenesis and for the selective correct localisation of a subset of RON proteins, and is indispensable for merozoite invasion of red blood cells and induction of echinocytosis, with its C-terminal region mediating RBC membrane binding and containing neutralising epitopes.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"RAMA (PF3D7_0707300) is a GPI-anchored rhoptry protein of Plasmodium falciparum that is essential for merozoite invasion of red blood cells and for the biogenesis of the rhoptry organelle [#7]. It is synthesized as a 170-kDa precursor in early trophozoites, several hours before rhoptries form, and traffics transiently through the ER and Golgi within lipid-rich microdomains from which vesicles bud and mature into rhoptries; this transit is brefeldin A-sensitive [#0]. Golgi-to-rhoptry targeting is mediated by interaction with PfSortilin, which acts as an escorter for RAMA-associated cargo [#6]. Within rhoptries RAMA is proteolytically processed to a 60-kDa GPI-anchored form on the inner face of the rhoptry membrane; upon merozoite discharge the p60 form binds the red blood cell membrane through its C-terminal region [#1]. RAMA functions as an escorter itself, delivering the soluble rhoptry protein RAP1 from the Golgi to the rhoptry [#4], and forms a complex with the rhoptry neck protein PfRON3 via a region spanning Q221–E481 [#9]. Conditional disruption establishes that RAMA is indispensable for blood-stage survival: RAMA-null parasites develop and egress normally but fail to invade RBCs and to induce echinocytosis, and its loss selectively mislocalizes a subset of rhoptry bulb and neck (RON) proteins, producing dysmorphic rhoptries that lack a distinct neck [#7]. C-terminal and internal peptide regions mediate RBC binding, and antibodies against the C-terminal region neutralize invasion, synergizing with anti-PfRh5 and anti-PfCyRPA antibodies [#5, #10].\",\n  \"teleology\": [\n    {\n      \"year\": 2003,\n      \"claim\": \"Establishing where and when RAMA is made addressed whether rhoptry proteins are pre-positioned during organelle biogenesis, showing RAMA marks the earliest Golgi-derived vesicles that mature into rhoptries.\",\n      \"evidence\": \"Immunofluorescence, subcellular fractionation, and brefeldin A inhibition in P. falciparum\",\n      \"pmids\": [\"14613941\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Molecular components of the RAMA-containing lipid microdomains not identified\", \"Mechanism linking budding vesicles to mature rhoptries unresolved\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Determining how RAMA is anchored and processed clarified its topology and a possible invasion role, showing it is cleaved to a GPI-anchored p60 form that binds the RBC membrane via its C-terminus.\",\n      \"evidence\": \"Western blot, immunofluorescence, fractionation and RBC binding assays in P. falciparum\",\n      \"pmids\": [\"14613941\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Identity of the protease processing the 170-kDa precursor unknown\", \"RBC receptor for the C-terminal region not identified\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Co-localization of RAMA with RhopH3 and RAP1 raised the hypothesis that RAMA participates in trafficking other rhoptry proteins.\",\n      \"evidence\": \"Immunofluorescence/immuno-EM co-localization in P. falciparum\",\n      \"pmids\": [\"14613941\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Co-localization only, no biochemical demonstration of direct interaction in this study\", \"Directionality of any trafficking relationship untested\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Independent proteomic confirmation of the GPI anchor settled RAMA's membrane attachment mode across the schizont/merozoite proteome.\",\n      \"evidence\": \"Glucosamine radiolabeling with mass spectrometry in P. falciparum\",\n      \"pmids\": [\"16603573\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"GPI attachment site not mapped\", \"Functional consequence of the anchor untested here\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Mapping RBC-binding activity to defined RAMA peptides tested whether specific regions drive invasion, showing peptides at residues 79-97 and 777-797 bind RBCs and inhibit invasion.\",\n      \"evidence\": \"Synthetic peptide RBC binding, circular dichroism, and invasion inhibition assays in P. falciparum\",\n      \"pmids\": [\"18191882\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Peptide activity not validated in the context of full-length native protein\", \"RBC receptor not identified\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Vaccine testing evaluated whether RAMA is a protective immunogen, showing anti-RAMA antibodies inhibit invasion only weakly and RAMA immunization did not protect mice.\",\n      \"evidence\": \"In vitro invasion inhibition and P. yoelii mouse challenge in P. falciparum and P. yoelii\",\n      \"pmids\": [\"18468741\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Negative vaccine result does not exclude a role for specific neutralizing epitopes\", \"Cross-species relevance of the P. yoelii model to P. falciparum immunity uncertain\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}, {\"species\": \"Plasmodium yoelii\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Testing whether RAMA escorts soluble cargo answered how RAP1 reaches the rhoptry, showing RAP1 trafficking depends on interaction with the GPI-anchored RAMA.\",\n      \"evidence\": \"GFP chimera trafficking and in vitro pull-down assays in P. falciparum\",\n      \"pmids\": [\"19266084\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether RAMA escorts additional soluble cargo beyond RAP1 not tested here\", \"Interaction interface with RAP1 not mapped\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"Identifying the escorter for RAMA itself explained Golgi-to-rhoptry targeting, showing PfSortilin binds RAMA regions sufficient to direct a reporter to rhoptries.\",\n      \"evidence\": \"Co-immunoprecipitation and fluorescent reporter trafficking in P. falciparum\",\n      \"pmids\": [\"29299530\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Sorting signal within RAMA recognized by PfSortilin not precisely defined\", \"Whether PfSortilin binding is direct or complex-mediated not resolved\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Conditional gene disruption defined RAMA's essential in vivo function, showing it is required for RBC invasion, echinocytosis induction, and rhoptry neck morphogenesis via selective correct localization of a subset of RON proteins.\",\n      \"evidence\": \"DiCre conditional knockout with electron microscopy, immunofluorescence, invasion and echinocytosis assays in P. falciparum\",\n      \"pmids\": [\"31491036\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular mechanism linking RAMA loss to selective RON mislocalization unresolved\", \"How rhoptry neck architecture depends on a bulb protein not explained\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Localization in P. berghei sporozoites tested whether RAMA function extends beyond merozoites, showing rhoptry targeting in sporozoite-stage parasites.\",\n      \"evidence\": \"Immuno-electron microscopy in P. berghei\",\n      \"pmids\": [\"31552198\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Functional role of RAMA in sporozoites not tested\", \"Whether trafficking machinery is conserved across stages unknown\"],\n      \"attribution\": [{\"species\": \"Plasmodium berghei\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Immunoaffinity purification identified a RAMA–PfRON3 complex, placing RAMA in physical association with rhoptry neck machinery and mapping the interacting region.\",\n      \"evidence\": \"Immunoprecipitation with LC-MS/MS and immunofluorescence, domain mapping to Q221–E481 in P. falciparum\",\n      \"pmids\": [\"33537242\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Functional consequence of the RAMA-PfRON3 complex not tested\", \"Whether the interaction is direct not established\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Epitope-resolved antibody studies revisited RAMA as an invasion-blocking target, showing a C-terminal-directed monoclonal neutralizes invasion and synergizes with anti-PfRh5 and anti-PfCyRPA antibodies.\",\n      \"evidence\": \"Phage display epitope mapping, invasion inhibition and antibody combination assays in P. falciparum\",\n      \"pmids\": [\"35197516\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Mechanism of synergy with PfRh5/PfCyRPA antibodies not defined\", \"In vivo protective efficacy not addressed\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How RAMA mechanistically controls selective RON sorting and rhoptry neck morphogenesis, and the identity of the RBC receptor engaged by its C-terminus, remain unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No molecular model linking a GPI-anchored bulb protein to neck formation\", \"RBC receptor for the C-terminal binding region not identified\", \"Direct versus indirect nature of the PfRON3 and PfSortilin interactions unresolved\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0005515\", \"supporting_discovery_ids\": [4, 6, 9]},\n      {\"term_id\": \"GO:0140318\", \"supporting_discovery_ids\": [4]},\n      {\"term_id\": \"GO:0030246\", \"supporting_discovery_ids\": [1, 5]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0020008\", \"supporting_discovery_ids\": [0, 1, 7, 8]},\n      {\"term_id\": \"GO:0005789\", \"supporting_discovery_ids\": [0]},\n      {\"term_id\": \"GO:0005794\", \"supporting_discovery_ids\": [0, 4]},\n      {\"term_id\": \"GO:0046658\", \"supporting_discovery_ids\": [1, 3]},\n      {\"term_id\": \"GO:0020003\", \"supporting_discovery_ids\": [1]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"GO:0044409\", \"supporting_discovery_ids\": [5, 7, 10]},\n      {\"term_id\": \"GO:0006886\", \"supporting_discovery_ids\": [0, 4, 6]}\n    ],\n    \"complexes\": [\n      \"RAMA–PfRON3 complex [#9]\"\n    ],\n    \"partners\": [\n      \"RAP1 (escorted cargo) [#4]\",\n      \"PfSortilin/VPS10 (escorter) [#6]\",\n      \"PfRON3 (complex partner, Q221-E481 region) [#9]\",\n      \"RhopH3, RAP1 (co-localization) [#2]\"\n    ],\n    \"other_free_text\": [\n      \"Synthesized as a 170-kDa precursor and proteolytically processed to a 60-kDa GPI-anchored form in rhoptries [#0, #1].\",\n      \"Required for rhoptry neck morphogenesis and selective localization of a subset of RON proteins; loss produces dysmorphic neckless rhoptries [#7].\",\n      \"Essential for merozoite invasion of RBCs and for induction of echinocytosis; not required for intracellular development or egress [#7].\",\n      \"C-terminal region binds RBC membrane and contains neutralizing epitopes; anti-C-terminal antibodies synergize with anti-PfRh5 and anti-PfCyRPA [#1, #5, #10].\",\n      \"RAMA immunization gave no protection in the P. yoelii mouse model and anti-RAMA antibodies were only weakly inhibitory in that study [#11].\"\n    ]\n  }\n}","audit_flag":null,"strains":[{"strain":"Pf3D7","gene_id":"PF3D7_0707300","name":null,"product":"rhoptry-associated membrane antigen","uniprot_acc":null,"chromosome":null,"start_pos":null},{"strain":"PbANKA","gene_id":"PBANKA_0804500","name":null,"product":"rhoptry-associated membrane antigen, putative","uniprot_acc":null,"chromosome":null,"start_pos":null},{"strain":"PkH","gene_id":"PKNH_0105800","name":null,"product":"rhoptry-associated membrane antigen, putative","uniprot_acc":null,"chromosome":null,"start_pos":null}],"gene_symbol":"RAMA","evaluation":null}