This gene encodes a protein that belongs to the inositol phosphokinase (IPK) family. This protein is likely responsible for the conversion of inositol hexakisphosphate (InsP6) to diphosphoinositol pentakisphosphate (InsP7/PP-InsP5). It may also convert 1,3,4,5,6-pentakisphosphate (InsP5) to PP-InsP4. Alternative splicing results in multiple transcript variants encoding the same protein.[provided by RefSeq, Dec 2008].
Saiardi, Nagata, Luo, Snowman, Snyder: "Identification and characterization of a novel inositol hexakisphosphate kinase." in: The Journal of biological chemistry, Vol. 276, Issue 42, pp. 39179-85, (2001) (PubMed).