National Natural Science Foundation of China (NSFC)
中国
引用
ジャーナル: Nat Chem Biol / 年: 2025 タイトル: Mechanism of nucleosomal H2A K13/15 monoubiquitination and adjacent dual monoubiquitination by RNF168. 著者: Huasong Ai / Zebin Tong / Zhiheng Deng / Qiang Shi / Shixian Tao / Gaoge Sun / Jiawei Liang / Maoshen Sun / Xiangwei Wu / Qingyun Zheng / Lujun Liang / Hang Yin / Jia-Bin Li / Shuai Gao / ...著者: Huasong Ai / Zebin Tong / Zhiheng Deng / Qiang Shi / Shixian Tao / Gaoge Sun / Jiawei Liang / Maoshen Sun / Xiangwei Wu / Qingyun Zheng / Lujun Liang / Hang Yin / Jia-Bin Li / Shuai Gao / Changlin Tian / Lei Liu / Man Pan / 要旨: The DNA damage repair regulatory protein RNF168, a monomeric RING-type E3 ligase, has a crucial role in regulating cell fate and DNA repair by specific and efficient ubiquitination of the adjacent ...The DNA damage repair regulatory protein RNF168, a monomeric RING-type E3 ligase, has a crucial role in regulating cell fate and DNA repair by specific and efficient ubiquitination of the adjacent K13 and K15 (K13/15) sites at the H2A N-terminal tail. However, understanding how RNF168 coordinates with its cognate E2 enzyme UbcH5c to site-specifically ubiquitinate H2A K13/15 has long been hampered by the lack of high-resolution structures of RNF168 and UbcH5c~Ub (ubiquitin) in complex with nucleosomes. Here we developed chemical strategies and determined the cryo-electron microscopy structures of the RNF168-UbcH5c~Ub-nucleosome complex captured in transient H2A K13/15 monoubiquitination and adjacent dual monoubiquitination reactions, providing a 'helix-anchoring' mode for monomeric E3 ligase RNF168 on nucleosome in contrast to the 'compass-binding' mode of dimeric E3 ligases. Our work not only provides structural snapshots of H2A K13/15 site-specific monoubiquitination and adjacent dual monoubiquitination but also offers a near-atomic-resolution structural framework for understanding pathogenic amino acid substitutions and physiological modifications of RNF168.