{"gene":"KIR3DL1","run_date":"2026-06-10T02:59:49","timeline":{"discoveries":[{"year":1994,"finding":"NKB1 (KIR3DL1) is a 70-kDa glycoprotein expressed on a subset of NK cells that functions as a receptor recognizing certain HLA-B alleles (e.g., HLA-B*5101 and B*5801); antibody blockade of NKB1 abrogated NK cell inhibition by these HLA-B transfectants, establishing NKB1 as the receptor mediating HLA-B recognition.","method":"Monoclonal antibody (DX9) blocking assays with HLA-B transfected target cells; biochemical characterization by SDS-PAGE","journal":"The Journal of experimental medicine","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal functional blocking with mAb on transfected targets, replicated across multiple HLA-B alleles, foundational paper","pmids":["8046332"],"is_preprint":false},{"year":1995,"finding":"The Bw4 epitope at residues 77–83 of HLA-B is necessary for inhibition of NKB1+ NK cells; HLA-B alleles carrying Bw4 (e.g., B*1513) but not Bw6 (B*1502) inhibited NKB1+ NK cell clones, and this inhibition was reversed by anti-NKB1 antibody. N-linked glycosylation at Asn86 of HLA-B is not required for KIR3DL1 recognition.","method":"NK cell cytotoxicity assays with HLA-B*1502/B*1513 transfectants differing only at Bw4/Bw6 region; site-directed mutagenesis of glycosylation site; antibody blocking","journal":"The Journal of experimental medicine","confidence":"High","confidence_rationale":"Tier 1 / Strong — mutagenesis combined with functional cytotoxicity assays and antibody blocking, multiple alleles tested","pmids":["7532677"],"is_preprint":false},{"year":1995,"finding":"KIR3DL1 (NKB1) was molecularly cloned; it encodes a 50-kDa protein (70 kDa glycosylated) with three extracellular Ig-like domains, placing it in the Ig superfamily related to the p58/NKAT inhibitory receptor family.","method":"cDNA library expression cloning using anti-NKB1 mAb DX9; SDS-PAGE with deglycosylation","journal":"Journal of immunology (Baltimore, Md. : 1950)","confidence":"High","confidence_rationale":"Tier 1 / Strong — expression cloning with functional antibody identification, biochemical characterization of molecular weight","pmids":["7650366"],"is_preprint":false},{"year":1996,"finding":"Phosphorylation of both tyrosines in the cytoplasmic ITIM motif (YxxL(x)26YxxL) of NKB1/KIR3DL1 is required for inhibitory signaling and for association with protein tyrosine phosphatase PTP1C (SHP-1); mutation of either tyrosine abolished inhibitory function and PTP1C binding, with the membrane-proximal tyrosine playing the more critical role.","method":"Tyrosine-to-phenylalanine mutagenesis of ITIM motif; co-immunoprecipitation of phosphorylated NKB1 with PTP1C; functional inhibition assay in Jurkat T cells","journal":"The Journal of experimental medicine","confidence":"High","confidence_rationale":"Tier 1 / Strong — mutagenesis combined with co-IP and functional assays, mechanistically definitive","pmids":["8691146"],"is_preprint":false},{"year":1995,"finding":"KIR3DL1 (NKB1) and the HLA-C receptor HP-3E4 are structurally distinct glycoproteins that independently recognize different polymorphic HLA molecules; a single NK clone can co-express both receptors, each functioning independently to inhibit cytolysis of targets expressing their respective HLA ligands.","method":"Co-expression studies on NK cell clones; dual antibody blocking of NKB1 and HP-3E4 on the same NK clone; cytotoxicity assays with HLA-B*5801 and HLA-Cw*0401 transfectants","journal":"Journal of immunology (Baltimore, Md. : 1950)","confidence":"High","confidence_rationale":"Tier 2 / Strong — reciprocal antibody blocking with defined HLA transfectants, multiple alleles and receptors tested","pmids":["7897214"],"is_preprint":false},{"year":1997,"finding":"KIR3DL1 (NKB1) interaction with HLA-B requires both conserved Bw4 residues (Leu82 and Arg83, which contribute but are not essential) and sequences outside the Bw4 region that distinguish HLA-B from HLA-A; HLA-A allotypes with an identical Bw4 motif do not inhibit NKB1+ NK cells.","method":"NK cell cytotoxicity assays with diverse HLA-B allotypes; point mutagenesis of Leu82 and Arg83 in HLA-B; comparison of HLA-A and HLA-B Bw4+ allotypes","journal":"Journal of immunology (Baltimore, Md. : 1950)","confidence":"High","confidence_rationale":"Tier 1 / Strong — mutagenesis of HLA ligand combined with functional inhibition assays, multiple allotypes across four HLA-B families","pmids":["9164941"],"is_preprint":false},{"year":1997,"finding":"HLA-G inhibits NK cell lysis through interaction with the NKAT3/KIR3DL1 receptor; inhibition by HLA-G was blocked by anti-NKAT3 antibody 5.133, and NK cell lines expressing NKAT3 were also inhibited by HLA-Bw4 molecules.","method":"Cytotoxicity assays with HLA-G transfected target cells; antibody blocking with anti-NKAT3 mAb","journal":"The Journal of experimental medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Weak — antibody blocking with HLA-G transfectants, single study but direct functional evidence","pmids":["9053439"],"is_preprint":false},{"year":2001,"finding":"KIR3DL1 allelic polymorphism determines NK cell surface expression levels; four positions in the protein (182 and 283 in extracellular Ig-like domains, 320 in the transmembrane region, and 373 in the cytoplasmic tail) distinguish high DX9-binding alleles from low/no-binding alleles. KIR3DS1 segregates as an allele of KIR3DL1.","method":"Family and population genetics; flow cytometry with DX9 and Z27 antibodies on NK cells from donors of defined KIR3DL1 genotype; NK cell clone analysis","journal":"Journal of immunology (Baltimore, Md. : 1950)","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — population genetics correlated with protein phenotype, specific residues identified, single lab","pmids":["11207248"],"is_preprint":false},{"year":2003,"finding":"Poor surface expression of KIR3DL1*004 is caused primarily by leucine at position 86 in the D0 Ig-like domain, which corrupts the WSXPS motif required for proper Ig-domain folding, causing intracellular retention; serine at position 182 in D1 makes a secondary additive contribution.","method":"Reciprocal point mutagenesis of 3DL1*004 and 3DL1*002 at positions 44, 86, and 182; Jurkat T cell transfection; flow cytometry for surface vs. intracellular expression","journal":"Journal of immunology (Baltimore, Md. : 1950)","confidence":"High","confidence_rationale":"Tier 1 / Strong — reciprocal site-directed mutagenesis with multiple mutants, functional expression readout","pmids":["14662867"],"is_preprint":false},{"year":2003,"finding":"The KIR3DL1 promoter drives variegated expression and is active in a range of cell types (unlike the KIR2DL4 promoter which is NK cell-specific); transcription factor binding sites differ between KIR3DL1 and KIR2DL4 promoters, indicating distinct regulatory mechanisms for variegated versus constitutive KIR expression.","method":"Reporter gene assays in NK and non-NK cell lines; DNase I footprinting of promoter regions; deletion analysis mapping maximum activity to ~270 bp upstream of translation start","journal":"Journal of immunology (Baltimore, Md. : 1950)","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — reporter assays plus DNase I footprinting, two orthogonal methods, single lab","pmids":["12794136"],"is_preprint":false},{"year":2005,"finding":"KIR3DL1 allele 3DL1*002 is a stronger inhibitory receptor for HLA-Bw4 ligands than 3DL1*007; residue 238 in the D2 domain and residue 320 in the transmembrane region contribute to the difference in inhibitory strength without directly contacting HLA-Bw4. KIR3DL1 and LILRB1 both contribute independently to inhibitory responses to HLA-Bw4.","method":"Retroviral transduction of human cell lines with 3DL1*002 and 3DL1*007; reciprocal point mutagenesis at positions 238 and 320; functional cytotoxicity assays","journal":"Journal of immunology (Baltimore, Md. : 1950)","confidence":"High","confidence_rationale":"Tier 1 / Strong — site-directed mutagenesis combined with functional inhibition assays in transduced cell lines","pmids":["16210627"],"is_preprint":false},{"year":2005,"finding":"Crystal structures of HLA-B*2705 complexed with three viral peptides show that KIR3DL1 binding to HLA-B*2705 is sensitive to the peptide presented; HLA-B*2705 complexes with HIV gag and flu NP peptides bound KIR3DL1 tetramers, while the EBV peptide complex did not; substitution of the solvent-exposed P8 glutamate of the EBV peptide to threonine restored KIR3DL1 recognition, implicating peptide P8 in KIR3DL1 binding.","method":"X-ray crystallography of HLA-B*2705-peptide complexes; KIR3DL1 tetramer binding assays; site-directed mutagenesis of peptide P8 residue","journal":"European journal of immunology","confidence":"High","confidence_rationale":"Tier 1 / Strong — crystal structure combined with mutagenesis and functional tetramer binding, multiple peptides tested","pmids":["15657948"],"is_preprint":false},{"year":2008,"finding":"HLA-A23 (A*2301), A24 (A*2402), and A32 (A*3201), but not A25 (A*2501), are functional ligands for KIR3DL1 and protect target cells from lysis by KIR3DL1+ NK cells; HLA-A25 differs at amino acid 90 near the Bw4 epitope from the other three Bw4+ HLA-A alleles.","method":"NK cell cytotoxicity assays with HLA-A transfected target cells; comparison of NK cells educated through HLA-A Bw4 vs. HLA-B Bw4","journal":"Blood","confidence":"High","confidence_rationale":"Tier 2 / Moderate — functional cytotoxicity assays with defined HLA transfectants, multiple alleles tested, mechanistically informative negative (A25)","pmids":["18502829"],"is_preprint":false},{"year":2010,"finding":"KIR3DL1*004, though predominantly misfolded and retained in the endoplasmic reticulum bound to the chaperone calreticulin, has a small fraction that folds correctly, reaches the cell surface, and can trigger NK cell inhibition and IFN-γ secretion suppression; no extensive intracellular interaction was detected between misfolded KIR3DL1*004 and cognate HLA-Bw4.","method":"Membrane traffic analysis in primary NK and transfected NKL cells; co-immunoprecipitation with calreticulin; flow cytometry for surface and intracellular KIR3DL1; functional NK inhibition assay; MHC class I co-immunoprecipitation","journal":"Journal of immunology (Baltimore, Md. : 1950)","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — co-IP with chaperone, functional assay, fractionation, multiple orthogonal methods in one study","pmids":["21115737"],"is_preprint":false},{"year":2010,"finding":"Promoter methylation of KIR3DL1 is significantly higher in patients with NK cell-type lymphoproliferative disease of granular lymphocytes than in healthy controls, resulting in near-complete loss of KIR3DL1 expression (expressed in 13% of patients vs. 90% of controls).","method":"RT-PCR for mRNA levels; methylation analysis of KIR3DL1 promoter; flow cytometry for surface expression","journal":"Haematologica","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — methylation analysis correlated with expression loss, two orthogonal methods, single lab","pmids":["20410181"],"is_preprint":false},{"year":2014,"finding":"KIR3DL1 residue 282 (glutamate) in the D2 domain determines rejection of negatively charged C-terminal peptide residues; residue 283, subject to positive selection, controls sensitivity to the HLA-bound peptide including HIV-1 Gag TW10 variant and influences Bw4 subtype recognition without directly contacting the peptide-HLA complex.","method":"Mutational analysis of KIR3DL1 at positions 282 and 283; NK cell functional assays with peptide-variant HLA complexes; allotypic KIR3DL1 variants tested","journal":"Journal of immunology (Baltimore, Md. : 1950)","confidence":"High","confidence_rationale":"Tier 1 / Moderate — mutagenesis combined with peptide-HLA recognition functional assays, multiple allotypes, single lab","pmids":["24563253"],"is_preprint":false},{"year":2015,"finding":"KIR3DS1-specific polymorphisms at positions 58 and 92 within the D0 domain of KIR3DL1 reduce surface expression and severely impair HLA-Bw4 binding; the allele KIR3DL1*009, which contains KIR3DS1-derived D0 polymorphisms, shows minimal HLA binding and reduced NK inhibitory function.","method":"Mutagenesis of KIR3DL1 at positions 58 and 92; flow cytometry on primary NK cells and transfected HEK293T cells; recombinant protein binding assays to HLA; NK cell functional inhibition assays","journal":"Journal of immunology (Baltimore, Md. : 1950)","confidence":"High","confidence_rationale":"Tier 1 / Strong — mutagenesis, recombinant protein binding assays, primary cell phenotyping, and functional assays in one study","pmids":["26109640"],"is_preprint":false},{"year":2015,"finding":"A dengue virus NS1-derived peptide complexed with HLA-B57 binds the inhibitory receptor KIR3DL1 on CD56dim NK cells; this was demonstrated using KIR-transfected cell lines and depletion studies, with KIR3DL1-binding NK cells showing activation during acute dengue disease.","method":"Tetramer binding assays to NK cells; KIR-transfected cell lines; depletion studies; flow cytometry phenotyping of PBMC from HLA-B57+ donors","journal":"Clinical and experimental immunology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — KIR-transfected cell lines plus primary cell depletion studies, two orthogonal approaches, single lab","pmids":["26439909"],"is_preprint":false},{"year":2016,"finding":"KIR3DL1 surface density and HLA-Bw4 density together calibrate NK cell education and reactive potential; high-density KIR3DL1 combined with Bw4-80I HLA-B bestows the greatest NK reactivity against HLA-negative targets and HIV-infected autologous CD4+ T cells, demonstrating that both receptor and ligand allelic density are functionally important.","method":"Primary NK cell functional assays (cytotoxicity against HLA-negative targets and HIV-infected CD4+ T cells); KIR3DL1 surface density measurement by flow cytometry; HLA-Bw4 membrane density analysis; correlation of KIR3DL1/HLA-B subtype combinations with NK reactivity","journal":"Journal of immunology (Baltimore, Md. : 1950)","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — primary cell functional assays with multiple KIR3DL1/HLA-B subtype combinations, single lab, multiple orthogonal endpoints","pmids":["26962229"],"is_preprint":false},{"year":2019,"finding":"CD8αα homodimers function as a coreceptor for KIR3DL1: CD8αα enhances binding of pMHC-I to KIR3DL1, increases KIR3DL1 clustering at the immunological synapse, and augments KIR3DL1-mediated inhibition of NK cell activation; CD8αα-pMHC-I interactions also regulate KIR3DL1+ NK cell education.","method":"Binding assays with recombinant proteins; live cell imaging of KIR3DL1 clustering at the immunological synapse; NK cell activation assays with CD8αα knockout/expression manipulation; NK cell education analysis","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — binding assays, live imaging, and functional NK activation assays in one study, multiple orthogonal methods","pmids":["31420518"],"is_preprint":false},{"year":2019,"finding":"The KIR3DL1 cytoplasmic region is intrinsically disordered; segment II (M352–D371) can adopt a loop-like conformation and segments I and III can form dynamic helices that may mediate membrane binding near the N-terminal ITIM. Individual SH2 domains of SHP-2 bind the unphosphorylated N-ITIM, while tandem SHP-2 SH2 domains binding bis-phosphorylated ITIMs cause more extensive conformational changes in segments I and III.","method":"NMR spectroscopy of the KIR3DL1 cytoplasmic region; binding studies with individual and tandem SHP-2 SH2 domains; phosphopeptide-based interaction assays","journal":"Structure (London, England : 1993)","confidence":"High","confidence_rationale":"Tier 1 / Moderate — NMR structural study combined with direct SHP-2 binding measurements, single lab but high-quality structural methods","pmids":["30773397"],"is_preprint":false},{"year":2021,"finding":"ERAP1 inhibition in tumor cells reduces the ability of HLA-B*51:01 to engage KIR3DL1, leading to increased NK cell degranulation and cytotoxicity specifically in KIR3DL1+ NK cells; pharmacological or genetic inhibition of ERAP1 impairs HLA-B*51:01 recognition by KIR3DL1, identifying HLA-B*51:01/KIR3DL1 as a susceptible combination for ERAP1-based immunotherapy.","method":"Stable ERAP1 knockdown in 721.221 cells transfected with HLA class I; CD107a expression assays on NK cells; KIR3DL1-overexpressing YTS NK cell line; pharmacological ERAP1 inhibition","journal":"Frontiers in immunology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic and pharmacological ERAP1 inhibition combined with KIR3DL1+ NK cell functional assays, single lab","pmids":["34917091"],"is_preprint":false},{"year":2015,"finding":"ERAP1 polymorphisms associated with ankylosing spondylitis (R528 and E730) reduce KIR3DL1 affinity for HLA-B27 by generating sub-optimal peptide-HLA complexes; both classical peptide-HLA (pHLA) and free heavy chain (FHC) conformers of HLA-B27 inhibit NK cell cytokine production through KIR3DL1, and antibody cross-linking of HLA-B27 enhances KIR3DL1 binding.","method":"APC-NK cell co-culture adhesion and cytokine assays; KIR3DL1 affinity measurements; blocking of pHLA and FHC with specific antibodies; ERAP1 variant-expressing cell lines","journal":"Discovery medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional NK assays with ERAP1 variant APCs plus affinity measurements, single lab, multiple readouts","pmids":["26321090"],"is_preprint":false}],"current_model":"KIR3DL1 is a polymorphic inhibitory NK cell receptor with three extracellular Ig-like domains that recognizes the Bw4 epitope of HLA-B (and select HLA-A) allotypes; upon ligand binding, its cytoplasmic ITIM motif is phosphorylated on both tyrosines and recruits SHP-1/SHP-2 phosphatases (confirmed by NMR structural analysis of cytoplasmic conformational changes upon SHP-2 engagement), thereby suppressing NK cell cytotoxicity and cytokine production; allotypic polymorphisms throughout the receptor modulate surface expression (critical residues at positions 86 in D0 and 182 in D1 controlling ER retention), HLA-Bw4 binding affinity (D2 residues 238, 282, 283), and sensitivity to HLA-presented peptides, while CD8αα homodimers serve as coreceptors that enhance pMHC-I binding to KIR3DL1 and augment inhibitory signaling at the immunological synapse."},"narrative":{"mechanistic_narrative":"KIR3DL1 is a polymorphic inhibitory NK cell receptor that monitors HLA class I expression on target cells and restrains NK cytotoxicity and cytokine production [PMID:8046332, PMID:8691146]. Identified as the NK surface glycoprotein NKB1, it recognizes specific HLA-B allotypes and its antibody blockade abolishes HLA-B-mediated NK inhibition [PMID:8046332]; molecular cloning placed it in the Ig superfamily with three extracellular Ig-like domains [PMID:7650366]. Ligand specificity is governed by the Bw4 epitope at HLA-B residues 77–83, together with sequences outside Bw4 that distinguish HLA-B from HLA-A, so that only select Bw4-bearing HLA-A allotypes (A23, A24, A32, but not A25) also serve as ligands [PMID:7532677, PMID:9164941, PMID:18502829]; HLA-G is an additional recognized ligand [PMID:9053439]. Recognition is intrinsically peptide-sensitive: the identity of the HLA-presented peptide, particularly its solvent-exposed C-terminal positions, determines whether KIR3DL1 engages the peptide-HLA complex [PMID:15657948, PMID:24563253], and peptide trimming by ERAP1 tunes this engagement [PMID:34917091, PMID:26321090]. Upon ligand binding, both tyrosines of the cytoplasmic ITIM are phosphorylated and recruit the tyrosine phosphatase SHP-1/PTP1C, which is required for inhibitory signaling [PMID:8691146]; the cytoplasmic region is intrinsically disordered and undergoes conformational change when its bis-phosphorylated ITIMs engage the tandem SH2 domains of SHP-2 [PMID:30773397]. CD8αα homodimers act as a coreceptor that enhances pMHC-I binding, promotes KIR3DL1 clustering at the immunological synapse, and augments inhibition and NK education [PMID:31420518]. Extensive allotypic polymorphism modulates receptor surface density and folding—position 86 in D0 controlling ER retention via the WSXPS folding motif [PMID:14662867], positions 58/92 in D0 impairing expression and HLA binding [PMID:26109640]—as well as inhibitory strength and Bw4 binding affinity through D2 residues 238, 282, and 283 [PMID:16210627, PMID:24563253], with receptor and ligand density jointly calibrating NK education and reactivity [PMID:26962229].","teleology":[{"year":1994,"claim":"Established that a defined NK surface glycoprotein, NKB1, is the receptor responsible for HLA-B-mediated inhibition, converting a phenomenological observation into a molecular receptor.","evidence":"DX9 mAb blocking of NK inhibition by HLA-B transfectants plus biochemical characterization","pmids":["8046332"],"confidence":"High","gaps":["Receptor gene not yet cloned","HLA epitope recognized not yet mapped"]},{"year":1995,"claim":"Cloned the receptor and mapped its HLA recognition to the Bw4 epitope, defining both the molecular identity and the ligand determinant.","evidence":"Expression cloning with DX9 mAb; cytotoxicity assays with Bw4/Bw6-differing HLA-B transfectants and glycosylation-site mutagenesis","pmids":["7650366","7532677"],"confidence":"High","gaps":["Contribution of non-Bw4 HLA sequences unresolved","Signaling mechanism unknown"]},{"year":1995,"claim":"Showed that KIR3DL1 and the HLA-C receptor act as independent inhibitory receptors co-expressible on one NK clone, establishing combinatorial HLA surveillance.","evidence":"Dual antibody blocking and cytotoxicity assays on single NK clones with distinct HLA transfectants","pmids":["7897214"],"confidence":"High","gaps":["Does not address signaling crosstalk between receptors"]},{"year":1996,"claim":"Defined the inhibitory signaling mechanism by showing both ITIM tyrosines must be phosphorylated to recruit the phosphatase PTP1C/SHP-1.","evidence":"Tyrosine-to-phenylalanine ITIM mutagenesis, co-IP with PTP1C, functional assays in Jurkat","pmids":["8691146"],"confidence":"High","gaps":["Structural basis of phosphatase engagement not resolved","Role of SHP-2 not addressed"]},{"year":1997,"claim":"Refined ligand specificity, showing Bw4 residues contribute but additional HLA-B-specific sequences are required, and identified HLA-G as a ligand.","evidence":"HLA-B point mutagenesis (Leu82/Arg83), HLA-A vs HLA-B comparison, and anti-NKAT3 blocking with HLA-G transfectants","pmids":["9164941","9053439"],"confidence":"Medium","gaps":["Structural mode of HLA-A versus HLA-B discrimination unknown","HLA-G interaction shown in single study"]},{"year":2003,"claim":"Established the molecular basis of allotype-specific surface expression, linking D0 residue 86 to folding and ER retention and identifying distinct promoter regulation.","evidence":"Reciprocal point mutagenesis with surface/intracellular flow cytometry; reporter assays and DNase I footprinting of the promoter","pmids":["14662867","12794136"],"confidence":"High","gaps":["Folding chaperone partners not yet identified","Determinants of variegated expression incompletely mapped"]},{"year":2005,"claim":"Showed that allotypic residues outside the HLA contact surface (238, 320) tune inhibitory strength, separating binding affinity from signaling potency.","evidence":"Retroviral transduction of allotypes, reciprocal mutagenesis, cytotoxicity assays","pmids":["16210627"],"confidence":"High","gaps":["Mechanism by which non-contact residues alter inhibition unknown"]},{"year":2005,"claim":"Demonstrated that KIR3DL1 recognition is sensitive to the specific peptide presented by HLA, with peptide P8 implicated as a key determinant.","evidence":"X-ray crystallography of HLA-B*2705-peptide complexes with KIR3DL1 tetramer binding and peptide mutagenesis","pmids":["15657948"],"confidence":"High","gaps":["No co-crystal of KIR3DL1 with pHLA","Generalizability across HLA allotypes untested here"]},{"year":2008,"claim":"Extended the functional ligand repertoire to specific Bw4+ HLA-A allotypes and pinpointed residue 90 as discriminating a non-ligand.","evidence":"Cytotoxicity assays with HLA-A transfectants and NK education comparisons","pmids":["18502829"],"confidence":"High","gaps":["Structural basis of residue 90 effect not resolved"]},{"year":2010,"claim":"Clarified the fate of poorly expressed allotypes, showing 3DL1*004 is largely ER-retained on calreticulin yet a folded fraction is functional.","evidence":"Membrane traffic analysis, calreticulin co-IP, functional NK inhibition assays","pmids":["21115737"],"confidence":"High","gaps":["Quantitative folding efficiency across allotypes not defined"]},{"year":2010,"claim":"Linked epigenetic silencing of KIR3DL1 to a disease state, showing promoter hypermethylation drives loss of expression in NK-cell lymphoproliferative disease.","evidence":"RT-PCR, promoter methylation analysis, and flow cytometry in patients versus controls","pmids":["20410181"],"confidence":"Medium","gaps":["Causal versus correlative role of methylation not established","Single-cohort observation"]},{"year":2014,"claim":"Mapped D2 residues 282 and 283 as determinants of peptide selectivity, explaining how the receptor reads HLA-bound peptide without directly contacting it.","evidence":"Mutagenesis at positions 282/283 and NK functional assays with peptide-variant HLA","pmids":["24563253"],"confidence":"High","gaps":["Structural mechanism of indirect peptide sensing unresolved"]},{"year":2015,"claim":"Showed KIR3DS1-derived D0 polymorphisms (58, 92) impair both expression and HLA binding, distinguishing the inhibitory and activating receptor lineages functionally.","evidence":"Mutagenesis, recombinant HLA binding assays, primary NK phenotyping, functional inhibition","pmids":["26109640"],"confidence":"High","gaps":["Ligand of activating KIR3DS1 not defined here"]},{"year":2015,"claim":"Identified ERAP1-dependent peptide trimming as an upstream modulator of KIR3DL1 engagement and showed viral-peptide-loaded HLA can directly bind the receptor.","evidence":"ERAP1-variant APC co-cultures with affinity and cytokine assays; tetramer/transfectant assays with dengue NS1 peptide-HLA-B57","pmids":["26321090","26439909"],"confidence":"Medium","gaps":["Direct structural impact of trimmed peptides not resolved","Single-lab functional data"]},{"year":2016,"claim":"Established that receptor and ligand surface density jointly calibrate NK education and reactive potential, integrating allotype effects into a quantitative framework.","evidence":"Primary NK functional assays across KIR3DL1/HLA-B subtype combinations with density measurements","pmids":["26962229"],"confidence":"Medium","gaps":["Molecular basis of density-dependent education unknown"]},{"year":2019,"claim":"Defined CD8αα as a coreceptor that enhances pMHC-I binding, synaptic clustering, and inhibition, and showed it regulates NK education.","evidence":"Recombinant binding assays, live-cell synapse imaging, NK activation assays with CD8αα manipulation","pmids":["31420518"],"confidence":"High","gaps":["Structural basis of the CD8αα-KIR3DL1-pMHC ternary arrangement undefined"]},{"year":2019,"claim":"Provided a structural view of the cytoplasmic ITIM region, showing it is intrinsically disordered and reorganizes upon tandem SHP-2 SH2 engagement of bis-phosphorylated ITIMs.","evidence":"NMR spectroscopy of the cytoplasmic region with individual and tandem SHP-2 SH2 binding studies","pmids":["30773397"],"confidence":"High","gaps":["Full-length signaling complex not structurally resolved","Functional consequence of membrane-binding segments untested"]},{"year":2021,"claim":"Demonstrated therapeutic relevance by showing ERAP1 inhibition disrupts HLA-B*51:01/KIR3DL1 engagement and unleashes KIR3DL1+ NK cytotoxicity.","evidence":"ERAP1 knockdown and pharmacological inhibition with KIR3DL1+ NK degranulation/cytotoxicity assays","pmids":["34917091"],"confidence":"Medium","gaps":["In vivo efficacy not established","Breadth across HLA allotypes not defined"]},{"year":null,"claim":"How peptide-driven, ERAP1-shaped HLA conformers and the CD8αα coreceptor are structurally integrated at the synapse to set the threshold for SHP-mediated inhibition remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No ternary structure of KIR3DL1-pHLA-CD8αα","Quantitative link between binding affinity, density, and signal output incomplete"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0001618","term_label":"virus receptor activity","supporting_discovery_ids":[0,1,5,6,11,12]},{"term_id":"GO:0060089","term_label":"molecular transducer activity","supporting_discovery_ids":[0,3]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[3,19]},{"term_id":"GO:0005198","term_label":"structural molecule activity","supporting_discovery_ids":[2]}],"localization":[{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[0,2,7,19]},{"term_id":"GO:0005783","term_label":"endoplasmic reticulum","supporting_discovery_ids":[8,13]}],"pathway":[{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[0,3,18]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[3,20]}],"complexes":[],"partners":["HLA-B","HLA-A","HLA-G","SHP-1","SHP-2","CD8A","CALRETICULIN"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"P43629","full_name":"Killer cell immunoglobulin-like receptor 3DL1","aliases":["CD158 antigen-like family member E","HLA-BW4-specific inhibitory NK cell receptor","Natural killer-associated transcript 3","NKAT-3","p70 natural killer cell receptor clones CL-2/CL-11","p70 NK receptor CL-2/CL-11"],"length_aa":444,"mass_kda":49.1,"function":"Receptor on natural killer (NK) cells for HLA Bw4 allele. 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blocking assays with HLA-B transfected target cells; biochemical characterization by SDS-PAGE\",\n      \"journal\": \"The Journal of experimental medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal functional blocking with mAb on transfected targets, replicated across multiple HLA-B alleles, foundational paper\",\n      \"pmids\": [\"8046332\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1995,\n      \"finding\": \"The Bw4 epitope at residues 77–83 of HLA-B is necessary for inhibition of NKB1+ NK cells; HLA-B alleles carrying Bw4 (e.g., B*1513) but not Bw6 (B*1502) inhibited NKB1+ NK cell clones, and this inhibition was reversed by anti-NKB1 antibody. N-linked glycosylation at Asn86 of HLA-B is not required for KIR3DL1 recognition.\",\n      \"method\": \"NK cell cytotoxicity assays with HLA-B*1502/B*1513 transfectants differing only at Bw4/Bw6 region; site-directed mutagenesis of glycosylation site; antibody blocking\",\n      \"journal\": \"The Journal of experimental medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — mutagenesis combined with functional cytotoxicity assays and antibody blocking, multiple alleles tested\",\n      \"pmids\": [\"7532677\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1995,\n      \"finding\": \"KIR3DL1 (NKB1) was molecularly cloned; it encodes a 50-kDa protein (70 kDa glycosylated) with three extracellular Ig-like domains, placing it in the Ig superfamily related to the p58/NKAT inhibitory receptor family.\",\n      \"method\": \"cDNA library expression cloning using anti-NKB1 mAb DX9; SDS-PAGE with deglycosylation\",\n      \"journal\": \"Journal of immunology (Baltimore, Md. : 1950)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — expression cloning with functional antibody identification, biochemical characterization of molecular weight\",\n      \"pmids\": [\"7650366\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1996,\n      \"finding\": \"Phosphorylation of both tyrosines in the cytoplasmic ITIM motif (YxxL(x)26YxxL) of NKB1/KIR3DL1 is required for inhibitory signaling and for association with protein tyrosine phosphatase PTP1C (SHP-1); mutation of either tyrosine abolished inhibitory function and PTP1C binding, with the membrane-proximal tyrosine playing the more critical role.\",\n      \"method\": \"Tyrosine-to-phenylalanine mutagenesis of ITIM motif; co-immunoprecipitation of phosphorylated NKB1 with PTP1C; functional inhibition assay in Jurkat T cells\",\n      \"journal\": \"The Journal of experimental medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — mutagenesis combined with co-IP and functional assays, mechanistically definitive\",\n      \"pmids\": [\"8691146\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1995,\n      \"finding\": \"KIR3DL1 (NKB1) and the HLA-C receptor HP-3E4 are structurally distinct glycoproteins that independently recognize different polymorphic HLA molecules; a single NK clone can co-express both receptors, each functioning independently to inhibit cytolysis of targets expressing their respective HLA ligands.\",\n      \"method\": \"Co-expression studies on NK cell clones; dual antibody blocking of NKB1 and HP-3E4 on the same NK clone; cytotoxicity assays with HLA-B*5801 and HLA-Cw*0401 transfectants\",\n      \"journal\": \"Journal of immunology (Baltimore, Md. : 1950)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — reciprocal antibody blocking with defined HLA transfectants, multiple alleles and receptors tested\",\n      \"pmids\": [\"7897214\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1997,\n      \"finding\": \"KIR3DL1 (NKB1) interaction with HLA-B requires both conserved Bw4 residues (Leu82 and Arg83, which contribute but are not essential) and sequences outside the Bw4 region that distinguish HLA-B from HLA-A; HLA-A allotypes with an identical Bw4 motif do not inhibit NKB1+ NK cells.\",\n      \"method\": \"NK cell cytotoxicity assays with diverse HLA-B allotypes; point mutagenesis of Leu82 and Arg83 in HLA-B; comparison of HLA-A and HLA-B Bw4+ allotypes\",\n      \"journal\": \"Journal of immunology (Baltimore, Md. : 1950)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — mutagenesis of HLA ligand combined with functional inhibition assays, multiple allotypes across four HLA-B families\",\n      \"pmids\": [\"9164941\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1997,\n      \"finding\": \"HLA-G inhibits NK cell lysis through interaction with the NKAT3/KIR3DL1 receptor; inhibition by HLA-G was blocked by anti-NKAT3 antibody 5.133, and NK cell lines expressing NKAT3 were also inhibited by HLA-Bw4 molecules.\",\n      \"method\": \"Cytotoxicity assays with HLA-G transfected target cells; antibody blocking with anti-NKAT3 mAb\",\n      \"journal\": \"The Journal of experimental medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Weak — antibody blocking with HLA-G transfectants, single study but direct functional evidence\",\n      \"pmids\": [\"9053439\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"KIR3DL1 allelic polymorphism determines NK cell surface expression levels; four positions in the protein (182 and 283 in extracellular Ig-like domains, 320 in the transmembrane region, and 373 in the cytoplasmic tail) distinguish high DX9-binding alleles from low/no-binding alleles. KIR3DS1 segregates as an allele of KIR3DL1.\",\n      \"method\": \"Family and population genetics; flow cytometry with DX9 and Z27 antibodies on NK cells from donors of defined KIR3DL1 genotype; NK cell clone analysis\",\n      \"journal\": \"Journal of immunology (Baltimore, Md. : 1950)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — population genetics correlated with protein phenotype, specific residues identified, single lab\",\n      \"pmids\": [\"11207248\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Poor surface expression of KIR3DL1*004 is caused primarily by leucine at position 86 in the D0 Ig-like domain, which corrupts the WSXPS motif required for proper Ig-domain folding, causing intracellular retention; serine at position 182 in D1 makes a secondary additive contribution.\",\n      \"method\": \"Reciprocal point mutagenesis of 3DL1*004 and 3DL1*002 at positions 44, 86, and 182; Jurkat T cell transfection; flow cytometry for surface vs. intracellular expression\",\n      \"journal\": \"Journal of immunology (Baltimore, Md. : 1950)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — reciprocal site-directed mutagenesis with multiple mutants, functional expression readout\",\n      \"pmids\": [\"14662867\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"The KIR3DL1 promoter drives variegated expression and is active in a range of cell types (unlike the KIR2DL4 promoter which is NK cell-specific); transcription factor binding sites differ between KIR3DL1 and KIR2DL4 promoters, indicating distinct regulatory mechanisms for variegated versus constitutive KIR expression.\",\n      \"method\": \"Reporter gene assays in NK and non-NK cell lines; DNase I footprinting of promoter regions; deletion analysis mapping maximum activity to ~270 bp upstream of translation start\",\n      \"journal\": \"Journal of immunology (Baltimore, Md. : 1950)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reporter assays plus DNase I footprinting, two orthogonal methods, single lab\",\n      \"pmids\": [\"12794136\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"KIR3DL1 allele 3DL1*002 is a stronger inhibitory receptor for HLA-Bw4 ligands than 3DL1*007; residue 238 in the D2 domain and residue 320 in the transmembrane region contribute to the difference in inhibitory strength without directly contacting HLA-Bw4. KIR3DL1 and LILRB1 both contribute independently to inhibitory responses to HLA-Bw4.\",\n      \"method\": \"Retroviral transduction of human cell lines with 3DL1*002 and 3DL1*007; reciprocal point mutagenesis at positions 238 and 320; functional cytotoxicity assays\",\n      \"journal\": \"Journal of immunology (Baltimore, Md. : 1950)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — site-directed mutagenesis combined with functional inhibition assays in transduced cell lines\",\n      \"pmids\": [\"16210627\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2005,\n      \"finding\": \"Crystal structures of HLA-B*2705 complexed with three viral peptides show that KIR3DL1 binding to HLA-B*2705 is sensitive to the peptide presented; HLA-B*2705 complexes with HIV gag and flu NP peptides bound KIR3DL1 tetramers, while the EBV peptide complex did not; substitution of the solvent-exposed P8 glutamate of the EBV peptide to threonine restored KIR3DL1 recognition, implicating peptide P8 in KIR3DL1 binding.\",\n      \"method\": \"X-ray crystallography of HLA-B*2705-peptide complexes; KIR3DL1 tetramer binding assays; site-directed mutagenesis of peptide P8 residue\",\n      \"journal\": \"European journal of immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crystal structure combined with mutagenesis and functional tetramer binding, multiple peptides tested\",\n      \"pmids\": [\"15657948\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"HLA-A23 (A*2301), A24 (A*2402), and A32 (A*3201), but not A25 (A*2501), are functional ligands for KIR3DL1 and protect target cells from lysis by KIR3DL1+ NK cells; HLA-A25 differs at amino acid 90 near the Bw4 epitope from the other three Bw4+ HLA-A alleles.\",\n      \"method\": \"NK cell cytotoxicity assays with HLA-A transfected target cells; comparison of NK cells educated through HLA-A Bw4 vs. HLA-B Bw4\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional cytotoxicity assays with defined HLA transfectants, multiple alleles tested, mechanistically informative negative (A25)\",\n      \"pmids\": [\"18502829\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"KIR3DL1*004, though predominantly misfolded and retained in the endoplasmic reticulum bound to the chaperone calreticulin, has a small fraction that folds correctly, reaches the cell surface, and can trigger NK cell inhibition and IFN-γ secretion suppression; no extensive intracellular interaction was detected between misfolded KIR3DL1*004 and cognate HLA-Bw4.\",\n      \"method\": \"Membrane traffic analysis in primary NK and transfected NKL cells; co-immunoprecipitation with calreticulin; flow cytometry for surface and intracellular KIR3DL1; functional NK inhibition assay; MHC class I co-immunoprecipitation\",\n      \"journal\": \"Journal of immunology (Baltimore, Md. : 1950)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — co-IP with chaperone, functional assay, fractionation, multiple orthogonal methods in one study\",\n      \"pmids\": [\"21115737\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Promoter methylation of KIR3DL1 is significantly higher in patients with NK cell-type lymphoproliferative disease of granular lymphocytes than in healthy controls, resulting in near-complete loss of KIR3DL1 expression (expressed in 13% of patients vs. 90% of controls).\",\n      \"method\": \"RT-PCR for mRNA levels; methylation analysis of KIR3DL1 promoter; flow cytometry for surface expression\",\n      \"journal\": \"Haematologica\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — methylation analysis correlated with expression loss, two orthogonal methods, single lab\",\n      \"pmids\": [\"20410181\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"KIR3DL1 residue 282 (glutamate) in the D2 domain determines rejection of negatively charged C-terminal peptide residues; residue 283, subject to positive selection, controls sensitivity to the HLA-bound peptide including HIV-1 Gag TW10 variant and influences Bw4 subtype recognition without directly contacting the peptide-HLA complex.\",\n      \"method\": \"Mutational analysis of KIR3DL1 at positions 282 and 283; NK cell functional assays with peptide-variant HLA complexes; allotypic KIR3DL1 variants tested\",\n      \"journal\": \"Journal of immunology (Baltimore, Md. : 1950)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — mutagenesis combined with peptide-HLA recognition functional assays, multiple allotypes, single lab\",\n      \"pmids\": [\"24563253\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"KIR3DS1-specific polymorphisms at positions 58 and 92 within the D0 domain of KIR3DL1 reduce surface expression and severely impair HLA-Bw4 binding; the allele KIR3DL1*009, which contains KIR3DS1-derived D0 polymorphisms, shows minimal HLA binding and reduced NK inhibitory function.\",\n      \"method\": \"Mutagenesis of KIR3DL1 at positions 58 and 92; flow cytometry on primary NK cells and transfected HEK293T cells; recombinant protein binding assays to HLA; NK cell functional inhibition assays\",\n      \"journal\": \"Journal of immunology (Baltimore, Md. : 1950)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — mutagenesis, recombinant protein binding assays, primary cell phenotyping, and functional assays in one study\",\n      \"pmids\": [\"26109640\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"A dengue virus NS1-derived peptide complexed with HLA-B57 binds the inhibitory receptor KIR3DL1 on CD56dim NK cells; this was demonstrated using KIR-transfected cell lines and depletion studies, with KIR3DL1-binding NK cells showing activation during acute dengue disease.\",\n      \"method\": \"Tetramer binding assays to NK cells; KIR-transfected cell lines; depletion studies; flow cytometry phenotyping of PBMC from HLA-B57+ donors\",\n      \"journal\": \"Clinical and experimental immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — KIR-transfected cell lines plus primary cell depletion studies, two orthogonal approaches, single lab\",\n      \"pmids\": [\"26439909\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"KIR3DL1 surface density and HLA-Bw4 density together calibrate NK cell education and reactive potential; high-density KIR3DL1 combined with Bw4-80I HLA-B bestows the greatest NK reactivity against HLA-negative targets and HIV-infected autologous CD4+ T cells, demonstrating that both receptor and ligand allelic density are functionally important.\",\n      \"method\": \"Primary NK cell functional assays (cytotoxicity against HLA-negative targets and HIV-infected CD4+ T cells); KIR3DL1 surface density measurement by flow cytometry; HLA-Bw4 membrane density analysis; correlation of KIR3DL1/HLA-B subtype combinations with NK reactivity\",\n      \"journal\": \"Journal of immunology (Baltimore, Md. : 1950)\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — primary cell functional assays with multiple KIR3DL1/HLA-B subtype combinations, single lab, multiple orthogonal endpoints\",\n      \"pmids\": [\"26962229\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"CD8αα homodimers function as a coreceptor for KIR3DL1: CD8αα enhances binding of pMHC-I to KIR3DL1, increases KIR3DL1 clustering at the immunological synapse, and augments KIR3DL1-mediated inhibition of NK cell activation; CD8αα-pMHC-I interactions also regulate KIR3DL1+ NK cell education.\",\n      \"method\": \"Binding assays with recombinant proteins; live cell imaging of KIR3DL1 clustering at the immunological synapse; NK cell activation assays with CD8αα knockout/expression manipulation; NK cell education analysis\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — binding assays, live imaging, and functional NK activation assays in one study, multiple orthogonal methods\",\n      \"pmids\": [\"31420518\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"The KIR3DL1 cytoplasmic region is intrinsically disordered; segment II (M352–D371) can adopt a loop-like conformation and segments I and III can form dynamic helices that may mediate membrane binding near the N-terminal ITIM. Individual SH2 domains of SHP-2 bind the unphosphorylated N-ITIM, while tandem SHP-2 SH2 domains binding bis-phosphorylated ITIMs cause more extensive conformational changes in segments I and III.\",\n      \"method\": \"NMR spectroscopy of the KIR3DL1 cytoplasmic region; binding studies with individual and tandem SHP-2 SH2 domains; phosphopeptide-based interaction assays\",\n      \"journal\": \"Structure (London, England : 1993)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — NMR structural study combined with direct SHP-2 binding measurements, single lab but high-quality structural methods\",\n      \"pmids\": [\"30773397\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"ERAP1 inhibition in tumor cells reduces the ability of HLA-B*51:01 to engage KIR3DL1, leading to increased NK cell degranulation and cytotoxicity specifically in KIR3DL1+ NK cells; pharmacological or genetic inhibition of ERAP1 impairs HLA-B*51:01 recognition by KIR3DL1, identifying HLA-B*51:01/KIR3DL1 as a susceptible combination for ERAP1-based immunotherapy.\",\n      \"method\": \"Stable ERAP1 knockdown in 721.221 cells transfected with HLA class I; CD107a expression assays on NK cells; KIR3DL1-overexpressing YTS NK cell line; pharmacological ERAP1 inhibition\",\n      \"journal\": \"Frontiers in immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic and pharmacological ERAP1 inhibition combined with KIR3DL1+ NK cell functional assays, single lab\",\n      \"pmids\": [\"34917091\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2015,\n      \"finding\": \"ERAP1 polymorphisms associated with ankylosing spondylitis (R528 and E730) reduce KIR3DL1 affinity for HLA-B27 by generating sub-optimal peptide-HLA complexes; both classical peptide-HLA (pHLA) and free heavy chain (FHC) conformers of HLA-B27 inhibit NK cell cytokine production through KIR3DL1, and antibody cross-linking of HLA-B27 enhances KIR3DL1 binding.\",\n      \"method\": \"APC-NK cell co-culture adhesion and cytokine assays; KIR3DL1 affinity measurements; blocking of pHLA and FHC with specific antibodies; ERAP1 variant-expressing cell lines\",\n      \"journal\": \"Discovery medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional NK assays with ERAP1 variant APCs plus affinity measurements, single lab, multiple readouts\",\n      \"pmids\": [\"26321090\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"KIR3DL1 is a polymorphic inhibitory NK cell receptor with three extracellular Ig-like domains that recognizes the Bw4 epitope of HLA-B (and select HLA-A) allotypes; upon ligand binding, its cytoplasmic ITIM motif is phosphorylated on both tyrosines and recruits SHP-1/SHP-2 phosphatases (confirmed by NMR structural analysis of cytoplasmic conformational changes upon SHP-2 engagement), thereby suppressing NK cell cytotoxicity and cytokine production; allotypic polymorphisms throughout the receptor modulate surface expression (critical residues at positions 86 in D0 and 182 in D1 controlling ER retention), HLA-Bw4 binding affinity (D2 residues 238, 282, 283), and sensitivity to HLA-presented peptides, while CD8αα homodimers serve as coreceptors that enhance pMHC-I binding to KIR3DL1 and augment inhibitory signaling at the immunological synapse.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"KIR3DL1 is a polymorphic inhibitory NK cell receptor that monitors HLA class I expression on target cells and restrains NK cytotoxicity and cytokine production [#0, #3]. Identified as the NK surface glycoprotein NKB1, it recognizes specific HLA-B allotypes and its antibody blockade abolishes HLA-B-mediated NK inhibition [#0]; molecular cloning placed it in the Ig superfamily with three extracellular Ig-like domains [#2]. Ligand specificity is governed by the Bw4 epitope at HLA-B residues 77\\u201383, together with sequences outside Bw4 that distinguish HLA-B from HLA-A, so that only select Bw4-bearing HLA-A allotypes (A23, A24, A32, but not A25) also serve as ligands [#1, #5, #12]; HLA-G is an additional recognized ligand [#6]. Recognition is intrinsically peptide-sensitive: the identity of the HLA-presented peptide, particularly its solvent-exposed C-terminal positions, determines whether KIR3DL1 engages the peptide-HLA complex [#11, #15], and peptide trimming by ERAP1 tunes this engagement [#21, #22]. Upon ligand binding, both tyrosines of the cytoplasmic ITIM are phosphorylated and recruit the tyrosine phosphatase SHP-1/PTP1C, which is required for inhibitory signaling [#3]; the cytoplasmic region is intrinsically disordered and undergoes conformational change when its bis-phosphorylated ITIMs engage the tandem SH2 domains of SHP-2 [#20]. CD8\\u03b1\\u03b1 homodimers act as a coreceptor that enhances pMHC-I binding, promotes KIR3DL1 clustering at the immunological synapse, and augments inhibition and NK education [#19]. Extensive allotypic polymorphism modulates receptor surface density and folding\\u2014position 86 in D0 controlling ER retention via the WSXPS folding motif [#8], positions 58/92 in D0 impairing expression and HLA binding [#16]\\u2014as well as inhibitory strength and Bw4 binding affinity through D2 residues 238, 282, and 283 [#10, #15], with receptor and ligand density jointly calibrating NK education and reactivity [#18].\",\n  \"teleology\": [\n    {\n      \"year\": 1994,\n      \"claim\": \"Established that a defined NK surface glycoprotein, NKB1, is the receptor responsible for HLA-B-mediated inhibition, converting a phenomenological observation into a molecular receptor.\",\n      \"evidence\": \"DX9 mAb blocking of NK inhibition by HLA-B transfectants plus biochemical characterization\",\n      \"pmids\": [\"8046332\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Receptor gene not yet cloned\", \"HLA epitope recognized not yet mapped\"]\n    },\n    {\n      \"year\": 1995,\n      \"claim\": \"Cloned the receptor and mapped its HLA recognition to the Bw4 epitope, defining both the molecular identity and the ligand determinant.\",\n      \"evidence\": \"Expression cloning with DX9 mAb; cytotoxicity assays with Bw4/Bw6-differing HLA-B transfectants and glycosylation-site mutagenesis\",\n      \"pmids\": [\"7650366\", \"7532677\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Contribution of non-Bw4 HLA sequences unresolved\", \"Signaling mechanism unknown\"]\n    },\n    {\n      \"year\": 1995,\n      \"claim\": \"Showed that KIR3DL1 and the HLA-C receptor act as independent inhibitory receptors co-expressible on one NK clone, establishing combinatorial HLA surveillance.\",\n      \"evidence\": \"Dual antibody blocking and cytotoxicity assays on single NK clones with distinct HLA transfectants\",\n      \"pmids\": [\"7897214\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Does not address signaling crosstalk between receptors\"]\n    },\n    {\n      \"year\": 1996,\n      \"claim\": \"Defined the inhibitory signaling mechanism by showing both ITIM tyrosines must be phosphorylated to recruit the phosphatase PTP1C/SHP-1.\",\n      \"evidence\": \"Tyrosine-to-phenylalanine ITIM mutagenesis, co-IP with PTP1C, functional assays in Jurkat\",\n      \"pmids\": [\"8691146\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of phosphatase engagement not resolved\", \"Role of SHP-2 not addressed\"]\n    },\n    {\n      \"year\": 1997,\n      \"claim\": \"Refined ligand specificity, showing Bw4 residues contribute but additional HLA-B-specific sequences are required, and identified HLA-G as a ligand.\",\n      \"evidence\": \"HLA-B point mutagenesis (Leu82/Arg83), HLA-A vs HLA-B comparison, and anti-NKAT3 blocking with HLA-G transfectants\",\n      \"pmids\": [\"9164941\", \"9053439\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Structural mode of HLA-A versus HLA-B discrimination unknown\", \"HLA-G interaction shown in single study\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Established the molecular basis of allotype-specific surface expression, linking D0 residue 86 to folding and ER retention and identifying distinct promoter regulation.\",\n      \"evidence\": \"Reciprocal point mutagenesis with surface/intracellular flow cytometry; reporter assays and DNase I footprinting of the promoter\",\n      \"pmids\": [\"14662867\", \"12794136\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Folding chaperone partners not yet identified\", \"Determinants of variegated expression incompletely mapped\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Showed that allotypic residues outside the HLA contact surface (238, 320) tune inhibitory strength, separating binding affinity from signaling potency.\",\n      \"evidence\": \"Retroviral transduction of allotypes, reciprocal mutagenesis, cytotoxicity assays\",\n      \"pmids\": [\"16210627\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Mechanism by which non-contact residues alter inhibition unknown\"]\n    },\n    {\n      \"year\": 2005,\n      \"claim\": \"Demonstrated that KIR3DL1 recognition is sensitive to the specific peptide presented by HLA, with peptide P8 implicated as a key determinant.\",\n      \"evidence\": \"X-ray crystallography of HLA-B*2705-peptide complexes with KIR3DL1 tetramer binding and peptide mutagenesis\",\n      \"pmids\": [\"15657948\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No co-crystal of KIR3DL1 with pHLA\", \"Generalizability across HLA allotypes untested here\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Extended the functional ligand repertoire to specific Bw4+ HLA-A allotypes and pinpointed residue 90 as discriminating a non-ligand.\",\n      \"evidence\": \"Cytotoxicity assays with HLA-A transfectants and NK education comparisons\",\n      \"pmids\": [\"18502829\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of residue 90 effect not resolved\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Clarified the fate of poorly expressed allotypes, showing 3DL1*004 is largely ER-retained on calreticulin yet a folded fraction is functional.\",\n      \"evidence\": \"Membrane traffic analysis, calreticulin co-IP, functional NK inhibition assays\",\n      \"pmids\": [\"21115737\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Quantitative folding efficiency across allotypes not defined\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Linked epigenetic silencing of KIR3DL1 to a disease state, showing promoter hypermethylation drives loss of expression in NK-cell lymphoproliferative disease.\",\n      \"evidence\": \"RT-PCR, promoter methylation analysis, and flow cytometry in patients versus controls\",\n      \"pmids\": [\"20410181\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Causal versus correlative role of methylation not established\", \"Single-cohort observation\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Mapped D2 residues 282 and 283 as determinants of peptide selectivity, explaining how the receptor reads HLA-bound peptide without directly contacting it.\",\n      \"evidence\": \"Mutagenesis at positions 282/283 and NK functional assays with peptide-variant HLA\",\n      \"pmids\": [\"24563253\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural mechanism of indirect peptide sensing unresolved\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Showed KIR3DS1-derived D0 polymorphisms (58, 92) impair both expression and HLA binding, distinguishing the inhibitory and activating receptor lineages functionally.\",\n      \"evidence\": \"Mutagenesis, recombinant HLA binding assays, primary NK phenotyping, functional inhibition\",\n      \"pmids\": [\"26109640\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Ligand of activating KIR3DS1 not defined here\"]\n    },\n    {\n      \"year\": 2015,\n      \"claim\": \"Identified ERAP1-dependent peptide trimming as an upstream modulator of KIR3DL1 engagement and showed viral-peptide-loaded HLA can directly bind the receptor.\",\n      \"evidence\": \"ERAP1-variant APC co-cultures with affinity and cytokine assays; tetramer/transfectant assays with dengue NS1 peptide-HLA-B57\",\n      \"pmids\": [\"26321090\", \"26439909\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Direct structural impact of trimmed peptides not resolved\", \"Single-lab functional data\"]\n    },\n    {\n      \"year\": 2016,\n      \"claim\": \"Established that receptor and ligand surface density jointly calibrate NK education and reactive potential, integrating allotype effects into a quantitative framework.\",\n      \"evidence\": \"Primary NK functional assays across KIR3DL1/HLA-B subtype combinations with density measurements\",\n      \"pmids\": [\"26962229\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Molecular basis of density-dependent education unknown\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Defined CD8\\u03b1\\u03b1 as a coreceptor that enhances pMHC-I binding, synaptic clustering, and inhibition, and showed it regulates NK education.\",\n      \"evidence\": \"Recombinant binding assays, live-cell synapse imaging, NK activation assays with CD8\\u03b1\\u03b1 manipulation\",\n      \"pmids\": [\"31420518\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of the CD8\\u03b1\\u03b1-KIR3DL1-pMHC ternary arrangement undefined\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Provided a structural view of the cytoplasmic ITIM region, showing it is intrinsically disordered and reorganizes upon tandem SHP-2 SH2 engagement of bis-phosphorylated ITIMs.\",\n      \"evidence\": \"NMR spectroscopy of the cytoplasmic region with individual and tandem SHP-2 SH2 binding studies\",\n      \"pmids\": [\"30773397\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Full-length signaling complex not structurally resolved\", \"Functional consequence of membrane-binding segments untested\"]\n    },\n    {\n      \"year\": 2021,\n      \"claim\": \"Demonstrated therapeutic relevance by showing ERAP1 inhibition disrupts HLA-B*51:01/KIR3DL1 engagement and unleashes KIR3DL1+ NK cytotoxicity.\",\n      \"evidence\": \"ERAP1 knockdown and pharmacological inhibition with KIR3DL1+ NK degranulation/cytotoxicity assays\",\n      \"pmids\": [\"34917091\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"In vivo efficacy not established\", \"Breadth across HLA allotypes not defined\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How peptide-driven, ERAP1-shaped HLA conformers and the CD8\\u03b1\\u03b1 coreceptor are structurally integrated at the synapse to set the threshold for SHP-mediated inhibition remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"No ternary structure of KIR3DL1-pHLA-CD8\\u03b1\\u03b1\", \"Quantitative link between binding affinity, density, and signal output incomplete\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0001618\", \"supporting_discovery_ids\": [0, 1, 5, 6, 11, 12]},\n      {\"term_id\": \"GO:0060089\", \"supporting_discovery_ids\": [0, 3]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [3, 19]},\n      {\"term_id\": \"GO:0005198\", \"supporting_discovery_ids\": [2]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [0, 2, 7, 19]},\n      {\"term_id\": \"GO:0005783\", \"supporting_discovery_ids\": [8, 13]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [0, 3, 18]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [3, 20]}\n    ],\n    \"complexes\": [],\n    \"partners\": [\"HLA-B\", \"HLA-A\", \"HLA-G\", \"SHP-1\", \"SHP-2\", \"CD8A\", \"calreticulin\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":7,"faith_total":7,"faith_pct":100.0}}