{"gene":"NECTIN2","run_date":"2026-06-10T05:19:52","timeline":{"discoveries":[{"year":2003,"finding":"Nectin-2 (CD112) was identified as a direct cell-surface ligand for the activating NK receptor DNAM-1 (CD226). Protein purification, tryptic digestion, mass spectrometry, soluble Fc-fusion binding assays, and cell transfection cytotoxicity experiments demonstrated that Nectin-2-Fc binds DNAM-1-expressing COS-7 cells, and Nectin-2 transfectants are killed in a DNAM-1-dependent manner.","method":"Protein purification + mass spectrometry, soluble Fc-fusion binding assay, NK cytotoxicity assay with mAb blocking, cell transfection","journal":"The Journal of experimental medicine","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — multiple orthogonal methods (biochemical purification, mass spec, Fc-fusion binding, functional cytotoxicity) independently replicated across subsequent studies","pmids":["12913096"],"is_preprint":false},{"year":2004,"finding":"DNAM-1 (CD226) functionally interacts with Nectin-2 (CD112/PRR-2): ectopic expression of CD112 on BW5147 T cells increased susceptibility to NK/T-cell cytotoxicity in a CD226-dependent manner. Homophilic cell-surface CD112 interactions adversely affect CD226 binding to CD112, and CD226 ligation cooperates with LFA-1 to trigger cytotoxicity and cytokine secretion.","method":"Cell transfection, NK/T-cell cytotoxicity assay, soluble receptor binding affinity measurement, mAb blocking","journal":"International immunology","confidence":"High","confidence_rationale":"Tier 2 / Strong — functional cytotoxicity, receptor binding affinity, mAb blocking with consistent results across studies","pmids":["15039383"],"is_preprint":false},{"year":1998,"finding":"Nectin-2 (HveB/PVRL2) functions as a herpesvirus entry mediator: it confers susceptibility to entry of HSV-1 mutant strains, HSV-2, and pseudorabies virus (but not wild-type HSV-1 or bovine herpesvirus type 1) in otherwise resistant CHO cells. Anti-HveB antibodies blocked infection.","method":"cDNA expression library screen, CHO cell transfection viral entry assay, antibody blocking","journal":"Virology","confidence":"High","confidence_rationale":"Tier 2 / Strong — functional entry assay in resistant cells, antibody blocking, replicated by multiple follow-up studies","pmids":["9657005"],"is_preprint":false},{"year":2009,"finding":"TIGIT, expressed on all human NK cells, directly binds Nectin-2 (PVRL2) but not PVRL3, and inhibits NK cytotoxicity through its ITIM domain. TIGIT counter-inhibits NK-mediated killing of tumor cells and provides an 'alternative self' inhibitory mechanism independent of MHC class I.","method":"Flow cytometry, binding assays, NK cytotoxicity assay, ITIM functional analysis","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Strong — binding specificity, ITIM functional characterization, cytotoxicity assays; widely replicated","pmids":["19815499"],"is_preprint":false},{"year":2000,"finding":"Nectin-2 knockout in mice causes male-specific sterility with morphologically aberrant spermatozoa exhibiting defects in nuclear and cytoskeletal morphology and mitochondrial localization. Nectin-2 is expressed in testes only during late spermatogenesis, indicating a role in cytoskeletal reorganization during spermiogenesis.","method":"Gene knockout (nectin-2−/− mice), electron microscopy, immunohistochemistry, Western blot","journal":"Molecular and cellular biology","confidence":"High","confidence_rationale":"Tier 2 / Strong — clean knockout with defined morphological phenotype, expression analysis","pmids":["10733589"],"is_preprint":false},{"year":2003,"finding":"Loss of nectin-2 at Sertoli-spermatid junctions causes male infertility due to severe spermatozoan head and midpiece malformations, reduced migration to oviducts, impaired zona pellucida binding, and failure of sperm-oocyte fusion. Ectoplasmic specializations fail to form in the absence of nectin-2, evidenced by absence of the actin-bundling protein espin at Sertoli-spermatid junctions. Nectin-2 (from Sertoli cells) and nectin-3 (from spermatids) form a heterotypic adhesion complex at these junctions.","method":"Knockout mouse (nectin-2LacZ/LacZ), scanning electron microscopy, in vitro binding assays, LacZ knockin expression analysis, espin immunolocalization","journal":"Biology of reproduction","confidence":"High","confidence_rationale":"Tier 2 / Strong — knockout phenotype with multiple orthogonal functional and structural readouts","pmids":["12801998"],"is_preprint":false},{"year":2000,"finding":"Nectin-2alpha mediates cell-to-cell spread of HSV-1 mutant virus (carrying L25P substitution in gD) but not wild-type HSV-1, consistent with its role as an entry receptor for mutant but not wild-type virus. Nectin-1 is the principal mediator of wild-type virus spread in human cell lines; cell-to-cell spread requires the receptor to be expressed on both donor and recipient cells.","method":"Virus spread assay in J cells expressing defined receptors, mAb blocking, plaque assay","journal":"Journal of virology","confidence":"High","confidence_rationale":"Tier 2 / Moderate — functional spread assay with receptor-negative controls and antibody blocking, two orthogonal readouts","pmids":["10729168"],"is_preprint":false},{"year":2000,"finding":"Both nectin-2alpha and nectin-2delta splice isoforms serve as low-efficiency entry receptors for HSV-1 mutants (L25P substitution in gD) and HSV-2. The V domain at the N-terminus contains the major gD-binding region. In vitro soluble nectin-2 bound gD from HSV-1(U21) mutant weakly; wild-type HSV-1 gD binding to soluble nectin-2 was undetectable.","method":"Viral entry assay in transfected cells, in vitro gD-binding assay","journal":"Journal of virology","confidence":"High","confidence_rationale":"Tier 1–2 / Moderate — in vitro binding assay plus functional entry assay, domain mapping","pmids":["10627537"],"is_preprint":false},{"year":2001,"finding":"Two small regions in the V (variable-like Ig) domain of nectin-2 corresponding to amino acids 75–81 and 89 are critical for HSV entry activity. Replacement of amino acid 89 (M89F) in human nectin-2 eliminated HSV entry activity. This region is homologous to the HIV-binding region of CD4 and the poliovirus-binding region of CD155.","method":"Chimeric receptor construction, CHO cell transfection, viral entry assay, site-directed mutagenesis","journal":"Journal of virology","confidence":"High","confidence_rationale":"Tier 1 / Moderate — mutagenesis with functional entry assay, structure-informed","pmids":["11602758"],"is_preprint":false},{"year":2003,"finding":"Deletions in the N-terminus of HSV-1 or HSV-2 gD that overlap HVEM contact regions severely reduce functional interactions with nectin-2 and HVEM but not with nectin-1. Specific amino acid substitutions (L25P, Q27P, Q27R) in HSV-1 gD enhance cell fusion with cells expressing nectin-2 but are without effect on the high fusion level already seen with wild-type HSV-2 gD. The N-terminus of gD is necessary for functional interactions with nectin-2 but not nectin-1.","method":"Cell fusion assay, soluble gD:Fc binding assay, site-directed mutagenesis","journal":"Journal of virology","confidence":"High","confidence_rationale":"Tier 1 / Strong — multiple mutagenesis variants, two complementary assays (binding and fusion), replicated across serotypes","pmids":["12915538"],"is_preprint":false},{"year":2012,"finding":"Crystal structure of the nectin-2 V-set Ig domain (nectin-2v) at 1.85 Å resolution reveals a perpendicular homodimer arrangement. Mutational disruption of the homodimeric interface abolishes homodimer formation and simultaneously abolishes DNAM-1 binding (confirmed by tetramer staining and surface plasmon resonance), indicating that DNAM-1 binding requires homodimerization or engagement of the homodimeric interface of nectin-2.","method":"X-ray crystallography (1.85 Å), site-directed mutagenesis, SPR, cell staining with tetramers","journal":"Journal of immunology","confidence":"High","confidence_rationale":"Tier 1 / Strong — crystal structure plus mutagenesis plus SPR; multiple orthogonal methods in one study","pmids":["22547693"],"is_preprint":false},{"year":2012,"finding":"Crystal structure of nectin-2 homodimer at 1.3 Å resolution. Structural and mutagenesis studies reveal that charged residues at the dimer interface are major determinants of binding affinities for homophilic and heterophilic nectin interactions, explaining stronger heterophilic versus weaker homophilic interactions among nectin family members.","method":"X-ray crystallography (1.3 Å), complementary mutagenesis, biochemical binding assays","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 1 / Strong — high-resolution crystal structure combined with mutagenesis and biochemical validation","pmids":["22927415"],"is_preprint":false},{"year":2017,"finding":"TIGIT binds to the membrane-distal Ig domain of nectin-2 with an affinity of ~6 μM. Crystal structure of TIGIT bound to nectin-2 Ig domain shows a conserved 'lock-and-key' binding mode where an 'aromatic key' on nectin-2 is critical for TIGIT binding. TIGIT binding disrupts pre-assembled nectin-2 oligomers (receptor-ligand and ligand-ligand associations are mutually exclusive). The C-C' loop of nectin-2 dictates the TIGIT binding hierarchy. Mutagenesis established the energetic basis of the interaction.","method":"X-ray crystallography, SPR binding affinity measurement, mutagenesis, biochemical oligomer disruption assay","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — crystal structure, mutagenesis, and SPR in one rigorous study","pmids":["28515320"],"is_preprint":false},{"year":2016,"finding":"Crystal structure of the human TIGIT ectodomain reveals a classic two-layer β-sandwich IgSF topology. TIGIT is monomeric in solution but forms a canonical Ig-like dimer at high concentrations. Biochemical studies mapped the nectin-2 binding interface on TIGIT, providing structural and biochemical determinants for the TIGIT:nectin-2 interaction.","method":"X-ray crystallography, biophysical studies (SEC, AUC), biochemical mutagenesis mapping","journal":"Molecular immunology","confidence":"High","confidence_rationale":"Tier 1 / Moderate — crystal structure with complementary biophysical validation in one study","pmids":["27978489"],"is_preprint":false},{"year":2010,"finding":"Nectin-2 interacts physically with N-cadherin through their extracellular domains (not intracellular domains), and they cooperatively enhance apical constriction and F-actin accumulation at the apical cell surface during Xenopus neural tube morphogenesis. Nectin-2 knockdown impairs neural fold formation; overexpression in non-neural ectoderm induces ectopic apical constrictions. Accumulation of N-cadherin at the apical surface requires nectin-2, but nectin-2 localization is N-cadherin-independent.","method":"Morpholino knockdown, overexpression, co-immunoprecipitation, domain-deletion constructs, F-actin imaging in Xenopus embryos","journal":"Development (Cambridge, England)","confidence":"High","confidence_rationale":"Tier 2 / Moderate — reciprocal co-IP, loss- and gain-of-function with defined cellular phenotype, domain dissection in one study","pmids":["20332149"],"is_preprint":false},{"year":2010,"finding":"Human cytomegalovirus (HCMV) UL141 alone is sufficient to retain CD155 in the endoplasmic reticulum but requires assistance from additional HCMV-encoded functions to suppress CD112 (nectin-2) surface expression. HCMV targets CD112 for proteasome-mediated degradation by 48 h post-infection. Deletion of UL141 from the HCMV genome restores surface expression of both CD112 and CD155.","method":"HCMV infection, UL141-deletion mutant virus, proteasome inhibitor assays, flow cytometry","journal":"The Journal of general virology","confidence":"High","confidence_rationale":"Tier 2 / Moderate — viral deletion mutant, proteasome inhibitor rescue, two orthogonal mechanistic readouts","pmids":["20410314"],"is_preprint":false},{"year":2014,"finding":"Alphaherpesvirus gD glycoprotein (from PRV and HSV-2) causes degradation and downregulation of CD112 (nectin-2) during infection or transfection. This reduces DNAM-1 binding to infected/transfected cell surfaces, suppresses NK cell degranulation, and reduces NK cell-mediated lysis. This represents an NK immune evasion strategy by alphaherpesviruses.","method":"Virus infection, gD transfection, flow cytometry, NK cell degranulation assay, cytotoxicity assay, DNAM-1 binding assay","journal":"Proceedings of the National Academy of Sciences of the United States of America","confidence":"High","confidence_rationale":"Tier 2 / Moderate — infection and transfection model, multiple functional readouts, mechanistic link established","pmids":["25352670"],"is_preprint":false},{"year":2019,"finding":"PVRIG (CD112R) binds PVRL2 (nectin-2/CD112) and inhibits CD8+ T-cell cytokine production and cytotoxic activity. The inhibitory effect of PVRL2 on T cells is mediated by PVRIG and not TIGIT, establishing the PVRIG-PVRL2 pathway as a nonredundant signaling node from TIGIT-PVR. Combination PVRIG + TIGIT or PVRIG + PD-1 blockade further increases T-cell activation.","method":"Blocking antibody assays, T-cell cytokine production and cytotoxicity assays, tumor-infiltrating lymphocyte functional assays","journal":"Cancer immunology research","confidence":"High","confidence_rationale":"Tier 2 / Moderate — functional T-cell assays with specific blockade establishing pathway non-redundancy, multiple readouts","pmids":["30659054"],"is_preprint":false},{"year":2019,"finding":"Ubiquitination of Nectin2 promotes its degradation and is responsible for intracellular protein retention; inhibition of the ubiquitin-proteasome pathway results in increased Nectin2 surface expression and enhances tumor cell susceptibility to NK cell cytotoxicity.","method":"Ubiquitination assay, proteasome inhibitor treatment, flow cytometry, NK cytotoxicity assay","journal":"European journal of immunology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — biochemical pathway (ubiquitination + proteasome inhibitor), NK cytotoxicity readout; single lab","pmids":["30888046"],"is_preprint":false},{"year":2009,"finding":"Nectin-2 is required for maintaining structure and function of the intercalated disc in the heart under pressure overload. Nectin-2-knockout mice subjected to aortic banding develop cardiac fibrosis, disrupted intercalated discs, disorganized myofibrils, and increased cardiomyocyte apoptosis. Mechanistically, nectin-2 deficiency results in reduced Akt phosphorylation and elevated c-Jun N-terminal kinase and p38 MAPK phosphorylation under pressure overload.","method":"Nectin-2 knockout mice, aortic banding model, histology, Western blot for kinase phosphorylation, apoptosis assay","journal":"Hypertension (Dallas, Tex. : 1979)","confidence":"High","confidence_rationale":"Tier 2 / Moderate — clean knockout, defined disease model, multiple molecular readouts for signaling mechanism","pmids":["19667252"],"is_preprint":false},{"year":2016,"finding":"Nectin-2δ splice variant is selectively expressed in astrocytes and localizes to perivascular endfoot processes facing the basement membrane of blood vessels (not detected in neurons). Genetic ablation of nectin-2 causes degeneration of astrocytic perivascular endfoot processes and neurons in the cerebral cortex.","method":"Immunofluorescence/confocal microscopy, nectin-2 knockout mice, fractionation/localization analysis","journal":"Brain research","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — localization by immunofluorescence with knockout phenotype; single lab","pmids":["27545667"],"is_preprint":false},{"year":2006,"finding":"Nectin-2 (CD112) on eosinophils acts as a ligand for DNAM-1 (CD226) on mast cells. CD226 engagement synergizes with FcεRI on mast cells to augment degranulation through a pathway involving Fyn, LAT, PLCγ2, and CD18. Blocking CD112 on eosinophils with neutralizing antibodies normalized IgE-dependent mast cell hyperactivity in co-culture.","method":"Co-culture, degranulation assay, blocking antibodies, signaling pathway inhibitors","journal":"The Journal of biological chemistry","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional co-culture with signaling pathway dissection; single lab, multiple readouts","pmids":["16831868"],"is_preprint":false},{"year":2013,"finding":"Nectin-3 (CD113) on T lymphocytes uses Nectin-2 (CD112) expressed on endothelial cells as its major counter-receptor for heterophilic trans-interaction. Soluble Nectin-3 binds Nectin-2 localized at endothelial junctions and at high endothelial venules; blocking either Nectin-3 on lymphocytes or Nectin-2 on ECs with mAbs inhibits lymphocyte transendothelial migration in vitro.","method":"Soluble protein binding assay, mAb blocking, transendothelial migration assay in vitro","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — binding and functional migration assay with antibody blocking; single lab","pmids":["24116228"],"is_preprint":false},{"year":2021,"finding":"In CD112-deficient mice, blood vessel coverage in the retina and spleen is significantly enhanced. In vitro CD112 blockade modulates endothelial cell migration and enhances endothelial tube formation. CD112 blockade reduces T cell transmigration across endothelial monolayers in vitro, and T cell homing to the spleen is reduced in CD112-deficient mice in vivo.","method":"CD112-knockout mice, retinal vascular analysis, in vitro tube formation and migration assays, in vivo T cell homing assay, antibody blockade","journal":"Cells","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — KO mice with vascular phenotype plus in vitro functional assays; single lab","pmids":["33467729"],"is_preprint":false},{"year":2014,"finding":"Cadmium (Cd) suppresses nectin-2 expression via two mechanisms: (1) transcriptional repression by inhibiting binding of positive regulators (CREB, c-Jun, Sp1) to the nectin-2 promoter (shown by EMSA and ChIP), and (2) post-translational degradation via clathrin-dependent endocytosis (shown by inhibitor and shRNA knockdown experiments).","method":"EMSA, ChIP assay, endocytosis inhibitor assay, clathrin shRNA knockdown, immunofluorescence, siRNA/overexpression","journal":"Biochimica et biophysica acta","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods (EMSA, ChIP, functional endocytosis assay), single lab","pmids":["25046863"],"is_preprint":false},{"year":2006,"finding":"Nectin-2 gene transcription in Sertoli/germ cells is driven by cooperative interactions among two Sp1 motifs and a CRE motif within the minimal promoter (−316 to −211). CREB and c-Jun (but not c-Fos) are the critical transcription factors; c-Jun (AP-1) and CREB interact at the CRE motif. ChIP confirmed in vivo binding of CREB, c-Jun, and Sp1 to the nectin-2 promoter, and cyclic expression of CREB coincides with adherens junction restructuring in staged tubules.","method":"Transient transfection reporter assay, mutagenesis of promoter motifs, EMSA, ChIP assay, overexpression","journal":"Journal of cellular physiology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — ChIP plus EMSA plus functional reporter assays with mutagenesis; single lab","pmids":["16250013"],"is_preprint":false},{"year":2018,"finding":"Nectin-2 extracellular domain directly interacts with N-cadherin extracellular domain with a KD of ~3.5 μM (measured by SPR). Molecular docking and mutagenesis studies defined the binding interface, showing that nectins can recruit cadherins to adherens junctions through an adaptor-independent, extracellular mechanism.","method":"Surface plasmon resonance, molecular docking, mutagenesis, structural analysis","journal":"Proteins","confidence":"Medium","confidence_rationale":"Tier 1–2 / Moderate — SPR binding measurement with mutagenesis; single lab, limited cellular validation","pmids":["30183103"],"is_preprint":false},{"year":2022,"finding":"Nectin-2 acts as an entry-mediating molecule for human herpesvirus 6B (HHV-6B): nectin-2 expression in CD134-negative parotid-derived cells enables HHV-6B infection; nectin-2 knockout reduces viral entry; and HHV-6B glycoprotein B (gB) directly interacts with the nectin-2 V-set domain.","method":"Cell transduction, nectin-2 knockout, viral infection assay, co-immunoprecipitation/binding assay of gB with nectin-2 domain","journal":"Viruses","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — knockout plus functional rescue plus direct binding assay; single lab","pmids":["35062364"],"is_preprint":false},{"year":2024,"finding":"Crystal structure of PVRIG in complex with Nectin-2 at 2.2 Å resolution reveals an antiparallel lock-and-key binding mode. A unique CC' loop in PVRIG contributes to high-affinity Nectin-2 binding. CD112R binding disrupts CD112 homodimerization. Charged residues in the F-strands explain PVRIG selectivity for Nectin-2 but not Necl-5 (CD155). Structure-guided directed evolution produced CD112R mutants (CD112RIVE) with greatly increased affinity that potently block CD112-CD112R interactions.","method":"X-ray crystallography (2.2 Å), site-directed mutagenesis, directed evolution, soluble trap blocking assay, CAR-T and TCE functional assays","journal":"Structure (London, England : 1993)","confidence":"High","confidence_rationale":"Tier 1 / Strong — crystal structure with mutagenesis, directed evolution, and multiple functional assays in one rigorous study","pmids":["40285356"],"is_preprint":false},{"year":2024,"finding":"Crystal structure of PVRIG (CD112R) in complex with Nectin-2 reveals the molecular basis of immune recognition and selectivity. A unique CC' loop in PVRIG complements the double-lock-and-key binding mode contributing to high affinity. The corresponding charged residues in F-strands explain PVRIG selectivity toward Nectin-2 but not Necl-5.","method":"X-ray crystallography, binding affinity measurements, comparative structural analysis","journal":"Structure (London, England : 1993)","confidence":"High","confidence_rationale":"Tier 1 / Strong — crystal structure of the complex with multiple structural comparisons; single rigorous study","pmids":["38626767"],"is_preprint":false},{"year":2024,"finding":"PVRL2 (Nectin-2) suppresses antitumor immunity through PVRIG-independent and TIGIT-independent pathways: deletion of PVRL2 in syngeneic tumor models dramatically reduces tumor growth dependent on CD8+ T and NK cells. Loss of PVRL2 suppressed tumor growth even in the absence of PVRIG, and PVRIG loss showed no additive effect in the absence of PVRL2. Combined PVRL2 deletion plus TIGIT blockade achieved near-complete tumor growth suppression.","method":"PVRL2 syngeneic knockout mouse models, immune cell depletion, TIGIT blockade combination experiments","journal":"Cancer immunology research","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple syngeneic KO models, immune depletion epistasis, combination blockade; multiple orthogonal approaches","pmids":["38588410"],"is_preprint":false},{"year":2023,"finding":"VSIG2, expressed on activated antigen-presenting cells, specifically binds to Nectin-2 and does not interact with PD-1 or CTLA-4. This VSIG2-Nectin-2 interaction strongly inhibits T cell activation and proliferation and regulates the STAT1/IRF1/GBP2 signaling pathway in T cells.","method":"Co-immunoprecipitation/binding assays, T cell activation assays, signaling pathway analysis, VSIG2-Ig protein and anti-VSIG2 antibody functional experiments","journal":"Journal of neuroinflammation","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — binding specificity established, functional T cell assays, signaling pathway; single lab","pmids":["41350674"],"is_preprint":false},{"year":2025,"finding":"ST6GalNAc-I sialyltransferase mediates sialylation of NECTIN2 in lung adenocarcinoma cells, contributing to T cell dysfunction. ST6GalNAc-I-deficient tumor cells cocultured with T cells showed increased susceptibility to T cell-mediated killing, and mice injected with St6galnac-I-knockdown syngeneic cells showed reduced Nectin2/TIGIT-associated immunosuppression.","method":"Proteomics, biochemical sialylation assay, coculture cytotoxicity, syngeneic mouse tumor model, siRNA knockdown","journal":"The Journal of clinical investigation","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — biochemical PTM identification, functional T cell and in vivo assays; single lab","pmids":["40371640"],"is_preprint":false},{"year":2024,"finding":"In colorectal cancer, cancer-associated fibroblasts expressing NECTIN2 inhibit effector T cells; blocking NECTIN2 receptor interaction (with cognate immune receptor) reversed T cell inhibition, demonstrating NECTIN2 as the key driver of T cell suppression by a novel TinCAF fibroblast cluster.","method":"scRNA-seq, spatial proteomics, co-culture of CAF and T cells, NECTIN2 blocking antibody, flow cytometry","journal":"Cancer letters","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — blocking antibody in co-culture with functional T cell readout; single lab","pmids":["38821255"],"is_preprint":false},{"year":2016,"finding":"Nectin-2 (CD112) knockdown in outgrowth endothelial cells (OECs) enhances tube formation, cell migration, and proliferation with p-ERK activation, and increases compensatory expression of Nectin-3 and Necl-4 (which promote VEGFR signaling). Blocking Nectin-2 with neutralizing mAb similarly increases trans-well migration and tube formation.","method":"siRNA knockdown, neutralizing mAb, tube formation assay, migration assay, Western blot for p-ERK, qPCR","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — KD and blocking antibody with functional phenotype and molecular readout; single lab","pmids":["27676263"],"is_preprint":false},{"year":2023,"finding":"Nectin2 knockdown in neuroblastoma cells reduces migration and induces apoptosis and cell cycle arrest. ANXA2 is downstream of Nectin2; its expression is reduced by Nectin2 knockdown, and ANXA2 overexpression rescues apoptosis and restores MMP2/MMP9 expression, placing Nectin2 upstream of ANXA2 in a pro-survival pathway.","method":"siRNA knockdown, RNA-seq, qRT-PCR, Western blot, rescue overexpression, apoptosis assay, migration assay","journal":"Acta biochimica et biophysica Sinica","confidence":"Medium","confidence_rationale":"Tier 2–3 / Moderate — KD with rescue overexpression, multiple molecular readouts; single lab","pmids":["36916296"],"is_preprint":false},{"year":2024,"finding":"Tumor-associated neutrophils (TANs) upregulate membranous Nectin2 expression on pancreatic ductal adenocarcinoma cells (via CCL5 secretion and endoplasmic reticulum stress), contributing to CD8+ T-cell exhaustion. Blocking Nectin2 improved CD8+ T-cell function and suppressed tumor progression in mouse models.","method":"Microarray, cytokine array, in vitro co-culture, in vivo orthotopic/subcutaneous mouse model, Nectin2 blockade, single-cell transcriptome analysis","journal":"Journal of experimental & clinical cancer research : CR","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — in vitro and in vivo functional assays with blockade; single lab","pmids":["39261943"],"is_preprint":false}],"current_model":"NECTIN2 (Nectin-2/CD112/PVRL2/HveB) is a cell-surface Ig-superfamily adhesion molecule that (i) forms homodimers via its V-set domain—a conformation required for binding to the activating NK/T-cell receptor DNAM-1 (CD226)—and also engages inhibitory immune receptors TIGIT and PVRIG through a conserved lock-and-key mechanism that disrupts nectin-2 oligomers; (ii) serves as a herpesvirus entry receptor through direct gD-binding via its N-terminal V domain; (iii) is essential at Sertoli-spermatid ectoplasmic specializations for cytoskeletal organization during spermiogenesis; (iv) cooperates with N-cadherin via extracellular domain interactions to drive apical F-actin accumulation; (v) is regulated post-translationally by ubiquitin-proteasome-mediated degradation and by viral gD-induced degradation or HCMV UL141-assisted proteasomal degradation, modulating NK-cell immune surveillance; and (vi) suppresses antitumor CD8+ T and NK cell responses through both PVRIG-dependent and PVRIG-independent pathways in the tumor microenvironment."},"narrative":{"mechanistic_narrative":"NECTIN2 (CD112/PVRL2/HveB) is a cell-surface immunoglobulin-superfamily adhesion molecule that operates at the interface of immune regulation, cell-cell adhesion, and viral entry [PMID:12913096, PMID:22547693]. Its membrane-distal V-set Ig domain forms a perpendicular homodimer, and disruption of this homodimeric interface abolishes binding to the activating NK/T-cell receptor DNAM-1 (CD226), establishing that productive DNAM-1 engagement requires the homodimeric conformation [PMID:22547693, PMID:22927415]. The same V domain is competitively engaged by the inhibitory receptors TIGIT and PVRIG (CD112R) through a conserved antiparallel lock-and-key mode in which receptor binding disrupts pre-assembled NECTIN2 oligomers, making activating and inhibitory engagement mutually exclusive [PMID:28515320, PMID:40285356]. Through these axes NECTIN2 suppresses antitumor CD8+ T-cell and NK-cell responses: PVRIG–PVRL2 forms a nonredundant inhibitory node distinct from TIGIT–PVR [PMID:30659054], and PVRL2 deletion in syngeneic tumors restrains growth in a CD8+ T- and NK-dependent manner even through PVRIG-independent routes, with combined TIGIT blockade approaching complete suppression [PMID:38588410]. NECTIN2 also serves as a herpesvirus entry receptor, conferring susceptibility to HSV mutant strains, HSV-2, and pseudorabies virus via direct gD binding to its N-terminal V domain [PMID:9657005, PMID:10627537, PMID:11602758]. In adhesion contexts it engages N-cadherin through an extracellular, adaptor-independent interaction to drive apical F-actin accumulation [PMID:20332149, PMID:30183103], and it is essential at Sertoli–spermatid ectoplasmic specializations where it forms a heterotypic complex with nectin-3 to organize the cytoskeleton during spermiogenesis [PMID:10733589, PMID:12801998]. Surface levels are controlled post-translationally by ubiquitin-proteasome-mediated degradation, exploited by HCMV UL141 and alphaherpesvirus gD as NK immune-evasion strategies [PMID:20410314, PMID:25352670, PMID:30888046].","teleology":[{"year":1998,"claim":"Established NECTIN2 as a herpesvirus entry mediator, the first defined molecular function for the protein, explaining how certain HSV strains enter otherwise resistant cells.","evidence":"cDNA expression library screen and viral entry assay in CHO cells with antibody blocking","pmids":["9657005"],"confidence":"High","gaps":["Did not map the gD-binding region on NECTIN2","Did not explain selectivity for mutant over wild-type HSV-1"]},{"year":2000,"claim":"Defined the V domain as the gD-binding region and showed NECTIN2 supports cell-to-cell spread of mutant but not wild-type HSV-1, refining the receptor's entry specificity.","evidence":"Viral entry and spread assays in defined-receptor cells plus in vitro soluble gD binding","pmids":["10729168","10627537"],"confidence":"High","gaps":["Weak/undetectable wild-type gD binding left affinity determinants unresolved","Residue-level interface not yet defined"]},{"year":2000,"claim":"Knockout established a physiological role in spermiogenesis, showing NECTIN2 is required for normal sperm morphology and cytoskeletal organization.","evidence":"nectin-2 knockout mice with electron microscopy and expression analysis","pmids":["10733589"],"confidence":"High","gaps":["Molecular adhesion partner at the junction not identified","Downstream cytoskeletal effectors unknown"]},{"year":2001,"claim":"Pinpointed critical V-domain residues (aa 75-81 and M89) for HSV entry, linking the entry interface to analogous receptor-binding regions of CD4 and CD155.","evidence":"Chimeric receptors and site-directed mutagenesis with viral entry assay","pmids":["11602758"],"confidence":"High","gaps":["No co-structure of NECTIN2 with gD","Conformational basis of selectivity not resolved"]},{"year":2003,"claim":"Identified NECTIN2 as a direct ligand for the activating NK receptor DNAM-1, defining its first immune effector function.","evidence":"Protein purification, mass spectrometry, Fc-fusion binding and NK cytotoxicity assays","pmids":["12913096"],"confidence":"High","gaps":["Structural basis of DNAM-1 binding not defined","Relationship between homophilic adhesion and receptor engagement unclear"]},{"year":2003,"claim":"Showed NECTIN2/nectin-3 form a heterotypic Sertoli-spermatid adhesion complex required for ectoplasmic specialization assembly, mechanistically linking the knockout phenotype to junction formation.","evidence":"LacZ knockin knockout mice with espin immunolocalization and binding assays","pmids":["12801998"],"confidence":"High","gaps":["Intracellular signaling driving actin bundling not defined"]},{"year":2009,"claim":"Established TIGIT as a direct inhibitory receptor for NECTIN2 acting via its ITIM, providing an MHC-independent 'alternative self' brake on NK cytotoxicity.","evidence":"Binding assays, ITIM functional analysis and NK cytotoxicity assays","pmids":["19815499"],"confidence":"High","gaps":["Structural interface not yet defined","Competition with DNAM-1 not yet demonstrated"]},{"year":2009,"claim":"Revealed a cardiac role: NECTIN2 maintains intercalated disc integrity under pressure overload via Akt/JNK/p38 signaling, extending function beyond immunity and reproduction.","evidence":"Knockout mice with aortic banding, histology and phospho-kinase Western blots","pmids":["19667252"],"confidence":"High","gaps":["Direct adhesion partner at the intercalated disc not identified","Mechanism linking adhesion to kinase signaling unresolved"]},{"year":2010,"claim":"Demonstrated an extracellular NECTIN2-N-cadherin interaction driving apical constriction and F-actin accumulation, defining a cooperative adhesion mechanism in morphogenesis.","evidence":"Morpholino knockdown, overexpression, co-IP and domain dissection in Xenopus","pmids":["20332149"],"confidence":"High","gaps":["Affinity and interface not quantified in this study","Link to actin machinery not molecularly defined"]},{"year":2010,"claim":"Showed HCMV downregulates surface NECTIN2 via proteasomal degradation requiring UL141 plus additional viral functions, defining a viral immune-evasion mechanism distinct from CD155 retention.","evidence":"HCMV UL141-deletion mutant, proteasome inhibitor assays and flow cytometry","pmids":["20410314"],"confidence":"High","gaps":["Additional HCMV factors required for NECTIN2 suppression not identified","E3 ligase mediating degradation unknown"]},{"year":2012,"claim":"Crystal structures established the NECTIN2 V-domain homodimer and showed DNAM-1 binding requires the homodimeric interface, unifying adhesion conformation with receptor engagement.","evidence":"X-ray crystallography (1.85 and 1.3 A), mutagenesis, SPR and tetramer staining","pmids":["22547693","22927415"],"confidence":"High","gaps":["Did not address how inhibitory receptors compete with homodimer","Full-length ectodomain architecture not resolved"]},{"year":2014,"claim":"Showed alphaherpesvirus gD degrades NECTIN2 to reduce DNAM-1 binding and NK killing, mechanistically uniting the entry receptor and immune-evasion roles.","evidence":"Virus infection and gD transfection with NK degranulation and cytotoxicity assays","pmids":["25352670"],"confidence":"High","gaps":["Degradation route (proteasome vs lysosome) not fully defined","gD residues mediating degradation not mapped"]},{"year":2014,"claim":"Identified dual transcriptional and post-translational control of NECTIN2 by cadmium, implicating CREB/c-Jun/Sp1 promoter regulation and clathrin-dependent endocytosis.","evidence":"EMSA, ChIP, endocytosis inhibitor and clathrin shRNA assays","pmids":["25046863"],"confidence":"Medium","gaps":["Single-lab study","Physiological relevance beyond cadmium exposure unclear"]},{"year":2017,"claim":"Defined the TIGIT:NECTIN2 lock-and-key structure and showed TIGIT binding disrupts NECTIN2 oligomers, establishing mutual exclusivity of activating and inhibitory engagement.","evidence":"X-ray crystallography, SPR and biochemical oligomer-disruption assays","pmids":["28515320","27978489"],"confidence":"High","gaps":["In situ competition between DNAM-1 and TIGIT not directly visualized","Affinity (~6 uM) physiological tuning unresolved"]},{"year":2019,"claim":"Established PVRIG (CD112R) as a nonredundant inhibitory receptor for NECTIN2 on CD8+ T cells, distinct from the TIGIT axis and a candidate combination immunotherapy target.","evidence":"Blocking antibody T-cell cytokine/cytotoxicity and TIL functional assays","pmids":["30659054"],"confidence":"High","gaps":["Structural basis of PVRIG selectivity not yet defined","PVRIG-independent NECTIN2 effects not yet examined"]},{"year":2019,"claim":"Showed ubiquitin-proteasome degradation governs NECTIN2 surface levels and tumor cell susceptibility to NK killing, defining an endogenous post-translational control point.","evidence":"Ubiquitination assay, proteasome inhibitor treatment and NK cytotoxicity","pmids":["30888046"],"confidence":"Medium","gaps":["Responsible E3 ligase not identified","Single-lab study"]},{"year":2024,"claim":"Solved the PVRIG:NECTIN2 complex structure, explaining PVRIG selectivity and homodimer disruption, and enabling high-affinity blocking variants for therapy.","evidence":"X-ray crystallography (2.2 A), mutagenesis, directed evolution and CAR-T/TCE functional assays","pmids":["40285356","38626767"],"confidence":"High","gaps":["In vivo efficacy of engineered variants not established here","Full ectodomain context not resolved"]},{"year":2024,"claim":"Demonstrated PVRL2 suppresses antitumor immunity through PVRIG- and TIGIT-independent pathways, establishing it as an upstream node whose deletion combined with TIGIT blockade nearly abolishes tumor growth.","evidence":"Syngeneic PVRL2-knockout tumor models, immune-cell depletion epistasis and combination blockade","pmids":["38588410"],"confidence":"High","gaps":["Identity of the PVRIG/TIGIT-independent receptor unresolved","Mechanism of PVRIG-independent suppression undefined"]},{"year":2024,"claim":"Identified stromal sources of NECTIN2-mediated T-cell suppression in tumors, showing fibroblasts and tumor-associated neutrophil-induced NECTIN2 drive CD8+ T-cell dysfunction reversible by blockade.","evidence":"scRNA-seq, spatial proteomics, CAF/TAN-tumor-T cell co-culture and in vivo blockade","pmids":["38821255","39261943"],"confidence":"Medium","gaps":["Receptor mediating suppression in these contexts not always defined","Single-lab studies"]},{"year":null,"claim":"The identity of the receptor(s) and signaling mechanism underlying NECTIN2's PVRIG- and TIGIT-independent immunosuppression, and the E3 ligase(s) controlling its proteasomal turnover, remain unresolved.","evidence":"","pmids":[],"confidence":"High","gaps":["No defined receptor for the PVRIG/TIGIT-independent tumor pathway","Ubiquitin ligase regulating NECTIN2 surface levels unidentified","No unified structural model of full ectodomain in cis/trans"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0098631","term_label":"cell adhesion mediator activity","supporting_discovery_ids":[5,14,26]},{"term_id":"GO:0001618","term_label":"virus receptor activity","supporting_discovery_ids":[2,7,27]},{"term_id":"GO:0048018","term_label":"receptor ligand activity","supporting_discovery_ids":[0,3,12,17]},{"term_id":"GO:0098772","term_label":"molecular function regulator activity","supporting_discovery_ids":[17,30]}],"localization":[{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[0,2,5,14,15]}],"pathway":[{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[0,3,17,30]},{"term_id":"R-HSA-1500931","term_label":"Cell-Cell communication","supporting_discovery_ids":[5,14,26]},{"term_id":"R-HSA-1643685","term_label":"Disease","supporting_discovery_ids":[2,15,16,30]}],"complexes":["NECTIN2-nectin-3 Sertoli-spermatid adhesion complex"],"partners":["DNAM-1","TIGIT","PVRIG","N-CADHERIN","NECTIN-3","VSIG2"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"Q92692","full_name":"Nectin-2","aliases":["Herpes virus entry mediator B","Herpesvirus entry mediator B","HveB","Nectin cell adhesion molecule 2","Poliovirus receptor-related protein 2"],"length_aa":538,"mass_kda":57.7,"function":"Modulator of T-cell signaling. Can be either a costimulator of T-cell function, or a coinhibitor, depending on the receptor it binds to. Upon binding to CD226, stimulates T-cell proliferation and cytokine production, including that of IL2, IL5, IL10, IL13, and IFNG. Upon interaction with PVRIG, inhibits T-cell proliferation. These interactions are competitive (PubMed:26755705). Probable cell adhesion protein (PubMed:9657005) (Microbial infection) Acts as a receptor for herpes simplex virus 1 (HHV-1) mutant Rid1, herpes simplex virus 1 (HHV-2) and pseudorabies virus (PRV)","subcellular_location":"Cell membrane","url":"https://www.uniprot.org/uniprotkb/Q92692/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/NECTIN2","classification":"Not Classified","n_dependent_lines":2,"n_total_lines":1208,"dependency_fraction":0.0016556291390728477},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[{"gene":"CANX","stoichiometry":0.2}],"url":"https://opencell.sf.czbiohub.org/search/NECTIN2","total_profiled":1310},"omim":[{"mim_id":"621139","title":"COILED-COIL DOMAIN-CONTAINING PROTEIN 178; CCDC178","url":"https://www.omim.org/entry/621139"},{"mim_id":"600798","title":"NECTIN CELL ADHESION MOLECULE 2; NECTIN2","url":"https://www.omim.org/entry/600798"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Approved","locations":[{"location":"Vesicles","reliability":"Approved"},{"location":"Plasma membrane","reliability":"Additional"},{"location":"Mitotic spindle","reliability":"Additional"}],"tissue_specificity":"Low tissue specificity","tissue_distribution":"Detected in all","driving_tissues":[],"url":"https://www.proteinatlas.org/search/NECTIN2"},"hgnc":{"alias_symbol":["PVRR2","PRR2","CD112","Nectin-2"],"prev_symbol":["HVEB","PVRL2"]},"alphafold":{"accession":"Q92692","domains":[{"cath_id":"2.60.40.10","chopping":"36-160","consensus_level":"high","plddt":88.5214,"start":36,"end":160},{"cath_id":"2.60.40.10","chopping":"164-256","consensus_level":"high","plddt":96.2256,"start":164,"end":256},{"cath_id":"2.60.40.10","chopping":"261-345","consensus_level":"high","plddt":93.5552,"start":261,"end":345}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/Q92692","model_url":"https://alphafold.ebi.ac.uk/files/AF-Q92692-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-Q92692-F1-predicted_aligned_error_v6.png","plddt_mean":75.75},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=NECTIN2","jax_strain_url":"https://www.jax.org/strain/search?query=NECTIN2"},"sequence":{"accession":"Q92692","fasta_url":"https://rest.uniprot.org/uniprotkb/Q92692.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/Q92692/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/Q92692"}},"corpus_meta":[{"pmid":"19815499","id":"PMC_19815499","title":"The 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(CD112) was identified as a direct cell-surface ligand for the activating NK receptor DNAM-1 (CD226). Protein purification, tryptic digestion, mass spectrometry, soluble Fc-fusion binding assays, and cell transfection cytotoxicity experiments demonstrated that Nectin-2-Fc binds DNAM-1-expressing COS-7 cells, and Nectin-2 transfectants are killed in a DNAM-1-dependent manner.\",\n      \"method\": \"Protein purification + mass spectrometry, soluble Fc-fusion binding assay, NK cytotoxicity assay with mAb blocking, cell transfection\",\n      \"journal\": \"The Journal of experimental medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — multiple orthogonal methods (biochemical purification, mass spec, Fc-fusion binding, functional cytotoxicity) independently replicated across subsequent studies\",\n      \"pmids\": [\"12913096\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2004,\n      \"finding\": \"DNAM-1 (CD226) functionally interacts with Nectin-2 (CD112/PRR-2): ectopic expression of CD112 on BW5147 T cells increased susceptibility to NK/T-cell cytotoxicity in a CD226-dependent manner. Homophilic cell-surface CD112 interactions adversely affect CD226 binding to CD112, and CD226 ligation cooperates with LFA-1 to trigger cytotoxicity and cytokine secretion.\",\n      \"method\": \"Cell transfection, NK/T-cell cytotoxicity assay, soluble receptor binding affinity measurement, mAb blocking\",\n      \"journal\": \"International immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — functional cytotoxicity, receptor binding affinity, mAb blocking with consistent results across studies\",\n      \"pmids\": [\"15039383\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"Nectin-2 (HveB/PVRL2) functions as a herpesvirus entry mediator: it confers susceptibility to entry of HSV-1 mutant strains, HSV-2, and pseudorabies virus (but not wild-type HSV-1 or bovine herpesvirus type 1) in otherwise resistant CHO cells. Anti-HveB antibodies blocked infection.\",\n      \"method\": \"cDNA expression library screen, CHO cell transfection viral entry assay, antibody blocking\",\n      \"journal\": \"Virology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — functional entry assay in resistant cells, antibody blocking, replicated by multiple follow-up studies\",\n      \"pmids\": [\"9657005\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"TIGIT, expressed on all human NK cells, directly binds Nectin-2 (PVRL2) but not PVRL3, and inhibits NK cytotoxicity through its ITIM domain. TIGIT counter-inhibits NK-mediated killing of tumor cells and provides an 'alternative self' inhibitory mechanism independent of MHC class I.\",\n      \"method\": \"Flow cytometry, binding assays, NK cytotoxicity assay, ITIM functional analysis\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — binding specificity, ITIM functional characterization, cytotoxicity assays; widely replicated\",\n      \"pmids\": [\"19815499\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"Nectin-2 knockout in mice causes male-specific sterility with morphologically aberrant spermatozoa exhibiting defects in nuclear and cytoskeletal morphology and mitochondrial localization. Nectin-2 is expressed in testes only during late spermatogenesis, indicating a role in cytoskeletal reorganization during spermiogenesis.\",\n      \"method\": \"Gene knockout (nectin-2−/− mice), electron microscopy, immunohistochemistry, Western blot\",\n      \"journal\": \"Molecular and cellular biology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — clean knockout with defined morphological phenotype, expression analysis\",\n      \"pmids\": [\"10733589\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Loss of nectin-2 at Sertoli-spermatid junctions causes male infertility due to severe spermatozoan head and midpiece malformations, reduced migration to oviducts, impaired zona pellucida binding, and failure of sperm-oocyte fusion. Ectoplasmic specializations fail to form in the absence of nectin-2, evidenced by absence of the actin-bundling protein espin at Sertoli-spermatid junctions. Nectin-2 (from Sertoli cells) and nectin-3 (from spermatids) form a heterotypic adhesion complex at these junctions.\",\n      \"method\": \"Knockout mouse (nectin-2LacZ/LacZ), scanning electron microscopy, in vitro binding assays, LacZ knockin expression analysis, espin immunolocalization\",\n      \"journal\": \"Biology of reproduction\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — knockout phenotype with multiple orthogonal functional and structural readouts\",\n      \"pmids\": [\"12801998\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"Nectin-2alpha mediates cell-to-cell spread of HSV-1 mutant virus (carrying L25P substitution in gD) but not wild-type HSV-1, consistent with its role as an entry receptor for mutant but not wild-type virus. Nectin-1 is the principal mediator of wild-type virus spread in human cell lines; cell-to-cell spread requires the receptor to be expressed on both donor and recipient cells.\",\n      \"method\": \"Virus spread assay in J cells expressing defined receptors, mAb blocking, plaque assay\",\n      \"journal\": \"Journal of virology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional spread assay with receptor-negative controls and antibody blocking, two orthogonal readouts\",\n      \"pmids\": [\"10729168\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"Both nectin-2alpha and nectin-2delta splice isoforms serve as low-efficiency entry receptors for HSV-1 mutants (L25P substitution in gD) and HSV-2. The V domain at the N-terminus contains the major gD-binding region. In vitro soluble nectin-2 bound gD from HSV-1(U21) mutant weakly; wild-type HSV-1 gD binding to soluble nectin-2 was undetectable.\",\n      \"method\": \"Viral entry assay in transfected cells, in vitro gD-binding assay\",\n      \"journal\": \"Journal of virology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — in vitro binding assay plus functional entry assay, domain mapping\",\n      \"pmids\": [\"10627537\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2001,\n      \"finding\": \"Two small regions in the V (variable-like Ig) domain of nectin-2 corresponding to amino acids 75–81 and 89 are critical for HSV entry activity. Replacement of amino acid 89 (M89F) in human nectin-2 eliminated HSV entry activity. This region is homologous to the HIV-binding region of CD4 and the poliovirus-binding region of CD155.\",\n      \"method\": \"Chimeric receptor construction, CHO cell transfection, viral entry assay, site-directed mutagenesis\",\n      \"journal\": \"Journal of virology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — mutagenesis with functional entry assay, structure-informed\",\n      \"pmids\": [\"11602758\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2003,\n      \"finding\": \"Deletions in the N-terminus of HSV-1 or HSV-2 gD that overlap HVEM contact regions severely reduce functional interactions with nectin-2 and HVEM but not with nectin-1. Specific amino acid substitutions (L25P, Q27P, Q27R) in HSV-1 gD enhance cell fusion with cells expressing nectin-2 but are without effect on the high fusion level already seen with wild-type HSV-2 gD. The N-terminus of gD is necessary for functional interactions with nectin-2 but not nectin-1.\",\n      \"method\": \"Cell fusion assay, soluble gD:Fc binding assay, site-directed mutagenesis\",\n      \"journal\": \"Journal of virology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — multiple mutagenesis variants, two complementary assays (binding and fusion), replicated across serotypes\",\n      \"pmids\": [\"12915538\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Crystal structure of the nectin-2 V-set Ig domain (nectin-2v) at 1.85 Å resolution reveals a perpendicular homodimer arrangement. Mutational disruption of the homodimeric interface abolishes homodimer formation and simultaneously abolishes DNAM-1 binding (confirmed by tetramer staining and surface plasmon resonance), indicating that DNAM-1 binding requires homodimerization or engagement of the homodimeric interface of nectin-2.\",\n      \"method\": \"X-ray crystallography (1.85 Å), site-directed mutagenesis, SPR, cell staining with tetramers\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crystal structure plus mutagenesis plus SPR; multiple orthogonal methods in one study\",\n      \"pmids\": [\"22547693\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2012,\n      \"finding\": \"Crystal structure of nectin-2 homodimer at 1.3 Å resolution. Structural and mutagenesis studies reveal that charged residues at the dimer interface are major determinants of binding affinities for homophilic and heterophilic nectin interactions, explaining stronger heterophilic versus weaker homophilic interactions among nectin family members.\",\n      \"method\": \"X-ray crystallography (1.3 Å), complementary mutagenesis, biochemical binding assays\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — high-resolution crystal structure combined with mutagenesis and biochemical validation\",\n      \"pmids\": [\"22927415\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2017,\n      \"finding\": \"TIGIT binds to the membrane-distal Ig domain of nectin-2 with an affinity of ~6 μM. Crystal structure of TIGIT bound to nectin-2 Ig domain shows a conserved 'lock-and-key' binding mode where an 'aromatic key' on nectin-2 is critical for TIGIT binding. TIGIT binding disrupts pre-assembled nectin-2 oligomers (receptor-ligand and ligand-ligand associations are mutually exclusive). The C-C' loop of nectin-2 dictates the TIGIT binding hierarchy. Mutagenesis established the energetic basis of the interaction.\",\n      \"method\": \"X-ray crystallography, SPR binding affinity measurement, mutagenesis, biochemical oligomer disruption assay\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crystal structure, mutagenesis, and SPR in one rigorous study\",\n      \"pmids\": [\"28515320\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Crystal structure of the human TIGIT ectodomain reveals a classic two-layer β-sandwich IgSF topology. TIGIT is monomeric in solution but forms a canonical Ig-like dimer at high concentrations. Biochemical studies mapped the nectin-2 binding interface on TIGIT, providing structural and biochemical determinants for the TIGIT:nectin-2 interaction.\",\n      \"method\": \"X-ray crystallography, biophysical studies (SEC, AUC), biochemical mutagenesis mapping\",\n      \"journal\": \"Molecular immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Moderate — crystal structure with complementary biophysical validation in one study\",\n      \"pmids\": [\"27978489\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Nectin-2 interacts physically with N-cadherin through their extracellular domains (not intracellular domains), and they cooperatively enhance apical constriction and F-actin accumulation at the apical cell surface during Xenopus neural tube morphogenesis. Nectin-2 knockdown impairs neural fold formation; overexpression in non-neural ectoderm induces ectopic apical constrictions. Accumulation of N-cadherin at the apical surface requires nectin-2, but nectin-2 localization is N-cadherin-independent.\",\n      \"method\": \"Morpholino knockdown, overexpression, co-immunoprecipitation, domain-deletion constructs, F-actin imaging in Xenopus embryos\",\n      \"journal\": \"Development (Cambridge, England)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — reciprocal co-IP, loss- and gain-of-function with defined cellular phenotype, domain dissection in one study\",\n      \"pmids\": [\"20332149\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2010,\n      \"finding\": \"Human cytomegalovirus (HCMV) UL141 alone is sufficient to retain CD155 in the endoplasmic reticulum but requires assistance from additional HCMV-encoded functions to suppress CD112 (nectin-2) surface expression. HCMV targets CD112 for proteasome-mediated degradation by 48 h post-infection. Deletion of UL141 from the HCMV genome restores surface expression of both CD112 and CD155.\",\n      \"method\": \"HCMV infection, UL141-deletion mutant virus, proteasome inhibitor assays, flow cytometry\",\n      \"journal\": \"The Journal of general virology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — viral deletion mutant, proteasome inhibitor rescue, two orthogonal mechanistic readouts\",\n      \"pmids\": [\"20410314\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Alphaherpesvirus gD glycoprotein (from PRV and HSV-2) causes degradation and downregulation of CD112 (nectin-2) during infection or transfection. This reduces DNAM-1 binding to infected/transfected cell surfaces, suppresses NK cell degranulation, and reduces NK cell-mediated lysis. This represents an NK immune evasion strategy by alphaherpesviruses.\",\n      \"method\": \"Virus infection, gD transfection, flow cytometry, NK cell degranulation assay, cytotoxicity assay, DNAM-1 binding assay\",\n      \"journal\": \"Proceedings of the National Academy of Sciences of the United States of America\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — infection and transfection model, multiple functional readouts, mechanistic link established\",\n      \"pmids\": [\"25352670\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"PVRIG (CD112R) binds PVRL2 (nectin-2/CD112) and inhibits CD8+ T-cell cytokine production and cytotoxic activity. The inhibitory effect of PVRL2 on T cells is mediated by PVRIG and not TIGIT, establishing the PVRIG-PVRL2 pathway as a nonredundant signaling node from TIGIT-PVR. Combination PVRIG + TIGIT or PVRIG + PD-1 blockade further increases T-cell activation.\",\n      \"method\": \"Blocking antibody assays, T-cell cytokine production and cytotoxicity assays, tumor-infiltrating lymphocyte functional assays\",\n      \"journal\": \"Cancer immunology research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional T-cell assays with specific blockade establishing pathway non-redundancy, multiple readouts\",\n      \"pmids\": [\"30659054\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2019,\n      \"finding\": \"Ubiquitination of Nectin2 promotes its degradation and is responsible for intracellular protein retention; inhibition of the ubiquitin-proteasome pathway results in increased Nectin2 surface expression and enhances tumor cell susceptibility to NK cell cytotoxicity.\",\n      \"method\": \"Ubiquitination assay, proteasome inhibitor treatment, flow cytometry, NK cytotoxicity assay\",\n      \"journal\": \"European journal of immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — biochemical pathway (ubiquitination + proteasome inhibitor), NK cytotoxicity readout; single lab\",\n      \"pmids\": [\"30888046\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2009,\n      \"finding\": \"Nectin-2 is required for maintaining structure and function of the intercalated disc in the heart under pressure overload. Nectin-2-knockout mice subjected to aortic banding develop cardiac fibrosis, disrupted intercalated discs, disorganized myofibrils, and increased cardiomyocyte apoptosis. Mechanistically, nectin-2 deficiency results in reduced Akt phosphorylation and elevated c-Jun N-terminal kinase and p38 MAPK phosphorylation under pressure overload.\",\n      \"method\": \"Nectin-2 knockout mice, aortic banding model, histology, Western blot for kinase phosphorylation, apoptosis assay\",\n      \"journal\": \"Hypertension (Dallas, Tex. : 1979)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — clean knockout, defined disease model, multiple molecular readouts for signaling mechanism\",\n      \"pmids\": [\"19667252\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Nectin-2δ splice variant is selectively expressed in astrocytes and localizes to perivascular endfoot processes facing the basement membrane of blood vessels (not detected in neurons). Genetic ablation of nectin-2 causes degeneration of astrocytic perivascular endfoot processes and neurons in the cerebral cortex.\",\n      \"method\": \"Immunofluorescence/confocal microscopy, nectin-2 knockout mice, fractionation/localization analysis\",\n      \"journal\": \"Brain research\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — localization by immunofluorescence with knockout phenotype; single lab\",\n      \"pmids\": [\"27545667\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Nectin-2 (CD112) on eosinophils acts as a ligand for DNAM-1 (CD226) on mast cells. CD226 engagement synergizes with FcεRI on mast cells to augment degranulation through a pathway involving Fyn, LAT, PLCγ2, and CD18. Blocking CD112 on eosinophils with neutralizing antibodies normalized IgE-dependent mast cell hyperactivity in co-culture.\",\n      \"method\": \"Co-culture, degranulation assay, blocking antibodies, signaling pathway inhibitors\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional co-culture with signaling pathway dissection; single lab, multiple readouts\",\n      \"pmids\": [\"16831868\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"Nectin-3 (CD113) on T lymphocytes uses Nectin-2 (CD112) expressed on endothelial cells as its major counter-receptor for heterophilic trans-interaction. Soluble Nectin-3 binds Nectin-2 localized at endothelial junctions and at high endothelial venules; blocking either Nectin-3 on lymphocytes or Nectin-2 on ECs with mAbs inhibits lymphocyte transendothelial migration in vitro.\",\n      \"method\": \"Soluble protein binding assay, mAb blocking, transendothelial migration assay in vitro\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — binding and functional migration assay with antibody blocking; single lab\",\n      \"pmids\": [\"24116228\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2021,\n      \"finding\": \"In CD112-deficient mice, blood vessel coverage in the retina and spleen is significantly enhanced. In vitro CD112 blockade modulates endothelial cell migration and enhances endothelial tube formation. CD112 blockade reduces T cell transmigration across endothelial monolayers in vitro, and T cell homing to the spleen is reduced in CD112-deficient mice in vivo.\",\n      \"method\": \"CD112-knockout mice, retinal vascular analysis, in vitro tube formation and migration assays, in vivo T cell homing assay, antibody blockade\",\n      \"journal\": \"Cells\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — KO mice with vascular phenotype plus in vitro functional assays; single lab\",\n      \"pmids\": [\"33467729\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2014,\n      \"finding\": \"Cadmium (Cd) suppresses nectin-2 expression via two mechanisms: (1) transcriptional repression by inhibiting binding of positive regulators (CREB, c-Jun, Sp1) to the nectin-2 promoter (shown by EMSA and ChIP), and (2) post-translational degradation via clathrin-dependent endocytosis (shown by inhibitor and shRNA knockdown experiments).\",\n      \"method\": \"EMSA, ChIP assay, endocytosis inhibitor assay, clathrin shRNA knockdown, immunofluorescence, siRNA/overexpression\",\n      \"journal\": \"Biochimica et biophysica acta\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods (EMSA, ChIP, functional endocytosis assay), single lab\",\n      \"pmids\": [\"25046863\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2006,\n      \"finding\": \"Nectin-2 gene transcription in Sertoli/germ cells is driven by cooperative interactions among two Sp1 motifs and a CRE motif within the minimal promoter (−316 to −211). CREB and c-Jun (but not c-Fos) are the critical transcription factors; c-Jun (AP-1) and CREB interact at the CRE motif. ChIP confirmed in vivo binding of CREB, c-Jun, and Sp1 to the nectin-2 promoter, and cyclic expression of CREB coincides with adherens junction restructuring in staged tubules.\",\n      \"method\": \"Transient transfection reporter assay, mutagenesis of promoter motifs, EMSA, ChIP assay, overexpression\",\n      \"journal\": \"Journal of cellular physiology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — ChIP plus EMSA plus functional reporter assays with mutagenesis; single lab\",\n      \"pmids\": [\"16250013\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2018,\n      \"finding\": \"Nectin-2 extracellular domain directly interacts with N-cadherin extracellular domain with a KD of ~3.5 μM (measured by SPR). Molecular docking and mutagenesis studies defined the binding interface, showing that nectins can recruit cadherins to adherens junctions through an adaptor-independent, extracellular mechanism.\",\n      \"method\": \"Surface plasmon resonance, molecular docking, mutagenesis, structural analysis\",\n      \"journal\": \"Proteins\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 1–2 / Moderate — SPR binding measurement with mutagenesis; single lab, limited cellular validation\",\n      \"pmids\": [\"30183103\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2022,\n      \"finding\": \"Nectin-2 acts as an entry-mediating molecule for human herpesvirus 6B (HHV-6B): nectin-2 expression in CD134-negative parotid-derived cells enables HHV-6B infection; nectin-2 knockout reduces viral entry; and HHV-6B glycoprotein B (gB) directly interacts with the nectin-2 V-set domain.\",\n      \"method\": \"Cell transduction, nectin-2 knockout, viral infection assay, co-immunoprecipitation/binding assay of gB with nectin-2 domain\",\n      \"journal\": \"Viruses\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — knockout plus functional rescue plus direct binding assay; single lab\",\n      \"pmids\": [\"35062364\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Crystal structure of PVRIG in complex with Nectin-2 at 2.2 Å resolution reveals an antiparallel lock-and-key binding mode. A unique CC' loop in PVRIG contributes to high-affinity Nectin-2 binding. CD112R binding disrupts CD112 homodimerization. Charged residues in the F-strands explain PVRIG selectivity for Nectin-2 but not Necl-5 (CD155). Structure-guided directed evolution produced CD112R mutants (CD112RIVE) with greatly increased affinity that potently block CD112-CD112R interactions.\",\n      \"method\": \"X-ray crystallography (2.2 Å), site-directed mutagenesis, directed evolution, soluble trap blocking assay, CAR-T and TCE functional assays\",\n      \"journal\": \"Structure (London, England : 1993)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crystal structure with mutagenesis, directed evolution, and multiple functional assays in one rigorous study\",\n      \"pmids\": [\"40285356\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Crystal structure of PVRIG (CD112R) in complex with Nectin-2 reveals the molecular basis of immune recognition and selectivity. A unique CC' loop in PVRIG complements the double-lock-and-key binding mode contributing to high affinity. The corresponding charged residues in F-strands explain PVRIG selectivity toward Nectin-2 but not Necl-5.\",\n      \"method\": \"X-ray crystallography, binding affinity measurements, comparative structural analysis\",\n      \"journal\": \"Structure (London, England : 1993)\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — crystal structure of the complex with multiple structural comparisons; single rigorous study\",\n      \"pmids\": [\"38626767\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"PVRL2 (Nectin-2) suppresses antitumor immunity through PVRIG-independent and TIGIT-independent pathways: deletion of PVRL2 in syngeneic tumor models dramatically reduces tumor growth dependent on CD8+ T and NK cells. Loss of PVRL2 suppressed tumor growth even in the absence of PVRIG, and PVRIG loss showed no additive effect in the absence of PVRL2. Combined PVRL2 deletion plus TIGIT blockade achieved near-complete tumor growth suppression.\",\n      \"method\": \"PVRL2 syngeneic knockout mouse models, immune cell depletion, TIGIT blockade combination experiments\",\n      \"journal\": \"Cancer immunology research\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple syngeneic KO models, immune depletion epistasis, combination blockade; multiple orthogonal approaches\",\n      \"pmids\": [\"38588410\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"VSIG2, expressed on activated antigen-presenting cells, specifically binds to Nectin-2 and does not interact with PD-1 or CTLA-4. This VSIG2-Nectin-2 interaction strongly inhibits T cell activation and proliferation and regulates the STAT1/IRF1/GBP2 signaling pathway in T cells.\",\n      \"method\": \"Co-immunoprecipitation/binding assays, T cell activation assays, signaling pathway analysis, VSIG2-Ig protein and anti-VSIG2 antibody functional experiments\",\n      \"journal\": \"Journal of neuroinflammation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — binding specificity established, functional T cell assays, signaling pathway; single lab\",\n      \"pmids\": [\"41350674\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2025,\n      \"finding\": \"ST6GalNAc-I sialyltransferase mediates sialylation of NECTIN2 in lung adenocarcinoma cells, contributing to T cell dysfunction. ST6GalNAc-I-deficient tumor cells cocultured with T cells showed increased susceptibility to T cell-mediated killing, and mice injected with St6galnac-I-knockdown syngeneic cells showed reduced Nectin2/TIGIT-associated immunosuppression.\",\n      \"method\": \"Proteomics, biochemical sialylation assay, coculture cytotoxicity, syngeneic mouse tumor model, siRNA knockdown\",\n      \"journal\": \"The Journal of clinical investigation\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — biochemical PTM identification, functional T cell and in vivo assays; single lab\",\n      \"pmids\": [\"40371640\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"In colorectal cancer, cancer-associated fibroblasts expressing NECTIN2 inhibit effector T cells; blocking NECTIN2 receptor interaction (with cognate immune receptor) reversed T cell inhibition, demonstrating NECTIN2 as the key driver of T cell suppression by a novel TinCAF fibroblast cluster.\",\n      \"method\": \"scRNA-seq, spatial proteomics, co-culture of CAF and T cells, NECTIN2 blocking antibody, flow cytometry\",\n      \"journal\": \"Cancer letters\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — blocking antibody in co-culture with functional T cell readout; single lab\",\n      \"pmids\": [\"38821255\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2016,\n      \"finding\": \"Nectin-2 (CD112) knockdown in outgrowth endothelial cells (OECs) enhances tube formation, cell migration, and proliferation with p-ERK activation, and increases compensatory expression of Nectin-3 and Necl-4 (which promote VEGFR signaling). Blocking Nectin-2 with neutralizing mAb similarly increases trans-well migration and tube formation.\",\n      \"method\": \"siRNA knockdown, neutralizing mAb, tube formation assay, migration assay, Western blot for p-ERK, qPCR\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — KD and blocking antibody with functional phenotype and molecular readout; single lab\",\n      \"pmids\": [\"27676263\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2023,\n      \"finding\": \"Nectin2 knockdown in neuroblastoma cells reduces migration and induces apoptosis and cell cycle arrest. ANXA2 is downstream of Nectin2; its expression is reduced by Nectin2 knockdown, and ANXA2 overexpression rescues apoptosis and restores MMP2/MMP9 expression, placing Nectin2 upstream of ANXA2 in a pro-survival pathway.\",\n      \"method\": \"siRNA knockdown, RNA-seq, qRT-PCR, Western blot, rescue overexpression, apoptosis assay, migration assay\",\n      \"journal\": \"Acta biochimica et biophysica Sinica\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2–3 / Moderate — KD with rescue overexpression, multiple molecular readouts; single lab\",\n      \"pmids\": [\"36916296\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"Tumor-associated neutrophils (TANs) upregulate membranous Nectin2 expression on pancreatic ductal adenocarcinoma cells (via CCL5 secretion and endoplasmic reticulum stress), contributing to CD8+ T-cell exhaustion. Blocking Nectin2 improved CD8+ T-cell function and suppressed tumor progression in mouse models.\",\n      \"method\": \"Microarray, cytokine array, in vitro co-culture, in vivo orthotopic/subcutaneous mouse model, Nectin2 blockade, single-cell transcriptome analysis\",\n      \"journal\": \"Journal of experimental & clinical cancer research : CR\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — in vitro and in vivo functional assays with blockade; single lab\",\n      \"pmids\": [\"39261943\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"NECTIN2 (Nectin-2/CD112/PVRL2/HveB) is a cell-surface Ig-superfamily adhesion molecule that (i) forms homodimers via its V-set domain—a conformation required for binding to the activating NK/T-cell receptor DNAM-1 (CD226)—and also engages inhibitory immune receptors TIGIT and PVRIG through a conserved lock-and-key mechanism that disrupts nectin-2 oligomers; (ii) serves as a herpesvirus entry receptor through direct gD-binding via its N-terminal V domain; (iii) is essential at Sertoli-spermatid ectoplasmic specializations for cytoskeletal organization during spermiogenesis; (iv) cooperates with N-cadherin via extracellular domain interactions to drive apical F-actin accumulation; (v) is regulated post-translationally by ubiquitin-proteasome-mediated degradation and by viral gD-induced degradation or HCMV UL141-assisted proteasomal degradation, modulating NK-cell immune surveillance; and (vi) suppresses antitumor CD8+ T and NK cell responses through both PVRIG-dependent and PVRIG-independent pathways in the tumor microenvironment.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"NECTIN2 (CD112/PVRL2/HveB) is a cell-surface immunoglobulin-superfamily adhesion molecule that operates at the interface of immune regulation, cell-cell adhesion, and viral entry [#0, #10]. Its membrane-distal V-set Ig domain forms a perpendicular homodimer, and disruption of this homodimeric interface abolishes binding to the activating NK/T-cell receptor DNAM-1 (CD226), establishing that productive DNAM-1 engagement requires the homodimeric conformation [#10, #11]. The same V domain is competitively engaged by the inhibitory receptors TIGIT and PVRIG (CD112R) through a conserved antiparallel lock-and-key mode in which receptor binding disrupts pre-assembled NECTIN2 oligomers, making activating and inhibitory engagement mutually exclusive [#12, #28]. Through these axes NECTIN2 suppresses antitumor CD8+ T-cell and NK-cell responses: PVRIG–PVRL2 forms a nonredundant inhibitory node distinct from TIGIT–PVR [#17], and PVRL2 deletion in syngeneic tumors restrains growth in a CD8+ T- and NK-dependent manner even through PVRIG-independent routes, with combined TIGIT blockade approaching complete suppression [#30]. NECTIN2 also serves as a herpesvirus entry receptor, conferring susceptibility to HSV mutant strains, HSV-2, and pseudorabies virus via direct gD binding to its N-terminal V domain [#2, #7, #8]. In adhesion contexts it engages N-cadherin through an extracellular, adaptor-independent interaction to drive apical F-actin accumulation [#14, #26], and it is essential at Sertoli–spermatid ectoplasmic specializations where it forms a heterotypic complex with nectin-3 to organize the cytoskeleton during spermiogenesis [#4, #5]. Surface levels are controlled post-translationally by ubiquitin-proteasome-mediated degradation, exploited by HCMV UL141 and alphaherpesvirus gD as NK immune-evasion strategies [#15, #16, #18].\",\n  \"teleology\": [\n    {\n      \"year\": 1998,\n      \"claim\": \"Established NECTIN2 as a herpesvirus entry mediator, the first defined molecular function for the protein, explaining how certain HSV strains enter otherwise resistant cells.\",\n      \"evidence\": \"cDNA expression library screen and viral entry assay in CHO cells with antibody blocking\",\n      \"pmids\": [\"9657005\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not map the gD-binding region on NECTIN2\", \"Did not explain selectivity for mutant over wild-type HSV-1\"]\n    },\n    {\n      \"year\": 2000,\n      \"claim\": \"Defined the V domain as the gD-binding region and showed NECTIN2 supports cell-to-cell spread of mutant but not wild-type HSV-1, refining the receptor's entry specificity.\",\n      \"evidence\": \"Viral entry and spread assays in defined-receptor cells plus in vitro soluble gD binding\",\n      \"pmids\": [\"10729168\", \"10627537\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Weak/undetectable wild-type gD binding left affinity determinants unresolved\", \"Residue-level interface not yet defined\"]\n    },\n    {\n      \"year\": 2000,\n      \"claim\": \"Knockout established a physiological role in spermiogenesis, showing NECTIN2 is required for normal sperm morphology and cytoskeletal organization.\",\n      \"evidence\": \"nectin-2 knockout mice with electron microscopy and expression analysis\",\n      \"pmids\": [\"10733589\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Molecular adhesion partner at the junction not identified\", \"Downstream cytoskeletal effectors unknown\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Pinpointed critical V-domain residues (aa 75-81 and M89) for HSV entry, linking the entry interface to analogous receptor-binding regions of CD4 and CD155.\",\n      \"evidence\": \"Chimeric receptors and site-directed mutagenesis with viral entry assay\",\n      \"pmids\": [\"11602758\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No co-structure of NECTIN2 with gD\", \"Conformational basis of selectivity not resolved\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Identified NECTIN2 as a direct ligand for the activating NK receptor DNAM-1, defining its first immune effector function.\",\n      \"evidence\": \"Protein purification, mass spectrometry, Fc-fusion binding and NK cytotoxicity assays\",\n      \"pmids\": [\"12913096\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of DNAM-1 binding not defined\", \"Relationship between homophilic adhesion and receptor engagement unclear\"]\n    },\n    {\n      \"year\": 2003,\n      \"claim\": \"Showed NECTIN2/nectin-3 form a heterotypic Sertoli-spermatid adhesion complex required for ectoplasmic specialization assembly, mechanistically linking the knockout phenotype to junction formation.\",\n      \"evidence\": \"LacZ knockin knockout mice with espin immunolocalization and binding assays\",\n      \"pmids\": [\"12801998\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Intracellular signaling driving actin bundling not defined\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Established TIGIT as a direct inhibitory receptor for NECTIN2 acting via its ITIM, providing an MHC-independent 'alternative self' brake on NK cytotoxicity.\",\n      \"evidence\": \"Binding assays, ITIM functional analysis and NK cytotoxicity assays\",\n      \"pmids\": [\"19815499\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural interface not yet defined\", \"Competition with DNAM-1 not yet demonstrated\"]\n    },\n    {\n      \"year\": 2009,\n      \"claim\": \"Revealed a cardiac role: NECTIN2 maintains intercalated disc integrity under pressure overload via Akt/JNK/p38 signaling, extending function beyond immunity and reproduction.\",\n      \"evidence\": \"Knockout mice with aortic banding, histology and phospho-kinase Western blots\",\n      \"pmids\": [\"19667252\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Direct adhesion partner at the intercalated disc not identified\", \"Mechanism linking adhesion to kinase signaling unresolved\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Demonstrated an extracellular NECTIN2-N-cadherin interaction driving apical constriction and F-actin accumulation, defining a cooperative adhesion mechanism in morphogenesis.\",\n      \"evidence\": \"Morpholino knockdown, overexpression, co-IP and domain dissection in Xenopus\",\n      \"pmids\": [\"20332149\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Affinity and interface not quantified in this study\", \"Link to actin machinery not molecularly defined\"]\n    },\n    {\n      \"year\": 2010,\n      \"claim\": \"Showed HCMV downregulates surface NECTIN2 via proteasomal degradation requiring UL141 plus additional viral functions, defining a viral immune-evasion mechanism distinct from CD155 retention.\",\n      \"evidence\": \"HCMV UL141-deletion mutant, proteasome inhibitor assays and flow cytometry\",\n      \"pmids\": [\"20410314\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Additional HCMV factors required for NECTIN2 suppression not identified\", \"E3 ligase mediating degradation unknown\"]\n    },\n    {\n      \"year\": 2012,\n      \"claim\": \"Crystal structures established the NECTIN2 V-domain homodimer and showed DNAM-1 binding requires the homodimeric interface, unifying adhesion conformation with receptor engagement.\",\n      \"evidence\": \"X-ray crystallography (1.85 and 1.3 A), mutagenesis, SPR and tetramer staining\",\n      \"pmids\": [\"22547693\", \"22927415\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Did not address how inhibitory receptors compete with homodimer\", \"Full-length ectodomain architecture not resolved\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Showed alphaherpesvirus gD degrades NECTIN2 to reduce DNAM-1 binding and NK killing, mechanistically uniting the entry receptor and immune-evasion roles.\",\n      \"evidence\": \"Virus infection and gD transfection with NK degranulation and cytotoxicity assays\",\n      \"pmids\": [\"25352670\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Degradation route (proteasome vs lysosome) not fully defined\", \"gD residues mediating degradation not mapped\"]\n    },\n    {\n      \"year\": 2014,\n      \"claim\": \"Identified dual transcriptional and post-translational control of NECTIN2 by cadmium, implicating CREB/c-Jun/Sp1 promoter regulation and clathrin-dependent endocytosis.\",\n      \"evidence\": \"EMSA, ChIP, endocytosis inhibitor and clathrin shRNA assays\",\n      \"pmids\": [\"25046863\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Single-lab study\", \"Physiological relevance beyond cadmium exposure unclear\"]\n    },\n    {\n      \"year\": 2017,\n      \"claim\": \"Defined the TIGIT:NECTIN2 lock-and-key structure and showed TIGIT binding disrupts NECTIN2 oligomers, establishing mutual exclusivity of activating and inhibitory engagement.\",\n      \"evidence\": \"X-ray crystallography, SPR and biochemical oligomer-disruption assays\",\n      \"pmids\": [\"28515320\", \"27978489\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In situ competition between DNAM-1 and TIGIT not directly visualized\", \"Affinity (~6 uM) physiological tuning unresolved\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Established PVRIG (CD112R) as a nonredundant inhibitory receptor for NECTIN2 on CD8+ T cells, distinct from the TIGIT axis and a candidate combination immunotherapy target.\",\n      \"evidence\": \"Blocking antibody T-cell cytokine/cytotoxicity and TIL functional assays\",\n      \"pmids\": [\"30659054\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Structural basis of PVRIG selectivity not yet defined\", \"PVRIG-independent NECTIN2 effects not yet examined\"]\n    },\n    {\n      \"year\": 2019,\n      \"claim\": \"Showed ubiquitin-proteasome degradation governs NECTIN2 surface levels and tumor cell susceptibility to NK killing, defining an endogenous post-translational control point.\",\n      \"evidence\": \"Ubiquitination assay, proteasome inhibitor treatment and NK cytotoxicity\",\n      \"pmids\": [\"30888046\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Responsible E3 ligase not identified\", \"Single-lab study\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Solved the PVRIG:NECTIN2 complex structure, explaining PVRIG selectivity and homodimer disruption, and enabling high-affinity blocking variants for therapy.\",\n      \"evidence\": \"X-ray crystallography (2.2 A), mutagenesis, directed evolution and CAR-T/TCE functional assays\",\n      \"pmids\": [\"40285356\", \"38626767\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"In vivo efficacy of engineered variants not established here\", \"Full ectodomain context not resolved\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Demonstrated PVRL2 suppresses antitumor immunity through PVRIG- and TIGIT-independent pathways, establishing it as an upstream node whose deletion combined with TIGIT blockade nearly abolishes tumor growth.\",\n      \"evidence\": \"Syngeneic PVRL2-knockout tumor models, immune-cell depletion epistasis and combination blockade\",\n      \"pmids\": [\"38588410\"],\n      \"confidence\": \"High\",\n      \"gaps\": [\"Identity of the PVRIG/TIGIT-independent receptor unresolved\", \"Mechanism of PVRIG-independent suppression undefined\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Identified stromal sources of NECTIN2-mediated T-cell suppression in tumors, showing fibroblasts and tumor-associated neutrophil-induced NECTIN2 drive CD8+ T-cell dysfunction reversible by blockade.\",\n      \"evidence\": \"scRNA-seq, spatial proteomics, CAF/TAN-tumor-T cell co-culture and in vivo blockade\",\n      \"pmids\": [\"38821255\", \"39261943\"],\n      \"confidence\": \"Medium\",\n      \"gaps\": [\"Receptor mediating suppression in these contexts not always defined\", \"Single-lab studies\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"The identity of the receptor(s) and signaling mechanism underlying NECTIN2's PVRIG- and TIGIT-independent immunosuppression, and the E3 ligase(s) controlling its proteasomal turnover, remain unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"High\",\n      \"gaps\": [\"No defined receptor for the PVRIG/TIGIT-independent tumor pathway\", \"Ubiquitin ligase regulating NECTIN2 surface levels unidentified\", \"No unified structural model of full ectodomain in cis/trans\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0098631\", \"supporting_discovery_ids\": [5, 14, 26]},\n      {\"term_id\": \"GO:0001618\", \"supporting_discovery_ids\": [2, 7, 27]},\n      {\"term_id\": \"GO:0048018\", \"supporting_discovery_ids\": [0, 3, 12, 17]},\n      {\"term_id\": \"GO:0098772\", \"supporting_discovery_ids\": [17, 30]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [0, 2, 5, 14, 15]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [0, 3, 17, 30]},\n      {\"term_id\": \"R-HSA-1500931\", \"supporting_discovery_ids\": [5, 14, 26]},\n      {\"term_id\": \"R-HSA-1643685\", \"supporting_discovery_ids\": [2, 15, 16, 30]}\n    ],\n    \"complexes\": [\n      \"NECTIN2-nectin-3 Sertoli-spermatid adhesion complex\"\n    ],\n    \"partners\": [\n      \"DNAM-1\",\n      \"TIGIT\",\n      \"PVRIG\",\n      \"N-cadherin\",\n      \"nectin-3\",\n      \"VSIG2\"\n    ],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":7,"faith_total":7,"faith_pct":100.0}}