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. LCK then initiates different intracellular signaling pathways by phosphorylating various substrates ultimately leading to lymphokine production, motility, adhesion and activation of cytotoxic T-lymphocytes (CTLs). This mechanism enables CTLs to recognize and eliminate infected cells and tumor cells. In NK-cells, the presence of CD8A homodimers at the cell surface provides a survival mechanism allowing conjugation and lysis of multiple target cells. CD8A homodimer molecules also promote the survival and differentiation of activated lymphocytes into memory CD8 T-cells. {ECO:0000269|PubMed:16236125, ECO:0000269|PubMed:17678538, ECO:0000269|PubMed:23657257, ECO:0000269|PubMed:26082771}.
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GO - Biological processes (BP):
adaptive immune response [GO:0002250]; antigen processing and presentation [GO:0019882]; cell surface receptor signaling pathway [GO:0007166]; cytotoxic T cell differentiation [GO:0045065]; immune response [GO:0006955]; T cell activation [GO:0042110]; T cell mediated immunity [GO:0002456]; T cell re...
adaptive immune response [GO:0002250]; antigen processing and presentation [GO:0019882]; cell surface receptor signaling pathway [GO:0007166]; cytotoxic T cell differentiation [GO:0045065]; immune response [GO:0006955]; T cell activation [GO:0042110]; T cell mediated immunity [GO:0002456]; T cell receptor signaling pathway [GO:0050852]; transmembrane receptor protein tyrosine kinase signaling pathway [GO:0007169]
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GO - Molecular function (MF):
coreceptor activity [GO:0015026]; MHC class I protein binding [GO:0042288]; MHC class I protein complex binding [GO:0023024]; protein kinase binding [GO:0019901]...
coreceptor activity [GO:0015026]; MHC class I protein binding [GO:0042288]; MHC class I protein complex binding [GO:0023024]; protein kinase binding [GO:0019901]
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GO - Cellular component (CC):
external side of plasma membrane [GO:0009897]; extracellular region [GO:0005576]; integral component of plasma membrane [GO:0005887]; plasma membrane [GO:0005886]; plasma membrane raft [GO:0044853]; receptor complex [GO:0043235]; T cell receptor complex [GO:0042101]...
external side of plasma membrane [GO:0009897]; extracellular region [GO:0005576]; integral component of plasma membrane [GO:0005887]; plasma membrane [GO:0005886]; plasma membrane raft [GO:0044853]; receptor complex [GO:0043235]; T cell receptor complex [GO:0042101]
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