Abstract
A cDNA cloned from its ability to stimulate inorganic phosphate uptake in Xenopus oocytes (phosphate uptake stimulator (PiUS)) shows significant similarity with inositol 1,4,5-trisphosphate 3-kinase. However, the expressed PiUS protein showed no detectable activity against inositol 1,4,5-trisphosphate, nor the 1,3,4,5- or 3,4,5,6-isomers of inositol tetrakisphosphate, whereas it was very active in converting inositol hexakisphosphate (InsP 6) to inositol heptakisphosphate (InsP 7). PiUS is a member of a family of enzymes found in many eukaryotes and we discuss the implications of this for the functions of InsP 7 and for the evolution of inositol phosphate kinases.
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