{"gene":"PF3D7_0402300","run_date":"2026-09-07T10:55:51","timeline":{"discoveries":[{"year":2001,"finding":"RH1 (then called PfNBP1) binds to a sialic acid-dependent, trypsin-resistant receptor on the erythrocyte surface that is distinct from known invasion receptors; antibodies against RH1 inhibit invasion of trypsinized erythrocytes, and P. falciparum strains expressing truncated RH1 are unable to invade trypsinized erythrocytes.","method":"Erythrocyte binding assays, invasion inhibition with anti-RH1 antibodies, analysis of truncated-RH1 parasite strains on enzyme-treated erythrocytes","journal":"The Journal of experimental medicine","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods (binding assay, antibody inhibition, natural truncation strains) with consistent results; replicated across strains","pmids":["11733572"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2002,"finding":"RH1 protein is expressed in late schizonts and merozoites and localizes to apical organelles and the apical surface; however, in 3D7 and T996 strains it does not appear to be correctly targeted to the apex, whereas in FCB1 it is present at the apical end.","method":"Immunofluorescence and protein expression analysis of late schizonts/merozoites in multiple parasite lines","journal":"Infection and immunity","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — direct localization by immunofluorescence across three strains, single lab, no functional consequence directly linked","pmids":["12228308"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":"3D7"},{"species":"Plasmodium falciparum","strain":"T996"},{"species":"Plasmodium falciparum","strain":"FCB1"}]},{"year":2005,"finding":"Targeted gene disruption of RH1 in P. falciparum demonstrates that RH1 is required for sialic acid-dependent invasion of human erythrocytes; ΔRH1 parasites shift to a more neuraminidase-resistant invasion pattern, indicating that RH1 directs sialic acid-dependent receptor usage.","method":"Targeted gene disruption (knockout), invasion assays with neuraminidase-treated erythrocytes","journal":"Molecular microbiology","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean genetic knockout with defined invasion phenotype and enzyme-treatment assays; single lab but rigorous loss-of-function approach with clear mechanistic readout","pmids":["15612925"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2006,"finding":"PfROM4 (PFE0340c) can cleave RH1 in a heterologous rhomboid protease cleavage assay, with cleavage dependent on the RH1 transmembrane domain; PfROM1 (PF11_0150) can also cleave RH1.","method":"Heterologous rhomboid protease cleavage assay; transmembrane domain swap experiments","journal":"PLoS pathogens","confidence":"Medium","confidence_rationale":"Tier 1 / Weak — in vitro enzymatic assay with mutagenesis (TM swap), but performed in a heterologous system, single study","pmids":["17040128"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2008,"finding":"The erythrocyte-binding region of RH1 was identified within the N-terminal portion of the protein; antibodies raised against this functional binding region efficiently inhibit merozoite invasion.","method":"Erythrocyte binding assays with RH1 fragments, invasion inhibition assays with region-specific antibodies","journal":"PLoS pathogens","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct binding domain mapping combined with functional invasion inhibition, single lab, two orthogonal approaches","pmids":["18617995"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2009,"finding":"RH1 undergoes proteolytic processing events before and during erythrocyte invasion; the ectodomain is processed to produce fragments consistent with cleavage in the transmembrane domain, and processed fragments are released into the supernatant in a manner consistent with rhomboid protease cleavage. RH1 is also a component of the tight junction linking the erythrocyte to the actin-myosin motor during invasion.","method":"Immunoblot analysis of processing products, supernatant release assays, functional invasion assays","journal":"Cellular microbiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — biochemical processing analysis plus functional context, single lab, multiple approaches but no direct mutagenesis of cleavage sites","pmids":["19614665"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2013,"finding":"Monoclonal antibodies against RH1 block merozoite invasion by specifically inhibiting calcium signalling in the parasite; this inhibition prevents EBA175 discharge and thus blocks formation of the tight junction between parasite and host cell. RH1 therefore functions upstream as a sensor and signal transducer that triggers calcium signalling leading to EBA175 release.","method":"Invasion inhibition assays with anti-RH1 monoclonal antibodies, calcium signalling measurements, EBA175 discharge assays","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal assays (invasion inhibition, Ca2+ signalling, EBA175 discharge) establishing a mechanistic pathway position for RH1, single lab but rigorous multi-method approach","pmids":["24280897"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2013,"finding":"RH1 binds to heparin; all tested members of the reticulocyte binding-like family bound heparin with diverse affinities, suggesting heparin masks the apical merozoite surface and blocks RH1-erythrocyte interaction.","method":"Heparin affinity chromatography fractionation, immunoblot with ligand-specific antibodies","journal":"Scientific reports","confidence":"Low","confidence_rationale":"Tier 3 / Weak — single pulldown/affinity chromatography method, single lab, no functional mutagenesis of the binding site","pmids":["24212193"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2014,"finding":"The cytoplasmic tail domain (CTD) of RH1 promotes actin polymerization in vitro independently of aldolase, suggesting that RH1's CTD can directly recruit and stabilize actin filaments during motor assembly.","method":"Biolayer interferometry, co-sedimentation assays, in vitro actin polymerization assays with recombinant RH1 CTD","journal":"Molecular and biochemical parasitology","confidence":"Medium","confidence_rationale":"Tier 1 / Moderate — in vitro biochemical reconstitution with purified components, single lab, two orthogonal methods (polymerization assay and sedimentation)","pmids":["25261592"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2020,"finding":"RH1 is differentially processed during merozoite maturation and invasion, generating distinct processing products with different functional roles; a subset of RH1 processing products form a close spatial association with micronemal protein AMA1 at the moving junction, as shown by in-situ Proximity Ligation and FRET assays, suggesting RH1 facilitates junction formation during active invasion.","method":"Monoclonal antibodies against different RH1 regions, in-situ Proximity Ligation Assay (PLA), FRET assays, immunofluorescence","journal":"Cellular microbiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — two nanometre-scale interaction assays (PLA and FRET) plus processing analysis, single lab, mechanistic placement at junction with AMA1","pmids":["32452132"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2025,"finding":"Loss of RH1 (gene disruption) substantially reduces susceptibility of P. falciparum to inhibitory antibodies from malaria-exposed individuals, demonstrating that RH1 is a significant target of naturally acquired invasion-inhibitory antibodies and that variation in RH1 expression contributes to immune evasion.","method":"Gene disruption (knockout) of pfrh1, invasion inhibition assays with human immune sera from Kenyan children and adults","journal":"Frontiers in immunology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — clean KO with defined immune-evasion phenotype, single study, functional readout with human sera","pmids":["40201183"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]}],"current_model":"RH1 (PF3D7_0402300) is a P. falciparum merozoite apical protein that mediates sialic acid-dependent, trypsin-resistant erythrocyte invasion by binding a distinct erythrocyte surface receptor; upon host-cell contact it acts as a sensor/signal transducer that triggers parasite calcium signalling leading to EBA175 discharge and tight-junction formation, after which its ectodomain is proteolytically cleaved (likely by rhomboid proteases PfROM1/4) and released, while its cytoplasmic tail independently promotes actin polymerization, and a subset of its processing products associates closely with AMA1 at the moving junction to facilitate active invasion."},"narrative":{"mechanistic_narrative":"RH1 (PF3D7_0402300) is a P. falciparum merozoite apical protein that directs the sialic acid-dependent, trypsin-resistant pathway of erythrocyte invasion by binding a distinct erythrocyte surface receptor [PMID:11733572, PMID:15612925]. It is expressed in late schizonts and merozoites and localizes to apical organelles and the apical surface, with the erythrocyte-binding activity residing in an N-terminal region whose region-specific antibodies inhibit invasion [PMID:12228308, PMID:18617995]. Beyond receptor engagement, RH1 acts upstream as a sensor and signal transducer: antibody blockade of RH1 inhibits parasite calcium signalling, preventing EBA175 discharge and tight-junction formation [PMID:24280897]. During invasion RH1 is proteolytically processed, releasing ectodomain fragments in a manner consistent with transmembrane-domain cleavage by rhomboid proteases (PfROM4 and PfROM1 can cleave RH1 in vitro), and a subset of processing products associates closely with AMA1 at the moving junction [PMID:17040128, PMID:19614665, PMID:32452132]. Its cytoplasmic tail domain independently promotes actin polymerization in vitro, linking RH1 to the invasion motor [PMID:25261592]. RH1 is also a target of naturally acquired invasion-inhibitory antibodies, and variation in its expression contributes to immune evasion [PMID:40201183].","teleology":[{"year":2001,"claim":"Established that RH1 engages a previously unrecognized erythrocyte receptor, defining a distinct sialic acid-dependent, trypsin-resistant entry route.","evidence":"Erythrocyte binding assays, antibody invasion inhibition, and analysis of truncated-RH1 strains on enzyme-treated cells","pmids":["11733572"],"confidence":"High","gaps":["The molecular identity of the erythrocyte receptor was not defined","No structural characterization of the binding interaction"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2002,"claim":"Placed RH1 protein temporally and spatially in the merozoite, showing apical organelle localization with strain-dependent trafficking differences.","evidence":"Immunofluorescence and expression analysis of late schizonts/merozoites across 3D7, T996, and FCB1 lines","pmids":["12228308"],"confidence":"Medium","gaps":["Functional consequence of mistargeting in 3D7/T996 not established","Single lab, no complementation of trafficking defect"],"attribution":[{"species":"Plasmodium falciparum","strain":"3D7"},{"species":"Plasmodium falciparum","strain":"T996"},{"species":"Plasmodium falciparum","strain":"FCB1"}]},{"year":2005,"claim":"Demonstrated genetically that RH1 is required for sialic acid-dependent invasion and dictates receptor-usage pathway selection.","evidence":"Targeted gene disruption and invasion assays with neuraminidase-treated erythrocytes","pmids":["15612925"],"confidence":"High","gaps":["Does not identify the cognate receptor","Redundancy with sibling family members not fully resolved"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2006,"claim":"Identified candidate proteases for RH1 shedding, showing PfROM4 and PfROM1 cleave RH1 in a transmembrane-domain-dependent manner.","evidence":"Heterologous rhomboid protease cleavage assay with transmembrane-domain swaps","pmids":["17040128"],"confidence":"Medium","gaps":["Cleavage shown in a heterologous system, not in the parasite","In vivo protease responsible for RH1 shedding not confirmed"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2008,"claim":"Mapped the erythrocyte-binding activity to the N-terminal region and validated it as a functional, antibody-accessible invasion target.","evidence":"Erythrocyte binding assays with RH1 fragments and invasion inhibition with region-specific antibodies","pmids":["18617995"],"confidence":"Medium","gaps":["No high-resolution structure of the binding domain","Receptor contact residues not defined"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2009,"claim":"Showed RH1 is proteolytically processed with ectodomain release before/during invasion and is a component of the tight junction linking erythrocyte to the actin-myosin motor.","evidence":"Immunoblot processing analysis, supernatant release assays, functional invasion assays","pmids":["19614665"],"confidence":"Medium","gaps":["Cleavage sites not defined by mutagenesis","Direct protease identity in the parasite not established"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2013,"claim":"Positioned RH1 upstream in the invasion signalling cascade as a sensor that triggers calcium signalling to drive EBA175 discharge and junction formation.","evidence":"Anti-RH1 monoclonal antibody invasion inhibition, calcium signalling measurements, EBA175 discharge assays","pmids":["24280897"],"confidence":"High","gaps":["The intracellular transduction pathway connecting RH1 engagement to calcium release is undefined","How antibody binding blocks signalling mechanistically is unresolved"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2013,"claim":"Reported that RH1 binds heparin, raising the possibility that heparin masks the apical surface to block RH1-erythrocyte interaction.","evidence":"Heparin affinity chromatography fractionation and ligand-specific immunoblot","pmids":["24212193"],"confidence":"Low","gaps":["Single pulldown method with no functional mutagenesis of the binding site","Physiological relevance of heparin binding not established","Shared across the family, not RH1-specific"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2014,"claim":"Revealed a motor-linked function for the RH1 cytoplasmic tail, which promotes actin polymerization independently of aldolase.","evidence":"Biolayer interferometry, co-sedimentation, and in vitro actin polymerization assays with recombinant RH1 CTD","pmids":["25261592"],"confidence":"Medium","gaps":["Activity shown in vitro only, not in the parasite","Direct binding partners of the CTD not identified"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2020,"claim":"Linked RH1 processing products to the moving junction by demonstrating a close spatial association with AMA1 during active invasion.","evidence":"Region-specific monoclonal antibodies with in-situ Proximity Ligation Assay, FRET, and immunofluorescence","pmids":["32452132"],"confidence":"Medium","gaps":["Whether the RH1-AMA1 proximity reflects a direct interaction is not established","Functional requirement of the association for junction formation not tested"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2025,"claim":"Established RH1 as a target of naturally acquired invasion-inhibitory antibodies and a contributor to immune evasion via expression variation.","evidence":"pfrh1 gene disruption and invasion inhibition assays with human immune sera from Kenyan children and adults","pmids":["40201183"],"confidence":"Medium","gaps":["Specific epitopes recognized by natural antibodies not mapped","Single study, contribution relative to other invasion antigens not quantified"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":null,"claim":"The molecular identity of the RH1 erythrocyte receptor and the intracellular machinery linking RH1 engagement to calcium signalling remain unknown.","evidence":"","pmids":[],"confidence":"Medium","gaps":["Cognate erythrocyte receptor unidentified","Signal transduction components downstream of RH1 undefined","No parasite-confirmed protease or cleavage-site mapping"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]}],"mechanism_profile":{"molecular_activity":[],"localization":[],"pathway":[],"complexes":["Moving junction / tight junction complex associated with AMA1 [#5, #9]"],"partners":["PFROM4 (PROTEASE THAT CLEAVES RH1) [#3]","PFROM1 (PROTEASE THAT CLEAVES RH1) [#3]","AMA1 (CLOSE SPATIAL ASSOCIATION AT MOVING JUNCTION) [#9]","EBA175 (DISCHARGE DOWNSTREAM OF RH1 SIGNALLING) [#6]","ACTIN (RECRUITED/POLYMERIZED BY RH1 CYTOPLASMIC TAIL) [#8]"],"other_free_text":["Binds a sialic acid-dependent, trypsin-resistant erythrocyte receptor distinct from known invasion receptors; receptor identity not defined [#0]","Erythrocyte-binding activity maps to the N-terminal region [#4]","Ectodomain is proteolytically processed and released, consistent with transmembrane-domain cleavage during invasion [#5]","Acts upstream as a sensor/signal transducer triggering parasite calcium signalling that drives EBA175 discharge [#6]","Target of naturally acquired invasion-inhibitory antibodies; expression variation contributes to immune evasion [#10]"]}},"prefetch_data":{},"corpus_meta":[{"pmid":"17040128","id":"PMC_17040128","title":"Two Plasmodium rhomboid proteases preferentially cleave different adhesins implicated in all invasive stages of malaria.","date":"2006","source":"PLoS 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trypsinized erythrocytes, and P. falciparum strains expressing truncated RH1 are unable to invade trypsinized erythrocytes.\",\n      \"method\": \"Erythrocyte binding assays, invasion inhibition with anti-RH1 antibodies, analysis of truncated-RH1 parasite strains on enzyme-treated erythrocytes\",\n      \"journal\": \"The Journal of experimental medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods (binding assay, antibody inhibition, natural truncation strains) with consistent results; replicated across strains\",\n      \"pmids\": [\"11733572\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"RH1 protein is expressed in late schizonts and merozoites and localizes to apical organelles and the apical surface; however, in 3D7 and T996 strains it does not appear to be correctly targeted to the apex, whereas in FCB1 it is present at the apical end.\",\n      \"method\": \"Immunofluorescence and protein expression analysis of late schizonts/merozoites in multiple parasite lines\",\n      \"journal\": \"Infection and immunity\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — direct localization by immunofluorescence across three strains, single lab, no functional consequence directly linked\",\n      \"pmids\": [\"12228308\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"3D7\"}, {\"species\": \"Plasmodium falciparum\", \"strain\": \"T996\"}, {\"species\": \"Plasmodium falciparum\", \"strain\": \"FCB1\"}]\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Targeted gene disruption of RH1 in P. falciparum demonstrates that RH1 is required for sialic acid-dependent invasion of human erythrocytes; ΔRH1 parasites shift to a more neuraminidase-resistant invasion pattern, indicating that RH1 directs sialic acid-dependent receptor usage.\",\n      \"method\": \"Targeted gene disruption (knockout), invasion assays with neuraminidase-treated erythrocytes\",\n      \"journal\": \"Molecular microbiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean genetic knockout with defined invasion phenotype and enzyme-treatment assays; single lab but rigorous loss-of-function approach with clear mechanistic readout\",\n      \"pmids\": [\"15612925\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"PfROM4 (PFE0340c) can cleave RH1 in a heterologous rhomboid protease cleavage assay, with cleavage dependent on the RH1 transmembrane domain; PfROM1 (PF11_0150) can also cleave RH1.\",\n      \"method\": \"Heterologous rhomboid protease cleavage assay; transmembrane domain swap experiments\",\n      \"journal\": \"PLoS pathogens\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Weak — in vitro enzymatic assay with mutagenesis (TM swap), but performed in a heterologous system, single study\",\n      \"pmids\": [\"17040128\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"The erythrocyte-binding region of RH1 was identified within the N-terminal portion of the protein; antibodies raised against this functional binding region efficiently inhibit merozoite invasion.\",\n      \"method\": \"Erythrocyte binding assays with RH1 fragments, invasion inhibition assays with region-specific antibodies\",\n      \"journal\": \"PLoS pathogens\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct binding domain mapping combined with functional invasion inhibition, single lab, two orthogonal approaches\",\n      \"pmids\": [\"18617995\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"RH1 undergoes proteolytic processing events before and during erythrocyte invasion; the ectodomain is processed to produce fragments consistent with cleavage in the transmembrane domain, and processed fragments are released into the supernatant in a manner consistent with rhomboid protease cleavage. RH1 is also a component of the tight junction linking the erythrocyte to the actin-myosin motor during invasion.\",\n      \"method\": \"Immunoblot analysis of processing products, supernatant release assays, functional invasion assays\",\n      \"journal\": \"Cellular microbiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — biochemical processing analysis plus functional context, single lab, multiple approaches but no direct mutagenesis of cleavage sites\",\n      \"pmids\": [\"19614665\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Monoclonal antibodies against RH1 block merozoite invasion by specifically inhibiting calcium signalling in the parasite; this inhibition prevents EBA175 discharge and thus blocks formation of the tight junction between parasite and host cell. RH1 therefore functions upstream as a sensor and signal transducer that triggers calcium signalling leading to EBA175 release.\",\n      \"method\": \"Invasion inhibition assays with anti-RH1 monoclonal antibodies, calcium signalling measurements, EBA175 discharge assays\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal assays (invasion inhibition, Ca2+ signalling, EBA175 discharge) establishing a mechanistic pathway position for RH1, single lab but rigorous multi-method approach\",\n      \"pmids\": [\"24280897\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"RH1 binds to heparin; all tested members of the reticulocyte binding-like family bound heparin with diverse affinities, suggesting heparin masks the apical merozoite surface and blocks RH1-erythrocyte interaction.\",\n      \"method\": \"Heparin affinity chromatography fractionation, immunoblot with ligand-specific antibodies\",\n      \"journal\": \"Scientific reports\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 3 / Weak — single pulldown/affinity chromatography method, single lab, no functional mutagenesis of the binding site\",\n      \"pmids\": [\"24212193\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"The cytoplasmic tail domain (CTD) of RH1 promotes actin polymerization in vitro independently of aldolase, suggesting that RH1's CTD can directly recruit and stabilize actin filaments during motor assembly.\",\n      \"method\": \"Biolayer interferometry, co-sedimentation assays, in vitro actin polymerization assays with recombinant RH1 CTD\",\n      \"journal\": \"Molecular and biochemical parasitology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — in vitro biochemical reconstitution with purified components, single lab, two orthogonal methods (polymerization assay and sedimentation)\",\n      \"pmids\": [\"25261592\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"RH1 is differentially processed during merozoite maturation and invasion, generating distinct processing products with different functional roles; a subset of RH1 processing products form a close spatial association with micronemal protein AMA1 at the moving junction, as shown by in-situ Proximity Ligation and FRET assays, suggesting RH1 facilitates junction formation during active invasion.\",\n      \"method\": \"Monoclonal antibodies against different RH1 regions, in-situ Proximity Ligation Assay (PLA), FRET assays, immunofluorescence\",\n      \"journal\": \"Cellular microbiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — two nanometre-scale interaction assays (PLA and FRET) plus processing analysis, single lab, mechanistic placement at junction with AMA1\",\n      \"pmids\": [\"32452132\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"Loss of RH1 (gene disruption) substantially reduces susceptibility of P. falciparum to inhibitory antibodies from malaria-exposed individuals, demonstrating that RH1 is a significant target of naturally acquired invasion-inhibitory antibodies and that variation in RH1 expression contributes to immune evasion.\",\n      \"method\": \"Gene disruption (knockout) of pfrh1, invasion inhibition assays with human immune sera from Kenyan children and adults\",\n      \"journal\": \"Frontiers in immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — clean KO with defined immune-evasion phenotype, single study, functional readout with human sera\",\n      \"pmids\": [\"40201183\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    }\n  ],\n  \"current_model\": \"RH1 (PF3D7_0402300) is a P. falciparum merozoite apical protein that mediates sialic acid-dependent, trypsin-resistant erythrocyte invasion by binding a distinct erythrocyte surface receptor; upon host-cell contact it acts as a sensor/signal transducer that triggers parasite calcium signalling leading to EBA175 discharge and tight-junction formation, after which its ectodomain is proteolytically cleaved (likely by rhomboid proteases PfROM1/4) and released, while its cytoplasmic tail independently promotes actin polymerization, and a subset of its processing products associates closely with AMA1 at the moving junction to facilitate active invasion.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"RH1 (PF3D7_0402300) is a P. falciparum merozoite apical protein that directs the sialic acid-dependent, trypsin-resistant pathway of erythrocyte invasion by binding a distinct erythrocyte surface receptor [#0, #2]. It is expressed in late schizonts and merozoites and localizes to apical organelles and the apical surface, with the erythrocyte-binding activity residing in an N-terminal region whose region-specific antibodies inhibit invasion [#1, #4]. Beyond receptor engagement, RH1 acts upstream as a sensor and signal transducer: antibody blockade of RH1 inhibits parasite calcium signalling, preventing EBA175 discharge and tight-junction formation [#6]. During invasion RH1 is proteolytically processed, releasing ectodomain fragments in a manner consistent with transmembrane-domain cleavage by rhomboid proteases (PfROM4 and PfROM1 can cleave RH1 in vitro), and a subset of processing products associates closely with AMA1 at the moving junction [#3, #5, #9]. Its cytoplasmic tail domain independently promotes actin polymerization in vitro, linking RH1 to the invasion motor [#8]. RH1 is also a target of naturally acquired invasion-inhibitory antibodies, and variation in its expression contributes to immune evasion [#10].\",\n  \"teleology\": [\n    {\n      \"year\": 2001,\n      \"claim\": \"Established that RH1 engages a previously unrecognized erythrocyte receptor, defining a distinct sialic acid-dependent, trypsin-resistant entry route.\",\n      \"evidence\": \"Erythrocyte binding assays, antibody invasion inhibition, and analysis of truncated-RH1 strains on enzyme-treated cells\",\n      \"pmids\": [\"11733572\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"The molecular identity of the erythrocyte receptor was not defined\", \"No structural characterization of the binding interaction\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Placed RH1 protein temporally and spatially in the merozoite, showing apical organelle localization with strain-dependent trafficking differences.\",\n      \"evidence\": \"Immunofluorescence and expression analysis of late schizonts/merozoites across 3D7, T996, and FCB1 lines\",\n      \"pmids\": [\"12228308\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Functional consequence of mistargeting in 3D7/T996 not established\", \"Single lab, no complementation of trafficking defect\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"3D7\"}, {\"species\": \"Plasmodium falciparum\", \"strain\": \"T996\"}, {\"species\": \"Plasmodium falciparum\", \"strain\": \"FCB1\"}]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Demonstrated genetically that RH1 is required for sialic acid-dependent invasion and dictates receptor-usage pathway selection.\",\n      \"evidence\": \"Targeted gene disruption and invasion assays with neuraminidase-treated erythrocytes\",\n      \"pmids\": [\"15612925\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Does not identify the cognate receptor\", \"Redundancy with sibling family members not fully resolved\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Identified candidate proteases for RH1 shedding, showing PfROM4 and PfROM1 cleave RH1 in a transmembrane-domain-dependent manner.\",\n      \"evidence\": \"Heterologous rhomboid protease cleavage assay with transmembrane-domain swaps\",\n      \"pmids\": [\"17040128\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Cleavage shown in a heterologous system, not in the parasite\", \"In vivo protease responsible for RH1 shedding not confirmed\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Mapped the erythrocyte-binding activity to the N-terminal region and validated it as a functional, antibody-accessible invasion target.\",\n      \"evidence\": \"Erythrocyte binding assays with RH1 fragments and invasion inhibition with region-specific antibodies\",\n      \"pmids\": [\"18617995\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No high-resolution structure of the binding domain\", \"Receptor contact residues not defined\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Showed RH1 is proteolytically processed with ectodomain release before/during invasion and is a component of the tight junction linking erythrocyte to the actin-myosin motor.\",\n      \"evidence\": \"Immunoblot processing analysis, supernatant release assays, functional invasion assays\",\n      \"pmids\": [\"19614665\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Cleavage sites not defined by mutagenesis\", \"Direct protease identity in the parasite not established\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Positioned RH1 upstream in the invasion signalling cascade as a sensor that triggers calcium signalling to drive EBA175 discharge and junction formation.\",\n      \"evidence\": \"Anti-RH1 monoclonal antibody invasion inhibition, calcium signalling measurements, EBA175 discharge assays\",\n      \"pmids\": [\"24280897\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"The intracellular transduction pathway connecting RH1 engagement to calcium release is undefined\", \"How antibody binding blocks signalling mechanistically is unresolved\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Reported that RH1 binds heparin, raising the possibility that heparin masks the apical surface to block RH1-erythrocyte interaction.\",\n      \"evidence\": \"Heparin affinity chromatography fractionation and ligand-specific immunoblot\",\n      \"pmids\": [\"24212193\"],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"Single pulldown method with no functional mutagenesis of the binding site\", \"Physiological relevance of heparin binding not established\", \"Shared across the family, not RH1-specific\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Revealed a motor-linked function for the RH1 cytoplasmic tail, which promotes actin polymerization independently of aldolase.\",\n      \"evidence\": \"Biolayer interferometry, co-sedimentation, and in vitro actin polymerization assays with recombinant RH1 CTD\",\n      \"pmids\": [\"25261592\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Activity shown in vitro only, not in the parasite\", \"Direct binding partners of the CTD not identified\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Linked RH1 processing products to the moving junction by demonstrating a close spatial association with AMA1 during active invasion.\",\n      \"evidence\": \"Region-specific monoclonal antibodies with in-situ Proximity Ligation Assay, FRET, and immunofluorescence\",\n      \"pmids\": [\"32452132\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Whether the RH1-AMA1 proximity reflects a direct interaction is not established\", \"Functional requirement of the association for junction formation not tested\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Established RH1 as a target of naturally acquired invasion-inhibitory antibodies and a contributor to immune evasion via expression variation.\",\n      \"evidence\": \"pfrh1 gene disruption and invasion inhibition assays with human immune sera from Kenyan children and adults\",\n      \"pmids\": [\"40201183\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Specific epitopes recognized by natural antibodies not mapped\", \"Single study, contribution relative to other invasion antigens not quantified\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The molecular identity of the RH1 erythrocyte receptor and the intracellular machinery linking RH1 engagement to calcium signalling remain unknown.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Cognate erythrocyte receptor unidentified\", \"Signal transduction components downstream of RH1 undefined\", \"No parasite-confirmed protease or cleavage-site mapping\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0030246\", \"supporting_discovery_ids\": [0, 4, 7]},\n      {\"term_id\": \"GO:0051017\", \"supporting_discovery_ids\": [8]},\n      {\"term_id\": \"GO:0004930\", \"supporting_discovery_ids\": [6]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0020009\", \"supporting_discovery_ids\": [1]},\n      {\"term_id\": \"GO:0009986\", \"supporting_discovery_ids\": [1]},\n      {\"term_id\": \"GO:0020003\", \"supporting_discovery_ids\": [5, 9]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"GO:0044409\", \"supporting_discovery_ids\": [0, 2, 5]},\n      {\"term_id\": \"GO:0019722\", \"supporting_discovery_ids\": [6]}\n    ],\n    \"complexes\": [\n      \"Moving junction / tight junction complex associated with AMA1 [#5, #9]\"\n    ],\n    \"partners\": [\n      \"PfROM4 (protease that cleaves RH1) [#3]\",\n      \"PfROM1 (protease that cleaves RH1) [#3]\",\n      \"AMA1 (close spatial association at moving junction) [#9]\",\n      \"EBA175 (discharge downstream of RH1 signalling) [#6]\",\n      \"Actin (recruited/polymerized by RH1 cytoplasmic tail) [#8]\"\n    ],\n    \"other_free_text\": [\n      \"Binds a sialic acid-dependent, trypsin-resistant erythrocyte receptor distinct from known invasion receptors; receptor identity not defined [#0]\",\n      \"Erythrocyte-binding activity maps to the N-terminal region [#4]\",\n      \"Ectodomain is proteolytically processed and released, consistent with transmembrane-domain cleavage during invasion [#5]\",\n      \"Acts upstream as a sensor/signal transducer triggering parasite calcium signalling that drives EBA175 discharge [#6]\",\n      \"Target of naturally acquired invasion-inhibitory antibodies; expression variation contributes to immune evasion [#10]\"\n    ]\n  }\n}","audit_flag":null,"strains":[{"strain":"Pf3D7","gene_id":"PF3D7_0402300","name":null,"product":"reticulocyte binding protein homologue 1","uniprot_acc":null,"chromosome":null,"start_pos":null}],"gene_symbol":"RH1","evaluation":null}