{"gene":"CD8B","run_date":"2026-06-09T22:57:18","timeline":{"discoveries":[{"year":2001,"finding":"The cytoplasmic portion of CD8β, primarily due to its palmitoylation, mediates partitioning of CD8 into lipid rafts, where it efficiently associates with p56(lck). The cytoplasmic portion of CD8β also mediates constitutive association of CD8 with TCR/CD3, and because CD8αβ partitions in rafts, its interaction with TCR/CD3 promotes raft association of TCR/CD3. Engagement of these TCR/CD3-CD8/lck adducts by multimeric MHC-peptide induces activation of p56(lck) in rafts, which phosphorylates CD3 and initiates T cell activation.","method":"TCR photoaffinity labeling, transfection of CD8β cytoplasmic mutants into T1.4 hybridomas, lipid raft fractionation, co-immunoprecipitation","journal":"The Journal of experimental medicine","confidence":"High","confidence_rationale":"Tier 1–2 / Strong — multiple orthogonal methods (photoaffinity labeling, mutagenesis, raft fractionation, co-IP) in a single rigorous study establishing the mechanism of palmitoylation-dependent raft partitioning and lck association","pmids":["11714755"],"is_preprint":false},{"year":2000,"finding":"The CD8β extracellular domain increases the avidity of CD8 binding to MHC class I, and the intracellular domain of CD8β enhances association with Lck and LAT, two intracellular signaling molecules required for TCR signal transduction. Both the intracellular and extracellular domains of CD8β can contribute independently to CD8+ T cell development in vivo, but together are most efficient.","method":"In vivo reconstitution of CD8β-deficient mice with transgenic CD8β chimeric molecules, MHC I binding avidity assays, co-immunoprecipitation for Lck and LAT association","journal":"Immunity","confidence":"High","confidence_rationale":"Tier 2 / Strong — domain-swap chimera approach in vivo plus biochemical co-IP, multiple orthogonal methods identifying distinct contributions of each domain","pmids":["10795739"],"is_preprint":false},{"year":2002,"finding":"CD8β core type-1 O-glycans on threonine residues proximal to the CD8β Ig headpiece are sialylated by ST3Gal-1 sialyltransferase during thymic maturation. Non-sialylated glycoforms are present in immature thymocytes but absent in mature thymocytes, and this sialylation creates a molecular developmental switch that affects MHC class I ligand binding avidity.","method":"Electrospray mass spectrometry (ES-MS) and tandem MS/MS analysis of CD8β glycopeptides from immature and mature thymocytes","journal":"The Journal of biological chemistry","confidence":"High","confidence_rationale":"Tier 1 / Strong — direct structural characterization of glycoforms by MS/MS with identification of specific glycosylation sites and the responsible enzyme (ST3Gal-1), rigorous biochemical methods","pmids":["12459555"],"is_preprint":false},{"year":1998,"finding":"The extracellular portion of CD8β is capable of independent interaction with MHC class I/β2-microglobulin dimers in the absence of CD8α, and CD8β may further enhance interaction with MHC class I/β2m when associated with CD8α. Additionally, the extracellular portion of CD8β is uniquely capable of efficient interaction with the TCR/CD3 complex, coupling it to surface components that enhance TCR-mediated signals.","method":"T hybridoma responses to alloantigen, chimeric CD8β-α molecules (extracellular CD8β, transmembrane/cytoplasmic CD8α), binding assays","journal":"Journal of immunology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — chimeric molecule approach with functional T hybridoma readout and binding data, single lab but two orthogonal methods","pmids":["9574520"],"is_preprint":false},{"year":1999,"finding":"The ectodomain of CD8β greatly enhances the coreceptor function of CD8αβ relative to CD8αα homodimers, conferring ~100-fold greater sensitivity to peptide antigen-induced IL-2 production; this enhancement is independent of both CD8α and CD8β cytoplasmic tails, as demonstrated by cytoplasmic deletion mutants.","method":"Transfection of CD8α alone or with CD8β cDNA into mouse T cell hybridoma N15wt; analysis of IL-2 production with cytoplasmic deletion mutants","journal":"Cellular immunology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — functional assay with cytoplasmic deletion mutants demonstrating ectodomain-dependent enhancement, single lab","pmids":["9973530"],"is_preprint":false},{"year":1988,"finding":"CD8β (Ly-3) requires CD8α (Ly-2) for cell surface expression; transfection of the Ly-3 gene alone does not result in detectable surface expression of Ly-3 antigenic determinants, whereas co-transfection with Ly-2 results in surface expression. Conversely, Ly-2 surface expression is not dependent on Ly-3.","method":"Gene transfection into mouse L cells, flow cytometry with monoclonal antibodies","journal":"Journal of immunology","confidence":"High","confidence_rationale":"Tier 2 / Strong — independently replicated across multiple labs (PMID 3258885, 3145196, 2452747) using transfection assays with consistent findings","pmids":["3258885","3145196","2452747"],"is_preprint":false},{"year":2013,"finding":"ART2.2 (ADP-ribosyl transferase 2.2) uses extracellular NAD+ to ADP-ribosylate CD8β on arginine residues of its extracellular domain on murine CD8+ T cells. This modification prevents binding of anti-CD8β mAb YTS156.7.7, interferes with MHC-I tetramer binding, and reduces CD8+ T-cell-mediated cytotoxicity in vivo.","method":"In vitro and in vivo NAD+ treatment of murine CD8+ T cells, ART2-deficient mice, inhibitory anti-ART2.2 single-domain antibodies, OVA:MHC-I tetramer binding assay, in vivo cytotoxicity assay","journal":"European journal of immunology","confidence":"High","confidence_rationale":"Tier 2 / Strong — multiple orthogonal methods including genetic knockout controls, specific inhibitory antibodies, and functional in vivo readout in a single rigorous study","pmids":["23575529"],"is_preprint":false},{"year":2008,"finding":"Human CD8β splice variants (M-1, M-2, M-3, M-4) differ in expression patterns across T cell subsets: M-1 is predominant in naïve T cells, M-4 is predominant in effector memory T cells, and M-2 mRNA is elevated 10–20-fold upon T cell stimulation. The M-2 isoform is targeted to a lysosomal compartment via ubiquitination of lysine K215 in its cytoplasmic tail; upon short-term stimulation, M-2 localizes to the cell surface with the TCR complex.","method":"Quantitative RT-PCR in primary human T cells; fluorescent chimera localization by confocal microscopy in transfected cell lines; ubiquitination assay","journal":"Journal of immunology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods (qRT-PCR, live imaging, ubiquitination assay) in a single lab","pmids":["18490743"],"is_preprint":false},{"year":2013,"finding":"The CD8β M-4 isoform contains a dihydrophobic leucine-based receptor internalization motif in its cytoplasmic tail that regulates cell surface expression and downregulation after activation. The M-4 cytoplasmic tail associates with ubiquitinated targets, is itself mono-ubiquitinated on a lysine residue, and contains an NPW motif (potential EH domain binding site) that modulates ubiquitinated target interaction. T cells expressing CD8αβ M-4 showed twofold higher frequency of MIP-1β secreting cells responding to antigen compared to M-1 expressing T cells.","method":"Mutagenesis of leucine-based motif and NPW motif, ubiquitination assays in 293T cells and human T cell line, functional cytokine secretion assay with primary peripheral blood T cells","journal":"PloS one","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — mutagenesis combined with functional and biochemical assays, single lab","pmids":["23533620"],"is_preprint":false},{"year":1981,"finding":"Lyt-2 (CD8α) and Lyt-3 (CD8β) antigens are carried on separate disulfide-bonded subunits of the same cell surface macromolecule, present as dimers, tetramers, and hexamers on thymocytes. Selective tryptic removal of Lyt-3 (CD8β) from cytotoxic effector cells does not abolish cytotoxic activity, but reduces blocking by anti-Lyt-3 while increasing blocking by anti-Lyt-2, suggesting CD8β modulates but is not essential for cytolytic activity.","method":"Monoclonal antibody precipitation, SDS-PAGE, 2D gel electrophoresis, protease treatment of effector cells, cytotoxicity blocking assay","journal":"The Journal of experimental medicine","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — biochemical characterization of subunit composition with functional blocking assay, foundational study with multiple methods","pmids":["6166718"],"is_preprint":false},{"year":1999,"finding":"During human intrathymic development, CD8β expression is acquired after CD8α and coincides with expression of cytoplasmic TCRβ chain (TCRβic) and surface CD3 and pre-TCRα. CD8β onset marks the transition associated with pre-TCR-mediated beta-selection, and CD8αβ heterodimers are selectively found on DP thymocytes that have undergone pre-TCR signaling.","method":"In vivo analysis of human thymocyte subsets; multicolor flow cytometry; correlation of CD8β with TCRβic and proliferative status","journal":"Blood","confidence":"Medium","confidence_rationale":"Tier 3 / Moderate — direct localization/expression analysis in primary human thymocytes with multiple cell surface and intracellular markers, single lab but comprehensive phenotyping","pmids":["10552959"],"is_preprint":false},{"year":2024,"finding":"IL-15 induces cell-cycle-dependent down-modulation of CD8β from the surface of human naïve CD8+ T cells, generating CD8αβlow and CD8αα T cells. This is associated with a decrease in mRNA of the CD8β M-4 isoform while M-1/M-2 isoform and CD8α mRNA levels increase. CD8+ T cell blasts generated by IL-15 show increased Lck levels, distinct from cells cultured with IL-2 or IL-7.","method":"CFSE labeling, flow cytometry, qPCR for CD8α and CD8β isoforms, intracellular Lck staining, cytokine comparison (IL-2, IL-7, IL-15)","journal":"Frontiers in immunology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — multiple orthogonal methods (flow cytometry, qPCR, intracellular staining) in primary human cells, single lab","pmids":["38903513"],"is_preprint":false},{"year":2008,"finding":"In CD8β knockout mice, CD8+ T cells mount normal primary, secondary, and memory responses to acute LCMV infection because CD8-independent TCRs are preferentially selected in the absence of CD8β, effectively compensating for reduced coreceptor function of CD8αα. The TCR repertoire, particularly the TCRα chain, differs between CD8β KO and wild-type mice.","method":"CD8β knockout mice, tetramer staining, cytotoxicity assays, TCR repertoire analysis, LCMV infection model","journal":"International immunology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — genetic KO model with multiple functional readouts (tetramer, cytotoxicity, TCR repertoire) demonstrating compensatory selection mechanism, single lab","pmids":["19088062"],"is_preprint":false},{"year":1998,"finding":"Cross-linking of macrophage CD8β (in addition to CD8α) stimulates nitric oxide production and upregulation of inducible NO synthase. This signaling through CD8β is inhibited by broad-spectrum protein tyrosine kinase inhibitors (genistein), src-family kinase inhibitor (PP1), and PKC inhibitors, indicating involvement of src-family tyrosine kinases and PKC downstream of CD8β.","method":"Antibody cross-linking of rat macrophage CD8β, NO production assay, iNOS Western blot, pharmacological inhibitors of kinase pathways","journal":"Journal of immunology","confidence":"Medium","confidence_rationale":"Tier 2 / Moderate — direct biochemical signaling assay with multiple pharmacological inhibitors establishing pathway components, single lab","pmids":["9637515"],"is_preprint":false}],"current_model":"CD8β (CD8B) functions as the β subunit of the CD8αβ coreceptor on cytotoxic T cells: its extracellular Ig-like domain directly enhances avidity of CD8 binding to MHC class I (including independently binding MHC I/β2m dimers), its cytoplasmic tail undergoes palmitoylation that drives partitioning into lipid rafts and constitutive association with p56(lck) and TCR/CD3, thereby coupling the TCR complex to lck-mediated signaling; O-glycan sialylation of the CD8β stalk region by ST3Gal-1 provides a developmental switch modulating MHC I binding during thymic maturation; CD8β surface expression strictly requires co-expression of CD8α; human CD8B encodes four alternatively spliced isoforms (M-1 to M-4) with distinct cytoplasmic tails that differ in subcellular trafficking, ubiquitination, and functional coupling in naïve versus effector memory T cells; and CD8β is subject to ADP-ribosylation by ART2.2, which impairs MHC-I tetramer binding and in vivo cytotoxicity."},"narrative":{"mechanistic_narrative":"CD8B encodes the β subunit of the CD8αβ coreceptor that endows cytotoxic T cells with sensitive recognition of peptide–MHC class I antigen [PMID:9973530]. Its extracellular Ig-like domain directly engages MHC class I/β2-microglobulin and raises the avidity of CD8 binding, while also coupling efficiently to the TCR/CD3 complex; both ectodomain and cytoplasmic functions contribute to CD8+ T cell development in vivo [PMID:10795739, PMID:9574520, PMID:9973530]. The cytoplasmic tail of CD8β is palmitoylated, which partitions the coreceptor into lipid rafts where it associates constitutively with p56(lck) and with TCR/CD3, so that MHC-peptide engagement activates raft-localized Lck to phosphorylate CD3 and initiate signaling [PMID:11714755, PMID:10795739]. Surface display of CD8β is strictly dependent on co-expression of CD8α, with which it forms disulfide-bonded heterodimers and higher-order oligomers [PMID:3258885, PMID:3145196, PMID:2452747, PMID:6166718]. CD8β function is further tuned by post-translational and developmental controls: ST3Gal-1–mediated sialylation of stalk O-glycans acts as a thymic maturation switch modulating MHC I binding avidity [PMID:12459555], ART2.2-catalyzed ADP-ribosylation of extracellular arginines impairs MHC-I tetramer binding and in vivo cytotoxicity [PMID:23575529], and CD8β onset during human thymopoiesis coincides with pre-TCR signaling and β-selection [PMID:10552959]. Human CD8B produces alternatively spliced isoforms with distinct cytoplasmic tails (M-1 to M-4) that differ in T cell subset distribution, ubiquitination-driven trafficking, internalization, and functional output [PMID:18490743, PMID:23533620].","teleology":[{"year":1981,"claim":"Established that CD8 is a multi-subunit cell surface molecule in which CD8β (Lyt-3) is a distinct disulfide-bonded chain that modulates, but is not strictly required for, cytolytic activity.","evidence":"mAb precipitation, 2D gel electrophoresis, protease stripping, and cytotoxicity blocking on murine effector cells","pmids":["6166718"],"confidence":"Medium","gaps":["Did not define the molecular basis of CD8β's contribution to MHC binding or signaling","Subunit stoichiometry of dimers/tetramers/hexamers not functionally dissected"]},{"year":1988,"claim":"Answered why CD8β does not appear alone by showing its surface expression requires CD8α, defining an obligate assembly dependency.","evidence":"Transfection of Ly-3 alone versus Ly-2/Ly-3 co-transfection into mouse L cells with flow cytometry","pmids":["3258885","3145196","2452747"],"confidence":"High","gaps":["Trafficking/folding step at which CD8α is required was not identified","Did not address functional role of the heterodimer"]},{"year":1998,"claim":"Distinguished the ectodomain contribution of CD8β, showing it independently binds MHC I/β2m and uniquely couples to TCR/CD3.","evidence":"Chimeric CD8β/α molecules and binding assays with T hybridoma alloantigen responses","pmids":["9574520"],"confidence":"Medium","gaps":["Affinities and binding geometry not quantified","Single-lab functional readout without structural data"]},{"year":1999,"claim":"Quantified the coreceptor advantage of CD8αβ over CD8αα, showing the CD8β ectodomain confers ~100-fold greater antigen sensitivity independent of cytoplasmic tails.","evidence":"Transfection of CD8α with/without CD8β and cytoplasmic deletion mutants in N15wt hybridoma, IL-2 readout","pmids":["9973530"],"confidence":"Medium","gaps":["Mechanism by which ectodomain enhances avidity not resolved at molecular level","Single cell-line system"]},{"year":1999,"claim":"Placed CD8β acquisition in developmental context, showing its onset coincides with pre-TCR signaling and β-selection during human thymopoiesis.","evidence":"Multicolor flow cytometry of primary human thymocyte subsets correlated with intracellular TCRβ and pre-TCRα","pmids":["10552959"],"confidence":"Medium","gaps":["Correlative; causal link between CD8β onset and β-selection not tested","Transcriptional regulators of timing not identified"]},{"year":2000,"claim":"Dissected in vivo the division of labor between CD8β domains, showing the ectodomain raises MHC I avidity while the cytoplasmic tail enhances Lck and LAT association, with both contributing to CD8+ T cell development.","evidence":"Reconstitution of CD8β-deficient mice with chimeric transgenes, avidity assays, co-IP for Lck/LAT","pmids":["10795739"],"confidence":"High","gaps":["Did not resolve the biochemical step linking cytoplasmic tail to Lck/LAT recruitment","Relative quantitative contributions in mature effector function not separated"]},{"year":2001,"claim":"Defined the signaling mechanism: palmitoylation of the CD8β cytoplasmic tail drives raft partitioning, constitutive p56(lck) and TCR/CD3 association, and Lck activation upon MHC-peptide engagement.","evidence":"TCR photoaffinity labeling, CD8β cytoplasmic mutants in T1.4 hybridomas, raft fractionation, co-IP","pmids":["11714755"],"confidence":"High","gaps":["Palmitoyl-transferase responsible not identified","Dynamics of raft entry/exit during signaling not measured"]},{"year":2002,"claim":"Identified a glycan-based developmental switch: ST3Gal-1 sialylation of CD8β stalk O-glycans during thymic maturation alters MHC I binding avidity.","evidence":"ES-MS and MS/MS of CD8β glycopeptides from immature versus mature thymocytes","pmids":["12459555"],"confidence":"High","gaps":["Functional consequence on selection thresholds not directly tested","Whether sialylation is reversed in peripheral effector cells unknown"]},{"year":2008,"claim":"Revealed isoform diversity, showing human CD8β splice variants are differentially distributed across T cell subsets, with M-2 trafficked to a lysosomal compartment via cytoplasmic ubiquitination at K215.","evidence":"qRT-PCR in primary human T cells, confocal localization of chimeras, ubiquitination assay","pmids":["18490743"],"confidence":"Medium","gaps":["Functional impact of isoform-specific trafficking on signaling not established","Ubiquitin ligase not identified"]},{"year":2008,"claim":"Showed CD8β is not strictly essential, as CD8β-knockout mice mount normal antiviral responses by preferentially selecting CD8-independent TCRs.","evidence":"CD8β KO mice, tetramer staining, cytotoxicity, TCR repertoire analysis in LCMV infection","pmids":["19088062"],"confidence":"Medium","gaps":["Compensatory repertoire shift mechanism not molecularly defined","May not generalize to CD8-dependent or chronic antigens"]},{"year":2013,"claim":"Defined isoform-specific trafficking control and effector tuning, showing the M-4 cytoplasmic tail uses a leucine-based internalization motif and mono-ubiquitination to regulate surface expression and enhance antigen-induced cytokine secretion.","evidence":"Mutagenesis of leucine and NPW motifs, ubiquitination assays in 293T and human T cells, MIP-1β secretion assay","pmids":["23533620"],"confidence":"Medium","gaps":["EH-domain partner of the NPW motif not identified","Mechanistic link from trafficking to enhanced cytokine output unresolved"]},{"year":2013,"claim":"Identified ADP-ribosylation as a post-translational off-switch, showing ART2.2 modifies extracellular arginines of CD8β to impair MHC-I tetramer binding and in vivo cytotoxicity.","evidence":"NAD+ treatment of murine CD8+ T cells, ART2-deficient mice, inhibitory anti-ART2.2 nanobodies, tetramer binding and in vivo cytotoxicity assays","pmids":["23575529"],"confidence":"High","gaps":["Specific modified arginine residues not mapped","Physiological contexts of extracellular NAD+ exposure not defined"]},{"year":2024,"claim":"Linked cytokine environment to coreceptor remodeling, showing IL-15 drives cell-cycle-dependent CD8β down-modulation and isoform mRNA shifts, generating CD8αβlow/CD8αα cells with elevated Lck.","evidence":"CFSE labeling, flow cytometry, qPCR for CD8α/CD8β isoforms, intracellular Lck staining across IL-2/IL-7/IL-15","pmids":["38903513"],"confidence":"Medium","gaps":["Functional consequence of IL-15-driven CD8β loss on T cell function not established","Signaling pathway from IL-15 to isoform switch unknown"]},{"year":null,"claim":"How the multiple post-translational and isoform-level controls on CD8β (palmitoylation, sialylation, ADP-ribosylation, ubiquitination, splicing) are integrated to set coreceptor avidity and signaling thresholds across development and effector states remains unresolved.","evidence":"","pmids":[],"confidence":"Medium","gaps":["No structural model integrating glycan/ADP-ribosylation effects on MHC binding","Enzymes for palmitoylation and isoform ubiquitination unidentified","Interplay between cytokine-driven down-modulation and antigen sensitivity untested"]}],"mechanism_profile":{"molecular_activity":[{"term_id":"GO:0060089","term_label":"molecular transducer activity","supporting_discovery_ids":[0,1,4]},{"term_id":"GO:0098631","term_label":"cell adhesion mediator activity","supporting_discovery_ids":[1,3]}],"localization":[{"term_id":"GO:0005886","term_label":"plasma membrane","supporting_discovery_ids":[0,5,7]},{"term_id":"GO:0005764","term_label":"lysosome","supporting_discovery_ids":[7]}],"pathway":[{"term_id":"R-HSA-168256","term_label":"Immune System","supporting_discovery_ids":[0,1,6]},{"term_id":"R-HSA-162582","term_label":"Signal Transduction","supporting_discovery_ids":[0,13]},{"term_id":"R-HSA-1266738","term_label":"Developmental Biology","supporting_discovery_ids":[1,10]}],"complexes":["CD8αβ coreceptor","TCR/CD3 complex"],"partners":["CD8A","LCK","LAT","ST3GAL1","ART2.2"],"other_free_text":[]}},"prefetch_data":{"uniprot":{"accession":"P10966","full_name":"T-cell surface glycoprotein CD8 beta chain","aliases":[],"length_aa":210,"mass_kda":23.7,"function":"Integral membrane glycoprotein that plays an essential role in the immune response and serves multiple functions in responses against both external and internal offenses. In T-cells, functions primarily as a coreceptor for MHC class I molecule:peptide complex. The antigens presented by class I peptides are derived from cytosolic proteins while class II derived from extracellular proteins. Interacts simultaneously with the T-cell receptor (TCR) and the MHC class I proteins presented by antigen presenting cells (APCs). In turn, recruits the Src kinase LCK to the vicinity of the TCR-CD3 complex. A palmitoylation site in the cytoplasmic tail of CD8B chain contributes to partitioning of CD8 into the plasma membrane lipid rafts where signaling proteins are enriched. Once LCK recruited, it initiates different intracellular signaling pathways by phosphorylating various substrates ultimately leading to lymphokine production, motility, adhesion and activation of cytotoxic T-lymphocytes (CTLs). Additionally, plays a critical role in thymic selection of CD8+ T-cells","subcellular_location":"Secreted","url":"https://www.uniprot.org/uniprotkb/P10966/entry"},"depmap":{"release":"DepMap","has_data":true,"is_common_essential":false,"resolved_as":"","url":"https://depmap.org/portal/gene/CD8B","classification":"Not Classified","n_dependent_lines":1,"n_total_lines":74,"dependency_fraction":0.013513513513513514},"opencell":{"profiled":false,"resolved_as":"","ensg_id":"","cell_line_id":"","localizations":[],"interactors":[],"url":"https://opencell.sf.czbiohub.org/search/CD8B","total_profiled":1310},"omim":[{"mim_id":"606846","title":"SET AND MYND DOMAIN-CONTAINING PROTEIN 1; SMYD1","url":"https://www.omim.org/entry/606846"},{"mim_id":"605165","title":"ZINC FINGER PROTEIN 278; ZNF278","url":"https://www.omim.org/entry/605165"},{"mim_id":"188850","title":"TL ANTIGEN","url":"https://www.omim.org/entry/188850"},{"mim_id":"186910","title":"CD8 ANTIGEN, ALPHA POLYPEPTIDE; CD8A","url":"https://www.omim.org/entry/186910"},{"mim_id":"186730","title":"CD8 ANTIGEN, BETA POLYPEPTIDE; CD8B","url":"https://www.omim.org/entry/186730"}],"hpa":{"profiled":true,"resolved_as":"","reliability":"Supported","locations":[{"location":"Plasma membrane","reliability":"Supported"}],"tissue_specificity":"Tissue enriched","tissue_distribution":"Detected in many","driving_tissues":[{"tissue":"lymphoid tissue","ntpm":427.3}],"url":"https://www.proteinatlas.org/search/CD8B"},"hgnc":{"alias_symbol":["Ly-3","LYT3","P37","CD8beta"],"prev_symbol":["CD8B1"]},"alphafold":{"accession":"P10966","domains":[{"cath_id":"2.60.40.10","chopping":"19-136","consensus_level":"high","plddt":90.3249,"start":19,"end":136},{"cath_id":"1.20.5","chopping":"181-210","consensus_level":"medium","plddt":89.1847,"start":181,"end":210}],"viewer_url":"https://alphafold.ebi.ac.uk/entry/P10966","model_url":"https://alphafold.ebi.ac.uk/files/AF-P10966-F1-model_v6.cif","pae_url":"https://alphafold.ebi.ac.uk/files/AF-P10966-F1-predicted_aligned_error_v6.png","plddt_mean":82.06},"mouse_models":{"mgi_url":"https://www.informatics.jax.org/marker/summary?nomen=CD8B","jax_strain_url":"https://www.jax.org/strain/search?query=CD8B"},"sequence":{"accession":"P10966","fasta_url":"https://rest.uniprot.org/uniprotkb/P10966.fasta","uniprot_url":"https://www.uniprot.org/uniprotkb/P10966/entry","alphafold_viewer_url":"https://alphafold.ebi.ac.uk/entry/P10966"}},"corpus_meta":[{"pmid":"11714755","id":"PMC_11714755","title":"CD8beta endows CD8 with efficient coreceptor function by coupling T cell receptor/CD3 to raft-associated CD8/p56(lck) complexes.","date":"2001","source":"The Journal of experimental medicine","url":"https://pubmed.ncbi.nlm.nih.gov/11714755","citation_count":173,"is_preprint":false},{"pmid":"6166718","id":"PMC_6166718","title":"Lyt-2 and lyt-3 antigens are on two different polypeptide subunits linked by disulfide bonds. Relationship of subunits to T cell cytolytic activity.","date":"1981","source":"The Journal of experimental medicine","url":"https://pubmed.ncbi.nlm.nih.gov/6166718","citation_count":170,"is_preprint":false},{"pmid":"15829311","id":"PMC_15829311","title":"Characterisation of salmon and trout CD8alpha and CD8beta.","date":"2005","source":"Molecular immunology","url":"https://pubmed.ncbi.nlm.nih.gov/15829311","citation_count":134,"is_preprint":false},{"pmid":"3258885","id":"PMC_3258885","title":"Molecular linkage of the Ly-3 and Ly-2 genes. 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The cytoplasmic portion of CD8β also mediates constitutive association of CD8 with TCR/CD3, and because CD8αβ partitions in rafts, its interaction with TCR/CD3 promotes raft association of TCR/CD3. Engagement of these TCR/CD3-CD8/lck adducts by multimeric MHC-peptide induces activation of p56(lck) in rafts, which phosphorylates CD3 and initiates T cell activation.\",\n      \"method\": \"TCR photoaffinity labeling, transfection of CD8β cytoplasmic mutants into T1.4 hybridomas, lipid raft fractionation, co-immunoprecipitation\",\n      \"journal\": \"The Journal of experimental medicine\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1–2 / Strong — multiple orthogonal methods (photoaffinity labeling, mutagenesis, raft fractionation, co-IP) in a single rigorous study establishing the mechanism of palmitoylation-dependent raft partitioning and lck association\",\n      \"pmids\": [\"11714755\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2000,\n      \"finding\": \"The CD8β extracellular domain increases the avidity of CD8 binding to MHC class I, and the intracellular domain of CD8β enhances association with Lck and LAT, two intracellular signaling molecules required for TCR signal transduction. Both the intracellular and extracellular domains of CD8β can contribute independently to CD8+ T cell development in vivo, but together are most efficient.\",\n      \"method\": \"In vivo reconstitution of CD8β-deficient mice with transgenic CD8β chimeric molecules, MHC I binding avidity assays, co-immunoprecipitation for Lck and LAT association\",\n      \"journal\": \"Immunity\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — domain-swap chimera approach in vivo plus biochemical co-IP, multiple orthogonal methods identifying distinct contributions of each domain\",\n      \"pmids\": [\"10795739\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2002,\n      \"finding\": \"CD8β core type-1 O-glycans on threonine residues proximal to the CD8β Ig headpiece are sialylated by ST3Gal-1 sialyltransferase during thymic maturation. Non-sialylated glycoforms are present in immature thymocytes but absent in mature thymocytes, and this sialylation creates a molecular developmental switch that affects MHC class I ligand binding avidity.\",\n      \"method\": \"Electrospray mass spectrometry (ES-MS) and tandem MS/MS analysis of CD8β glycopeptides from immature and mature thymocytes\",\n      \"journal\": \"The Journal of biological chemistry\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 1 / Strong — direct structural characterization of glycoforms by MS/MS with identification of specific glycosylation sites and the responsible enzyme (ST3Gal-1), rigorous biochemical methods\",\n      \"pmids\": [\"12459555\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"The extracellular portion of CD8β is capable of independent interaction with MHC class I/β2-microglobulin dimers in the absence of CD8α, and CD8β may further enhance interaction with MHC class I/β2m when associated with CD8α. Additionally, the extracellular portion of CD8β is uniquely capable of efficient interaction with the TCR/CD3 complex, coupling it to surface components that enhance TCR-mediated signals.\",\n      \"method\": \"T hybridoma responses to alloantigen, chimeric CD8β-α molecules (extracellular CD8β, transmembrane/cytoplasmic CD8α), binding assays\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — chimeric molecule approach with functional T hybridoma readout and binding data, single lab but two orthogonal methods\",\n      \"pmids\": [\"9574520\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"The ectodomain of CD8β greatly enhances the coreceptor function of CD8αβ relative to CD8αα homodimers, conferring ~100-fold greater sensitivity to peptide antigen-induced IL-2 production; this enhancement is independent of both CD8α and CD8β cytoplasmic tails, as demonstrated by cytoplasmic deletion mutants.\",\n      \"method\": \"Transfection of CD8α alone or with CD8β cDNA into mouse T cell hybridoma N15wt; analysis of IL-2 production with cytoplasmic deletion mutants\",\n      \"journal\": \"Cellular immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — functional assay with cytoplasmic deletion mutants demonstrating ectodomain-dependent enhancement, single lab\",\n      \"pmids\": [\"9973530\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1988,\n      \"finding\": \"CD8β (Ly-3) requires CD8α (Ly-2) for cell surface expression; transfection of the Ly-3 gene alone does not result in detectable surface expression of Ly-3 antigenic determinants, whereas co-transfection with Ly-2 results in surface expression. Conversely, Ly-2 surface expression is not dependent on Ly-3.\",\n      \"method\": \"Gene transfection into mouse L cells, flow cytometry with monoclonal antibodies\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — independently replicated across multiple labs (PMID 3258885, 3145196, 2452747) using transfection assays with consistent findings\",\n      \"pmids\": [\"3258885\", \"3145196\", \"2452747\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"ART2.2 (ADP-ribosyl transferase 2.2) uses extracellular NAD+ to ADP-ribosylate CD8β on arginine residues of its extracellular domain on murine CD8+ T cells. This modification prevents binding of anti-CD8β mAb YTS156.7.7, interferes with MHC-I tetramer binding, and reduces CD8+ T-cell-mediated cytotoxicity in vivo.\",\n      \"method\": \"In vitro and in vivo NAD+ treatment of murine CD8+ T cells, ART2-deficient mice, inhibitory anti-ART2.2 single-domain antibodies, OVA:MHC-I tetramer binding assay, in vivo cytotoxicity assay\",\n      \"journal\": \"European journal of immunology\",\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"Tier 2 / Strong — multiple orthogonal methods including genetic knockout controls, specific inhibitory antibodies, and functional in vivo readout in a single rigorous study\",\n      \"pmids\": [\"23575529\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"Human CD8β splice variants (M-1, M-2, M-3, M-4) differ in expression patterns across T cell subsets: M-1 is predominant in naïve T cells, M-4 is predominant in effector memory T cells, and M-2 mRNA is elevated 10–20-fold upon T cell stimulation. The M-2 isoform is targeted to a lysosomal compartment via ubiquitination of lysine K215 in its cytoplasmic tail; upon short-term stimulation, M-2 localizes to the cell surface with the TCR complex.\",\n      \"method\": \"Quantitative RT-PCR in primary human T cells; fluorescent chimera localization by confocal microscopy in transfected cell lines; ubiquitination assay\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods (qRT-PCR, live imaging, ubiquitination assay) in a single lab\",\n      \"pmids\": [\"18490743\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2013,\n      \"finding\": \"The CD8β M-4 isoform contains a dihydrophobic leucine-based receptor internalization motif in its cytoplasmic tail that regulates cell surface expression and downregulation after activation. The M-4 cytoplasmic tail associates with ubiquitinated targets, is itself mono-ubiquitinated on a lysine residue, and contains an NPW motif (potential EH domain binding site) that modulates ubiquitinated target interaction. T cells expressing CD8αβ M-4 showed twofold higher frequency of MIP-1β secreting cells responding to antigen compared to M-1 expressing T cells.\",\n      \"method\": \"Mutagenesis of leucine-based motif and NPW motif, ubiquitination assays in 293T cells and human T cell line, functional cytokine secretion assay with primary peripheral blood T cells\",\n      \"journal\": \"PloS one\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — mutagenesis combined with functional and biochemical assays, single lab\",\n      \"pmids\": [\"23533620\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1981,\n      \"finding\": \"Lyt-2 (CD8α) and Lyt-3 (CD8β) antigens are carried on separate disulfide-bonded subunits of the same cell surface macromolecule, present as dimers, tetramers, and hexamers on thymocytes. Selective tryptic removal of Lyt-3 (CD8β) from cytotoxic effector cells does not abolish cytotoxic activity, but reduces blocking by anti-Lyt-3 while increasing blocking by anti-Lyt-2, suggesting CD8β modulates but is not essential for cytolytic activity.\",\n      \"method\": \"Monoclonal antibody precipitation, SDS-PAGE, 2D gel electrophoresis, protease treatment of effector cells, cytotoxicity blocking assay\",\n      \"journal\": \"The Journal of experimental medicine\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — biochemical characterization of subunit composition with functional blocking assay, foundational study with multiple methods\",\n      \"pmids\": [\"6166718\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1999,\n      \"finding\": \"During human intrathymic development, CD8β expression is acquired after CD8α and coincides with expression of cytoplasmic TCRβ chain (TCRβic) and surface CD3 and pre-TCRα. CD8β onset marks the transition associated with pre-TCR-mediated beta-selection, and CD8αβ heterodimers are selectively found on DP thymocytes that have undergone pre-TCR signaling.\",\n      \"method\": \"In vivo analysis of human thymocyte subsets; multicolor flow cytometry; correlation of CD8β with TCRβic and proliferative status\",\n      \"journal\": \"Blood\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 3 / Moderate — direct localization/expression analysis in primary human thymocytes with multiple cell surface and intracellular markers, single lab but comprehensive phenotyping\",\n      \"pmids\": [\"10552959\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2024,\n      \"finding\": \"IL-15 induces cell-cycle-dependent down-modulation of CD8β from the surface of human naïve CD8+ T cells, generating CD8αβlow and CD8αα T cells. This is associated with a decrease in mRNA of the CD8β M-4 isoform while M-1/M-2 isoform and CD8α mRNA levels increase. CD8+ T cell blasts generated by IL-15 show increased Lck levels, distinct from cells cultured with IL-2 or IL-7.\",\n      \"method\": \"CFSE labeling, flow cytometry, qPCR for CD8α and CD8β isoforms, intracellular Lck staining, cytokine comparison (IL-2, IL-7, IL-15)\",\n      \"journal\": \"Frontiers in immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — multiple orthogonal methods (flow cytometry, qPCR, intracellular staining) in primary human cells, single lab\",\n      \"pmids\": [\"38903513\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 2008,\n      \"finding\": \"In CD8β knockout mice, CD8+ T cells mount normal primary, secondary, and memory responses to acute LCMV infection because CD8-independent TCRs are preferentially selected in the absence of CD8β, effectively compensating for reduced coreceptor function of CD8αα. The TCR repertoire, particularly the TCRα chain, differs between CD8β KO and wild-type mice.\",\n      \"method\": \"CD8β knockout mice, tetramer staining, cytotoxicity assays, TCR repertoire analysis, LCMV infection model\",\n      \"journal\": \"International immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — genetic KO model with multiple functional readouts (tetramer, cytotoxicity, TCR repertoire) demonstrating compensatory selection mechanism, single lab\",\n      \"pmids\": [\"19088062\"],\n      \"is_preprint\": false\n    },\n    {\n      \"year\": 1998,\n      \"finding\": \"Cross-linking of macrophage CD8β (in addition to CD8α) stimulates nitric oxide production and upregulation of inducible NO synthase. This signaling through CD8β is inhibited by broad-spectrum protein tyrosine kinase inhibitors (genistein), src-family kinase inhibitor (PP1), and PKC inhibitors, indicating involvement of src-family tyrosine kinases and PKC downstream of CD8β.\",\n      \"method\": \"Antibody cross-linking of rat macrophage CD8β, NO production assay, iNOS Western blot, pharmacological inhibitors of kinase pathways\",\n      \"journal\": \"Journal of immunology\",\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"Tier 2 / Moderate — direct biochemical signaling assay with multiple pharmacological inhibitors establishing pathway components, single lab\",\n      \"pmids\": [\"9637515\"],\n      \"is_preprint\": false\n    }\n  ],\n  \"current_model\": \"CD8β (CD8B) functions as the β subunit of the CD8αβ coreceptor on cytotoxic T cells: its extracellular Ig-like domain directly enhances avidity of CD8 binding to MHC class I (including independently binding MHC I/β2m dimers), its cytoplasmic tail undergoes palmitoylation that drives partitioning into lipid rafts and constitutive association with p56(lck) and TCR/CD3, thereby coupling the TCR complex to lck-mediated signaling; O-glycan sialylation of the CD8β stalk region by ST3Gal-1 provides a developmental switch modulating MHC I binding during thymic maturation; CD8β surface expression strictly requires co-expression of CD8α; human CD8B encodes four alternatively spliced isoforms (M-1 to M-4) with distinct cytoplasmic tails that differ in subcellular trafficking, ubiquitination, and functional coupling in naïve versus effector memory T cells; and CD8β is subject to ADP-ribosylation by ART2.2, which impairs MHC-I tetramer binding and in vivo cytotoxicity.\"\n}\n```","stage2_raw":"{\n  \"mechanistic_narrative\": \"CD8B encodes the β subunit of the CD8αβ coreceptor that endows cytotoxic T cells with sensitive recognition of peptide–MHC class I antigen [#4]. Its extracellular Ig-like domain directly engages MHC class I/β2-microglobulin and raises the avidity of CD8 binding, while also coupling efficiently to the TCR/CD3 complex; both ectodomain and cytoplasmic functions contribute to CD8+ T cell development in vivo [#1, #3, #4]. The cytoplasmic tail of CD8β is palmitoylated, which partitions the coreceptor into lipid rafts where it associates constitutively with p56(lck) and with TCR/CD3, so that MHC-peptide engagement activates raft-localized Lck to phosphorylate CD3 and initiate signaling [#0, #1]. Surface display of CD8β is strictly dependent on co-expression of CD8α, with which it forms disulfide-bonded heterodimers and higher-order oligomers [#5, #9]. CD8β function is further tuned by post-translational and developmental controls: ST3Gal-1–mediated sialylation of stalk O-glycans acts as a thymic maturation switch modulating MHC I binding avidity [#2], ART2.2-catalyzed ADP-ribosylation of extracellular arginines impairs MHC-I tetramer binding and in vivo cytotoxicity [#6], and CD8β onset during human thymopoiesis coincides with pre-TCR signaling and β-selection [#10]. Human CD8B produces alternatively spliced isoforms with distinct cytoplasmic tails (M-1 to M-4) that differ in T cell subset distribution, ubiquitination-driven trafficking, internalization, and functional output [#7, #8].\",\n  \"teleology\": [\n    {\n      \"year\": 1981,\n      \"claim\": \"Established that CD8 is a multi-subunit cell surface molecule in which CD8β (Lyt-3) is a distinct disulfide-bonded chain that modulates, but is not strictly required for, cytolytic activity.\",\n      \"evidence\": \"mAb precipitation, 2D gel electrophoresis, protease stripping, and cytotoxicity blocking on murine effector cells\",\n      \"pmids\": [\"6166718\"],\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\"Did not define the molecular basis of CD8β's contribution to MHC binding or signaling\", \"Subunit stoichiometry of dimers/tetramers/hexamers not functionally dissected\"]\n    },\n    {\n      \"year\": 1988,\n      \"claim\": \"Answered why CD8β does not appear alone by showing its surface expression requires CD8α, defining an obligate assembly dependency.\",\n      \"evidence\": \"Transfection of Ly-3 alone versus Ly-2/Ly-3 co-transfection into mouse L cells with flow cytometry\",\n      \"pmids\": [\"3258885\", \"3145196\", \"2452747\"],\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\"Trafficking/folding step at which CD8α is required was not identified\", \"Did not address functional role of the heterodimer\"]\n    },\n    {\n      \"year\": 1998,\n      \"claim\": \"Distinguished the ectodomain contribution of CD8β, showing it independently binds MHC I/β2m and uniquely couples to TCR/CD3.\",\n      \"evidence\": \"Chimeric CD8β/α molecules and binding assays with T hybridoma alloantigen responses\",\n      \"pmids\": [\"9574520\"],\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\"Affinities and binding geometry not quantified\", \"Single-lab functional readout without structural data\"]\n    },\n    {\n      \"year\": 1999,\n      \"claim\": \"Quantified the coreceptor advantage of CD8αβ over CD8αα, showing the CD8β ectodomain confers ~100-fold greater antigen sensitivity independent of cytoplasmic tails.\",\n      \"evidence\": \"Transfection of CD8α with/without CD8β and cytoplasmic deletion mutants in N15wt hybridoma, IL-2 readout\",\n      \"pmids\": [\"9973530\"],\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\"Mechanism by which ectodomain enhances avidity not resolved at molecular level\", \"Single cell-line system\"]\n    },\n    {\n      \"year\": 1999,\n      \"claim\": \"Placed CD8β acquisition in developmental context, showing its onset coincides with pre-TCR signaling and β-selection during human thymopoiesis.\",\n      \"evidence\": \"Multicolor flow cytometry of primary human thymocyte subsets correlated with intracellular TCRβ and pre-TCRα\",\n      \"pmids\": [\"10552959\"],\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\"Correlative; causal link between CD8β onset and β-selection not tested\", \"Transcriptional regulators of timing not identified\"]\n    },\n    {\n      \"year\": 2000,\n      \"claim\": \"Dissected in vivo the division of labor between CD8β domains, showing the ectodomain raises MHC I avidity while the cytoplasmic tail enhances Lck and LAT association, with both contributing to CD8+ T cell development.\",\n      \"evidence\": \"Reconstitution of CD8β-deficient mice with chimeric transgenes, avidity assays, co-IP for Lck/LAT\",\n      \"pmids\": [\"10795739\"],\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\"Did not resolve the biochemical step linking cytoplasmic tail to Lck/LAT recruitment\", \"Relative quantitative contributions in mature effector function not separated\"]\n    },\n    {\n      \"year\": 2001,\n      \"claim\": \"Defined the signaling mechanism: palmitoylation of the CD8β cytoplasmic tail drives raft partitioning, constitutive p56(lck) and TCR/CD3 association, and Lck activation upon MHC-peptide engagement.\",\n      \"evidence\": \"TCR photoaffinity labeling, CD8β cytoplasmic mutants in T1.4 hybridomas, raft fractionation, co-IP\",\n      \"pmids\": [\"11714755\"],\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\"Palmitoyl-transferase responsible not identified\", \"Dynamics of raft entry/exit during signaling not measured\"]\n    },\n    {\n      \"year\": 2002,\n      \"claim\": \"Identified a glycan-based developmental switch: ST3Gal-1 sialylation of CD8β stalk O-glycans during thymic maturation alters MHC I binding avidity.\",\n      \"evidence\": \"ES-MS and MS/MS of CD8β glycopeptides from immature versus mature thymocytes\",\n      \"pmids\": [\"12459555\"],\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\"Functional consequence on selection thresholds not directly tested\", \"Whether sialylation is reversed in peripheral effector cells unknown\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Revealed isoform diversity, showing human CD8β splice variants are differentially distributed across T cell subsets, with M-2 trafficked to a lysosomal compartment via cytoplasmic ubiquitination at K215.\",\n      \"evidence\": \"qRT-PCR in primary human T cells, confocal localization of chimeras, ubiquitination assay\",\n      \"pmids\": [\"18490743\"],\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\"Functional impact of isoform-specific trafficking on signaling not established\", \"Ubiquitin ligase not identified\"]\n    },\n    {\n      \"year\": 2008,\n      \"claim\": \"Showed CD8β is not strictly essential, as CD8β-knockout mice mount normal antiviral responses by preferentially selecting CD8-independent TCRs.\",\n      \"evidence\": \"CD8β KO mice, tetramer staining, cytotoxicity, TCR repertoire analysis in LCMV infection\",\n      \"pmids\": [\"19088062\"],\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\"Compensatory repertoire shift mechanism not molecularly defined\", \"May not generalize to CD8-dependent or chronic antigens\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Defined isoform-specific trafficking control and effector tuning, showing the M-4 cytoplasmic tail uses a leucine-based internalization motif and mono-ubiquitination to regulate surface expression and enhance antigen-induced cytokine secretion.\",\n      \"evidence\": \"Mutagenesis of leucine and NPW motifs, ubiquitination assays in 293T and human T cells, MIP-1β secretion assay\",\n      \"pmids\": [\"23533620\"],\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\"EH-domain partner of the NPW motif not identified\", \"Mechanistic link from trafficking to enhanced cytokine output unresolved\"]\n    },\n    {\n      \"year\": 2013,\n      \"claim\": \"Identified ADP-ribosylation as a post-translational off-switch, showing ART2.2 modifies extracellular arginines of CD8β to impair MHC-I tetramer binding and in vivo cytotoxicity.\",\n      \"evidence\": \"NAD+ treatment of murine CD8+ T cells, ART2-deficient mice, inhibitory anti-ART2.2 nanobodies, tetramer binding and in vivo cytotoxicity assays\",\n      \"pmids\": [\"23575529\"],\n      \"confidence\": \"High\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\"Specific modified arginine residues not mapped\", \"Physiological contexts of extracellular NAD+ exposure not defined\"]\n    },\n    {\n      \"year\": 2024,\n      \"claim\": \"Linked cytokine environment to coreceptor remodeling, showing IL-15 drives cell-cycle-dependent CD8β down-modulation and isoform mRNA shifts, generating CD8αβlow/CD8αα cells with elevated Lck.\",\n      \"evidence\": \"CFSE labeling, flow cytometry, qPCR for CD8α/CD8β isoforms, intracellular Lck staining across IL-2/IL-7/IL-15\",\n      \"pmids\": [\"38903513\"],\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\"Functional consequence of IL-15-driven CD8β loss on T cell function not established\", \"Signaling pathway from IL-15 to isoform switch unknown\"]\n    },\n    {\n      \"year\": null,\n      \"claim\": \"How the multiple post-translational and isoform-level controls on CD8β (palmitoylation, sialylation, ADP-ribosylation, ubiquitination, splicing) are integrated to set coreceptor avidity and signaling thresholds across development and effector states remains unresolved.\",\n      \"evidence\": \"\",\n      \"pmids\": [],\n      \"confidence\": \"Medium\",\n      \"confidence_rationale\": \"\",\n      \"gaps\": [\"No structural model integrating glycan/ADP-ribosylation effects on MHC binding\", \"Enzymes for palmitoylation and isoform ubiquitination unidentified\", \"Interplay between cytokine-driven down-modulation and antigen sensitivity untested\"]\n    }\n  ],\n  \"mechanism_profile\": {\n    \"molecular_activity\": [\n      {\"term_id\": \"GO:0060089\", \"supporting_discovery_ids\": [0, 1, 4]},\n      {\"term_id\": \"GO:0098631\", \"supporting_discovery_ids\": [1, 3]}\n    ],\n    \"localization\": [\n      {\"term_id\": \"GO:0005886\", \"supporting_discovery_ids\": [0, 5, 7]},\n      {\"term_id\": \"GO:0005764\", \"supporting_discovery_ids\": [7]}\n    ],\n    \"pathway\": [\n      {\"term_id\": \"R-HSA-168256\", \"supporting_discovery_ids\": [0, 1, 6]},\n      {\"term_id\": \"R-HSA-162582\", \"supporting_discovery_ids\": [0, 13]},\n      {\"term_id\": \"R-HSA-1266738\", \"supporting_discovery_ids\": [1, 10]}\n    ],\n    \"complexes\": [\"CD8αβ coreceptor\", \"TCR/CD3 complex\"],\n    \"partners\": [\"CD8A\", \"LCK\", \"LAT\", \"ST3GAL1\", \"ART2.2\"],\n    \"other_free_text\": []\n  }\n}","audit_flag":null,"evaluation":{"pairwise":"win","faith_supported":6,"faith_total":6,"faith_pct":100.0}}