| 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. |
| Protein Name | T-Cell Surface Glycoprotein Cd8 Alpha ChainT-Cell Surface Glycoprotein Lyt-2Cd Antigen Cd8a |
| Database Links | Reactome: R-MMU-198933 |
| Cellular Localisation | Cell MembraneSingle-Pass Type I Membrane ProteinCd8a Localizes To Lipid Rafts Only When Associated With Its Partner Cd8b |
| Alternative Protein Names | T-Cell Surface Glycoprotein Cd8 Alpha Chain proteinT-Cell Surface Glycoprotein Lyt-2 proteinCd Antigen Cd8a proteinCd8a proteinLyt-2 proteinLyt2 protein |
Information sourced from Uniprot.org
