{"gene":"KIR2DL3","run_date":"2026-04-28T18:30:27","timeline":{"discoveries":[{"year":1993,"finding":"p58 (KIR2DL3/GL183) molecules function as NK cell receptors for HLA-C alleles; masking p58 with F(ab')2 antibody fragments restores lysis of HLA-C-protected target cells, demonstrating that p58 delivers an inhibitory signal upon HLA-C recognition.","method":"Antibody blocking/reconstitution assay, functional cytotoxicity assay with HLA-C transfectants","journal":"The Journal of experimental medicine","confidence":"High","confidence_rationale":"Tier 2 — reciprocal functional reconstitution across multiple NK clones and target cell lines, replicated with multiple antibody formats","pmids":["8340759"],"is_preprint":false},{"year":1995,"finding":"KIR2DL3 (p58/GL183) and related p58 molecules are members of the immunoglobulin superfamily with diversity in both extracellular Ig-like domains and intracellular cytoplasmic domains; at least five distinct p58 receptors exist in a single individual with three types of transmembrane/cytoplasmic domains.","method":"Molecular cloning, cDNA sequence analysis","journal":"Immunity","confidence":"High","confidence_rationale":"Tier 1 — original molecular cloning with sequence characterization, foundational paper with >500 citations","pmids":["7749980"],"is_preprint":false},{"year":1995,"finding":"EB6 (KIR2DL1-related) molecules exist in both inhibitory p58 (~58 kD) and activatory p50 (~50 kD) forms; the molecular weight difference is not due to differential glycosylation but reflects distinct peptide compositions as shown by two-dimensional peptide mapping; cross-linking of p50 triggers cytolytic activity and Ca2+ flux, while p58 cross-linking inhibits lysis without Ca2+ increase.","method":"Biochemical deglycosylation, proteolytic peptide mapping, 2D peptide mapping, calcium flux assay, cytotoxicity assay","journal":"The Journal of experimental medicine","confidence":"High","confidence_rationale":"Tier 1 — multiple orthogonal biochemical methods in a single study with functional validation","pmids":["7650491"],"is_preprint":false},{"year":1994,"finding":"p58 molecules associate in vivo with CD3 zeta chains (preferentially as zeta-zeta homodimers or zeta-gamma heterodimers) and with the p56lck kinase; mAb-mediated signaling via p58 enhances p58/p56lck association; however, p58-mediated inhibition of NK triggering is not accompanied by down-regulation of tyrosine phosphorylation of CD16-associated CD3 zeta chains.","method":"Co-immunoprecipitation, 2D diagonal gel electrophoresis, anti-phosphotyrosine immunoblotting, surface modulation experiments","journal":"European journal of immunology","confidence":"High","confidence_rationale":"Tier 2 — reciprocal co-IP with multiple molecular partners and functional signaling assays","pmids":["7523145"],"is_preprint":false},{"year":1997,"finding":"A single amino acid at position 44 of the first Ig domain of KIR2DL3 (lysine 44) determines specificity for HLA-Cw3-related alleles; swapping methionine 44 (in Cw4-specific KIR) with lysine 44 (in Cw3-specific KIR) is sufficient to switch HLA-C allotype specificity.","method":"Site-directed mutagenesis of KIR-Ig fusion proteins, direct binding assay to HLA-C transfectants","journal":"Journal of immunology","confidence":"High","confidence_rationale":"Tier 1 — reconstitution with mutagenesis and direct binding assay","pmids":["9126959"],"is_preprint":false},{"year":1997,"finding":"Direct binding of soluble KIR2DL3 (cl42) to HLA-Cw4 on TAP-deficient RMA-S cells requires exogenous peptide loading and exhibits peptide selectivity; substitutions at positions 7 and 8 of the nonamer peptide QYDDAVYKL abolish KIR binding despite similar HLA-C surface expression.","method":"Direct binding assay of soluble KIR-Ig fusion protein to peptide-loaded TAP-deficient cells, NK cell inhibition assay","journal":"The Journal of experimental medicine","confidence":"High","confidence_rationale":"Tier 1 — direct binding reconstitution with systematic peptide mutagenesis","pmids":["9126935"],"is_preprint":false},{"year":1997,"finding":"Position 70 in the p58.1 (KIR2DL3-related) inhibitory receptor is a critical determinant of binding affinity for HLA-Cw4; substitution of threonine 70 by lysine in p58.1 almost abolishes HLA-C binding, while the reverse substitution in the activatory p50.1 (lysine→threonine) dramatically increases affinity.","method":"Soluble receptor-Fc fusion proteins, site-directed mutagenesis, binding assay to HLA-C transfectants","journal":"European journal of immunology","confidence":"High","confidence_rationale":"Tier 1 — reconstituted binding with site-directed mutagenesis, strong mechanistic result","pmids":["9464792"],"is_preprint":false},{"year":1998,"finding":"Inhibitory p58 (NKAT2/KIR2DL3) binds HLA-Cw7 with rapid association and dissociation rates, while the highly homologous activating p50 receptors bind HLA-C only very weakly or not at all; the difference in HLA-C recognition capacity resides in the transmembrane/cytoplasmic tail differences between p58 and p50.","method":"Direct binding assay comparing p58 and p50 receptors to HLA-Cw7, kinetic analysis","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1 — quantitative binding comparisons with multiple receptor variants","pmids":["9826699"],"is_preprint":false},{"year":1999,"finding":"Crystal structure of the extracellular region of KIR2DL3 reveals two tandem immunoglobulin-like domains with an unusually acute interdomain elbow angle of 23° different from the related receptor KIR2DL1; the putative HLA class I binding site spans both domains at the outer surface of the elbow, suggesting domain orientation modulates ligand binding.","method":"X-ray crystallography","journal":"Structure","confidence":"High","confidence_rationale":"Tier 1 — crystal structure with functional implications validated by comparison to KIR2DL1","pmids":["10196125"],"is_preprint":false},{"year":1995,"finding":"Coexpression of two functionally independent p58 inhibitory receptors (GL183 for Cw3-related alleles and EB6 for Cw4-related alleles) in individual NK clones results in inability to kill all normal allogeneic HLA-C+ targets; the two receptors function independently and can be co-immunoprecipitated from GL183+/EB6+ clones in digitonin.","method":"Co-immunoprecipitation, antibody blocking, cytotoxicity assay with HLA-C allele-specific transfectants","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 — co-IP plus functional reconstitution with multiple target cell types","pmids":["7724594"],"is_preprint":false},{"year":2008,"finding":"KIR2DL2 is a stronger receptor for HLA-C than KIR2DL3; the avidity difference maps to the Ig-like domains, specifically a synergistic combination of arginine for proline 16 in D1 and cysteine for arginine 148 in D2 (neither near the ligand-binding site); these substitutions likely alter the hinge angle between domains and change relative domain orientation.","method":"Binding assays to 93 HLA isoforms, site-directed mutagenesis of recombinant KIR, functional analysis","journal":"Journal of immunology","confidence":"High","confidence_rationale":"Tier 1 — systematic mutagenesis with extensive binding panel, mechanistic model supported","pmids":["18322206"],"is_preprint":false},{"year":2012,"finding":"Position 70 dominates avidity modulation of KIR2DL3 for HLA-C; position 44 modulates specificity for HLA-C allotype groups (C1 vs C2); positions 71 and 131 control cross-reactivity with HLA-A*11:02. KIR2DL3 has lower avidity and broader specificity than KIR2DL1 and can be mutated to increase avidity, while KIR2DL1 specificity is resistant to mutation.","method":"Systematic point mutagenesis at six positions, binding to 95 HLA allotypes","journal":"Journal of immunology","confidence":"High","confidence_rationale":"Tier 1 — comprehensive mutagenesis with large HLA panel","pmids":["22772445"],"is_preprint":false},{"year":2013,"finding":"KIR2DL3*005, a KIR2DL3 allele, has increased binding affinity and avidity for HLA-C comparable to KIR2DL2; site-directed mutagenesis showed that the combination of arginine at residue 11 and glutamic acid at residue 35 (distal to the KIR/HLA-C interface) is critical, likely by altering the interdomain hinge angle.","method":"Surface plasmon resonance, KIR binding to HLA allotype panel, site-directed mutagenesis, molecular modeling, NK cell functional assay","journal":"Journal of immunology","confidence":"High","confidence_rationale":"Tier 1 — SPR binding kinetics with mutagenesis and functional validation","pmids":["23686481"],"is_preprint":false},{"year":2021,"finding":"Crystal structures of KIR2DL2 and KIR2DL3 in complex with HLA-C*07:02 reveal that KIR2DL2 and KIR2DL3 differ in docking modality over HLA-C*07:02; mutagenesis assays demonstrated differences in the mechanism of HLA-C1 allotype recognition by KIR2DL2 vs KIR2DL3; KIR2DS2 influences functional differences between KIR2DL2 and KIR2DL3 recognition.","method":"X-ray crystallography of KIR/HLA-C complexes, mutagenesis, primary NK cell functional assay","journal":"Nature communications","confidence":"High","confidence_rationale":"Tier 1 — co-crystal structures with functional mutagenesis validation","pmids":["33846289"],"is_preprint":false},{"year":1999,"finding":"Engagement of KIR2DL3 (transgenic) in T cells can inhibit mixed lymphocyte reaction and anti-CD3-redirected cytotoxicity; however, antigen- and anti-CD3-induced cytotoxicity by alloreactive CTLs cannot be inhibited by KIR2DL3 engagement, demonstrating that KIR2DL3 inhibitory signaling is context-dependent and varies with the activation state of T cells.","method":"KIR2DL3 transgenic mouse model, functional cytotoxicity assays, MLR assay","journal":"Blood","confidence":"Medium","confidence_rationale":"Tier 2 — in vivo transgenic model with defined functional readouts, single lab","pmids":["10498612"],"is_preprint":false},{"year":2015,"finding":"A p24 Gag sequence variant (T303V) selected in HIV-1-infected individuals with KIR2DL3 and HLA-C*03:04 significantly enhances KIR2DL3 binding to HLA-C*03:04-expressing cells, resulting in reduced activation of primary KIR2DL3+ NK cells; structural modeling and surface plasmon resonance confirmed peptide-dependent modulation of KIR2DL3/HLA-C interaction as a viral immune escape mechanism.","method":"KIR2DL3-IgG fusion binding assay, primary NK cell functional assay, surface plasmon resonance, structural modeling","journal":"PLoS medicine","confidence":"High","confidence_rationale":"Tier 1-2 — SPR binding, primary cell functional assay, and structural modeling with cohort validation","pmids":["26575988"],"is_preprint":false},{"year":2016,"finding":"A specific HCV core-derived peptide (YIPLVGAPL) bound to HLA-C*03:04 significantly enhances KIR2DL3 binding and suppresses primary KIR2DL3+ NK cell function; genotype-specific sequence variations in this peptide reduce KIR2DL3 binding and NK cell inhibition, demonstrating peptide-sequence-dependent regulation of KIR2DL3 inhibitory signaling.","method":"KIR2DL3-IgG fusion protein binding assay, HLA stabilization assay, primary NK cell functional assay","journal":"Journal of hepatology","confidence":"High","confidence_rationale":"Tier 2 — multiple orthogonal methods, direct binding and functional readouts","pmids":["27057987"],"is_preprint":false},{"year":2017,"finding":"HLA-B*46:01, formed by mini-conversion introducing the C1 epitope from HLA-C*01:02 into HLA-B, has a low-diversity peptidome; 21% of its peptides (with common C-terminal characteristics) form ligands for KIR2DL3, establishing that peptide C-terminal features determine which HLA-B*46:01-peptide complexes engage KIR2DL3.","method":"High-resolution mass spectrometry peptidome analysis, KIR2DL3 binding assays","journal":"Cell reports","confidence":"Medium","confidence_rationale":"Tier 2 — MS peptidome with KIR2DL3 binding functional data, single study","pmids":["28514659"],"is_preprint":false},{"year":2014,"finding":"KIR2DL3-positive NK cells are more sensitive to changes in peptide content of MHC class I than KIR2DL2-positive NK cells; weakly inhibitory peptide VAPWNSRAL discriminates KIR2DL3 from KIR2DL2 NK cell responses, suggesting KIR2DL3 has a finer peptide discrimination threshold than KIR2DL2.","method":"NK cell functional assay with defined peptides, mathematical modeling","journal":"European journal of immunology","confidence":"Medium","confidence_rationale":"Tier 2 — defined peptide functional assay with quantitative modeling, single lab","pmids":["25359276"],"is_preprint":false},{"year":2010,"finding":"KIR2DL3 alleles KIR2DL3*005 and KIR2DL3*015 are not recognized by the anti-KIR2DL3-specific ECM41 mAb; site-directed mutagenesis demonstrated that glutamine at position 35 is required for ECM41 staining, and glutamic acid 35 and arginine 50 are relevant for EB6B/11PB6 mAb staining; KIR2DL3*005 HLA-C specificity is not different from other KIR2DL2/L3 alleles.","method":"Genotype/phenotype analysis, site-directed mutagenesis, functional HLA-C specificity testing","journal":"Journal of immunology","confidence":"Medium","confidence_rationale":"Tier 2 — mutagenesis mapping of epitopes with functional confirmation","pmids":["20525888"],"is_preprint":false},{"year":1996,"finding":"p70 (Bw4-specific) and p58 (HLA-C-specific, including KIR2DL3-related) NK receptors are physically and functionally independent; co-immunoprecipitation and cross-modulation experiments demonstrate no physical association between p70 and p58, and antibody-mediated cross-linking of one does not affect the other.","method":"Co-immunoprecipitation, antibody cross-modulation, functional cytotoxicity assay","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"Medium","confidence_rationale":"Tier 2 — reciprocal functional and biochemical independence demonstrated","pmids":["8643653"],"is_preprint":false}],"current_model":"KIR2DL3 is an inhibitory NK cell receptor belonging to the immunoglobulin superfamily with two extracellular Ig-like domains that binds HLA-C group 1 (C1) allotypes in a peptide-sequence-dependent manner; binding affinity and HLA-C allotype specificity are determined by key residues (positions 44, 70, 71, 131, and allosteric positions 11, 16, 35, 148) that modulate the interdomain hinge angle, while inhibitory signaling is transmitted through the receptor's long cytoplasmic tail via association with CD3 zeta chains and p56lck, and KIR2DL3 delivers weaker inhibitory signals with broader HLA-C cross-reactivity compared to KIR2DL1 or KIR2DL2."},"narrative":{"teleology":[{"year":1993,"claim":"The fundamental question of whether p58/GL183 molecules function as NK inhibitory receptors recognizing HLA-C was answered: masking p58 restored lysis of HLA-C-protected targets, establishing KIR2DL3 as an HLA-C-specific inhibitory receptor.","evidence":"Antibody blocking/reconstitution cytotoxicity assays with HLA-C transfectants and multiple NK clones","pmids":["8340759"],"confidence":"High","gaps":["Molecular identity and sequence of the receptor not yet determined","Signaling pathway downstream of receptor engagement unknown","Precise HLA-C allotype specificity not defined"]},{"year":1994,"claim":"How KIR2DL3 signals intracellularly was partially resolved: p58 associates with CD3ζ chains and p56lck, yet inhibition does not require downregulation of CD16-associated ζ-chain phosphorylation, revealing a signaling mechanism distinct from simple signal blockade.","evidence":"Co-immunoprecipitation, 2D diagonal gel electrophoresis, anti-phosphotyrosine immunoblotting","pmids":["7523145"],"confidence":"High","gaps":["Role of ITIM-recruited phosphatases (SHP-1/SHP-2) not yet identified","Stoichiometry and dynamics of ζ-chain association unclear","Whether ζ-chain association is required for inhibitory function untested"]},{"year":1995,"claim":"Molecular cloning established KIR2DL3 as a member of the immunoglobulin superfamily with two extracellular Ig domains and a long cytoplasmic tail, and showed that inhibitory (p58) and activating (p50) KIR forms differ in cytoplasmic domain composition rather than glycosylation.","evidence":"cDNA cloning/sequencing, biochemical deglycosylation, 2D peptide mapping, calcium flux and cytotoxicity assays","pmids":["7749980","7650491"],"confidence":"High","gaps":["Three-dimensional structure not yet determined","Structural basis for activating vs inhibitory signaling unknown"]},{"year":1995,"claim":"Coexpression of KIR2DL3 (GL183) and KIR2DL1 (EB6) on individual NK clones was shown to confer independent, additive inhibition against distinct HLA-C allotypes, and p70 (KIR3DL1) was demonstrated to be physically and functionally independent of p58, establishing that KIR receptors operate as non-redundant, independent modules.","evidence":"Co-immunoprecipitation, antibody blocking, cytotoxicity assays with HLA-C allele-specific transfectants","pmids":["7724594","8643653"],"confidence":"High","gaps":["Whether KIR co-expression affects signaling thresholds quantitatively unknown","Integration of signals from multiple KIR at the synapse not addressed"]},{"year":1997,"claim":"The molecular determinants of HLA-C allotype specificity and binding affinity were identified: position 44 switches C1 vs C2 specificity, position 70 is critical for binding affinity, and KIR2DL3 binding to HLA-C is peptide-dependent with selectivity at peptide positions 7 and 8.","evidence":"Site-directed mutagenesis of KIR-Ig fusion proteins, direct binding assays to HLA-C transfectants and peptide-loaded TAP-deficient cells","pmids":["9126959","9464792","9126935"],"confidence":"High","gaps":["Structural basis for peptide selectivity at positions 7-8 not resolved","Full spectrum of permissive vs non-permissive peptides unknown"]},{"year":1998,"claim":"Kinetic analysis showed KIR2DL3 (p58) binds HLA-Cw7 with rapid on/off rates while the activating p50 counterpart binds weakly or not at all, localizing the binding difference to extracellular domain features rather than solely cytoplasmic regions.","evidence":"Quantitative binding assays comparing p58 and p50 receptor variants with HLA-Cw7","pmids":["9826699"],"confidence":"High","gaps":["Exact structural difference between p58 and p50 extracellular domains responsible for binding difference not pinpointed"]},{"year":1999,"claim":"The crystal structure of KIR2DL3 revealed an unusually acute 23° interdomain hinge angle distinct from KIR2DL1, with the HLA-C binding site spanning both domains at the elbow, providing a structural framework for how domain orientation tunes ligand recognition.","evidence":"X-ray crystallography of KIR2DL3 extracellular region","pmids":["10196125"],"confidence":"High","gaps":["No co-crystal with HLA-C yet obtained","Dynamic hinge movements not characterized","How hinge angle relates to signaling strength not addressed"]},{"year":1999,"claim":"Transgenic expression in T cells showed KIR2DL3 inhibitory signaling is context-dependent: it inhibits MLR and anti-CD3-redirected killing but cannot override strong antigen-driven CTL activation.","evidence":"KIR2DL3 transgenic mouse model with functional cytotoxicity and MLR assays","pmids":["10498612"],"confidence":"Medium","gaps":["Threshold of activation signal required to override KIR2DL3 inhibition not quantified","Relevance of mouse transgenic system to human NK cell biology uncertain","Signaling intermediates that are overridden not identified"]},{"year":2008,"claim":"The lower avidity of KIR2DL3 compared to KIR2DL2 was mapped to allosteric positions 16 and 148, distal to the ligand-binding interface, that synergistically modulate hinge angle and domain orientation rather than direct contact residues.","evidence":"Binding assays across 93 HLA isoforms combined with site-directed mutagenesis of recombinant KIR","pmids":["18322206"],"confidence":"High","gaps":["Exact hinge angle changes induced by positions 16 and 148 not measured structurally","Whether these positions affect signaling dynamics beyond avidity unknown"]},{"year":2012,"claim":"Systematic mutagenesis comprehensively mapped functional residue contributions: position 70 dominates avidity, position 44 governs C1/C2 specificity, and positions 71/131 control cross-reactivity with HLA-A*11:02, establishing KIR2DL3 as a lower-avidity but broader-specificity receptor than KIR2DL1.","evidence":"Systematic point mutagenesis at six positions with binding to 95 HLA allotypes","pmids":["22772445"],"confidence":"High","gaps":["Functional significance of HLA-A cross-reactivity in vivo unknown","Whether avidity/specificity tradeoff is physiologically adaptive not tested"]},{"year":2013,"claim":"The KIR2DL3*005 allele achieves KIR2DL2-like binding affinity through allosteric residues Arg11 and Glu35 that alter the hinge angle, demonstrating that natural polymorphism uses the same allosteric mechanism to tune inhibitory strength.","evidence":"Surface plasmon resonance, mutagenesis, molecular modeling, primary NK cell functional assays","pmids":["23686481"],"confidence":"High","gaps":["Crystal structure of KIR2DL3*005 not obtained","Population-level functional consequences of this allele not established"]},{"year":2015,"claim":"Viral exploitation of peptide-dependent KIR2DL3 recognition was demonstrated: an HIV-1 Gag variant (T303V) selected in KIR2DL3+/HLA-C*03:04+ individuals enhances KIR2DL3 binding and suppresses NK activation, establishing peptide-mediated immune evasion.","evidence":"KIR2DL3-IgG fusion binding, primary NK cell functional assays, SPR, structural modeling, patient cohort data","pmids":["26575988"],"confidence":"High","gaps":["Whether this escape mechanism operates during acute vs chronic infection unclear","Breadth of viral peptide variants exploiting this pathway not fully catalogued"]},{"year":2016,"claim":"HCV similarly exploits peptide-dependent KIR2DL3 modulation: an HCV core peptide bound to HLA-C*03:04 enhances KIR2DL3 binding and suppresses NK function, while genotype-specific sequence variation reduces inhibition, revealing convergent viral immune evasion across pathogens.","evidence":"KIR2DL3-IgG binding, HLA stabilization assay, primary NK cell functional assays","pmids":["27057987"],"confidence":"High","gaps":["Structural basis for peptide-dependent enhancement at the co-crystal level not determined for HCV peptides","In vivo validation in HCV-infected patients not performed"]},{"year":2021,"claim":"Co-crystal structures of KIR2DL2 and KIR2DL3 with HLA-C*07:02 revealed distinct docking modalities between the two receptors, providing the structural basis for their differential recognition of C1 allotypes and explaining why KIR2DS2 influences KIR2DL2 vs KIR2DL3 functional outcomes.","evidence":"X-ray crystallography of KIR/HLA-C complexes with mutagenesis and primary NK cell assays","pmids":["33846289"],"confidence":"High","gaps":["Structures with diverse peptides not obtained","How docking modality differences translate to signaling kinetics at the immune synapse not resolved"]},{"year":null,"claim":"Key unresolved questions include how KIR2DL3 integrates inhibitory signaling at the immune synapse (role of ITIM-recruited phosphatases, signaling dynamics), the full repertoire of self and viral peptides that tune KIR2DL3 engagement, and how hinge-angle dynamics measured in solution relate to signaling strength in living NK cells.","evidence":"","pmids":[],"confidence":"Low","gaps":["ITIM/SHP-1/SHP-2 signaling mechanism not directly characterized for KIR2DL3","No comprehensive peptide-KIR2DL3-HLA-C structural survey exists","Biophysical measurements of hinge dynamics in membrane-embedded KIR lacking"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[0,14]},{"term_id":"GO:0060089","term_label":"molecular transducer activity","supporting_discovery_ids":[0,5,15,16]}],"localization":[{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[0,1,9]}],"pathway":[{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[0,5,14,15,16]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[3,14]}],"complexes":[],"partners":["CD3Z","LCK","HLA-C"],"other_free_text":[]},"mechanistic_narrative":"KIR2DL3 is an inhibitory natural killer cell receptor of the immunoglobulin superfamily that recognizes HLA-C group 1 (C1) allotypes in a peptide-sequence-dependent manner to suppress NK cell cytotoxicity [PMID:8340759, PMID:9126935]. Ligand specificity is determined by position 44 in the first Ig-like domain, while positions 70, 71, and 131 govern binding avidity and cross-reactivity, and allosteric residues distal to the binding interface (positions 11, 16, 35, 148) modulate affinity by altering the interdomain hinge angle revealed by crystallography [PMID:9126959, PMID:22772445, PMID:10196125, PMID:18322206, PMID:23686481]. KIR2DL3 delivers weaker inhibitory signals than the closely related KIR2DL2 and exhibits greater sensitivity to peptide content of HLA-C, a property exploited by viral sequence variants in HIV-1 and HCV that enhance KIR2DL3 engagement to evade NK cell responses [PMID:25359276, PMID:26575988, PMID:27057987]. Inhibitory signaling is transmitted through the long cytoplasmic tail via association with CD3ζ chains and p56lck, and is context-dependent, as strong T cell activation can override KIR2DL3-mediated inhibition [PMID:7523145, PMID:10498612]."},"prefetch_data":{"uniprot":{"accession":"P43628","full_name":"Killer cell immunoglobulin-like receptor 2DL3","aliases":["CD158 antigen-like family member B2","KIR-023GB","Killer inhibitory receptor cl 2-3","NKAT2a","NKAT2b","Natural killer-associated transcript 2","NKAT-2","p58 natural killer cell receptor clone CL-6","p58 NK receptor CL-6","p58.2 MHC class-I-specific NK receptor"],"length_aa":341,"mass_kda":37.9,"function":"Receptor on natural killer (NK) cells for HLA-C alleles (HLA-Cw1, HLA-Cw3 and HLA-Cw7). Inhibits the activity of NK cells thus preventing cell lysis","subcellular_location":"Cell membrane","url":"https://www.uniprot.org/uniprotkb/P43628/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/KIR2DL3","classification":"Not Classified","n_dependent_lines":4,"n_total_lines":1208,"dependency_fraction":0.0033112582781456954},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/KIR2DL3","total_profiled":1310},"omim":[{"mim_id":"609532","title":"HEPATITIS C VIRUS, SUSCEPTIBILITY TO","url":"https://www.omim.org/entry/609532"},{"mim_id":"609423","title":"HUMAN IMMUNODEFICIENCY VIRUS TYPE 1, SUSCEPTIBILITY TO","url":"https://www.omim.org/entry/609423"},{"mim_id":"604955","title":"KILLER CELL IMMUNOGLOBULIN-LIKE RECEPTOR, TWO DOMAINS, SHORT CYTOPLASMIC TAIL, 4; KIR2DS4","url":"https://www.omim.org/entry/604955"},{"mim_id":"604953","title":"KILLER CELL IMMUNOGLOBULIN-LIKE RECEPTOR, TWO DOMAINS, SHORT CYTOPLASMIC TAIL, 2; KIR2DS2","url":"https://www.omim.org/entry/604953"},{"mim_id":"604938","title":"KILLER CELL IMMUNOGLOBULIN-LIKE RECEPTOR, TWO DOMAINS, LONG CYTOPLASMIC TAIL, 3; KIR2DL3","url":"https://www.omim.org/entry/604938"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"","locations":[],"tissue_specificity":"Tissue enhanced","tissue_distribution":"Detected in single","driving_tissues":[{"tissue":"lymphoid tissue","ntpm":1.4}],"url":"https://www.proteinatlas.org/search/KIR2DL3"},"hgnc":{"alias_symbol":["cl-6","nkat2","nkat2a","nkat2b","p58","CD158B2"],"prev_symbol":[]},"alphafold":{"accession":"P43628","domains":[{"cath_id":"2.60.40.10","chopping":"24-122","consensus_level":"high","plddt":93.3986,"start":24,"end":122},{"cath_id":"2.60.40.10","chopping":"127-220","consensus_level":"high","plddt":94.8754,"start":127,"end":220}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P43628","model_url":"https://alphafold.ebi.ac.uk/files/AF-P43628-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P43628-F1-predicted_aligned_error_v6.png","plddt_mean":76.88},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=KIR2DL3","jax_strain_url":"https://www.jax.org/strain/search?query=KIR2DL3"},"sequence":{"accession":"P43628","fasta_url":"https://rest.uniprot.org/uniprotkb/P43628.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P43628/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P43628"}},"corpus_meta":[{"pmid":"7749980","id":"PMC_7749980","title":"Molecular clones of the p58 NK cell receptor reveal immunoglobulin-related molecules with diversity in both the extra- and intracellular domains.","date":"1995","source":"Immunity","url":"https://pubmed.ncbi.nlm.nih.gov/7749980","citation_count":543,"is_preprint":false},{"pmid":"8340759","id":"PMC_8340759","title":"P58 molecules as putative receptors for major histocompatibility complex (MHC) class I molecules in human natural killer (NK) cells. Anti-p58 antibodies reconstitute lysis of MHC class I-protected cells in NK clones displaying different specificities.","date":"1993","source":"The Journal of experimental medicine","url":"https://pubmed.ncbi.nlm.nih.gov/8340759","citation_count":514,"is_preprint":false},{"pmid":"7650491","id":"PMC_7650491","title":"Existence of both inhibitory (p58) and activatory (p50) receptors for HLA-C molecules in human natural killer cells.","date":"1995","source":"The Journal of experimental medicine","url":"https://pubmed.ncbi.nlm.nih.gov/7650491","citation_count":423,"is_preprint":false},{"pmid":"18322206","id":"PMC_18322206","title":"Synergistic polymorphism at two positions distal to the ligand-binding site makes KIR2DL2 a stronger receptor for HLA-C than KIR2DL3.","date":"2008","source":"Journal of immunology (Baltimore, Md. : 1950)","url":"https://pubmed.ncbi.nlm.nih.gov/18322206","citation_count":324,"is_preprint":false},{"pmid":"8760804","id":"PMC_8760804","title":"The natural killer 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sciences","url":"https://pubmed.ncbi.nlm.nih.gov/30696053","citation_count":20,"is_preprint":false},{"pmid":"21517231","id":"PMC_21517231","title":"Cytotoxic activity of artemisinin derivatives against cholangiocarcinoma (CL-6) and hepatocarcinoma (Hep-G2) cell lines.","date":"2011","source":"Asian Pacific journal of cancer prevention : APJCP","url":"https://pubmed.ncbi.nlm.nih.gov/21517231","citation_count":20,"is_preprint":false},{"pmid":"15963510","id":"PMC_15963510","title":"Cyclin-dependent kinase 11(p58) interacts with HBO1 and enhances its histone acetyltransferase activity.","date":"2005","source":"FEBS letters","url":"https://pubmed.ncbi.nlm.nih.gov/15963510","citation_count":19,"is_preprint":false},{"pmid":"9549046","id":"PMC_9549046","title":"Insulin induction of pip 92, CL-6, and novel mRNAs in rat hepatoma cells.","date":"1997","source":"Endocrine","url":"https://pubmed.ncbi.nlm.nih.gov/9549046","citation_count":19,"is_preprint":false},{"pmid":"25368604","id":"PMC_25368604","title":"Deletion of P58(IPK), the Cellular Inhibitor of the Protein Kinases PKR and PERK, Causes Bone Changes and Joint Degeneration in Mice.","date":"2014","source":"Frontiers in endocrinology","url":"https://pubmed.ncbi.nlm.nih.gov/25368604","citation_count":19,"is_preprint":false},{"pmid":"8649794","id":"PMC_8649794","title":"Tyrosine phosphorylation at the membrane-microfilament interface: a p185neu-associated signal transduction particle containing Src, Abl and phosphorylated p58, a membrane- and microfilament-associated retroviral gag-like protein.","date":"1996","source":"Oncogene","url":"https://pubmed.ncbi.nlm.nih.gov/8649794","citation_count":19,"is_preprint":false},{"pmid":"15910415","id":"PMC_15910415","title":"Aloe emodin-induced apoptosis in t-HSC/Cl-6 cells involves a mitochondria-mediated 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Structure and Magnetism of the Hexanuclear, &mgr;(6)-Oxo-Centered [OFe(6)(H(-)(3)thme)(3)(OCH(3))(3)Cl(6)](2)(-) (thme = 1,1,1-Tris(hydroxymethyl)ethane).","date":"1996","source":"Inorganic chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/11666660","citation_count":18,"is_preprint":false},{"pmid":"21078675","id":"PMC_21078675","title":"Thr-370 is responsible for CDK11(p58) autophosphorylation, dimerization, and kinase activity.","date":"2010","source":"The Journal of biological chemistry","url":"https://pubmed.ncbi.nlm.nih.gov/21078675","citation_count":17,"is_preprint":false},{"pmid":"21612809","id":"PMC_21612809","title":"Virus infection rapidly activates the P58(IPK) pathway, delaying peak kinase activation to enhance viral replication.","date":"2011","source":"Virology","url":"https://pubmed.ncbi.nlm.nih.gov/21612809","citation_count":17,"is_preprint":false},{"pmid":"15245374","id":"PMC_15245374","title":"Investigation of killer cell immunoglobulin-like receptor gene diversity III. 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masking p58 with F(ab')2 antibody fragments restores lysis of HLA-C-protected target cells, demonstrating that p58 delivers an inhibitory signal upon HLA-C recognition.\",\n      \"method\": \"Antibody blocking/reconstitution assay, functional cytotoxicity assay with HLA-C transfectants\",\n      \"journal\": \"The Journal of experimental medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal functional reconstitution across multiple NK clones and target cell lines, replicated with multiple antibody formats\",\n      \"pmids\": [\"8340759\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1995,\n      \"finding\": \"KIR2DL3 (p58/GL183) and related p58 molecules are members of the immunoglobulin superfamily with diversity in both extracellular Ig-like domains and intracellular cytoplasmic domains; at least five distinct p58 receptors exist in a single individual with three types of transmembrane/cytoplasmic domains.\",\n      \"method\": \"Molecular cloning, cDNA sequence analysis\",\n      \"journal\": \"Immunity\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — original molecular cloning with sequence characterization, foundational paper with >500 citations\",\n      \"pmids\": [\"7749980\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1995,\n      \"finding\": \"EB6 (KIR2DL1-related) molecules exist in both inhibitory p58 (~58 kD) and activatory p50 (~50 kD) forms; the molecular weight difference is not due to differential glycosylation but reflects distinct peptide compositions as shown by two-dimensional peptide mapping; cross-linking of p50 triggers cytolytic activity and Ca2+ flux, while p58 cross-linking inhibits lysis without Ca2+ increase.\",\n      \"method\": \"Biochemical deglycosylation, proteolytic peptide mapping, 2D peptide mapping, calcium flux assay, cytotoxicity assay\",\n      \"journal\": \"The Journal of experimental medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — multiple orthogonal biochemical methods in a single study with functional validation\",\n      \"pmids\": [\"7650491\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1994,\n      \"finding\": \"p58 molecules associate in vivo with CD3 zeta chains (preferentially as zeta-zeta homodimers or zeta-gamma heterodimers) and with the p56lck kinase; mAb-mediated signaling via p58 enhances p58/p56lck association; however, p58-mediated inhibition of NK triggering is not accompanied by down-regulation of tyrosine phosphorylation of CD16-associated CD3 zeta chains.\",\n      \"method\": \"Co-immunoprecipitation, 2D diagonal gel electrophoresis, anti-phosphotyrosine immunoblotting, surface modulation experiments\",\n      \"journal\": \"European journal of immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal co-IP with multiple molecular partners and functional signaling assays\",\n      \"pmids\": [\"7523145\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1997,\n      \"finding\": \"A single amino acid at position 44 of the first Ig domain of KIR2DL3 (lysine 44) determines specificity for HLA-Cw3-related alleles; swapping methionine 44 (in Cw4-specific KIR) with lysine 44 (in Cw3-specific KIR) is sufficient to switch HLA-C allotype specificity.\",\n      \"method\": \"Site-directed mutagenesis of KIR-Ig fusion proteins, direct binding assay to HLA-C transfectants\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — reconstitution with mutagenesis and direct binding assay\",\n      \"pmids\": [\"9126959\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1997,\n      \"finding\": \"Direct binding of soluble KIR2DL3 (cl42) to HLA-Cw4 on TAP-deficient RMA-S cells requires exogenous peptide loading and exhibits peptide selectivity; substitutions at positions 7 and 8 of the nonamer peptide QYDDAVYKL abolish KIR binding despite similar HLA-C surface expression.\",\n      \"method\": \"Direct binding assay of soluble KIR-Ig fusion protein to peptide-loaded TAP-deficient cells, NK cell inhibition assay\",\n      \"journal\": \"The Journal of experimental medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — direct binding reconstitution with systematic peptide mutagenesis\",\n      \"pmids\": [\"9126935\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1997,\n      \"finding\": \"Position 70 in the p58.1 (KIR2DL3-related) inhibitory receptor is a critical determinant of binding affinity for HLA-Cw4; substitution of threonine 70 by lysine in p58.1 almost abolishes HLA-C binding, while the reverse substitution in the activatory p50.1 (lysine→threonine) dramatically increases affinity.\",\n      \"method\": \"Soluble receptor-Fc fusion proteins, site-directed mutagenesis, binding assay to HLA-C transfectants\",\n      \"journal\": \"European journal of immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — reconstituted binding with site-directed mutagenesis, strong mechanistic result\",\n      \"pmids\": [\"9464792\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"Inhibitory p58 (NKAT2/KIR2DL3) binds HLA-Cw7 with rapid association and dissociation rates, while the highly homologous activating p50 receptors bind HLA-C only very weakly or not at all; the difference in HLA-C recognition capacity resides in the transmembrane/cytoplasmic tail differences between p58 and p50.\",\n      \"method\": \"Direct binding assay comparing p58 and p50 receptors to HLA-Cw7, kinetic analysis\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — quantitative binding comparisons with multiple receptor variants\",\n      \"pmids\": [\"9826699\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"Crystal structure of the extracellular region of KIR2DL3 reveals two tandem immunoglobulin-like domains with an unusually acute interdomain elbow angle of 23° different from the related receptor KIR2DL1; the putative HLA class I binding site spans both domains at the outer surface of the elbow, suggesting domain orientation modulates ligand binding.\",\n      \"method\": \"X-ray crystallography\",\n      \"journal\": \"Structure\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — crystal structure with functional implications validated by comparison to KIR2DL1\",\n      \"pmids\": [\"10196125\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1995,\n      \"finding\": \"Coexpression of two functionally independent p58 inhibitory receptors (GL183 for Cw3-related alleles and EB6 for Cw4-related alleles) in individual NK clones results in inability to kill all normal allogeneic HLA-C+ targets; the two receptors function independently and can be co-immunoprecipitated from GL183+/EB6+ clones in digitonin.\",\n      \"method\": \"Co-immunoprecipitation, antibody blocking, cytotoxicity assay with HLA-C allele-specific transfectants\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — co-IP plus functional reconstitution with multiple target cell types\",\n      \"pmids\": [\"7724594\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"KIR2DL2 is a stronger receptor for HLA-C than KIR2DL3; the avidity difference maps to the Ig-like domains, specifically a synergistic combination of arginine for proline 16 in D1 and cysteine for arginine 148 in D2 (neither near the ligand-binding site); these substitutions likely alter the hinge angle between domains and change relative domain orientation.\",\n      \"method\": \"Binding assays to 93 HLA isoforms, site-directed mutagenesis of recombinant KIR, functional analysis\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — systematic mutagenesis with extensive binding panel, mechanistic model supported\",\n      \"pmids\": [\"18322206\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Position 70 dominates avidity modulation of KIR2DL3 for HLA-C; position 44 modulates specificity for HLA-C allotype groups (C1 vs C2); positions 71 and 131 control cross-reactivity with HLA-A*11:02. KIR2DL3 has lower avidity and broader specificity than KIR2DL1 and can be mutated to increase avidity, while KIR2DL1 specificity is resistant to mutation.\",\n      \"method\": \"Systematic point mutagenesis at six positions, binding to 95 HLA allotypes\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — comprehensive mutagenesis with large HLA panel\",\n      \"pmids\": [\"22772445\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"KIR2DL3*005, a KIR2DL3 allele, has increased binding affinity and avidity for HLA-C comparable to KIR2DL2; site-directed mutagenesis showed that the combination of arginine at residue 11 and glutamic acid at residue 35 (distal to the KIR/HLA-C interface) is critical, likely by altering the interdomain hinge angle.\",\n      \"method\": \"Surface plasmon resonance, KIR binding to HLA allotype panel, site-directed mutagenesis, molecular modeling, NK cell functional assay\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — SPR binding kinetics with mutagenesis and functional validation\",\n      \"pmids\": [\"23686481\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"Crystal structures of KIR2DL2 and KIR2DL3 in complex with HLA-C*07:02 reveal that KIR2DL2 and KIR2DL3 differ in docking modality over HLA-C*07:02; mutagenesis assays demonstrated differences in the mechanism of HLA-C1 allotype recognition by KIR2DL2 vs KIR2DL3; KIR2DS2 influences functional differences between KIR2DL2 and KIR2DL3 recognition.\",\n      \"method\": \"X-ray crystallography of KIR/HLA-C complexes, mutagenesis, primary NK cell functional assay\",\n      \"journal\": \"Nature communications\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 — co-crystal structures with functional mutagenesis validation\",\n      \"pmids\": [\"33846289\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"Engagement of KIR2DL3 (transgenic) in T cells can inhibit mixed lymphocyte reaction and anti-CD3-redirected cytotoxicity; however, antigen- and anti-CD3-induced cytotoxicity by alloreactive CTLs cannot be inhibited by KIR2DL3 engagement, demonstrating that KIR2DL3 inhibitory signaling is context-dependent and varies with the activation state of T cells.\",\n      \"method\": \"KIR2DL3 transgenic mouse model, functional cytotoxicity assays, MLR assay\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — in vivo transgenic model with defined functional readouts, single lab\",\n      \"pmids\": [\"10498612\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"A p24 Gag sequence variant (T303V) selected in HIV-1-infected individuals with KIR2DL3 and HLA-C*03:04 significantly enhances KIR2DL3 binding to HLA-C*03:04-expressing cells, resulting in reduced activation of primary KIR2DL3+ NK cells; structural modeling and surface plasmon resonance confirmed peptide-dependent modulation of KIR2DL3/HLA-C interaction as a viral immune escape mechanism.\",\n      \"method\": \"KIR2DL3-IgG fusion binding assay, primary NK cell functional assay, surface plasmon resonance, structural modeling\",\n      \"journal\": \"PLoS medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1-2 — SPR binding, primary cell functional assay, and structural modeling with cohort validation\",\n      \"pmids\": [\"26575988\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"A specific HCV core-derived peptide (YIPLVGAPL) bound to HLA-C*03:04 significantly enhances KIR2DL3 binding and suppresses primary KIR2DL3+ NK cell function; genotype-specific sequence variations in this peptide reduce KIR2DL3 binding and NK cell inhibition, demonstrating peptide-sequence-dependent regulation of KIR2DL3 inhibitory signaling.\",\n      \"method\": \"KIR2DL3-IgG fusion protein binding assay, HLA stabilization assay, primary NK cell functional assay\",\n      \"journal\": \"Journal of hepatology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 — multiple orthogonal methods, direct binding and functional readouts\",\n      \"pmids\": [\"27057987\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"HLA-B*46:01, formed by mini-conversion introducing the C1 epitope from HLA-C*01:02 into HLA-B, has a low-diversity peptidome; 21% of its peptides (with common C-terminal characteristics) form ligands for KIR2DL3, establishing that peptide C-terminal features determine which HLA-B*46:01-peptide complexes engage KIR2DL3.\",\n      \"method\": \"High-resolution mass spectrometry peptidome analysis, KIR2DL3 binding assays\",\n      \"journal\": \"Cell reports\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — MS peptidome with KIR2DL3 binding functional data, single study\",\n      \"pmids\": [\"28514659\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"KIR2DL3-positive NK cells are more sensitive to changes in peptide content of MHC class I than KIR2DL2-positive NK cells; weakly inhibitory peptide VAPWNSRAL discriminates KIR2DL3 from KIR2DL2 NK cell responses, suggesting KIR2DL3 has a finer peptide discrimination threshold than KIR2DL2.\",\n      \"method\": \"NK cell functional assay with defined peptides, mathematical modeling\",\n      \"journal\": \"European journal of immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — defined peptide functional assay with quantitative modeling, single lab\",\n      \"pmids\": [\"25359276\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"KIR2DL3 alleles KIR2DL3*005 and KIR2DL3*015 are not recognized by the anti-KIR2DL3-specific ECM41 mAb; site-directed mutagenesis demonstrated that glutamine at position 35 is required for ECM41 staining, and glutamic acid 35 and arginine 50 are relevant for EB6B/11PB6 mAb staining; KIR2DL3*005 HLA-C specificity is not different from other KIR2DL2/L3 alleles.\",\n      \"method\": \"Genotype/phenotype analysis, site-directed mutagenesis, functional HLA-C specificity testing\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — mutagenesis mapping of epitopes with functional confirmation\",\n      \"pmids\": [\"20525888\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1996,\n      \"finding\": \"p70 (Bw4-specific) and p58 (HLA-C-specific, including KIR2DL3-related) NK receptors are physically and functionally independent; co-immunoprecipitation and cross-modulation experiments demonstrate no physical association between p70 and p58, and antibody-mediated cross-linking of one does not affect the other.\",\n      \"method\": \"Co-immunoprecipitation, antibody cross-modulation, functional cytotoxicity assay\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 — reciprocal functional and biochemical independence demonstrated\",\n      \"pmids\": [\"8643653\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"KIR2DL3 is an inhibitory NK cell receptor belonging to the immunoglobulin superfamily with two extracellular Ig-like domains that binds HLA-C group 1 (C1) allotypes in a peptide-sequence-dependent manner; binding affinity and HLA-C allotype specificity are determined by key residues (positions 44, 70, 71, 131, and allosteric positions 11, 16, 35, 148) that modulate the interdomain hinge angle, while inhibitory signaling is transmitted through the receptor's long cytoplasmic tail via association with CD3 zeta chains and p56lck, and KIR2DL3 delivers weaker inhibitory signals with broader HLA-C cross-reactivity compared to KIR2DL1 or KIR2DL2.\"\n}\n```","stage2_raw":"```json\n{\n  \"mechanistic_narrative\": \"KIR2DL3 is an inhibitory natural killer cell receptor of the immunoglobulin superfamily that recognizes HLA-C group 1 (C1) allotypes in a peptide-sequence-dependent manner to suppress NK cell cytotoxicity [PMID:8340759, PMID:9126935]. Ligand specificity is determined by position 44 in the first Ig-like domain, while positions 70, 71, and 131 govern binding avidity and cross-reactivity, and allosteric residues distal to the binding interface (positions 11, 16, 35, 148) modulate affinity by altering the interdomain hinge angle revealed by crystallography [PMID:9126959, PMID:22772445, PMID:10196125, PMID:18322206, PMID:23686481]. KIR2DL3 delivers weaker inhibitory signals than the closely related KIR2DL2 and exhibits greater sensitivity to peptide content of HLA-C, a property exploited by viral sequence variants in HIV-1 and HCV that enhance KIR2DL3 engagement to evade NK cell responses [PMID:25359276, PMID:26575988, PMID:27057987]. Inhibitory signaling is transmitted through the long cytoplasmic tail via association with CD3ζ chains and p56lck, and is context-dependent, as strong T cell activation can override KIR2DL3-mediated inhibition [PMID:7523145, PMID:10498612].\",\n  \"teleology\": [\n    {\n      \"year\": 1993,\n      \"claim\": \"The fundamental question of whether p58/GL183 molecules function as NK inhibitory receptors recognizing HLA-C was answered: masking p58 restored lysis of HLA-C-protected targets, establishing KIR2DL3 as an HLA-C-specific inhibitory receptor.\",\n      \"evidence\": \"Antibody blocking/reconstitution cytotoxicity assays with HLA-C transfectants and multiple NK clones\",\n      \"pmids\": [\"8340759\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular identity and sequence of the receptor not yet determined\", \"Signaling pathway downstream of receptor engagement unknown\", \"Precise HLA-C allotype specificity not defined\"]\n    },\n    {\n      \"year\": 1994,\n      \"claim\": \"How KIR2DL3 signals intracellularly was partially resolved: p58 associates with CD3ζ chains and p56lck, yet inhibition does not require downregulation of CD16-associated ζ-chain phosphorylation, revealing a signaling mechanism distinct from simple signal blockade.\",\n      \"evidence\": \"Co-immunoprecipitation, 2D diagonal gel electrophoresis, anti-phosphotyrosine immunoblotting\",\n      \"pmids\": [\"7523145\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Role of ITIM-recruited phosphatases (SHP-1/SHP-2) not yet identified\", \"Stoichiometry and dynamics of ζ-chain association unclear\", \"Whether ζ-chain association is required for inhibitory function untested\"]\n    },\n    {\n      \"year\": 1995,\n      \"claim\": \"Molecular cloning established KIR2DL3 as a member of the immunoglobulin superfamily with two extracellular Ig domains and a long cytoplasmic tail, and showed that inhibitory (p58) and activating (p50) KIR forms differ in cytoplasmic domain composition rather than glycosylation.\",\n      \"evidence\": \"cDNA cloning/sequencing, biochemical deglycosylation, 2D peptide mapping, calcium flux and cytotoxicity assays\",\n      \"pmids\": [\"7749980\", \"7650491\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Three-dimensional structure not yet determined\", \"Structural basis for activating vs inhibitory signaling unknown\"]\n    },\n    {\n      \"year\": 1995,\n      \"claim\": \"Coexpression of KIR2DL3 (GL183) and KIR2DL1 (EB6) on individual NK clones was shown to confer independent, additive inhibition against distinct HLA-C allotypes, and p70 (KIR3DL1) was demonstrated to be physically and functionally independent of p58, establishing that KIR receptors operate as non-redundant, independent modules.\",\n      \"evidence\": \"Co-immunoprecipitation, antibody blocking, cytotoxicity assays with HLA-C allele-specific transfectants\",\n      \"pmids\": [\"7724594\", \"8643653\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether KIR co-expression affects signaling thresholds quantitatively unknown\", \"Integration of signals from multiple KIR at the synapse not addressed\"]\n    },\n    {\n      \"year\": 1997,\n      \"claim\": \"The molecular determinants of HLA-C allotype specificity and binding affinity were identified: position 44 switches C1 vs C2 specificity, position 70 is critical for binding affinity, and KIR2DL3 binding to HLA-C is peptide-dependent with selectivity at peptide positions 7 and 8.\",\n      \"evidence\": \"Site-directed mutagenesis of KIR-Ig fusion proteins, direct binding assays to HLA-C transfectants and peptide-loaded TAP-deficient cells\",\n      \"pmids\": [\"9126959\", \"9464792\", \"9126935\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis for peptide selectivity at positions 7-8 not resolved\", \"Full spectrum of permissive vs non-permissive peptides unknown\"]\n    },\n    {\n      \"year\": 1998,\n      \"claim\": \"Kinetic analysis showed KIR2DL3 (p58) binds HLA-Cw7 with rapid on/off rates while the activating p50 counterpart binds weakly or not at all, localizing the binding difference to extracellular domain features rather than solely cytoplasmic regions.\",\n      \"evidence\": \"Quantitative binding assays comparing p58 and p50 receptor variants with HLA-Cw7\",\n      \"pmids\": [\"9826699\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Exact structural difference between p58 and p50 extracellular domains responsible for binding difference not pinpointed\"]\n    },\n    {\n      \"year\": 1999,\n      \"claim\": \"The crystal structure of KIR2DL3 revealed an unusually acute 23° interdomain hinge angle distinct from KIR2DL1, with the HLA-C binding site spanning both domains at the elbow, providing a structural framework for how domain orientation tunes ligand recognition.\",\n      \"evidence\": \"X-ray crystallography of KIR2DL3 extracellular region\",\n      \"pmids\": [\"10196125\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No co-crystal with HLA-C yet obtained\", \"Dynamic hinge movements not characterized\", \"How hinge angle relates to signaling strength not addressed\"]\n    },\n    {\n      \"year\": 1999,\n      \"claim\": \"Transgenic expression in T cells showed KIR2DL3 inhibitory signaling is context-dependent: it inhibits MLR and anti-CD3-redirected killing but cannot override strong antigen-driven CTL activation.\",\n      \"evidence\": \"KIR2DL3 transgenic mouse model with functional cytotoxicity and MLR assays\",\n      \"pmids\": [\"10498612\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Threshold of activation signal required to override KIR2DL3 inhibition not quantified\", \"Relevance of mouse transgenic system to human NK cell biology uncertain\", \"Signaling intermediates that are overridden not identified\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"The lower avidity of KIR2DL3 compared to KIR2DL2 was mapped to allosteric positions 16 and 148, distal to the ligand-binding interface, that synergistically modulate hinge angle and domain orientation rather than direct contact residues.\",\n      \"evidence\": \"Binding assays across 93 HLA isoforms combined with site-directed mutagenesis of recombinant KIR\",\n      \"pmids\": [\"18322206\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Exact hinge angle changes induced by positions 16 and 148 not measured structurally\", \"Whether these positions affect signaling dynamics beyond avidity unknown\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Systematic mutagenesis comprehensively mapped functional residue contributions: position 70 dominates avidity, position 44 governs C1/C2 specificity, and positions 71/131 control cross-reactivity with HLA-A*11:02, establishing KIR2DL3 as a lower-avidity but broader-specificity receptor than KIR2DL1.\",\n      \"evidence\": \"Systematic point mutagenesis at six positions with binding to 95 HLA allotypes\",\n      \"pmids\": [\"22772445\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Functional significance of HLA-A cross-reactivity in vivo unknown\", \"Whether avidity/specificity tradeoff is physiologically adaptive not tested\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"The KIR2DL3*005 allele achieves KIR2DL2-like binding affinity through allosteric residues Arg11 and Glu35 that alter the hinge angle, demonstrating that natural polymorphism uses the same allosteric mechanism to tune inhibitory strength.\",\n      \"evidence\": \"Surface plasmon resonance, mutagenesis, molecular modeling, primary NK cell functional assays\",\n      \"pmids\": [\"23686481\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Crystal structure of KIR2DL3*005 not obtained\", \"Population-level functional consequences of this allele not established\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Viral exploitation of peptide-dependent KIR2DL3 recognition was demonstrated: an HIV-1 Gag variant (T303V) selected in KIR2DL3+/HLA-C*03:04+ individuals enhances KIR2DL3 binding and suppresses NK activation, establishing peptide-mediated immune evasion.\",\n      \"evidence\": \"KIR2DL3-IgG fusion binding, primary NK cell functional assays, SPR, structural modeling, patient cohort data\",\n      \"pmids\": [\"26575988\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Whether this escape mechanism operates during acute vs chronic infection unclear\", \"Breadth of viral peptide variants exploiting this pathway not fully catalogued\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"HCV similarly exploits peptide-dependent KIR2DL3 modulation: an HCV core peptide bound to HLA-C*03:04 enhances KIR2DL3 binding and suppresses NK function, while genotype-specific sequence variation reduces inhibition, revealing convergent viral immune evasion across pathogens.\",\n      \"evidence\": \"KIR2DL3-IgG binding, HLA stabilization assay, primary NK cell functional assays\",\n      \"pmids\": [\"27057987\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis for peptide-dependent enhancement at the co-crystal level not determined for HCV peptides\", \"In vivo validation in HCV-infected patients not performed\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Co-crystal structures of KIR2DL2 and KIR2DL3 with HLA-C*07:02 revealed distinct docking modalities between the two receptors, providing the structural basis for their differential recognition of C1 allotypes and explaining why KIR2DS2 influences KIR2DL2 vs KIR2DL3 functional outcomes.\",\n      \"evidence\": \"X-ray crystallography of KIR/HLA-C complexes with mutagenesis and primary NK cell assays\",\n      \"pmids\": [\"33846289\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structures with diverse peptides not obtained\", \"How docking modality differences translate to signaling kinetics at the immune synapse not resolved\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"Key unresolved questions include how KIR2DL3 integrates inhibitory signaling at the immune synapse (role of ITIM-recruited phosphatases, signaling dynamics), the full repertoire of self and viral peptides that tune KIR2DL3 engagement, and how hinge-angle dynamics measured in solution relate to signaling strength in living NK cells.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Low\",\n      \"gaps\": [\"ITIM/SHP-1/SHP-2 signaling mechanism not directly characterized for KIR2DL3\", \"No comprehensive peptide-KIR2DL3-HLA-C structural survey exists\", \"Biophysical measurements of hinge dynamics in membrane-embedded KIR lacking\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [0, 14]},\n      {\"term_id\": \"GO:0060089\", \"supporting_discovery_ids\": [0, 5, 15, 16]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [0, 1, 9]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [0, 5, 14, 15, 16]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [3, 14]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\n      \"CD3Z\",\n      \"LCK\",\n      \"HLA-C\"\n    ],\n    \"other_free_text\": []\n  }\n}\n```"}