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protein tyrosine phosphatase-like domain of myotubularin phosphoinositide phosphatase 1 Myotubularin phosphoinositide phosphatase 1 (MTM1), also called myotubularin, is enzymatically active and contains an N-terminal PH-GRAM domain and C-terminal coiled-coiled domain and PDZ binding site. Mutations in MTM1 cause X-linked myotubular myopathy. In general, myotubularins are a unique subgroup of protein tyrosine phosphatases that use inositol phospholipids, rather than phosphoproteins, as substrates. They dephosphorylate the D-3 position of phosphatidylinositol 3-phosphate [PI(3)P] and phosphatidylinositol 3,5-bisphosphate [PI(3,5)P2], generating phosphatidylinositol and phosphatidylinositol 5-phosphate [PI(5)P], respectively. |
Jiyao W et al.(2023). "The conserved domain database in 2023.",