1-phosphatidylinositol-4-phosphate 5-kinase

In enzymology, 1-phosphatidylinositol-4-phosphate 5-kinase is an enzyme that catalyzes the chemical reaction


 * ATP + 1-phosphatidyl-1D-myo-inositol 4-phosphate $$\rightleftharpoons$$ ADP + 1-phosphatidyl-1D-myo-inositol 4,5-bisphosphate

Thus, the two substrates of this enzyme are ATP and 1-phosphatidyl-1D-myo-inositol 4-phosphate, whereas its two products are ADP and 1-phosphatidyl-1D-myo-inositol 4,5-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-4-phosphate 5-phosphotransferase. Other names in common use include diphosphoinositide kinase, PIP kinase, phosphatidylinositol 4-phosphate kinase, phosphatidylinositol-4-phosphate 5-kinase, and type I PIP kinase. This enzyme participates in 3 metabolic pathways: inositol phosphate metabolism, phosphatidylinositol signaling system, and regulation of the actin cytoskeleton.

Structural studies
As of late 2007, two structures have been solved for this class of enzymes, with PDB accession codes and.