{"gene":"PF3D7_0424100","run_date":"2026-09-07T10:55:51","timeline":{"discoveries":[{"year":2008,"finding":"RH5 (PF3D7_0424100) is expressed as a 63 kDa protein localized at the apical end (rhoptries) of P. falciparum merozoites, binds to a glycosylated receptor on the erythrocyte surface, and is essential for erythrocyte invasion; rabbit immune serum raised against its ecto-domain inhibits parasite invasion in vitro. RH5 lacks a transmembrane and cytosolic region, distinguishing it from other PfRh family members.","method":"Immunofluorescence localization, in vitro invasion inhibition assay with immune serum, genetic essentiality assessment","journal":"International journal for parasitology","confidence":"High","confidence_rationale":"Tier 2 / Strong — direct subcellular localization by imaging, in vitro functional assay with inhibitory serum, genetic essentiality demonstrated, replicated in subsequent studies","pmids":["19000690"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2008,"finding":"Polymorphisms in RH5 at specific residues (including position 204) determine whether P. falciparum can invade Aotus nancymaae erythrocytes; a proteolytic fragment of RH5 from infective parasites bound to A. nancymaae erythrocytes, establishing RH5 as a parasite ligand whose binding domain can be altered by amino acid substitutions to recognize different host erythrocyte surface receptors.","method":"Genetic cross linkage analysis, allelic replacement, erythrocyte binding assay with proteolytic RH5 fragment","journal":"Cell host & microbe","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — genetic cross with linkage mapping, allelic exchange mutagenesis, direct binding assay, multiple orthogonal methods","pmids":["18621009"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2011,"finding":"Basigin (Ok blood group antigen, CD147) is the erythrocyte receptor for RH5. Soluble basigin or anti-basigin antibodies potently block erythrocyte invasion by all tested P. falciparum strains. Ok(a−) erythrocytes expressing a basigin variant with lower affinity for RH5 show reduced invasion efficiency, establishing the RH5–basigin interaction as essential and universally required across strains.","method":"Systematic library screen of erythrocyte proteins (AVEXIS), surface plasmon resonance binding assay, basigin knockdown, blocking with soluble basigin and antibodies, Ok(a−) erythrocyte invasion assay","journal":"Nature","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — receptor identified by systematic screen, confirmed by multiple orthogonal methods (SPR, knockdown, antibody blockade, natural variant), replicated across labs","pmids":["22080952"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2011,"finding":"RH5 forms a complex with PfRipr (PFC1045c), a novel cysteine-rich EGF-domain-containing protein, in merozoites. RH5 is contained within rhoptries while PfRipr localises to micronemes; both are released during invasion and form a complex shed into culture supernatant. Antibodies against PfRipr potently inhibit merozoite attachment and invasion, indicating the RH5–PfRipr complex is essential for invasion.","method":"Ion-exchange chromatography, immunoprecipitation, mass spectrometry, immunofluorescence localization, in vitro invasion inhibition assay","journal":"PLoS pathogens","confidence":"High","confidence_rationale":"Tier 2 / Strong — complex identified by multiple biochemical methods (IP + MS), distinct subcellular localizations mapped, functional inhibition confirmed, replicated in subsequent studies","pmids":["21909261"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2013,"finding":"P. falciparum RH5 binds human basigin with high affinity but binds chimpanzee basigin with significantly lower affinity and does not bind gorilla basigin, mirroring the known host tropism of P. falciparum. Site-directed mutagenesis of basigin residues identified specific residues responsible for species specificity of RH5 binding, establishing the RH5–basigin interaction as a molecular determinant of P. falciparum host restriction to humans.","method":"Recombinant protein production, biophysical binding assays (SPR/AVEXIS), site-directed mutagenesis of basigin","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1 / Strong — quantitative binding assays with recombinant proteins, mutagenesis identifying key residues, functional outcome linked to host tropism","pmids":["24297912"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2014,"finding":"Crystal structure of RH5 (PF3D7_0424100) was determined at 2.18 Å resolution. RH5 adopts a novel fold comprising nine mostly anti-parallel α-helices encasing an N-terminal β-hairpin, with an overall elliptical disk shape. This is the first 3D structure of the PfRh protein family.","method":"X-ray crystallography (2.18 Å resolution)","journal":"eLife","confidence":"High","confidence_rationale":"Tier 1 / Strong — crystal structure at high resolution, structural fold independently confirmed by second crystal structure study","pmids":["25296023"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":"3D7"}]},{"year":2014,"finding":"Crystal structures of RH5 in complex with basigin and two distinct inhibitory antibodies were determined. RH5 adopts a kite-like architecture in which two three-helical bundles present binding sites for basigin and for inhibitory antibodies at one tip, defining the structural basis of receptor engagement and antibody neutralization.","method":"X-ray crystallography of RH5–basigin co-crystal and RH5–antibody Fab co-crystals","journal":"Nature","confidence":"High","confidence_rationale":"Tier 1 / Strong — co-crystal structures at atomic resolution with functional validation by antibody inhibition, independent confirmation of RH5 fold","pmids":["25132548"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2015,"finding":"RH5 forms a multiprotein complex (PfRH5/PfRipr/CyRPA) on the merozoite surface. CyRPA is a GPI-anchored protein that tethers the complex to the merozoite surface (since neither RH5 nor PfRipr have transmembrane domains or GPI anchors). Antibodies against each component co-immunoprecipitated the intact complex. CyRPA localizes to micronemes. Antibodies against CyRPA display potent strain-transcending invasion inhibition, and combined RH5 + CyRPA antibodies show synergistic invasion inhibition.","method":"Co-immunoprecipitation, GPI-anchor verification (PI-PLC treatment), immunofluorescence localization, in vitro invasion inhibition assay","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal co-IP of three-protein complex, GPI anchor confirmed biochemically, localization established, functional inhibition with multiple antibodies, independently replicated","pmids":["25583518"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2015,"finding":"The RH5–basigin binding step during invasion results in the formation of a pore or opening between the parasite and host cell, through which small molecules and possibly invasion components can flow. This step occurs after EBA/PfRh ligand-mediated strong erythrocyte deformation and before AMA1-RON2-mediated tight junction formation.","method":"Live cell imaging of invasion with systematic blockade of individual receptor-ligand pairs (genetic deletion, enzymatic treatment, inhibitory antibodies/peptides/small molecules)","journal":"PLoS pathogens","confidence":"High","confidence_rationale":"Tier 2 / Strong — live imaging with multiple orthogonal blocking approaches defines temporal sequence of RH5-basigin step and its morphological consequence","pmids":["25723550"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2016,"finding":"Conditional loss of function of PfRipr or CyRPA blocks P. falciparum erythrocyte invasion; super-resolution microscopy revealed that PfRipr, CyRPA, and RH5 colocalize at the junction between merozoites and erythrocytes during invasion. The RH5/PfRipr/CyRPA complex is required for triggering Ca²⁺ release and establishing the tight junction.","method":"Conditional knockdown lines (TetR-DOZI system), super-resolution microscopy, Ca²⁺ signaling assay","journal":"Cell host & microbe","confidence":"High","confidence_rationale":"Tier 2 / Strong — conditional loss-of-function with defined invasion phenotype, super-resolution colocalization, Ca²⁺ functional assay, multiple orthogonal methods in one study","pmids":["27374406"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2017,"finding":"P113, a merozoite surface protein, directly interacts with the conserved N-terminal region of RH5 (RH5Nt). This RH5Nt–P113 interaction provides a releasable anchoring mechanism for RH5 to the merozoite surface prior to invasion. The N-terminal region is cleaved from the native protein during processing.","method":"Recombinant protein production, AVEXIS protein interaction assay, binding interdependency mapping of RH5 complex components","journal":"Nature communications","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — sensitive protein interaction assay (AVEXIS) with recombinant proteins, single lab, binding interdependencies mapped but no in-parasite genetic validation reported in abstract","pmids":["28186186"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2017,"finding":"RH5–basigin interaction on its own triggers a Ca²⁺ signal in the erythrocyte, leading to phosphorylation changes in RBC cytoskeletal proteins and overall alterations in RBC cytoskeleton architecture. Antibodies blocking RH5 prevent this Ca²⁺ signal and invasion before tight junction formation.","method":"Ca²⁺ fluorescence assay in erythrocytes, phosphoproteomic analysis of RBC cytoskeletal proteins, invasion inhibition assay with anti-RH5 antibodies","journal":"Cellular microbiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — Ca²⁺ signaling and cytoskeletal phosphorylation measured with functional inhibition, single lab, moderate methods","pmids":["28409866"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2013,"finding":"Vaccine-induced polyclonal anti-RH5 antibodies inhibit tight attachment of merozoites to erythrocytes and block the RH5–basigin interaction. Monoclonal antibody analysis showed: (1) blocking the RH5–basigin interaction in vitro is predictive of functional neutralization; (2) neutralizing mAbs bind spatially related epitopes involving at least two defined regions of RH5 primary sequence; (3) intact bivalent IgG contributes to but is not necessary for parasite neutralization.","method":"In vitro invasion inhibition assay, ELISA-based RH5–basigin blocking assay, monoclonal antibody epitope mapping","journal":"Journal of immunology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple functional assays and epitope mapping with mAbs, single lab, mechanistically informative about antibody mechanism of action","pmids":["24293631"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2018,"finding":"Cryo-EM structure of the trimeric Rh5–CyRPA–Ripr (RCR) complex was determined at subnanometre resolution. CyRPA is a critical mediator of complex assembly with blades 4–6 of its β-propeller forming contact sites for both Rh5 and Ripr. The complex binds erythrocyte cell line JK-1 significantly better than Rh5 alone, and this binding occurs through insertion of Rh5 and Ripr into host membranes as a high-molecular-weight complex. Comparison with the Rh5–basigin crystal structure suggests Rh5 and Ripr are positioned parallel to the erythrocyte membrane before membrane insertion.","method":"Cryo-electron microscopy (subnanometre resolution), erythrocyte binding assay, high-molecular-weight complex membrane insertion analysis","journal":"Nature","confidence":"High","confidence_rationale":"Tier 1 / Strong — cryo-EM structure plus functional binding assay, multiple orthogonal approaches in one study, published in high-impact journal","pmids":["30542156"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2019,"finding":"A subset of human anti-RH5 monoclonal antibodies that are non-neutralizing reduce the speed of red blood cell invasion by the merozoite (slowing invasion without blocking it), and these 'invasion-slowing' antibodies potentiate the effect of all neutralizing RH5 antibodies as well as synergize with antibodies targeting other malaria invasion proteins. Neutralizing mAbs bind three distinct sites on RH5.","method":"Human mAb isolation from vaccinees, live-imaging invasion speed assay, in vitro growth inhibition assay, epitope mapping","journal":"Cell","confidence":"High","confidence_rationale":"Tier 2 / Strong — panel of human mAbs characterized by multiple orthogonal methods including live imaging and GIA, mechanistically defines non-neutralizing potentiator class","pmids":["31204103"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2019,"finding":"Using passive transfer of neutralizing (c2AC7) versus non-neutralizing (c4BA7) anti-RH5 chimeric monoclonal antibodies with Fc mutations eliminating complement and FcR engagement into Aotus nancymaae monkeys challenged with P. falciparum, the neutralizing RH5-binding mAb conferred complete protection (6/6 animals) whereas non-neutralizing RH5-binding mAb conferred no protection (0/6), establishing that merozoite-neutralizing antibody against RH5 is a mechanistic correlate of protection.","method":"Passive transfer of engineered chimeric mAbs, P. falciparum blood-stage challenge in Aotus monkeys","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 2 / Strong — controlled passive transfer with isotype-matched non-neutralizing control and Fc-engineered mAbs, clean in vivo mechanistic test","pmids":["31028254"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2019,"finding":"RH5 is restricted to the Laverania subgenus (including P. falciparum) and is absent in non-Laverania species such as P. knowlesi and P. vivax. In P. knowlesi, CyRPA and RIPR are each essential for erythrocyte invasion but neither forms a complex with each other nor with an RH5-like molecule (PkRIPR is part of a different trimeric complex; PkCyRPA functions without other parasite binding partners), demonstrating that RH5 defines a distinct invasion mechanism specific to Laverania.","method":"Conditional knockdown in P. knowlesi and P. vivax, co-immunoprecipitation to assess complex formation","journal":"PLoS pathogens","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — conditional knockdown phenotype plus co-IP for complex composition, comparative across species, single lab","pmids":["31185066"],"is_preprint":false,"attribution":[{"species":"Plasmodium knowlesi","strain":""},{"species":"Plasmodium vivax","strain":""}]},{"year":2019,"finding":"The ancestral introgressed RH5 sequence (resurrected computationally and expressed recombinantly) bound basigin from both humans and gorillas, whereas current P. falciparum RH5 binds only human basigin. A single amino acid mutation in RH5 is responsible for the subsequent restriction to human basigin specificity after the zoonotic transfer.","method":"Ancestral sequence resurrection, recombinant protein expression, quantitative protein interaction assays (SPR/AVEXIS), site-directed mutagenesis","journal":"PLoS biology","confidence":"High","confidence_rationale":"Tier 1 / Strong — ancestral protein resurrection with quantitative binding assays and mutagenesis identifying single causal residue, multiple orthogonal approaches","pmids":["31613878"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2022,"finding":"RH5, CyRPA, and RIPR (RCR complex) are bound by a heteromeric disulfide-linked PfPTRAMP–PfCSS complex to form a pentameric PCRCR complex. Conditional knockouts of PfPTRAMP and PfCSS, invasion inhibitory nanobodies against both, and lattice light-sheet microscopy show these components are essential for merozoite invasion. The PCRCR complex functions to anchor contact between merozoite and erythrocyte membranes brought together by parasite deformations.","method":"Conditional knockout (P. falciparum), nanobody invasion inhibition, lattice light-sheet microscopy, cryo-EM structure of nanobody–PfCSS complexes","journal":"Nature microbiology","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — conditional KO with defined invasion phenotype, structural data, nanobody inhibition, live microscopy, multiple orthogonal methods","pmids":["36396942"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2023,"finding":"Cryo-EM structure of the PfRCR complex (RH5–CyRPA–RIPR) was determined, showing that RIPR consists of an ordered multidomain core flexibly linked to an elongated tail. The elongated tail of RIPR binds to the PfCSS–PfPTRAMP complex on the parasite membrane, while the structured core presents CyRPA and RH5 to erythrocyte receptors. RH5 with a rigid, disulfide-locked conformation can mediate efficient erythrocyte invasion, arguing against the previous model of RH5 opening to insert into the membrane. CyRPA-binding antibodies neutralize invasion through a steric mechanism.","method":"Cryo-EM structure determination, disulfide-locked RH5 functional assay, erythrocyte binding assay, modelling of PCRCR complex","journal":"Nature","confidence":"High","confidence_rationale":"Tier 1 / Strong — cryo-EM structure with functional validation of disulfide-locked RH5, mechanistic model tested directly, published in Nature","pmids":["38123677"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2013,"finding":"Various RH5 allelic polymorphisms at positions 204, 347, 358, 362, 410, and 429 introduced by allelic replacement into the non-virulent 7G8 P. falciparum line determine invasion competence into A. nancymaae and rat erythrocytes; polymorphisms at position 204 (204K or 204R) also confer rat erythrocyte invasion with differential neuraminidase sensitivity, defining the RH5 receptor-binding domain region.","method":"Allelic replacement mutagenesis, invasion assays into primate and rodent erythrocytes, neuraminidase treatment","journal":"Molecular and biochemical parasitology","confidence":"High","confidence_rationale":"Tier 1 / Strong — systematic allelic replacement at multiple codons with invasion phenotype readout, multiple independent transformants tested","pmids":["23305874"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":"7G8"}]},{"year":2017,"finding":"CRISPR/Cas9 knockout of basigin (BSG) in JK-1 erythroleukemia-derived RBCs completely blocks P. falciparum invasion in a strain-transcendent manner, confirming the essential and universal role of the BSG–RH5 interaction for erythrocyte invasion across all tested strains.","method":"CRISPR/Cas9 gene knockout in immortal JK-1 erythroleukemia line, multi-strain P. falciparum invasion assay","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean genetic knockout with defined invasion phenotype, multiple parasite strains tested, replicates prior knockdown data with cleaner genetic tool","pmids":["29078358"],"is_preprint":false,"attribution":[{"species":"Plasmodium falciparum","strain":""}]}],"current_model":"P. falciparum RH5 (PF3D7_0424100) is a small, rhoptry-localized merozoite ligand that is released during invasion to form an essential pentameric PCRCR complex (with PfRipr, PfCyRPA, PfCSS, and PfPTRAMP); within this complex, RH5 adopts a kite-shaped helical fold and binds the erythrocyte receptor basigin at one tip, an interaction that is universally required across all P. falciparum strains, triggers Ca²⁺ signaling and cytoskeletal rearrangement in the erythrocyte, produces a transient pore at the merozoite–erythrocyte interface, and is anchored to the merozoite surface prior to invasion via an interaction between its cleaved N-terminal region and the surface protein P113."},"narrative":{"mechanistic_narrative":"RH5 (PF3D7_0424100) is an essential, rhoptry-localized merozoite ligand of P. falciparum that mediates a universally required step of erythrocyte invasion by engaging the host receptor basigin [PMID:19000690, PMID:22080952]. RH5 is unusual among the PfRh family in lacking transmembrane and cytosolic regions [PMID:19000690]; it adopts a novel kite-shaped fold of nine mostly anti-parallel α-helices encasing an N-terminal β-hairpin, presenting the basigin-binding surface and inhibitory-antibody epitopes at one tip [PMID:25296023, PMID:25132548]. RH5 binding to basigin is essential and strain-transcending, established by soluble-basigin and antibody blockade, a low-affinity natural Ok(a−) variant, and CRISPR knockout of basigin that abolishes invasion by all tested strains [PMID:22080952, PMID:29078358]. This interaction is a molecular determinant of host tropism: RH5 binds human basigin with high affinity but chimpanzee basigin weakly and gorilla basigin not at all, and a single residue acquired after zoonotic transfer restricted the ancestral broadly-binding RH5 to human basigin [PMID:24297912, PMID:31613878]. Functionally, the RH5–basigin engagement triggers a Ca²⁺ signal in the erythrocyte with cytoskeletal phosphorylation changes, produces a transient pore/opening at the merozoite–erythrocyte interface, and acts after strong deformation but before AMA1-RON2 tight-junction formation [PMID:25723550, PMID:27374406, PMID:28409866]. RH5 does not function alone: it assembles with PfRipr and the GPI-anchored CyRPA into a surface-tethered RCR complex, which is further bound by a disulfide-linked PfPTRAMP–PfCSS pair to form the pentameric PCRCR complex that anchors merozoite–erythrocyte membrane contact [PMID:21909261, PMID:25583518, PMID:30542156, PMID:36396942, PMID:38123677]. Prior to invasion RH5 is anchored to the merozoite surface via its cleaved conserved N-terminal region binding the surface protein P113 [PMID:28186186]. RH5 defines a Laverania-specific invasion mechanism, being absent from P. knowlesi and P. vivax where CyRPA and RIPR act in distinct complexes [PMID:31185066]. Neutralizing anti-RH5 antibodies that block basigin binding are a mechanistic correlate of protection in vivo, and a class of non-neutralizing 'invasion-slowing' antibodies potentiates them [PMID:24293631, PMID:31204103, PMID:31028254].","teleology":[{"year":2008,"claim":"Establishing RH5 as an essential apical merozoite ligand answered whether this atypical PfRh member participates in invasion at all and where it acts.","evidence":"Immunofluorescence rhoptry localization, inhibitory immune serum in invasion assays, and essentiality assessment in P. falciparum; genetic cross and allelic replacement linking RH5 polymorphisms to host erythrocyte range","pmids":["19000690","18621009"],"confidence":"High","gaps":["Erythrocyte receptor not yet identified","Molecular basis of the polymorphism-driven binding change unresolved"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2011,"claim":"Identifying basigin as the RH5 receptor and PfRipr as a binding partner answered what host molecule RH5 engages and revealed that RH5 acts within a parasite complex.","evidence":"AVEXIS library screen, SPR, basigin knockdown/antibody blockade and Ok(a−) invasion assays; ion-exchange/IP-MS identifying the RH5–PfRipr complex with distinct organellar origins in P. falciparum","pmids":["22080952","21909261"],"confidence":"High","gaps":["How the complex is tethered to the membrane-anchorless RH5 unknown","Downstream signalling consequence of binding not defined"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2013,"claim":"Quantifying RH5 affinity for basigin across great-ape species and mapping the receptor-binding region tied the RH5–basigin interaction to P. falciparum host restriction and located the binding determinants.","evidence":"Recombinant binding assays with human/chimp/gorilla basigin plus basigin mutagenesis; allelic replacement at multiple RH5 codons scoring primate/rodent invasion; anti-RH5 vaccine antibody blocking and mAb epitope mapping in P. falciparum","pmids":["24297912","23305874","24293631"],"confidence":"High","gaps":["Structural basis of binding not yet solved","In-parasite role of specific residues on human basigin binding indirect"],"attribution":[{"species":"Plasmodium falciparum","strain":"7G8"},{"species":"Plasmodium falciparum","strain":""}]},{"year":2014,"claim":"Solving the RH5 fold and its complex with basigin and inhibitory antibodies answered how RH5 is built and how it engages receptor and is neutralized.","evidence":"X-ray crystallography of RH5 alone (2.18 Å) and co-crystals of RH5 with basigin and inhibitory Fabs from P. falciparum 3D7 and other isolates","pmids":["25296023","25132548"],"confidence":"High","gaps":["Structure of the full multiprotein complex not resolved","Mechanism linking binding to downstream invasion steps unknown"],"attribution":[{"species":"Plasmodium falciparum","strain":"3D7"},{"species":"Plasmodium falciparum","strain":""}]},{"year":2015,"claim":"Defining the trimeric RH5–PfRipr–CyRPA complex and placing the RH5–basigin step in the invasion sequence answered how the anchorless RH5 is surface-tethered and what its engagement accomplishes mechanically.","evidence":"Reciprocal co-IP with GPI-anchor verification of CyRPA; live-cell imaging with staged receptor-ligand blockade defining pore formation after deformation and before tight junction in P. falciparum","pmids":["25583518","25723550"],"confidence":"High","gaps":["Molecular nature of the pore unresolved","Signalling trigger downstream of pore not identified"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2016,"claim":"Conditional loss-of-function and junctional colocalization tied the RCR complex to Ca²⁺ release and tight-junction formation, establishing its indispensability at the invasion interface.","evidence":"TetR-DOZI conditional knockdown of PfRipr/CyRPA, super-resolution colocalization with RH5, and Ca²⁺ signalling assays in P. falciparum","pmids":["27374406"],"confidence":"High","gaps":["Direct mechanistic link from RH5–basigin binding to Ca²⁺ release not fully dissected"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2017,"claim":"Identifying the RH5 N-terminus–P113 interaction and showing RH5–basigin alone triggers erythrocyte Ca²⁺ signalling answered how RH5 is pre-anchored and confirmed its receptor engagement is a host-signalling event; CRISPR basigin knockout cemented the interaction's universal essentiality.","evidence":"AVEXIS interaction mapping of RH5Nt–P113; erythrocyte Ca²⁺ fluorescence and cytoskeletal phosphoproteomics with anti-RH5 blockade; CRISPR/Cas9 basigin knockout in JK-1 cells across strains (P. falciparum)","pmids":["28186186","28409866","29078358"],"confidence":"Medium","gaps":["RH5Nt–P113 interaction lacks in-parasite genetic validation in the timeline","Ca²⁺ signalling pathway components in erythrocyte not identified"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2018,"claim":"The cryo-EM RCR structure answered how CyRPA assembles the complex and proposed that RH5 and Ripr insert into the host membrane, refining the invasion mechanism.","evidence":"Cryo-EM at subnanometre resolution, JK-1 erythrocyte binding assays, and high-molecular-weight membrane-insertion analysis in P. falciparum","pmids":["30542156"],"confidence":"High","gaps":["Membrane-insertion model later challenged","Full pentameric assembly not yet captured"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2019,"claim":"Functional dissection of anti-RH5 antibodies and species-comparative and ancestral-resurrection work established RH5-neutralizing antibody as a correlate of protection, defined a potentiator antibody class, and traced host-specificity evolution to a single residue.","evidence":"Passive transfer of Fc-null neutralizing vs non-neutralizing mAbs in Aotus; human mAb panels with live-imaging invasion-speed and GIA assays; conditional knockdown/co-IP in P. knowlesi and P. vivax; ancestral RH5 resurrection with SPR/AVEXIS and mutagenesis","pmids":["31028254","31204103","31185066","31613878"],"confidence":"High","gaps":["Mechanism of invasion-slowing potentiation at molecular level not fully defined","Species-divergence findings rest on single-lab comparative data"],"attribution":[{"species":"Plasmodium falciparum","strain":""},{"species":"Plasmodium knowlesi","strain":""},{"species":"Plasmodium vivax","strain":""}]},{"year":2022,"claim":"Discovery of the pentameric PCRCR complex answered how the RCR complex is connected to the merozoite membrane and defined its role in anchoring membrane contact.","evidence":"Conditional knockouts of PfPTRAMP and PfCSS, invasion-inhibitory nanobodies, lattice light-sheet microscopy, and cryo-EM of nanobody–PfCSS complexes in P. falciparum","pmids":["36396942"],"confidence":"High","gaps":["Full-length assembled PCRCR structure not solved in this study","Precise geometry of RH5 within the pentamer during contact unresolved"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":2023,"claim":"The cryo-EM PfRCR structure revised the invasion model, showing a disulfide-locked rigid RH5 can still mediate invasion, arguing against RH5 membrane-insertion via conformational opening.","evidence":"Cryo-EM of the RH5–CyRPA–RIPR complex, disulfide-locked RH5 functional invasion assays, and PCRCR modelling in P. falciparum","pmids":["38123677"],"confidence":"High","gaps":["Exact molecular event coupling RH5 receptor binding to pore/signalling still not defined","Structure of the fully assembled membrane-engaged pentamer not captured"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]},{"year":null,"claim":"How RH5–basigin engagement is mechanistically transduced into erythrocyte Ca²⁺ release, cytoskeletal remodelling, and pore formation remains the central unresolved question.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No molecular identity for the transient pore","Host signalling machinery downstream of RH5 binding unidentified","In-parasite validation of RH5Nt–P113 anchoring not reported in the corpus"],"attribution":[{"species":"Plasmodium falciparum","strain":""}]}],"mechanism_profile":{"molecular_activity":[],"localization":[],"pathway":[],"complexes":["RH5–PfRipr complex [#3]","RH5–CyRPA–PfRipr (RCR) trimeric complex [#7, #13, #19]","PfPTRAMP–PfCSS–RH5–CyRPA–PfRipr pentameric PCRCR complex [#18, #19]"],"partners":["BASIGIN / CD147 (OK BLOOD GROUP) — ERYTHROCYTE RECEPTOR [#2, #4, #17, #21]","PFRIPR [#3, #13, #19]","CYRPA (GPI-ANCHORED COMPLEX TETHER) [#7, #13, #19]","P113 (MEROZOITE SURFACE ANCHOR FOR RH5 N-TERMINUS) [#10]","PFPTRAMP [#18, #19]","PFCSS [#18, #19]"],"other_free_text":["RH5 lacks transmembrane and cytosolic regions, unlike other PfRh family members [#0]","Adopts a novel kite-shaped fold of nine mostly anti-parallel α-helices encasing an N-terminal β-hairpin [#5, #6]","RH5–basigin binding triggers erythrocyte Ca²⁺ signalling and cytoskeletal phosphorylation changes, and produces a transient pore acting after deformation and before AMA1-RON2 tight junction [#8, #9, #11]","N-terminal region is cleaved during processing [#10]","RH5 is restricted to the Laverania subgenus and absent from P. knowlesi and P. vivax [#16]","Neutralizing anti-RH5 antibody blocking basigin binding is a mechanistic correlate of protection in Aotus [#12, #15]","Non-neutralizing 'invasion-slowing' anti-RH5 antibodies potentiate neutralizing antibodies [#14]","A disulfide-locked rigid RH5 mediates efficient invasion, arguing against a membrane-insertion opening model [#19]"]}},"prefetch_data":{},"corpus_meta":[{"pmid":"22080952","id":"PMC_22080952","title":"Basigin is a receptor essential for erythrocyte invasion by Plasmodium 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erythrocyte invasion; rabbit immune serum raised against its ecto-domain inhibits parasite invasion in vitro. RH5 lacks a transmembrane and cytosolic region, distinguishing it from other PfRh family members.\",\n      \"method\": \"Immunofluorescence localization, in vitro invasion inhibition assay with immune serum, genetic essentiality assessment\",\n      \"journal\": \"International journal for parasitology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — direct subcellular localization by imaging, in vitro functional assay with inhibitory serum, genetic essentiality demonstrated, replicated in subsequent studies\",\n      \"pmids\": [\"19000690\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Polymorphisms in RH5 at specific residues (including position 204) determine whether P. falciparum can invade Aotus nancymaae erythrocytes; a proteolytic fragment of RH5 from infective parasites bound to A. nancymaae erythrocytes, establishing RH5 as a parasite ligand whose binding domain can be altered by amino acid substitutions to recognize different host erythrocyte surface receptors.\",\n      \"method\": \"Genetic cross linkage analysis, allelic replacement, erythrocyte binding assay with proteolytic RH5 fragment\",\n      \"journal\": \"Cell host & microbe\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — genetic cross with linkage mapping, allelic exchange mutagenesis, direct binding assay, multiple orthogonal methods\",\n      \"pmids\": [\"18621009\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"Basigin (Ok blood group antigen, CD147) is the erythrocyte receptor for RH5. Soluble basigin or anti-basigin antibodies potently block erythrocyte invasion by all tested P. falciparum strains. Ok(a−) erythrocytes expressing a basigin variant with lower affinity for RH5 show reduced invasion efficiency, establishing the RH5–basigin interaction as essential and universally required across strains.\",\n      \"method\": \"Systematic library screen of erythrocyte proteins (AVEXIS), surface plasmon resonance binding assay, basigin knockdown, blocking with soluble basigin and antibodies, Ok(a−) erythrocyte invasion assay\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — receptor identified by systematic screen, confirmed by multiple orthogonal methods (SPR, knockdown, antibody blockade, natural variant), replicated across labs\",\n      \"pmids\": [\"22080952\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2011,\n      \"finding\": \"RH5 forms a complex with PfRipr (PFC1045c), a novel cysteine-rich EGF-domain-containing protein, in merozoites. RH5 is contained within rhoptries while PfRipr localises to micronemes; both are released during invasion and form a complex shed into culture supernatant. Antibodies against PfRipr potently inhibit merozoite attachment and invasion, indicating the RH5–PfRipr complex is essential for invasion.\",\n      \"method\": \"Ion-exchange chromatography, immunoprecipitation, mass spectrometry, immunofluorescence localization, in vitro invasion inhibition assay\",\n      \"journal\": \"PLoS pathogens\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — complex identified by multiple biochemical methods (IP + MS), distinct subcellular localizations mapped, functional inhibition confirmed, replicated in subsequent studies\",\n      \"pmids\": [\"21909261\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"P. falciparum RH5 binds human basigin with high affinity but binds chimpanzee basigin with significantly lower affinity and does not bind gorilla basigin, mirroring the known host tropism of P. falciparum. Site-directed mutagenesis of basigin residues identified specific residues responsible for species specificity of RH5 binding, establishing the RH5–basigin interaction as a molecular determinant of P. falciparum host restriction to humans.\",\n      \"method\": \"Recombinant protein production, biophysical binding assays (SPR/AVEXIS), site-directed mutagenesis of basigin\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — quantitative binding assays with recombinant proteins, mutagenesis identifying key residues, functional outcome linked to host tropism\",\n      \"pmids\": [\"24297912\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Crystal structure of RH5 (PF3D7_0424100) was determined at 2.18 Å resolution. RH5 adopts a novel fold comprising nine mostly anti-parallel α-helices encasing an N-terminal β-hairpin, with an overall elliptical disk shape. This is the first 3D structure of the PfRh protein family.\",\n      \"method\": \"X-ray crystallography (2.18 Å resolution)\",\n      \"journal\": \"eLife\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crystal structure at high resolution, structural fold independently confirmed by second crystal structure study\",\n      \"pmids\": [\"25296023\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"3D7\"}]\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Crystal structures of RH5 in complex with basigin and two distinct inhibitory antibodies were determined. RH5 adopts a kite-like architecture in which two three-helical bundles present binding sites for basigin and for inhibitory antibodies at one tip, defining the structural basis of receptor engagement and antibody neutralization.\",\n      \"method\": \"X-ray crystallography of RH5–basigin co-crystal and RH5–antibody Fab co-crystals\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — co-crystal structures at atomic resolution with functional validation by antibody inhibition, independent confirmation of RH5 fold\",\n      \"pmids\": [\"25132548\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"RH5 forms a multiprotein complex (PfRH5/PfRipr/CyRPA) on the merozoite surface. CyRPA is a GPI-anchored protein that tethers the complex to the merozoite surface (since neither RH5 nor PfRipr have transmembrane domains or GPI anchors). Antibodies against each component co-immunoprecipitated the intact complex. CyRPA localizes to micronemes. Antibodies against CyRPA display potent strain-transcending invasion inhibition, and combined RH5 + CyRPA antibodies show synergistic invasion inhibition.\",\n      \"method\": \"Co-immunoprecipitation, GPI-anchor verification (PI-PLC treatment), immunofluorescence localization, in vitro invasion inhibition assay\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal co-IP of three-protein complex, GPI anchor confirmed biochemically, localization established, functional inhibition with multiple antibodies, independently replicated\",\n      \"pmids\": [\"25583518\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"The RH5–basigin binding step during invasion results in the formation of a pore or opening between the parasite and host cell, through which small molecules and possibly invasion components can flow. This step occurs after EBA/PfRh ligand-mediated strong erythrocyte deformation and before AMA1-RON2-mediated tight junction formation.\",\n      \"method\": \"Live cell imaging of invasion with systematic blockade of individual receptor-ligand pairs (genetic deletion, enzymatic treatment, inhibitory antibodies/peptides/small molecules)\",\n      \"journal\": \"PLoS pathogens\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — live imaging with multiple orthogonal blocking approaches defines temporal sequence of RH5-basigin step and its morphological consequence\",\n      \"pmids\": [\"25723550\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Conditional loss of function of PfRipr or CyRPA blocks P. falciparum erythrocyte invasion; super-resolution microscopy revealed that PfRipr, CyRPA, and RH5 colocalize at the junction between merozoites and erythrocytes during invasion. The RH5/PfRipr/CyRPA complex is required for triggering Ca²⁺ release and establishing the tight junction.\",\n      \"method\": \"Conditional knockdown lines (TetR-DOZI system), super-resolution microscopy, Ca²⁺ signaling assay\",\n      \"journal\": \"Cell host & microbe\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — conditional loss-of-function with defined invasion phenotype, super-resolution colocalization, Ca²⁺ functional assay, multiple orthogonal methods in one study\",\n      \"pmids\": [\"27374406\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"P113, a merozoite surface protein, directly interacts with the conserved N-terminal region of RH5 (RH5Nt). This RH5Nt–P113 interaction provides a releasable anchoring mechanism for RH5 to the merozoite surface prior to invasion. The N-terminal region is cleaved from the native protein during processing.\",\n      \"method\": \"Recombinant protein production, AVEXIS protein interaction assay, binding interdependency mapping of RH5 complex components\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — sensitive protein interaction assay (AVEXIS) with recombinant proteins, single lab, binding interdependencies mapped but no in-parasite genetic validation reported in abstract\",\n      \"pmids\": [\"28186186\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"RH5–basigin interaction on its own triggers a Ca²⁺ signal in the erythrocyte, leading to phosphorylation changes in RBC cytoskeletal proteins and overall alterations in RBC cytoskeleton architecture. Antibodies blocking RH5 prevent this Ca²⁺ signal and invasion before tight junction formation.\",\n      \"method\": \"Ca²⁺ fluorescence assay in erythrocytes, phosphoproteomic analysis of RBC cytoskeletal proteins, invasion inhibition assay with anti-RH5 antibodies\",\n      \"journal\": \"Cellular microbiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — Ca²⁺ signaling and cytoskeletal phosphorylation measured with functional inhibition, single lab, moderate methods\",\n      \"pmids\": [\"28409866\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Vaccine-induced polyclonal anti-RH5 antibodies inhibit tight attachment of merozoites to erythrocytes and block the RH5–basigin interaction. Monoclonal antibody analysis showed: (1) blocking the RH5–basigin interaction in vitro is predictive of functional neutralization; (2) neutralizing mAbs bind spatially related epitopes involving at least two defined regions of RH5 primary sequence; (3) intact bivalent IgG contributes to but is not necessary for parasite neutralization.\",\n      \"method\": \"In vitro invasion inhibition assay, ELISA-based RH5–basigin blocking assay, monoclonal antibody epitope mapping\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple functional assays and epitope mapping with mAbs, single lab, mechanistically informative about antibody mechanism of action\",\n      \"pmids\": [\"24293631\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Cryo-EM structure of the trimeric Rh5–CyRPA–Ripr (RCR) complex was determined at subnanometre resolution. CyRPA is a critical mediator of complex assembly with blades 4–6 of its β-propeller forming contact sites for both Rh5 and Ripr. The complex binds erythrocyte cell line JK-1 significantly better than Rh5 alone, and this binding occurs through insertion of Rh5 and Ripr into host membranes as a high-molecular-weight complex. Comparison with the Rh5–basigin crystal structure suggests Rh5 and Ripr are positioned parallel to the erythrocyte membrane before membrane insertion.\",\n      \"method\": \"Cryo-electron microscopy (subnanometre resolution), erythrocyte binding assay, high-molecular-weight complex membrane insertion analysis\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — cryo-EM structure plus functional binding assay, multiple orthogonal approaches in one study, published in high-impact journal\",\n      \"pmids\": [\"30542156\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"A subset of human anti-RH5 monoclonal antibodies that are non-neutralizing reduce the speed of red blood cell invasion by the merozoite (slowing invasion without blocking it), and these 'invasion-slowing' antibodies potentiate the effect of all neutralizing RH5 antibodies as well as synergize with antibodies targeting other malaria invasion proteins. Neutralizing mAbs bind three distinct sites on RH5.\",\n      \"method\": \"Human mAb isolation from vaccinees, live-imaging invasion speed assay, in vitro growth inhibition assay, epitope mapping\",\n      \"journal\": \"Cell\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — panel of human mAbs characterized by multiple orthogonal methods including live imaging and GIA, mechanistically defines non-neutralizing potentiator class\",\n      \"pmids\": [\"31204103\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Using passive transfer of neutralizing (c2AC7) versus non-neutralizing (c4BA7) anti-RH5 chimeric monoclonal antibodies with Fc mutations eliminating complement and FcR engagement into Aotus nancymaae monkeys challenged with P. falciparum, the neutralizing RH5-binding mAb conferred complete protection (6/6 animals) whereas non-neutralizing RH5-binding mAb conferred no protection (0/6), establishing that merozoite-neutralizing antibody against RH5 is a mechanistic correlate of protection.\",\n      \"method\": \"Passive transfer of engineered chimeric mAbs, P. falciparum blood-stage challenge in Aotus monkeys\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — controlled passive transfer with isotype-matched non-neutralizing control and Fc-engineered mAbs, clean in vivo mechanistic test\",\n      \"pmids\": [\"31028254\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"RH5 is restricted to the Laverania subgenus (including P. falciparum) and is absent in non-Laverania species such as P. knowlesi and P. vivax. In P. knowlesi, CyRPA and RIPR are each essential for erythrocyte invasion but neither forms a complex with each other nor with an RH5-like molecule (PkRIPR is part of a different trimeric complex; PkCyRPA functions without other parasite binding partners), demonstrating that RH5 defines a distinct invasion mechanism specific to Laverania.\",\n      \"method\": \"Conditional knockdown in P. knowlesi and P. vivax, co-immunoprecipitation to assess complex formation\",\n      \"journal\": \"PLoS pathogens\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — conditional knockdown phenotype plus co-IP for complex composition, comparative across species, single lab\",\n      \"pmids\": [\"31185066\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium knowlesi\", \"strain\": \"\"}, {\"species\": \"Plasmodium vivax\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"The ancestral introgressed RH5 sequence (resurrected computationally and expressed recombinantly) bound basigin from both humans and gorillas, whereas current P. falciparum RH5 binds only human basigin. A single amino acid mutation in RH5 is responsible for the subsequent restriction to human basigin specificity after the zoonotic transfer.\",\n      \"method\": \"Ancestral sequence resurrection, recombinant protein expression, quantitative protein interaction assays (SPR/AVEXIS), site-directed mutagenesis\",\n      \"journal\": \"PLoS biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — ancestral protein resurrection with quantitative binding assays and mutagenesis identifying single causal residue, multiple orthogonal approaches\",\n      \"pmids\": [\"31613878\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"RH5, CyRPA, and RIPR (RCR complex) are bound by a heteromeric disulfide-linked PfPTRAMP–PfCSS complex to form a pentameric PCRCR complex. Conditional knockouts of PfPTRAMP and PfCSS, invasion inhibitory nanobodies against both, and lattice light-sheet microscopy show these components are essential for merozoite invasion. The PCRCR complex functions to anchor contact between merozoite and erythrocyte membranes brought together by parasite deformations.\",\n      \"method\": \"Conditional knockout (P. falciparum), nanobody invasion inhibition, lattice light-sheet microscopy, cryo-EM structure of nanobody–PfCSS complexes\",\n      \"journal\": \"Nature microbiology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — conditional KO with defined invasion phenotype, structural data, nanobody inhibition, live microscopy, multiple orthogonal methods\",\n      \"pmids\": [\"36396942\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Cryo-EM structure of the PfRCR complex (RH5–CyRPA–RIPR) was determined, showing that RIPR consists of an ordered multidomain core flexibly linked to an elongated tail. The elongated tail of RIPR binds to the PfCSS–PfPTRAMP complex on the parasite membrane, while the structured core presents CyRPA and RH5 to erythrocyte receptors. RH5 with a rigid, disulfide-locked conformation can mediate efficient erythrocyte invasion, arguing against the previous model of RH5 opening to insert into the membrane. CyRPA-binding antibodies neutralize invasion through a steric mechanism.\",\n      \"method\": \"Cryo-EM structure determination, disulfide-locked RH5 functional assay, erythrocyte binding assay, modelling of PCRCR complex\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — cryo-EM structure with functional validation of disulfide-locked RH5, mechanistic model tested directly, published in Nature\",\n      \"pmids\": [\"38123677\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Various RH5 allelic polymorphisms at positions 204, 347, 358, 362, 410, and 429 introduced by allelic replacement into the non-virulent 7G8 P. falciparum line determine invasion competence into A. nancymaae and rat erythrocytes; polymorphisms at position 204 (204K or 204R) also confer rat erythrocyte invasion with differential neuraminidase sensitivity, defining the RH5 receptor-binding domain region.\",\n      \"method\": \"Allelic replacement mutagenesis, invasion assays into primate and rodent erythrocytes, neuraminidase treatment\",\n      \"journal\": \"Molecular and biochemical parasitology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — systematic allelic replacement at multiple codons with invasion phenotype readout, multiple independent transformants tested\",\n      \"pmids\": [\"23305874\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"7G8\"}]\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"CRISPR/Cas9 knockout of basigin (BSG) in JK-1 erythroleukemia-derived RBCs completely blocks P. falciparum invasion in a strain-transcendent manner, confirming the essential and universal role of the BSG–RH5 interaction for erythrocyte invasion across all tested strains.\",\n      \"method\": \"CRISPR/Cas9 gene knockout in immortal JK-1 erythroleukemia line, multi-strain P. falciparum invasion assay\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean genetic knockout with defined invasion phenotype, multiple parasite strains tested, replicates prior knockdown data with cleaner genetic tool\",\n      \"pmids\": [\"29078358\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    }\n  ],\n  \"current_model\": \"P. falciparum RH5 (PF3D7_0424100) is a small, rhoptry-localized merozoite ligand that is released during invasion to form an essential pentameric PCRCR complex (with PfRipr, PfCyRPA, PfCSS, and PfPTRAMP); within this complex, RH5 adopts a kite-shaped helical fold and binds the erythrocyte receptor basigin at one tip, an interaction that is universally required across all P. falciparum strains, triggers Ca²⁺ signaling and cytoskeletal rearrangement in the erythrocyte, produces a transient pore at the merozoite–erythrocyte interface, and is anchored to the merozoite surface prior to invasion via an interaction between its cleaved N-terminal region and the surface protein P113.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"RH5 (PF3D7_0424100) is an essential, rhoptry-localized merozoite ligand of P. falciparum that mediates a universally required step of erythrocyte invasion by engaging the host receptor basigin [#0, #2]. RH5 is unusual among the PfRh family in lacking transmembrane and cytosolic regions [#0]; it adopts a novel kite-shaped fold of nine mostly anti-parallel α-helices encasing an N-terminal β-hairpin, presenting the basigin-binding surface and inhibitory-antibody epitopes at one tip [#5, #6]. RH5 binding to basigin is essential and strain-transcending, established by soluble-basigin and antibody blockade, a low-affinity natural Ok(a−) variant, and CRISPR knockout of basigin that abolishes invasion by all tested strains [#2, #21]. This interaction is a molecular determinant of host tropism: RH5 binds human basigin with high affinity but chimpanzee basigin weakly and gorilla basigin not at all, and a single residue acquired after zoonotic transfer restricted the ancestral broadly-binding RH5 to human basigin [#4, #17]. Functionally, the RH5–basigin engagement triggers a Ca²⁺ signal in the erythrocyte with cytoskeletal phosphorylation changes, produces a transient pore/opening at the merozoite–erythrocyte interface, and acts after strong deformation but before AMA1-RON2 tight-junction formation [#8, #9, #11]. RH5 does not function alone: it assembles with PfRipr and the GPI-anchored CyRPA into a surface-tethered RCR complex, which is further bound by a disulfide-linked PfPTRAMP–PfCSS pair to form the pentameric PCRCR complex that anchors merozoite–erythrocyte membrane contact [#3, #7, #13, #18, #19]. Prior to invasion RH5 is anchored to the merozoite surface via its cleaved conserved N-terminal region binding the surface protein P113 [#10]. RH5 defines a Laverania-specific invasion mechanism, being absent from P. knowlesi and P. vivax where CyRPA and RIPR act in distinct complexes [#16]. Neutralizing anti-RH5 antibodies that block basigin binding are a mechanistic correlate of protection in vivo, and a class of non-neutralizing 'invasion-slowing' antibodies potentiates them [#12, #14, #15].\",\n  \"teleology\": [\n    {\n      \"year\": 2008,\n      \"claim\": \"Establishing RH5 as an essential apical merozoite ligand answered whether this atypical PfRh member participates in invasion at all and where it acts.\",\n      \"evidence\": \"Immunofluorescence rhoptry localization, inhibitory immune serum in invasion assays, and essentiality assessment in P. falciparum; genetic cross and allelic replacement linking RH5 polymorphisms to host erythrocyte range\",\n      \"pmids\": [\"19000690\", \"18621009\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Erythrocyte receptor not yet identified\", \"Molecular basis of the polymorphism-driven binding change unresolved\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2011,\n      \"claim\": \"Identifying basigin as the RH5 receptor and PfRipr as a binding partner answered what host molecule RH5 engages and revealed that RH5 acts within a parasite complex.\",\n      \"evidence\": \"AVEXIS library screen, SPR, basigin knockdown/antibody blockade and Ok(a−) invasion assays; ion-exchange/IP-MS identifying the RH5–PfRipr complex with distinct organellar origins in P. falciparum\",\n      \"pmids\": [\"22080952\", \"21909261\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"How the complex is tethered to the membrane-anchorless RH5 unknown\", \"Downstream signalling consequence of binding not defined\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Quantifying RH5 affinity for basigin across great-ape species and mapping the receptor-binding region tied the RH5–basigin interaction to P. falciparum host restriction and located the binding determinants.\",\n      \"evidence\": \"Recombinant binding assays with human/chimp/gorilla basigin plus basigin mutagenesis; allelic replacement at multiple RH5 codons scoring primate/rodent invasion; anti-RH5 vaccine antibody blocking and mAb epitope mapping in P. falciparum\",\n      \"pmids\": [\"24297912\", \"23305874\", \"24293631\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of binding not yet solved\", \"In-parasite role of specific residues on human basigin binding indirect\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"7G8\"}, {\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Solving the RH5 fold and its complex with basigin and inhibitory antibodies answered how RH5 is built and how it engages receptor and is neutralized.\",\n      \"evidence\": \"X-ray crystallography of RH5 alone (2.18 Å) and co-crystals of RH5 with basigin and inhibitory Fabs from P. falciparum 3D7 and other isolates\",\n      \"pmids\": [\"25296023\", \"25132548\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structure of the full multiprotein complex not resolved\", \"Mechanism linking binding to downstream invasion steps unknown\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"3D7\"}, {\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Defining the trimeric RH5–PfRipr–CyRPA complex and placing the RH5–basigin step in the invasion sequence answered how the anchorless RH5 is surface-tethered and what its engagement accomplishes mechanically.\",\n      \"evidence\": \"Reciprocal co-IP with GPI-anchor verification of CyRPA; live-cell imaging with staged receptor-ligand blockade defining pore formation after deformation and before tight junction in P. falciparum\",\n      \"pmids\": [\"25583518\", \"25723550\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular nature of the pore unresolved\", \"Signalling trigger downstream of pore not identified\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Conditional loss-of-function and junctional colocalization tied the RCR complex to Ca²⁺ release and tight-junction formation, establishing its indispensability at the invasion interface.\",\n      \"evidence\": \"TetR-DOZI conditional knockdown of PfRipr/CyRPA, super-resolution colocalization with RH5, and Ca²⁺ signalling assays in P. falciparum\",\n      \"pmids\": [\"27374406\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct mechanistic link from RH5–basigin binding to Ca²⁺ release not fully dissected\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Identifying the RH5 N-terminus–P113 interaction and showing RH5–basigin alone triggers erythrocyte Ca²⁺ signalling answered how RH5 is pre-anchored and confirmed its receptor engagement is a host-signalling event; CRISPR basigin knockout cemented the interaction's universal essentiality.\",\n      \"evidence\": \"AVEXIS interaction mapping of RH5Nt–P113; erythrocyte Ca²⁺ fluorescence and cytoskeletal phosphoproteomics with anti-RH5 blockade; CRISPR/Cas9 basigin knockout in JK-1 cells across strains (P. falciparum)\",\n      \"pmids\": [\"28186186\", \"28409866\", \"29078358\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"RH5Nt–P113 interaction lacks in-parasite genetic validation in the timeline\", \"Ca²⁺ signalling pathway components in erythrocyte not identified\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2018,\n      \"claim\": \"The cryo-EM RCR structure answered how CyRPA assembles the complex and proposed that RH5 and Ripr insert into the host membrane, refining the invasion mechanism.\",\n      \"evidence\": \"Cryo-EM at subnanometre resolution, JK-1 erythrocyte binding assays, and high-molecular-weight membrane-insertion analysis in P. falciparum\",\n      \"pmids\": [\"30542156\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Membrane-insertion model later challenged\", \"Full pentameric assembly not yet captured\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Functional dissection of anti-RH5 antibodies and species-comparative and ancestral-resurrection work established RH5-neutralizing antibody as a correlate of protection, defined a potentiator antibody class, and traced host-specificity evolution to a single residue.\",\n      \"evidence\": \"Passive transfer of Fc-null neutralizing vs non-neutralizing mAbs in Aotus; human mAb panels with live-imaging invasion-speed and GIA assays; conditional knockdown/co-IP in P. knowlesi and P. vivax; ancestral RH5 resurrection with SPR/AVEXIS and mutagenesis\",\n      \"pmids\": [\"31028254\", \"31204103\", \"31185066\", \"31613878\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism of invasion-slowing potentiation at molecular level not fully defined\", \"Species-divergence findings rest on single-lab comparative data\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}, {\"species\": \"Plasmodium knowlesi\", \"strain\": \"\"}, {\"species\": \"Plasmodium vivax\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Discovery of the pentameric PCRCR complex answered how the RCR complex is connected to the merozoite membrane and defined its role in anchoring membrane contact.\",\n      \"evidence\": \"Conditional knockouts of PfPTRAMP and PfCSS, invasion-inhibitory nanobodies, lattice light-sheet microscopy, and cryo-EM of nanobody–PfCSS complexes in P. falciparum\",\n      \"pmids\": [\"36396942\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Full-length assembled PCRCR structure not solved in this study\", \"Precise geometry of RH5 within the pentamer during contact unresolved\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2023,\n      \"claim\": \"The cryo-EM PfRCR structure revised the invasion model, showing a disulfide-locked rigid RH5 can still mediate invasion, arguing against RH5 membrane-insertion via conformational opening.\",\n      \"evidence\": \"Cryo-EM of the RH5–CyRPA–RIPR complex, disulfide-locked RH5 functional invasion assays, and PCRCR modelling in P. falciparum\",\n      \"pmids\": [\"38123677\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Exact molecular event coupling RH5 receptor binding to pore/signalling still not defined\", \"Structure of the fully assembled membrane-engaged pentamer not captured\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How RH5–basigin engagement is mechanistically transduced into erythrocyte Ca²⁺ release, cytoskeletal remodelling, and pore formation remains the central unresolved question.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No molecular identity for the transient pore\", \"Host signalling machinery downstream of RH5 binding unidentified\", \"In-parasite validation of RH5Nt–P113 anchoring not reported in the corpus\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0005102\", \"supporting_discovery_ids\": [0, 2, 4, 6, 17]},\n      {\"term_id\": \"GO:0046812\", \"supporting_discovery_ids\": [2, 21, 20]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0020008\", \"supporting_discovery_ids\": [0, 3]},\n      {\"term_id\": \"GO:0020002\", \"supporting_discovery_ids\": [2, 4, 6, 13]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"GO:0044409\", \"supporting_discovery_ids\": [0, 2, 8, 9, 21]},\n      {\"term_id\": \"GO:0019064\", \"supporting_discovery_ids\": [8, 9, 18, 19]}\n    ],\n    \"complexes\": [\n      \"RH5–PfRipr complex [#3]\",\n      \"RH5–CyRPA–PfRipr (RCR) trimeric complex [#7, #13, #19]\",\n      \"PfPTRAMP–PfCSS–RH5–CyRPA–PfRipr pentameric PCRCR complex [#18, #19]\"\n    ],\n    \"partners\": [\n      \"Basigin / CD147 (Ok blood group) — erythrocyte receptor [#2, #4, #17, #21]\",\n      \"PfRipr [#3, #13, #19]\",\n      \"CyRPA (GPI-anchored complex tether) [#7, #13, #19]\",\n      \"P113 (merozoite surface anchor for RH5 N-terminus) [#10]\",\n      \"PfPTRAMP [#18, #19]\",\n      \"PfCSS [#18, #19]\"\n    ],\n    \"other_free_text\": [\n      \"RH5 lacks transmembrane and cytosolic regions, unlike other PfRh family members [#0]\",\n      \"Adopts a novel kite-shaped fold of nine mostly anti-parallel α-helices encasing an N-terminal β-hairpin [#5, #6]\",\n      \"RH5–basigin binding triggers erythrocyte Ca²⁺ signalling and cytoskeletal phosphorylation changes, and produces a transient pore acting after deformation and before AMA1-RON2 tight junction [#8, #9, #11]\",\n      \"N-terminal region is cleaved during processing [#10]\",\n      \"RH5 is restricted to the Laverania subgenus and absent from P. knowlesi and P. vivax [#16]\",\n      \"Neutralizing anti-RH5 antibody blocking basigin binding is a mechanistic correlate of protection in Aotus [#12, #15]\",\n      \"Non-neutralizing 'invasion-slowing' anti-RH5 antibodies potentiate neutralizing antibodies [#14]\",\n      \"A disulfide-locked rigid RH5 mediates efficient invasion, arguing against a membrane-insertion opening model [#19]\"\n    ]\n  }\n}","audit_flag":null,"strains":[{"strain":"Pf3D7","gene_id":"PF3D7_0424100","name":null,"product":"reticulocyte binding protein homologue 5","uniprot_acc":null,"chromosome":null,"start_pos":null}],"gene_symbol":"RH5","evaluation":null}