First synthetic analogues of diphosphoinositol polyphosphates: Interaction with PP-InsP5 kinase

Abstract

We synthesised analogues of diphosphoinositol polyphosphates (PP-InsPs) in which the diphosphate is replaced by an α-phosphonoacetic acid (PA) ester. Structural analysis revealed that 5-PA-InsP5 mimics 5-PP-InsP5 binding to the kinase domain of PPIP5K2; both molecules were phosphorylated by the enzyme. PA-InsPs are promising candidates for further studies into the biology of PP-InsPs. © 2012 The Royal Society of Chemistry.