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CD48
CD48 antigen (Cluster of Differentiation 48) also known as B-lymphocyte activation marker (BLAST-1) or signaling lymphocytic activation molecule 2 (SLAMF2) is a protein that in humans is encoded by the CD48 gene.〔(【引用サイトリンク】 url = http://www.ncbi.nlm.nih.gov/sites/entrez?Db=gene&Cmd=ShowDetailView&TermToSearch=962 )〕
CD48 is a member of the CD2 subfamily of the immunoglobulin superfamily (IgSF) which includes SLAM (signaling lymphocyte activation molecules) proteins, such as CD84, CD150, CD229 and CD244. CD48 is found on the surface of lymphocytes and other immune cells, dendritic cells and endothelial cells, and participates in activation and differentiation pathways in these cells.〔
CD48 was the first B-cell-specific cellular differentiation antigen identified in transformed B lymphoblasts.
==Structure==
The gene for CD48 is located in chromosome 1q23 and contains 4 exons, each exon encoding one of the 4 domains of CD48: signal peptide, variable (V) domain, constant 2 (C2) domain and the glycophosphatidylinositol anchor (GPI anchor). The cDNA sequence of 1137 nucleotides encodes a 243 amino acid polypeptide of about 45 kDa.〔 It consists of a 26 amino acid signal peptide, 194 amino acids of mature CD48 (V and C2 domains) and the C-terminal 23 amino acid segment comprising the GPI anchor. The GPI linkage of CD48 to the cell surface is through serine residue 220.〔〔 CD48 does not have a transmembrane domain, however, but is held at the cell surface by a GPI anchor via a C-terminal domain which can be cleaved to yield a soluble form of the receptor.〔 The CD48 protein is heavily glycosylated, with five possible asparagine-linked glycosylation sites at positions 40, 44, 104, 162 and 189, respectively.〔〔 Approximately 35-40% of the total molecular weight is attributed to the carbohydrate side chains.〔〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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