Myotubularin-related protein 7 (MTMR7)

Myotubularin-related protein 7 (MTMR7) is a 75–76 kDa dual-specificity lipid phosphatase primarily expressed in brain, liver, kidney, and testis. It dephosphorylates phosphatidylinositol 3-phosphate and inositol 1,3-bisphosphate, influencing intracellular signaling cascades crucial for cell growth, proliferation, and metabolism. MTMR7 interacts with proteins such as MTMR9 and PPARγ, modulating their activity in processes like insulin signaling and cellular differentiation. Its expression is reduced in colorectal cancer, making it a candidate biomarker and therapeutic target for metabolic and oncologic diseases. Key domain features: MTMR7 contains a plextrin homology (PH) domain, protein tyrosine phosphatase (PTP) region, SET-interaction (SID) domain, and a coiled-coil (CC) domain that mediates protein-protein interactions. Note: No direct approved drugs targeting MTMR7 are listed in current databases, but several studies propose its role as a novel drug target in cancer and metabolic disease contexts.

Other names

MTMR7Phosphatidylinositol-3-phosphate phosphatase MTMR7

MTMR7 functions through the inhibition of insulin-mediated AKT-ERK1/2 signaling by lowering phosphoinositide levels. It also activates PPARγ via complex formation and inhibition of ERK1/2-dependent phosphorylation. Its primary enzymatic action involves dephosphorylation at the D-3 position of lipid and soluble substrates.