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The Sema domain, a protein interacting module, of MET (also called hepatocyte growth factor receptor, HGFR) MET is encoded by the c-met protooncogene. MET is a receptor tyrosine kinase that binds its ligand, hepatocyte growth factor/scatter factor (HGF/SF). HGF/SF and MET are essential for the development of several tissues and organs, including the placenta, liver, and several groups of skeletal muscles. It also plays a major role in the abnormal migration of cancer cells as a result of overexpression or MET mutations. MET is composed of an alpha-beta heterodimer. The extracellular alpha chain is disulfide linked to the beta chain, which contains an extracellular ligand-binding region with a Sema domain, a PSI domain and four IPT repeats, a transmembrane segment, and an intracellular catalytic tyrosine kinase domain. The cytoplasmic C-terminal region acts as a docking site for multiple protein substrates, including Grb2, Gab1, STAT3, Shc, SHIP-1 and Src. The Sema domain is located at the N-terminus and contains four disulfide bonds formed by eight conserved cysteine residues. The Sema domain of Met is necessary for receptor dimerization and activation. |
Jiyao W et al.(2023). "The conserved domain database in 2023.",