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. Note: This description may include information from UniProtKB.
Protein type: Membrane protein, integral; Receptor protein phosphatase, tyrosine; Motility/polarity/chemotaxis; EC 18.104.22.168
Chromosomal Location of Human Ortholog: 1q31-q32
Cellular Component: focal adhesion; membrane; integral to plasma membrane; plasma membrane; lipid raft; external side of plasma membrane
Molecular Function: protein binding; transmembrane receptor protein tyrosine phosphatase activity; protein tyrosine phosphatase activity; protein kinase binding
Biological Process: B cell proliferation; axon guidance; substrate-bound cell migration, cell release from substrate; regulation of cell cycle; protein amino acid dephosphorylation; positive regulation of antigen receptor-mediated signaling pathway; T cell receptor signaling pathway; bone marrow development; stem cell development; B cell receptor signaling pathway; cell surface receptor linked signal transduction; dephosphorylation; positive regulation of protein kinase activity; release of sequestered calcium ion into cytosol; negative regulation of T cell mediated cytotoxicity; positive regulation of B cell proliferation; negative regulation of protein kinase activity; negative regulation of cytokine and chemokine mediated signaling pathway; positive regulation of T cell proliferation; hemopoietic progenitor cell differentiation; immunoglobulin biosynthetic process; defense response to virus; T cell differentiation
SS: The number of records in which this modification site was determined using site-specific methods. SS methods include amino acid sequencing, site-directed mutagenesis, modification site-specific antibodies, specific MS strategies, etc.