PCAF/GCN5-Mediated Acetylation of RPA1 Promotes Nucleotide Excision Repair

Publication date: 29 August 2017
Source:Cell Reports, Volume 20, Issue 9
Author(s): Meimei Zhao, Rui Geng, Xiang Guo, Ruoshi Yuan, Xiao Zhou, Yanyan Zhong, Yanfei Huo, Mei Zhou, Qinjian Shen, Yinglu Li, Weiguo Zhu, Jiadong Wang
The RPA complex can integrate multiple stress signals into diverse responses by activating distinct DNA repair pathways. However, it remains unclear how RPA1 elects to activate a specific repair pathway during different types of DNA damage. Here, we report that PCAF/GCN5-mediated K163 acetylation of RPA1 is crucial for nucleotide excision repair (NER) but is dispensable for other DNA repair pathways. Mechanistically, we demonstrate that the acetylation of RPA1 is critical for the steady accumulation of XPA at damaged DNA sites and preferentially activates the NER pathway. DNA-PK phosphorylates and activates PCAF upon UV damage and consequently promotes the acetylation of RPA1. Moreover, the acetylation of RPA1 is tightly regulated by HDAC6 and SIRT1. Together, our results demonstrate that the K163 acetylation of RPA1 plays a key role in the repair of UV-induced DNA damage and reveal how the specific RPA1 modification modulates the choice of distinct DNA repair pathways.

Graphical abstract

Teaser

RPA complex is a central player in multiple DNA repair pathways. Zhao et al. show that PCAF/GCN5-mediated acetylation of RPA1 is crucial for NER repair by promoting stable RPA1/XPA complex.


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