TY - JOUR

T1 - Systems-wide Analysis of Serine ADP-Ribosylation Reveals Widespread Occurrence and Site-Specific Overlap with Phosphorylation

AU - Larsen, Sara C.

AU - Hendriks, Ivo A.

AU - Lyon, David

AU - Jensen, Lars J.

AU - Nielsen, Michael L.

N1 - Copyright © 2018 The Author(s). Published by Elsevier Inc. All rights reserved.

PY - 2018

Y1 - 2018

N2 - ADP-ribosylation (ADPr) is a reversible posttranslational modification involved in a range of cellular processes. Here, we report system-wide identification of serine ADPr in human cells upon oxidative stress. High-resolution mass spectrometry and unrestricted data processing confirm that serine residues are the major target of ADPr in HeLa cells. Proteome-wide analysis identifies 3,090 serine ADPr sites, with 97% of acceptor sites modulating more than 2-fold upon oxidative stress, while treatment with the poly (ADP-ribose) polymerase (PARP) inhibitor olaparib abrogates this induction. Serine ADPr predominantly targets nuclear proteins, while structural-predictive analyses reveal that serine ADPr preferentially targets disordered protein regions. The identified ADP-ribosylated serines significantly overlap with known phosphorylated serines, and large-scale phosphoproteomics analysis provides evidence for site-specific crosstalk between serine ADPr and phosphorylation. Collectively, we demonstrate that serine ADPr is a widespread modification and a major nuclear signaling response to oxidative stress, with a regulatory scope comparable to other extensive posttranslational modifications.

AB - ADP-ribosylation (ADPr) is a reversible posttranslational modification involved in a range of cellular processes. Here, we report system-wide identification of serine ADPr in human cells upon oxidative stress. High-resolution mass spectrometry and unrestricted data processing confirm that serine residues are the major target of ADPr in HeLa cells. Proteome-wide analysis identifies 3,090 serine ADPr sites, with 97% of acceptor sites modulating more than 2-fold upon oxidative stress, while treatment with the poly (ADP-ribose) polymerase (PARP) inhibitor olaparib abrogates this induction. Serine ADPr predominantly targets nuclear proteins, while structural-predictive analyses reveal that serine ADPr preferentially targets disordered protein regions. The identified ADP-ribosylated serines significantly overlap with known phosphorylated serines, and large-scale phosphoproteomics analysis provides evidence for site-specific crosstalk between serine ADPr and phosphorylation. Collectively, we demonstrate that serine ADPr is a widespread modification and a major nuclear signaling response to oxidative stress, with a regulatory scope comparable to other extensive posttranslational modifications.

KW - ADP-ribosylation

KW - ADPr

KW - DNA damage

KW - mass spectrometry

KW - oxidative stress

KW - PARP inhibitor

KW - phosphorylation

KW - post-translational modification

KW - proteomics

KW - PTM

KW - serine ADP-ribosylation

U2 - 10.1016/j.celrep.2018.07.083

DO - 10.1016/j.celrep.2018.07.083

M3 - Journal article

C2 - 30157440

VL - 24

SP - 2493

EP - 2505

JO - Cell Reports

JF - Cell Reports

SN - 2211-1247

IS - 9

ER -