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-Structure paper
タイトル | Molecular mechanisms of Holliday junction branch migration catalyzed by an asymmetric RuvB hexamer. |
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ジャーナル・号・ページ | Nat Commun, Vol. 14, Issue 1, Page 3549, Year 2023 |
掲載日 | 2023年6月15日 |
著者 | Anthony D Rish / Zhangfei Shen / Zhenhang Chen / Nan Zhang / Qingfei Zheng / Tian-Min Fu / |
PubMed 要旨 | The Holliday junction (HJ) is a DNA intermediate of homologous recombination, involved in many fundamental physiological processes. RuvB, an ATPase motor protein, drives branch migration of the ...The Holliday junction (HJ) is a DNA intermediate of homologous recombination, involved in many fundamental physiological processes. RuvB, an ATPase motor protein, drives branch migration of the Holliday junction with a mechanism that had yet to be elucidated. Here we report two cryo-EM structures of RuvB, providing a comprehensive understanding of HJ branch migration. RuvB assembles into a spiral staircase, ring-like hexamer, encircling dsDNA. Four protomers of RuvB contact the DNA backbone with a translocation step size of 2 nucleotides. The variation of nucleotide-binding states in RuvB supports a sequential model for ATP hydrolysis and nucleotide recycling, which occur at separate, singular positions. RuvB's asymmetric assembly also explains the 6:4 stoichiometry between the RuvB/RuvA complex, which coordinates HJ migration in bacteria. Taken together, we provide a mechanistic understanding of HJ branch migration facilitated by RuvB, which may be universally shared by prokaryotic and eukaryotic organisms. |
リンク | Nat Commun / PubMed:37322069 / PubMed Central |
手法 | EM (単粒子) |
解像度 | 2.97 - 4.3 Å |
構造データ | EMDB-28101, PDB-8efv: EMDB-28107, PDB-8efy: EMDB-40036, PDB-8gh8: |
化合物 | ChemComp-AGS: ChemComp-MG: ChemComp-ADP: |
由来 |
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キーワード | STRUCTURAL PROTEIN / Holliday Junction / AAA+ ATPase / RuvB / Homo-hexamer / DNA recombination / DNA BINDING PROTEIN/DNA / tetramer / RuvA / DNA BINDING PROTEIN / DNA BINDING PROTEIN-DNA complex |