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The RING finger protein RNF8 ubiquitinates Nbs1 to promote DNA double-strand break repair by homologous recombination.

  • Author(s): Lu, Chi-Sheng;
  • Truong, Lan N;
  • Aslanian, Aaron;
  • Shi, Linda Z;
  • Li, Yongjiang;
  • Hwang, Patty Yi-Hwa;
  • Koh, Kwi Hye;
  • Hunter, Tony;
  • Yates, John R;
  • Berns, Michael W;
  • Wu, Xiaohua
  • et al.
Abstract

Ubiquitination plays an important role in the DNA damage response. We identified a novel interaction of the E3 ubiquitin ligase RNF8 with Nbs1, a key regulator of DNA double-strand break (DSB) repair. We found that Nbs1 is ubiquitinated both before and after DNA damage and is a direct ubiquitination substrate of RNF8. We also identified key residues on Nbs1 that are ubiquitinated by RNF8. By using laser microirradiation and live-cell imaging, we observed that RNF8 and its ubiquitination activity are important for promoting optimal binding of Nbs1 to DSB-containing chromatin. We also demonstrated that RNF8-mediated ubiquitination of Nbs1 contributes to the efficient and stable binding of Nbs1 to DSBs and is important for HR-mediated DSB repair. Taken together, these studies suggest that Nbs1 is one important target of RNF8 to regulate DNA DSB repair.

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