Liquid Demixing of Intrinsically Disordered Proteins is Seeded by Poly(ADP-ribose)

Overview

Journal Nat Commun

Specialty Biology

Date 2015 Aug 20

PMID 26286827

Citations 305

Authors

Matthias Altmeyer

Kai J Neelsen

Federico Teloni

Irina Pozdnyakova

Stefania Pellegrino

Merete Grofte

Maj-Britt Druedahl Rask

Werner Streicher

Stephanie Jungmichel

Michael Lund Nielsen

Jiri Lukas

Affiliations

Soon will be listed here.

Abstract

Intrinsically disordered proteins can phase separate from the soluble intracellular space, and tend to aggregate under pathological conditions. The physiological functions and molecular triggers of liquid demixing by phase separation are not well understood. Here we show in vitro and in vivo that the nucleic acid-mimicking biopolymer poly(ADP-ribose) (PAR) nucleates intracellular liquid demixing. PAR levels are markedly induced at sites of DNA damage, and we provide evidence that PAR-seeded liquid demixing results in rapid, yet transient and fully reversible assembly of various intrinsically disordered proteins at DNA break sites. Demixing, which relies on electrostatic interactions between positively charged RGG repeats and negatively charged PAR, is amplified by aggregation-prone prion-like domains, and orchestrates the earliest cellular responses to DNA breakage. We propose that PAR-seeded liquid demixing is a general mechanism to dynamically reorganize the soluble nuclear space with implications for pathological protein aggregation caused by derailed phase separation.

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