Seems to act on Cbl. May play a role in regulating the function of Cbl and its associated protein kinases. Acts as negative regulator of T-cell receptor (TCR) signaling. Dephosphorylates and inactivates the SRC family kinases. Interacts with CSK. Interacts with LPXN. Predominantly expressed in lymphoid tissues and cells. Isoform 1 is expressed in thymocytes and both mature B and T-cells. Down-regulated by phosphorylation. Belongs to the protein-tyrosine phosphatase family. Non-receptor class 4 subfamily. 5 isoforms of the human protein are produced by alternative splicing. Note: This description may include information from UniProtKB.
Protein type: EC 188.8.131.52; Motility/polarity/chemotaxis; Protein phosphatase, tyrosine (non-receptor)
Cellular Component: internal side of plasma membrane; perinuclear region of cytoplasm; cytoplasm; nucleus
Molecular Function: protein binding; protein tyrosine phosphatase activity; kinase binding; SH3 domain binding
Biological Process: regulation of B cell receptor signaling pathway; regulation of natural killer cell proliferation; negative regulation of T cell receptor signaling pathway; protein amino acid dephosphorylation; negative regulation of T cell activation; T cell receptor signaling pathway; regulation of innate immune response; 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.