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1349136 
Journal Article 
Inositol hexakisphosphate kinase products contain diphosphate and triphosphate groups 
Draskovic, P; Saiardi, A; Bhandari, R; Burton, A; Ilc, G; Kovacevic, M; Snyder, SH; Podobnik, M 
2008 
Yes 
Chemistry and Biology
ISSN: 1074-5521 
15 
3 
274-286 
English 
18355727 
Eukaryotic cells produce a family of diverse inositol polyphosphates (IPs) containing pyrophosphate bonds. Inositol pyrophosphates have been linked to a wide range of cellular functions, and there is growing evidence that they act as second messengers. Inositol hexakisphosphate kinase (IP6K) is able to convert the natural substrates inositol pentakisphosphate (IP 5) and inositol hexakisphosphate (IP 6) to several products with an increasing number of phospho-anhydride bonds. In this study, we structurally analyzed IPs synthesized by three mammalian isoforms of IP6K from IP 5 and IP 6. The NMR and mass analyses showed a number of products with diverse, yet specific, stereochemistry, defined by the architecture of IP6K's active site. We now report that IP6K synthesizes both pyrophosphate (diphospho) as well as triphospho groups on the inositol ring. All three IP6K isoforms share the same activities both in vitro and in vivo.