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 cla...
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. {ECO:0000250|UniProtKB:P10300, ECO:0000269|PubMed:10925291, ECO:0000269|PubMed:11714755, ECO:0000269|PubMed:17145893}.
View more >>
GO - Biological processes (BP):
adaptive immune response [GO:0002250]; immune response [GO:0006955]; T cell activation [GO:0042110]; T cell receptor signaling pathway [GO:0050852]; transmembrane receptor protein tyrosine kinase signaling pathway [GO:0007169]...
adaptive immune response [GO:0002250]; immune response [GO:0006955]; T cell activation [GO:0042110]; T cell receptor signaling pathway [GO:0050852]; transmembrane receptor protein tyrosine kinase signaling pathway [GO:0007169]
View more >>
GO - Molecular function (MF):
coreceptor activity [GO:0015026]; MHC class I protein binding [GO:0042288]...
coreceptor activity [GO:0015026]; MHC class I protein binding [GO:0042288]
View more >>
GO - Cellular component (CC):
cell surface [GO:0009986]; early endosome membrane [GO:0031901]; extracellular region [GO:0005576]; integral component of plasma membrane [GO:0005887]; plasma membrane [GO:0005886]; T cell receptor complex [GO:0042101]...
cell surface [GO:0009986]; early endosome membrane [GO:0031901]; extracellular region [GO:0005576]; integral component of plasma membrane [GO:0005887]; plasma membrane [GO:0005886]; T cell receptor complex [GO:0042101]
View more >>