MTMR7 binds to MTMR9, an enzymatically inactive myotubularin family member, which results in increased enzymatic activity of MTMR7. Almost all MTMR7 in the cell is present in the complex with MTMR9 (Mochizuki and Majerus 2003).
Formation of a complex with MTMR9 results in 2- to 5-fold increase in MTMR7 inositol-1,3-bisphosphate 3-phosphatase catalytic activity (Mochizuki and Majerus 2003).
At the late endosome membrane, myotubularin (MTM1), myotubularin-related protein 2 (MTMR2), myotubularin-related protein 4 (MTMR4), and myotubularin-related protein 7 (MTMR7) dephosphorylate phosphatidylinositol 3,5-bisphosphate (PI(3,5)P2) to phosphatidylinositol 5-phosphate (PI5P).
The following lists the above proteins with their corresponding literature references: MTM1 (Cao et al. 2007, Cao et al. 2008, Tsujita et al. 2004, Tronchere et al. 2004), MTMR2 (Cao et al. 2008), MTMR4 (Lorenzo et al. 2006), and MTMR7 (Mochizuki & Majerus 2003, Lorenzo et al. 2006).
At the late endosome membrane, myotubularin (MTM1), myotubularin-related protein 2 (MTMR2), myotubularin-related protein 4 (MTMR4), and myotubularin-related protein 7 (MTMR7) dephosphorylate phosphatidylinositol 3-phosphate (PI3P) to phosphatidylinositol (PI).
The following lists the above proteins with their corresponding literature references: MTM1 (Cao et al. 2007, Cao et al. 2008, Tsujita et al. 2004, Tronchere et al. 2004, Kim et al. 2002); MTMR2 (Cao et al. 2008, Kim et al. 2002); MTMR4 (Lorenzo et al. 2006); and MTMR7 (Mochizuki & Majerus 2003, Lorenzo et al. 2006).