Axl, Active (TNK2) Active Protein

This gene encodes a tyrosine kinase that binds Cdc42Hs in its GTP-bound form and inhibits both the intrinsic and GTPase-activating protein (GAP)-stimulated GTPase activity of Cdc42Hs. This binding is mediated by a unique sequence of 47 amino acids C-terminal to an SH3 domain. The protein may be involved in a regulatory mechanism that sustains the GTP-bound active form of Cdc42Hs and which is directly linked to a tyrosine phosphorylation signal transduction pathway. Several alternatively spliced transcript variants have been identified from this gene, but the full-length nature of only two transcript variants has been determined. [provided by RefSeq, Jul 2008]

Ack: a tyrosine kinase that binds Cdc42 in its GTP-bound form and inhibits both the intrinsic and GTPase-activating protein (GAP)-stimulated GTPase activity of Cdc42. This binding is mediated by a unique sequence of 47 amino acids C-terminal to an SH3 domain. May be involved in a regulatory mechanism that sustains the GTP-bound active form of Cdc42 and which is directly linked to a tyrosine phosphorylation signal transduction pathway. Amplification in primary tumors correlates with metastatic potential . Two differentially spliced isoforms have been described.

Protein type: Kinase, protein; Protein kinase, TK; Protein kinase, tyrosine (non-receptor); EC 2.7.11.1; EC 2.7.10.2; TK group; Ack family

Chromosomal Location of Human Ortholog: 3q29

Cellular Component: cytoplasmic vesicle membrane; clathrin-coated vesicle; dendrite; coated pit; extrinsic to internal side of plasma membrane; adherens junction; growth cone; cell soma; membrane; axon; cytoplasm; plasma membrane; nucleus; endosome

Molecular Function: protein serine/threonine kinase activity; protein binding; protein-tyrosine kinase activity; metal ion binding; WW domain binding; non-membrane spanning protein tyrosine kinase activity; protein serine/threonine/tyrosine kinase activity; ATP binding; GTPase inhibitor activity; hormone receptor binding; epidermal growth factor receptor binding

Biological Process: positive regulation of peptidyl-tyrosine phosphorylation; cell migration; cell surface receptor linked signal transduction; small GTPase mediated signal transduction; negative regulation of catalytic activity; innate immune response; endocytosis; cell differentiation; phosphorylation; transmembrane receptor protein tyrosine kinase signaling pathway; regulation of cell proliferation