At the early endosome membrane, myotubularin (MTM1), myotubularin-related protein 2 (MTMR2) and myotubularin-related protein 4 (MTMR4) 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), MTMR2 (Cao et al. 2008), and MTMR4 (Lorenzo et al. 2006).