CD45 Antibody – Mouse Monoclonal

The protein encoded by this gene is a member of the protein tyrosine phosphatase (PTP) family. PTPs are known to be signaling molecules that regulate a variety of cellular processes including cell growth, differentiation, mitosis, and oncogenic transformation. This PTP contains an extracellular domain, a single transmembrane segment and two tandem intracytoplasmic catalytic domains, and thus is classified as a receptor type PTP. This PTP has been shown to be an essential regulator of T- and B-cell antigen receptor signaling. It functions through either direct interaction with components of the antigen receptor complexes, or by activating various Src family kinases required for the antigen receptor signaling. This PTP also suppresses JAK kinases, and thus functions as a regulator of cytokine receptor signaling. Alternatively spliced transcripts variants of this gene, which encode distinct isoforms, have been reported. [provided by RefSeq, Jun 2012]

CD45: a receptor type protein tyrosine phosphatase protein. Contains an extracellular domain, a single transmembrane segment and two tandem intracytoplasmic catalytic domains. The first PTPAse domain has enzymatic activity, while the second one seems to affect the substrate specificity of the first one. Specifically expressed in hematopoietic cells. An essential regulator of T- and B-cell antigen receptor signaling. Functions through either direct interaction with components of the antigen receptor complexes, or by activating various Src family kinases required for the antigen receptor signaling. Suppresses JAK kinases, and thus functions as a regulator of cytokine receptor signaling. Four alternatively spliced isoforms have been described.

Protein type: EC 3.1.3.48; Membrane protein, integral; Motility/polarity/chemotaxis; Receptor protein phosphatase, tyrosine

Chromosomal Location of Human Ortholog: 1q31.3-q32.1

Cellular Component: cell surface; external side of plasma membrane; focal adhesion; integral to plasma membrane; membrane; plasma membrane; secretory granule membrane

Molecular Function: protein binding; protein kinase binding; protein tyrosine phosphatase activity; transmembrane receptor protein tyrosine phosphatase activity

Biological Process: B cell proliferation; B cell receptor signaling pathway; bone marrow development; cell surface receptor linked signal transduction; defense response to virus; dephosphorylation; hemopoietic progenitor cell differentiation; immunoglobulin biosynthetic process; negative regulation of cytokine and chemokine mediated signaling pathway; negative regulation of protein kinase activity; negative regulation of T cell mediated cytotoxicity; neutrophil degranulation; positive regulation of antigen receptor-mediated signaling pathway; positive regulation of B cell proliferation; positive regulation of T cell proliferation; protein amino acid dephosphorylation; regulation of cell cycle; release of sequestered calcium ion into cytosol; stem cell development; substrate-bound cell migration, cell release from substrate; T cell differentiation; T cell receptor signaling pathway

Disease: Hepatitis C Virus, Susceptibility To; Severe Combined Immunodeficiency, Autosomal Recessive, T Cell-negative, B Cell-positive, Nk Cell-positive