Protein pyrophosphorylation by inositol pyrophosphates is a posttranslational event.

Bhandari, Rashna; Saiardi, Adolfo; Ahmadibeni, Yousef; Snowman, Adele M; Resnick, Adam C; Kristiansen, Troels Z; Molina, Henrik; Pandey, Akhilesh et al. · Proc Natl Acad Sci U S A · 2007

basic_science · Level V

Where this comes from

Abstract

In a previous study, we showed that the inositol pyrophosphate diphosphoinositol pentakisphosphate (IP(7)) physiologically phosphorylates mammalian and yeast proteins. We now report that this phosphate transfer reflects pyrophosphorylation. Thus, proteins must be prephosphorylated by ATP to prime them for IP(7) phosphorylation. IP(7) phosphorylates synthetic phosphopeptides but not if their phosphates have been masked by methylation or pyrophosphorylation. Moreover, IP(7) phosphorylated peptides are more acid-labile and more resistant to phosphatases than ATP phosphorylated peptides, indicating a different type of phosphate bond. Pyrophosphorylation may represent a novel mode of signaling to proteins.

Medical subject headings