In enzymology, a 1-phosphatidylinositol-3-phosphate 5-kinase (EC 22.214.171.124) is an enzyme that catalyzes the chemical reaction
- ATP + 1-phosphatidyl-1D-myo-inositol 3-phosphate ⇌ ADP + 1-phosphatidyl-1D-myo-inositol 3,5-bisphosphate
Thus, the two substrates of this enzyme are ATP and 1-phosphatidyl-1D-myo-inositol 3-phosphate, whereas its two products are ADP and 1-phosphatidyl-1D-myo-inositol 3,5-bisphosphate.
This enzyme belongs to the family of transferases, specifically those transferring phosphorus-containing groups (phosphotransferases) with an alcohol group as acceptor. The systematic name of this enzyme class is ATP:1-phosphatidyl-1D-myo-inositol-3-phosphate 5-phosphotransferase. Other names in common use include type III PIP kinase, and phosphatidylinositol 3-phosphate 5-kinase. This enzyme participates in phosphatidylinositol signaling system and regulation of actin cytoskeleton.
- RH, Parker PJ; Dove, SK; McEwen, RK; Painter, G; Holmes, AB; Hall, MN; Michell, RH; Parker, PJ (1998). "The stress-activated phosphatidylinositol 3-phosphate 5-kinase Fab1p is essential for vacuole function in S. cerevisiae". Curr. Biol. 8 (22): 1219–1222. doi:10.1016/S0960-9822(07)00513-1. PMID 9811604.