Mechanism and function of DNA replication-independent DNA-protein crosslink repair via the SUMO-RNF4 pathway
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Mechanism and function of DNA replication-independent DNA-protein crosslink repair via the SUMO-RNF4 pathway. / Liu, Julio C Y; Kühbacher, Ulrike; Larsen, Nicolai B; Borgermann, Nikoline; Garvanska, Dimitriya H; Hendriks, Ivo A; Ackermann, Leena; Haahr, Peter; Gallina, Irene; Guérillon, Claire; Branigan, Emma; Hay, Ronald T.; Azuma, Yoshiaki; Nielsen, Michael Lund; Duxin, Julien P; Mailand, Niels.
In: E M B O Journal, Vol. 40, e107413, 2021.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - Mechanism and function of DNA replication-independent DNA-protein crosslink repair via the SUMO-RNF4 pathway
AU - Liu, Julio C Y
AU - Kühbacher, Ulrike
AU - Larsen, Nicolai B
AU - Borgermann, Nikoline
AU - Garvanska, Dimitriya H
AU - Hendriks, Ivo A
AU - Ackermann, Leena
AU - Haahr, Peter
AU - Gallina, Irene
AU - Guérillon, Claire
AU - Branigan, Emma
AU - Hay, Ronald T.
AU - Azuma, Yoshiaki
AU - Nielsen, Michael Lund
AU - Duxin, Julien P
AU - Mailand, Niels
N1 - © 2021 The Authors. Published under the terms of the CC BY 4.0 license.
PY - 2021
Y1 - 2021
N2 - DNA-protein crosslinks (DPCs) obstruct essential DNA transactions, posing a serious threat to genome stability and functionality. DPCs are proteolytically processed in a ubiquitin- and DNA replication-dependent manner by SPRTN and the proteasome but can also be resolved via targeted SUMOylation. However, the mechanistic basis of SUMO-mediated DPC resolution and its interplay with replication-coupled DPC repair remain unclear. Here, we show that the SUMO-targeted ubiquitin ligase RNF4 defines a major pathway for ubiquitylation and proteasomal clearance of SUMOylated DPCs in the absence of DNA replication. Importantly, SUMO modifications of DPCs neither stimulate nor inhibit their rapid DNA replication-coupled proteolysis. Instead, DPC SUMOylation provides a critical salvage mechanism to remove DPCs formed after DNA replication, as DPCs on duplex DNA do not activate interphase DNA damage checkpoints. Consequently, in the absence of the SUMO-RNF4 pathway cells are able to enter mitosis with a high load of unresolved DPCs, leading to defective chromosome segregation and cell death. Collectively, these findings provide mechanistic insights into SUMO-driven pathways underlying replication-independent DPC resolution and highlight their critical importance in maintaining chromosome stability and cellular fitness.
AB - DNA-protein crosslinks (DPCs) obstruct essential DNA transactions, posing a serious threat to genome stability and functionality. DPCs are proteolytically processed in a ubiquitin- and DNA replication-dependent manner by SPRTN and the proteasome but can also be resolved via targeted SUMOylation. However, the mechanistic basis of SUMO-mediated DPC resolution and its interplay with replication-coupled DPC repair remain unclear. Here, we show that the SUMO-targeted ubiquitin ligase RNF4 defines a major pathway for ubiquitylation and proteasomal clearance of SUMOylated DPCs in the absence of DNA replication. Importantly, SUMO modifications of DPCs neither stimulate nor inhibit their rapid DNA replication-coupled proteolysis. Instead, DPC SUMOylation provides a critical salvage mechanism to remove DPCs formed after DNA replication, as DPCs on duplex DNA do not activate interphase DNA damage checkpoints. Consequently, in the absence of the SUMO-RNF4 pathway cells are able to enter mitosis with a high load of unresolved DPCs, leading to defective chromosome segregation and cell death. Collectively, these findings provide mechanistic insights into SUMO-driven pathways underlying replication-independent DPC resolution and highlight their critical importance in maintaining chromosome stability and cellular fitness.
U2 - 10.15252/embj.2020107413
DO - 10.15252/embj.2020107413
M3 - Journal article
C2 - 34346517
VL - 40
JO - E M B O Journal
JF - E M B O Journal
SN - 0261-4189
M1 - e107413
ER -
ID: 275948647