» Articles » PMID: 27060134

A Ubiquitylation Site in Cockayne Syndrome B Required for Repair of Oxidative DNA Damage, but Not for Transcription-coupled Nucleotide Excision Repair

Abstract

Cockayne syndrome B (CSB), best known for its role in transcription-coupled nucleotide excision repair (TC-NER), contains a ubiquitin-binding domain (UBD), but the functional connection between protein ubiquitylation and this UBD remains unclear. Here, we show that CSB is regulated via site-specific ubiquitylation. Mass spectrometry analysis of CSB identified lysine (K) 991 as a ubiquitylation site. Intriguingly, mutation of this residue (K991R) does not affect CSB's catalytic activity or protein stability, but greatly affects genome stability, even in the absence of induced DNA damage. Moreover, cells expressing CSB K991R are sensitive to oxidative DNA damage, but proficient for TC-NER. K991 becomes ubiquitylated upon oxidative DNA damage, and while CSB K991R is recruited normally to such damage, it fails to dissociate in a timely manner, suggesting a requirement for K991 ubiquitylation in CSB activation. Interestingly, deletion of CSB's UBD gives rise to oxidative damage sensitivity as well, while CSB ΔUBD and CSB K991R affects expression of overlapping groups of genes, further indicating a functional connection. Together, these results shed new light on the regulation of CSB, with K991R representing an important separation-of-function-mutation in this multi-functional protein.

Citing Articles

New Discoveries on Protein Recruitment and Regulation during the Early Stages of the DNA Damage Response Pathways.

Waters K, Spratt D Int J Mol Sci. 2024; 25(3).

PMID: 38338953 PMC: 10855619. DOI: 10.3390/ijms25031676.


Role of Cockayne Syndrome Group B Protein in Replication Stress: Implications for Cancer Therapy.

Walker J, Zhu X Int J Mol Sci. 2022; 23(18).

PMID: 36142121 PMC: 9499456. DOI: 10.3390/ijms231810212.


RNAPII response to transcription-blocking DNA lesions in mammalian cells.

Wang J, Sadurni M, Saponaro M FEBS J. 2022; 290(18):4382-4394.

PMID: 35731652 PMC: 10952651. DOI: 10.1111/febs.16561.


XPG: a multitasking genome caretaker.

Muniesa-Vargas A, Theil A, Ribeiro-Silva C, Vermeulen W, Lans H Cell Mol Life Sci. 2022; 79(3):166.

PMID: 35230528 PMC: 8888383. DOI: 10.1007/s00018-022-04194-5.


Aldehyde-driven transcriptional stress triggers an anorexic DNA damage response.

Mulderrig L, Garaycoechea J, Tuong Z, Millington C, Dingler F, Ferdinand J Nature. 2021; 600(7887):158-163.

PMID: 34819667 DOI: 10.1038/s41586-021-04133-7.


References
1.
Groisman R, Kuraoka I, Chevallier O, Gaye N, Magnaldo T, Tanaka K . CSA-dependent degradation of CSB by the ubiquitin-proteasome pathway establishes a link between complementation factors of the Cockayne syndrome. Genes Dev. 2006; 20(11):1429-34. PMC: 1475755. DOI: 10.1101/gad.378206. View

2.
Fousteri M, Vermeulen W, van Zeeland A, Mullenders L . RETRACTED: Cockayne syndrome A and B proteins differentially regulate recruitment of chromatin remodeling and repair factors to stalled RNA polymerase II in vivo. Mol Cell. 2006; 23(4):471-82. DOI: 10.1016/j.molcel.2006.06.029. View

3.
van Cuijk L, van Belle G, Turkyilmaz Y, Poulsen S, Janssens R, Theil A . SUMO and ubiquitin-dependent XPC exchange drives nucleotide excision repair. Nat Commun. 2015; 6:7499. PMC: 4501428. DOI: 10.1038/ncomms8499. View

4.
Anindya R, Mari P, Kristensen U, Kool H, Giglia-Mari G, Mullenders L . A ubiquitin-binding domain in Cockayne syndrome B required for transcription-coupled nucleotide excision repair. Mol Cell. 2010; 38(5):637-48. PMC: 2885502. DOI: 10.1016/j.molcel.2010.04.017. View

5.
Scheibye-Knudsen M, Mitchell S, Fang E, Iyama T, Ward T, Wang J . A high-fat diet and NAD(+) activate Sirt1 to rescue premature aging in cockayne syndrome. Cell Metab. 2014; 20(5):840-855. PMC: 4261735. DOI: 10.1016/j.cmet.2014.10.005. View