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and STEVOR variant surface antigen families.","date":"2022","source":"BMC bioinformatics","url":"https://pubmed.ncbi.nlm.nih.gov/34991452","citation_count":2,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["rifin"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"38910420","id":"PMC_38910420","title":"Variable Surface Antigens of Plasmodium falciparum: Protein Families with Divergent Roles.","date":"2024","source":"Protein and peptide letters","url":"https://pubmed.ncbi.nlm.nih.gov/38910420","citation_count":1,"is_preprint":false,"source_species":["Pf"],"role":"primary","match_terms":["rifin"],"competing_organism_flag":false,"competing_organism_match":"","competing_organism_only":false},{"pmid":"41314148","id":"PMC_41314148","title":"A subset of Plasmodium falciparum RIFINs is linked to severe malaria risk reduction and engages LILRB1 through a conserved structural 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surface labeling and immunoprecipitation experiments showing clonally variant proteins of 30–45 kD on parasitized erythrocytes.\",\n      \"method\": \"Surface radioiodination, immunoprecipitation, indirect immunofluorescence 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 — two independent labs (PMID:10430943, PMID:10562315) used surface labeling, immunoprecipitation, and fluorescence microscopy to establish iRBC surface localization; replicated across studies.\",\n      \"pmids\": [\"10430943\", \"10562315\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2007,\n      \"finding\": \"A-type RIFINs are transported to the surface of infected erythrocytes via Maurer's clefts and are present in the apical region of merozoites, whereas B-type RIFINs are mostly retained inside the parasite and found in the cytosol of merozoites, demonstrating distinct subcellular localization patterns for the two RIFIN subgroups.\",\n      \"method\": \"Indirect immunofluorescence assay (IFA) with subgroup-specific antibodies, confocal microscopy, developmental stage fractionation\",\n      \"journal\": \"Molecular and biochemical parasitology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — direct localization experiments with specific antibodies across multiple developmental stages, replicated with multiple RIFIN variants and confirmed by a subsequent comparative study (PMID:26173856).\",\n      \"pmids\": [\"17719658\", \"26173856\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"A specific RIFIN (PFI0050c) is trafficked to Maurer's clefts (not the erythrocyte surface) when GFP is inserted internally; the C-terminal domain retains the protein within the parasite unless truncated. Brefeldin A (BFA) sensitivity in young rings establishes that early trafficking occurs via the classical secretory pathway. The hypervariable region appears to face the erythrocyte cytosol, anchored in the Maurer's cleft membrane.\",\n      \"method\": \"GFP-tagging (internal and C-terminal), live fluorescence microscopy of transfectants, selective permeabilization, Brefeldin A treatment, anti-RIFIN/anti-GFP immunofluorescence of live and fixed parasites\",\n      \"journal\": \"Traffic (Copenhagen, Denmark)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — multiple orthogonal approaches (GFP chimeras, BFA, selective permeabilization) in a single focused study with functional mechanistic conclusions.\",\n      \"pmids\": [\"17014697\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"3D7\"}]\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Plasmepsin V (an ER-resident protease) cleaves the N-terminal PEXEL motif of RIFINs, establishing that RIFIN export depends on Plasmepsin V-mediated proteolytic processing in the parasite endoplasmic reticulum.\",\n      \"method\": \"In vitro Plasmepsin V cleavage assays, N-terminal sequencing, mutagenesis of PEXEL motif residues\",\n      \"journal\": \"Traffic (Copenhagen, Denmark)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — direct in vitro enzyme assay with mutagenesis establishing the cleavage mechanism; single lab but multiple orthogonal biochemical methods.\",\n      \"pmids\": [\"23387285\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"RIFINs expressed on iRBC surfaces bind to uninfected RBCs—preferentially blood group A—to mediate rosette formation and also mediate microvascular binding of iRBCs, demonstrating a direct adhesion function for RIFINs in rosetting and sequestration.\",\n      \"method\": \"RIFIN-specific antibody blocking of rosetting, flow cytometry, confocal microscopy, binding assays with blood group A/O erythrocytes, recombinant RIFIN protein binding experiments\",\n      \"journal\": \"Nature medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal functional assays (antibody blocking, recombinant protein binding, blood group comparison) establishing a direct adhesion mechanism in a single rigorous study.\",\n      \"pmids\": [\"25751816\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"RIFINs and PfEMP1 share a common vesicular trafficking pathway from the parasitophorous vacuolar membrane through large multimeric vesicles (LMV) and Maurer's clefts to the infected erythrocyte surface; co-traffic with Pf332 occurs in sub-compartmentalized LMV where RIFINs/PfEMP1 localize at the outer rim.\",\n      \"method\": \"Immunofluorescence assay with anti-RIFIN and anti-PfEMP1 antibodies, fluorescent lipid (BODIPY-Ceramide) staining, confocal microscopy of vesicular intermediates\",\n      \"journal\": \"Molecular and biochemical parasitology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — co-localization with multiple markers across developmental stages in a single lab; establishes pathway position but limited to imaging without biochemical reconstitution.\",\n      \"pmids\": [\"14668007\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"A subset of RIFINs binds to the inhibitory immune receptor LILRB1 on B cells and NK cells; LILRB1-binding RIFINs inhibit activation of LILRB1-expressing B cells and NK cells, establishing that P. falciparum uses RIFINs to engage host inhibitory receptors for immune evasion. A different subset of RIFINs binds LAIR1.\",\n      \"method\": \"Recombinant RIFIN-receptor binding assays, flow cytometry (receptor binding on cell lines and primary immune cells), NK cell and B cell activation reporter assays, RIFIN expression library screening\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal assays (binding, cell activation, primary immune cells) in a rigorous study; replicated and extended by subsequent structural and functional studies (PMID:32650338, PMID:33647792).\",\n      \"pmids\": [\"29186116\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2020,\n      \"finding\": \"Crystal/cryo-EM structure of a LILRB1-binding RIFIN in complex with LILRB1 reveals that this RIFIN mimics the binding mode of the natural LILRB1 ligand MHC class I. A single mutation in the RIFIN disrupts binding to LILRB1 for all tested RIFINs and abolishes LILRB1-mediated signaling in a reporter assay. In a supported lipid bilayer NK cell system, RIFIN is recruited to the immunological synapse and reduces NK cell perforin mobilization.\",\n      \"method\": \"X-ray crystallography and cryo-EM structure determination, site-directed mutagenesis, LILRB1 signaling reporter assay, supported lipid bilayer NK cell activation assay, perforin mobilization measurement\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crystal structure plus mutagenesis plus functional signaling assay plus NK cell bilayer system; multiple orthogonal rigorous methods in a single study.\",\n      \"pmids\": [\"32650338\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"A specific RIFIN acts as a ligand for the inhibitory receptor LILRB2 (distinct from LILRB1); LILRB2 domain 3 mediates RIFIN binding, whereas LILRB2 domains 1 and 2 mediate binding to its natural ligand HLA class I, revealing a second inhibitory receptor targeted by RIFINs for immune evasion.\",\n      \"method\": \"RIFIN expression library screening, flow cytometry binding assays, domain-swap receptor binding experiments\",\n      \"journal\": \"Biochemical and biophysical research communications\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional binding assays with domain mapping; single lab, two orthogonal approaches (library screen + domain-swap binding).\",\n      \"pmids\": [\"33647792\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Crystal and cryo-EM structures of a RIFIN in complex with LAIR1 show that two different RIFINs engage similar binding sites on LAIR1 with different angles and that RIFIN-binding sites on LAIR1 overlap with the collagen-binding site. RIFINs use completely different binding sites to interact with LAIR1 versus LILRB1. RIFIN-induced LAIR1-mediated cell signaling was verified, and LAIR1-containing antibodies can block this pathway.\",\n      \"method\": \"X-ray crystallography, cryo-EM structure determination, cell signaling reporter assay, antibody blocking assay\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — two independent crystal structures plus functional signaling assay plus blocking assay; single lab but multiple rigorous orthogonal methods.\",\n      \"pmids\": [\"34433057\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Crystal and cryo-EM structures of a RIFIN bound to LILRB1 D3D4 or a D3D4-containing antibody Fab show that RIFINs bind LILRB1 through domain 3 (D3) in a mode similar to RIFIN-LAIR1 interaction; mass spectrometry and binding assays identified a large set of RIFINs that bind to LILRB1 D3.\",\n      \"method\": \"X-ray crystallography, cryo-electron microscopy, mass spectrometry, surface plasmon resonance binding assays\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — two independent structural methods (crystal + cryo-EM) combined with MS and binding assays; extends and replicates the RIFIN-LILRB1 structural mechanism.\",\n      \"pmids\": [\"33790470\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"The export of RIFIN (a PEXEL-positive protein) from the parasite ER is regulated sequentially by GTPases PfArf1 and PfRab1b; expression of inactive mutants of either PfRab1b or PfArf1 decreased RIFIN export, while transport of the PEXEL-negative PfAK2 was regulated only by PfArf1.\",\n      \"method\": \"Coimmunoprecipitation, mass spectrometry, indirect immunofluorescence, dominant-negative GTPase mutant expression, quantitative export assay\",\n      \"journal\": \"Frontiers in cellular and infection microbiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic dominant-negative approach plus co-IP plus IFA; single lab but multiple orthogonal methods establishing pathway position of RIFIN export.\",\n      \"pmids\": [\"33604307\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Promoter titration experiments with episomal rif promoters downregulate not only the rif/rifin gene family but also var, stevor, and Pfmc-2TM families, and these promoters co-localize in the same subnuclear expression site, establishing that all four clonally variant gene families share a common limiting transcriptional activation factor and nuclear architecture.\",\n      \"method\": \"Episomal promoter titration transfection, quantitative RT-PCR of multigene family transcripts, fluorescence in situ hybridization (FISH) for nuclear co-localization\",\n      \"journal\": \"Molecular microbiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic epistasis via promoter titration combined with nuclear co-localization; single lab, two orthogonal methods.\",\n      \"pmids\": [\"19708920\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"A-type RIFINs (not B-type) are among the parasite surface proteins whose expression is absent in a splenectomized patient's parasites that cannot sequester, and expression of A-type RIFINs is restored upon in vitro cultivation concomitantly with acquisition of endothelial adhesion ability (CD36, ICAM-1), supporting a functional role for A-type RIFINs in sequestration.\",\n      \"method\": \"Quantitative RT-PCR for rif gene subtype transcripts, in vitro adhesion assays to endothelial receptors, clinical parasite isolation and in vitro cultivation\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — natural genetic experiment (splenectomy patient) combined with adhesion assays and transcript analysis; unique clinical case with functional correlate.\",\n      \"pmids\": [\"19826486\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Membrane integration experiments using N-linked glycosylation as a reporter show that for RIFIN proteins tested, transmembrane segments TM1 and TM3 integrate into the ER membrane with an overall Ncyt-Ccyt topology, while the segment predicted to be TM2 is translocated to the ER lumen rather than residing in the membrane, challenging the previously proposed two-transmembrane topology model.\",\n      \"method\": \"Cell-free glycosylation reporter assay for ER membrane insertion and topology determination\",\n      \"journal\": \"The FEBS journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1 / Weak — rigorous glycosylation-based topology assay in a defined cell-free system; single lab, single method but mechanistically direct.\",\n      \"pmids\": [\"31821735\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"Immunoelectron microscopy and confocal microscopy with topology-specific antibodies establish that the semi-conserved N-terminal region of A-type RIFINs is exposed at the erythrocyte surface, while at Maurer's clefts, both the semi-conserved N-terminal region and variable stretch of RIFINs point to the lumen, supporting a single transmembrane topology rather than two.\",\n      \"method\": \"Confocal microscopy, immunoelectron microscopy, selective membrane permeabilization, immunoblot across life cycle stages\",\n      \"journal\": \"Malaria journal\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal imaging and topology methods (confocal, immuno-EM, permeabilization); single lab, comparative across protein family members.\",\n      \"pmids\": [\"26173856\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"In P. berghei, the C-terminal domain of a P. falciparum RIFIN prevents GFP export by a KAHRP-like N-terminal signal, demonstrating that the RIFIN C-terminus contains an export-inhibitory signal distinct from the export-permissive PfEMP1 C-terminus.\",\n      \"method\": \"GFP fusion protein expression in P. berghei, fluorescence microscopy of transfectants, domain swapping between RIFIN/KAHRP/PfEMP1 sequences\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct domain-swap functional experiment in a heterologous Plasmodium species; single lab with functional GFP export readout.\",\n      \"pmids\": [\"20419102\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium berghei\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Conditional deletion of the chromodomain protein PfCDP (which binds H3K9me3) in P. falciparum using a DiCre-LoxP system leads to selective upregulation of a subset of rifin genes and promotes RBC rosette formation, establishing PfCDP as an epigenetic repressor of a subset of rifins and linking RIFIN expression to rosetting.\",\n      \"method\": \"Conditional DiCre-LoxP chromodomain deletion, RNA-seq, ChIP for H3K9me3, rosette formation assay, confocal microscopy\",\n      \"journal\": \"Journal of molecular biology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — inducible genetic deletion with transcriptomic readout and functional rosetting assay; single lab, multiple orthogonal methods.\",\n      \"pmids\": [\"35460670\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"A clade of RIFINs binds to inhibitory receptor KIR2DL1 more strongly than the natural human ligand MHC class I; this interaction mediates inhibitory signaling and suppresses KIR2DL1-expressing NK cell activation. The same RIFINs also bind activating receptor KIR2DS1, resulting in activation of KIR2DS1-expressing NK cells. Crystal structures reveal the RIFIN binding mode on KIR2DL1 and KIR2DS1.\",\n      \"method\": \"Recombinant RIFIN-receptor binding assays, surface plasmon resonance, X-ray crystallography, NK cell activation assays (KIR2DL1 and KIR2DS1 reporter cells and primary NK cells), field strain RIFIN library screening\",\n      \"journal\": \"Nature\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — crystal structure plus SPR binding plus functional NK cell assays; single study with multiple rigorous orthogonal methods establishing both structural and functional mechanism.\",\n      \"pmids\": [\"40500441\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"A subset of RIFINs engages LILRB1 through a conserved structural motif anchored by disulfide-bonded cysteines; crystallographic analysis of LILRB1-RIFIN complexes shows LILRB1 binds RIFINs and MHC-I by overlapping interfaces, confirming convergent recognition. SPR binding assays quantify the interaction.\",\n      \"method\": \"Protein microarray immunoproteomics, logistic regression for clinical association, surface plasmon resonance, X-ray crystallography of LILRB1-RIFIN complexes, synthetic peptide interaction studies\",\n      \"journal\": \"EBioMedicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — crystal structure combined with SPR binding and synthetic peptide assays; single study but multiple rigorous mechanistic methods establishing structural basis of LILRB1 engagement.\",\n      \"pmids\": [\"41314148\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"A-type and B-type RIFINs are distinct functional subgroups within the RIFIN family, identified through phylogenetic and function-shift analyses; function-shift analysis predicts neo- or sub-functionalization has occurred between the two subgroups, consistent with their experimentally observed distinct subcellular localizations.\",\n      \"method\": \"Phylogenetic analysis, function-shift (Diverge) statistical analysis of subgroup sequences\",\n      \"journal\": \"BMC genomics\",\n      \"confidence\": \"Low\",\n      \"confidence_rationale\": \"Tier 4 / Weak — computational/phylogenetic analysis only; no direct experimental manipulation of the specific gene.\",\n      \"pmids\": [\"18197962\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Diverse expression patterns of rif subgroups exist during gametocytogenesis: A-type RIFINs accumulate in discrete punctate structures at the infected erythrocyte membrane in gametocytes, while B-type RIFINs associate with the parasite. Transcription analysis indicates group-specific regulation for A-type and variant-specific regulation for B-type RIFINs during sexual differentiation.\",\n      \"method\": \"Immunofluorescence assay with subgroup-specific antibodies, quantitative RT-PCR across gametocyte stages, phylogenetic analysis of 5' upstream regions\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — direct localization by IFA and quantitative transcriptional profiling across developmental stages; single lab, two orthogonal methods but no functional perturbation.\",\n      \"pmids\": [\"19020666\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"RIF proteins are naturally immunogenic in humans: recombinant RIF proteins were recognized by antibodies from malaria-exposed adults, and the localization of the protein was demonstrated at the ring and young trophozoite-infected erythrocyte membrane by immunofluorescence microscopy using human immune sera.\",\n      \"method\": \"ELISA with recombinant RIF proteins, indirect immunofluorescence microscopy with human immune sera\",\n      \"journal\": \"Infection and immunity\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — direct localization by IFA confirmed with human immune sera; single lab, single method for localization.\",\n      \"pmids\": [\"12438381\"],\n      \"is_preprint\": false,\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    }\n  ],\n  \"current_model\": \"RIFINs are a large family of clonally variant P. falciparum proteins that are exported from the parasite ER via sequential Plasmepsin V-mediated PEXEL cleavage and GTPase (PfArf1/PfRab1b)-dependent vesicular transport, trafficked through Maurer's clefts to the infected erythrocyte surface with a single-pass (Ncyt-Ccyt) transmembrane topology; A-type RIFINs reach the iRBC surface where they mediate blood-group-A-preferential rosetting and microvascular adhesion, while a subset of RIFINs suppresses host NK cell and B cell responses by directly binding and activating inhibitory immune receptors (LILRB1, LILRB2, LAIR1, KIR2DL1) in a mode that mimics MHC class I recognition, and some RIFINs can also engage activating receptor KIR2DS1 to promote NK cell killing of infected erythrocytes; RIFIN expression is epigenetically silenced by H3K9me3-binding chromodomain protein PfCDP and by a shared limiting transcriptional activator common to all P. falciparum clonally variant gene families.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"The rif multigene family, of which PF3D7_0100400 is one member, encodes clonally variant RIFIN proteins exported to the surface of P. falciparum-infected erythrocytes, where they act both as adhesins and as immune-evasion ligands [#0, #4, #6]. RIFINs are synthesized as PEXEL-containing proteins whose N-terminal PEXEL motif is proteolytically processed by the ER-resident protease Plasmepsin V, a step required for export [#3]; subsequent ER exit is governed sequentially by the GTPases PfArf1 and PfRab1b, and the proteins traffic through Maurer's clefts en route to the iRBC surface [#11, #2]. Trafficking and localization differ by subgroup: A-type RIFINs reach the erythrocyte surface via Maurer's clefts, whereas B-type RIFINs are largely retained within the parasite, and a C-terminal export-inhibitory signal restricts surface delivery unless removed [#1, #16]. At the membrane RIFINs adopt a single-pass Ncyt-Ccyt topology with the semi-conserved N-terminal region exposed at the erythrocyte surface [#14, #15]. Functionally, surface RIFINs mediate rosetting with a preference for blood group A erythrocytes and contribute to microvascular sequestration [#4, #13], and RIFIN expression and rosetting are epigenetically repressed by the H3K9me3-binding chromodomain protein PfCDP [#17]. A distinct immune-evasion mechanism operates through direct engagement of host immune receptors: subsets of RIFINs bind the inhibitory receptors LILRB1, LILRB2 and LAIR1 to suppress NK and B cell activation, in a mode structurally convergent with MHC class I recognition, and a clade of RIFINs additionally engages the inhibitory receptor KIR2DL1 while also binding the activating receptor KIR2DS1 [#6, #7, #8, #9, #18]. The corpus establishes these properties for RIFINs as a family; no finding characterizes PF3D7_0100400 individually beyond its membership in this family.\",\n  \"teleology\": [\n    {\n      \"year\": 1999,\n      \"claim\": \"Establishing that RIFINs are expressed on the iRBC surface as clonally variant proteins defined them as candidate variant surface antigens rather than purely intracellular products.\",\n      \"evidence\": \"Surface radioiodination, immunoprecipitation and IFA of parasitized erythrocytes\",\n      \"pmids\": [\"10430943\", \"10562315\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not identify the receptor or function of surface RIFINs\", \"No distinction between individual family members including PF3D7_0100400\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2004,\n      \"claim\": \"Placing RIFINs in a shared vesicular trafficking route with PfEMP1 defined the intracellular path by which surface variant antigens reach the erythrocyte membrane.\",\n      \"evidence\": \"Co-localization IFA with anti-RIFIN/anti-PfEMP1 antibodies and fluorescent lipid staining of vesicular intermediates\",\n      \"pmids\": [\"14668007\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Imaging-based; no biochemical reconstitution of the vesicle machinery\", \"Molecular sorting determinants not defined\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2006,\n      \"claim\": \"Dissecting the trafficking determinants showed the RIFIN C-terminal domain retains the protein and that early export uses the classical secretory pathway, distinguishing surface delivery from Maurer's cleft retention.\",\n      \"evidence\": \"Internal/C-terminal GFP tagging, live microscopy, Brefeldin A treatment and selective permeabilization in strain 3D7\",\n      \"pmids\": [\"17014697\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Tested one specific RIFIN (PFI0050c), not PF3D7_0100400\", \"Molecular identity of the C-terminal retention signal receptor unknown\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"3D7\"}]\n    },\n    {\n      \"year\": 2007,\n      \"claim\": \"Showing A-type RIFINs reach the surface while B-type RIFINs are parasite-retained established that the two subgroups have functionally distinct trafficking fates.\",\n      \"evidence\": \"Subgroup-specific IFA, confocal microscopy and developmental stage fractionation\",\n      \"pmids\": [\"17719658\", \"26173856\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of subgroup trafficking divergence not resolved\", \"Individual member assignment not made\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"A domain-swap in P. berghei localized an export-inhibitory signal to the RIFIN C-terminus, contrasting it with the export-permissive PfEMP1 C-terminus.\",\n      \"evidence\": \"GFP fusion and domain swapping expressed heterologously in P. berghei\",\n      \"pmids\": [\"20419102\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Shown in heterologous P. berghei, not native P. falciparum\", \"Recognition machinery for the inhibitory signal not identified\"],\n      \"attribution\": [{\"species\": \"Plasmodium berghei\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Identifying Plasmepsin V as the protease that cleaves the RIFIN PEXEL motif defined the biochemical gatekeeping step for RIFIN export.\",\n      \"evidence\": \"In vitro Plasmepsin V cleavage assay, N-terminal sequencing and PEXEL mutagenesis\",\n      \"pmids\": [\"23387285\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Downstream sorting after cleavage not defined in this study\", \"Not resolved for PF3D7_0100400 specifically\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Demonstrating RIFIN-mediated blood group A-preferential rosetting and microvascular binding assigned a direct adhesion function to surface RIFINs relevant to disease pathology.\",\n      \"evidence\": \"Antibody blocking of rosetting, recombinant RIFIN binding, and blood group A/O comparison; plus clinical splenectomy case linking A-type RIFIN expression to sequestration\",\n      \"pmids\": [\"25751816\", \"19826486\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Erythrocyte surface receptor(s) mediating rosetting not fully defined\", \"Contribution of PF3D7_0100400 individually not measured\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Topology mapping placed the semi-conserved N-terminal region at the erythrocyte surface, favoring a single-transmembrane model over an earlier two-TM proposal.\",\n      \"evidence\": \"Immuno-EM, confocal microscopy, selective permeabilization and immunoblot across stages; later corroborated by a cell-free glycosylation reporter assay\",\n      \"pmids\": [\"26173856\", \"31821735\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Topology inferred from a subset of family members\", \"Structure of the membrane-embedded region not solved\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Discovering that RIFIN subsets bind the inhibitory receptors LILRB1 and LAIR1 established RIFINs as active suppressors of host NK and B cell responses, redefining them as immune-evasion ligands.\",\n      \"evidence\": \"Recombinant RIFIN-receptor binding, flow cytometry, NK/B cell activation reporters and RIFIN expression library screening\",\n      \"pmids\": [\"29186116\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis not yet resolved at this stage\", \"Which specific RIFINs (including PF3D7_0100400) bind which receptor not enumerated\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2020,\n      \"claim\": \"Structures of a RIFIN-LILRB1 complex revealed molecular mimicry of MHC class I and a single mutation that abolishes binding and signaling, defining the mechanism of inhibitory receptor engagement.\",\n      \"evidence\": \"X-ray crystallography, cryo-EM, mutagenesis, LILRB1 reporter and supported-lipid-bilayer NK cell perforin assay\",\n      \"pmids\": [\"32650338\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"A single RIFIN structure represents a diverse family\", \"In vivo consequence for parasite survival not measured\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Extending receptor engagement to LILRB2 (via its domain 3) and detailing distinct LAIR1 and LILRB1 (D3) binding modes established that RIFINs target multiple inhibitory receptors through separable interfaces.\",\n      \"evidence\": \"Library screening, domain-swap binding, X-ray/cryo-EM structures, SPR, mass spectrometry and cell signaling/blocking assays\",\n      \"pmids\": [\"33647792\", \"34433057\", \"33790470\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Relative contribution of each receptor to immune evasion in vivo unresolved\", \"Individual member (PF3D7_0100400) receptor specificity not assigned\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Showing RIFIN ER exit requires sequential PfArf1 and PfRab1b activity positioned RIFIN export within a defined GTPase-dependent trafficking cascade downstream of Plasmepsin V processing.\",\n      \"evidence\": \"Dominant-negative GTPase expression, co-IP, mass spectrometry, IFA and quantitative export assay\",\n      \"pmids\": [\"33604307\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct GTPase-RIFIN cargo interaction not demonstrated\", \"Not resolved for PF3D7_0100400 specifically\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2022,\n      \"claim\": \"Conditional deletion of PfCDP linked H3K9me3-based epigenetic silencing to derepression of a rifin subset and enhanced rosetting, tying RIFIN expression control to a chromatin reader.\",\n      \"evidence\": \"DiCre-LoxP chromodomain deletion, RNA-seq, H3K9me3 ChIP and rosette assay\",\n      \"pmids\": [\"35460670\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Which rifins are direct PfCDP targets not fully defined\", \"PF3D7_0100400 status among the derepressed subset not stated\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": 2025,\n      \"claim\": \"Structural and functional characterization of RIFIN engagement of KIR2DL1 and the activating receptor KIR2DS1 revealed that RIFINs can both suppress and trigger NK cell responses, expanding the receptor repertoire and adding an activating dimension.\",\n      \"evidence\": \"Recombinant binding, SPR, X-ray crystallography and NK cell activation assays with field-strain RIFIN library screening; plus a LILRB1-RIFIN structural/immunoproteomic study\",\n      \"pmids\": [\"40500441\", \"41314148\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Net in vivo balance between inhibitory and activating engagement unknown\", \"Individual member (PF3D7_0100400) receptor targeting not determined\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"It remains unknown what PF3D7_0100400 does individually — its specific receptor targets, trafficking behavior, and adhesive properties have not been distinguished from the family as a whole in the available corpus.\",\n      \"evidence\": \"No discovery isolates PF3D7_0100400 from other rif family members\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"No member-specific functional assignment for PF3D7_0100400\", \"Subgroup (A vs B) classification of PF3D7_0100400 not stated\", \"Receptor specificity of PF3D7_0100400 unknown\"],\n      \"attribution\": [{\"species\": \"Plasmodium falciparum\", \"strain\": \"\"}]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0050839\", \"supporting_discovery_ids\": [4]},\n      {\"term_id\": \"GO:0038023\", \"supporting_discovery_ids\": [6, 7, 8, 9, 18]},\n      {\"term_id\": \"GO:0005102\", \"supporting_discovery_ids\": [6, 7, 8, 9, 10, 18, 19]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0020030\", \"supporting_discovery_ids\": [0, 1, 4, 15, 22]},\n      {\"term_id\": \"GO:0020036\", \"supporting_discovery_ids\": [1, 2, 5, 15]},\n      {\"term_id\": \"GO:0005789\", \"supporting_discovery_ids\": [3, 14]},\n      {\"term_id\": \"GO:0016020\", \"supporting_discovery_ids\": [14, 15]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"GO:0046898\", \"supporting_discovery_ids\": [3, 11, 2, 5]},\n      {\"term_id\": \"GO:0002376\", \"supporting_discovery_ids\": [6, 7, 9, 18]},\n      {\"term_id\": \"GO:0007155\", \"supporting_discovery_ids\": [4, 13, 17]},\n      {\"term_id\": \"GO:0006338\", \"supporting_discovery_ids\": [12, 17]}\n    ],\n    \"complexes\": [\n      \"RIFIN-LILRB1 complex\",\n      \"RIFIN-LILRB2 complex\",\n      \"RIFIN-LAIR1 complex\",\n      \"RIFIN-KIR2DL1 complex\",\n      \"RIFIN-KIR2DS1 complex\"\n    ],\n    \"partners\": [\n      \"LILRB1\",\n      \"LILRB2\",\n      \"LAIR1\",\n      \"KIR2DL1\",\n      \"KIR2DS1\",\n      \"Plasmepsin V\",\n      \"PfArf1\",\n      \"PfRab1b\",\n      \"PfCDP\",\n      \"PfEMP1 (shared trafficking pathway)\",\n      \"Pf332 (co-trafficking)\"\n    ],\n    \"other_free_text\": [\n      \"PF3D7_0100400 is a member of the rif multigene family; the corpus characterizes RIFIN properties at the family/subgroup level and does not isolate the function of this individual gene.\",\n      \"RIFINs are divided into A-type (surface-exported, adhesion/immune-evasion) and B-type (parasite-retained) subgroups; the subgroup of PF3D7_0100400 is not stated in the timeline.\",\n      \"RIFIN engagement of inhibitory receptors structurally mimics MHC class I recognition, indicating convergent molecular mimicry.\",\n      \"RIFIN adhesion shows a preference for blood group A erythrocytes in rosetting.\",\n      \"rif shares a limiting transcriptional activator and subnuclear expression site with var, stevor and Pfmc-2TM families.\",\n      \"RIF proteins are naturally immunogenic in malaria-exposed humans.\"\n    ]\n  }\n}","audit_flag":null,"strains":[{"strain":"Pf3D7","gene_id":"PF3D7_0100400","name":null,"product":"rifin","uniprot_acc":null,"chromosome":null,"start_pos":null}],"gene_symbol":"","evaluation":null}