This gene encodes a membrane glycoprotein that is a member of the signaling lymphocyte activation molecule (SLAM) family. This family forms a subset of the larger CD2 cell-surface receptor Ig superfamily. The encoded protein is a homophilic adhesion molecule that is expressed in numerous immune cells types and is involved in regulating receptor-mediated signaling in those cells. Alternate splicing results in multiple transcript variants. [provided by RefSeq, Oct 2011]
Function:
Plays a role as adhesion receptor functioning by homophilic interactions and by clustering. Recruits SH2 domain-containing proteins SH2D1A/SAP. Increases proliferative responses of activated T-cells and SH2D1A/SAP does not seen be required for this process. Homophilic interactions enhance interferon gamma/IFNG secretion in lymphocytes and induce platelet stimulation via a SH2D1A/SAP-dependent pathway. May serve as a marker for hematopoietic progenitor cells.
Subunit:
Homodimer; via its extracellular domain. Forms a head to tail dimer with a CD48 molecule from another cell. Interacts with SH2 domain-containing proteins SH2D1A/SAP and SH2D1B/hEAT-2. Interacts with tyrosine-protein phosphatases PTPN6 and PTPN11 via its phosphorylated cytoplasmic domain, and this interaction is blocked by SH2D1A.
Subcellular Location:
Cell membrane; Single-pass type I membrane protein.
Tissue Specificity:
Predominantly expressed in hematopoietic tissues such as lymph node, spleen, thymus, and bone marrow. Detected also in lung.
Post-translational modifications:
Phosphorylated by tyrosine-protein kinase LCK on tyrosine residues following ligation induced by agonist monoclonal antibody. The association with SH2D1A/SAP is dependent of tyrosines phosphorylation of its cytoplasmic domain Phosphorylated on Tyr-280 and Tyr-300 following platelet aggregation.
N-glycosylated (By similarity).
Similarity:
Contains 1 Ig-like C2-type (immunoglobulin-like)
SWISS:
Q9UIB8
Gene ID:
8832
Database links:
Entrez Gene: 8832 Human
Omim: 604513 Human
SwissProt: Q9UIB8 Human
Unigene: 79693 Human
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