title: Cloning of TRAP, a ligand for CD40 on human T cells.
abstract: A cDNA clone, designated TRAP (TNF-related activation protein) was isolated from a collection of T cell activation genes. The polypeptide encoded by a mRNA of approx. 2.3 kb is 261 amino acids long with a calculated M(r) of 29.3 kDa. The structural features predict a type II transmembrane protein, but are also compatible with a secreted form. TRAP is highly similar to an identified murine CD40 ligand both at the cDNA (82.8% identity) and the protein (77.4% identity) levels, and related to tumor necrosis factor/lymphotoxin. Expressed in a murine myeloma, TRAP was identified as a ligand for CD40 by binding to a soluble CD40 construct. TRAP mRNA is expressed in a T cell-specific fashion with a maximum at 8 h after stimulation. The TRAP gene is located in the q26.3-q27.1 region of the X chromosome.
mesh_terms: D000595:Amino Acid Sequence; D015703:Antigens, CD / Q000378:metabolism*; D000944:Antigens, Differentiation, B-Lymphocyte / Q000378:metabolism*; D001483:Base Sequence; D019013:CD40 Antigens; D023201:CD40 Ligand; D002874:Chromosome Mapping; D003001:Cloning, Molecular; D006801:Humans; D008024:Ligands; D008562:Membrane Glycoproteins / Q000235:genetics*; D008969:Molecular Sequence Data; D012333:RNA, Messenger / Q000032:analysis; D014162:Transfection; D014409:Tumor Necrosis Factor-alpha / Q000235:genetics*
chemical_list: D015703:Antigens, CD; D000944:Antigens, Differentiation, B-Lymphocyte; D019013:CD40 Antigens; D008024:Ligands; D008562:Membrane Glycoproteins; D012333:RNA, Messenger; D014409:Tumor Necrosis Factor-alpha; D023201:CD40 Ligand