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박승주,이슬기,박승은,김세윤 한국통합생물학회 2018 Animal cells and systems Vol.22 No.1
Inositol pyrophosphates (PP-IPs) such as 5-diphosphoinositol pentakisphosphate (5-IP7) are inositol metabolites with high-energy phosphoanhydride bonds. The formation of PP-IPs is catalyzed by two groups of enzymes, the IP6 kinases and the PPIP5 kinases, which both phosphorylate inositol hexakisphosphate (IP6). In mammals, PP-IPs are implicated in diverse biological phenomena including cellular growth, vesicular trafficking, apoptosis, and metabolic homeostasis. Mechanistically, all the diverse actions of PP-IPs proceed in one of two ways: the PP-IPs modulate the activity of their target proteins either through allosteric binding or protein pyrophosphorylation. In this review, we highlight recent advances in our understanding of the pleiotropic functions of the mammalian PP-IPs and the metabolic enzymes that produce them. We also discuss some future challenges in the exploration of areas where PP-IPs play important but unknown roles in physiology and disease.