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-Structure paper
タイトル | Cryo-EM structures of Smc5/6 in multiple states reveal its assembly and functional mechanisms. |
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ジャーナル・号・ページ | Nat Struct Mol Biol, Vol. 31, Issue 10, Page 1532-1542, Year 2024 |
掲載日 | 2024年6月18日 |
![]() | Qian Li / Jun Zhang / Cory Haluska / Xiang Zhang / Lei Wang / Guangfeng Liu / Zhaoning Wang / Duo Jin / Tong Cheng / Hongxia Wang / Yuan Tian / Xiangxi Wang / Lei Sun / Xiaolan Zhao / Zhenguo Chen / Lanfeng Wang / ![]() ![]() |
PubMed 要旨 | Smc5/6 is a member of the eukaryotic structural maintenance of chromosomes (SMC) family of complexes with important roles in genome maintenance and viral restriction. However, limited structural ...Smc5/6 is a member of the eukaryotic structural maintenance of chromosomes (SMC) family of complexes with important roles in genome maintenance and viral restriction. However, limited structural understanding of Smc5/6 hinders the elucidation of its diverse functions. Here, we report cryo-EM structures of the budding yeast Smc5/6 complex in eight-subunit, six-subunit and five-subunit states. Structural maps throughout the entire length of these complexes reveal modularity and key elements in complex assembly. We show that the non-SMC element (Nse)2 subunit supports the overall shape of the complex and uses a wedge motif to aid the stability and function of the complex. The Nse6 subunit features a flexible hook region for attachment to the Smc5 and Smc6 arm regions, contributing to the DNA repair roles of the complex. Our results also suggest a structural basis for the opposite effects of the Nse1-3-4 and Nse5-6 subcomplexes in regulating Smc5/6 ATPase activity. Collectively, our integrated structural and functional data provide a framework for understanding Smc5/6 assembly and function. |
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手法 | EM (単粒子) |
解像度 | 3.2 - 8.5 Å |
構造データ | EMDB-33914, PDB-7ylm: EMDB-33927, PDB-7ymd: EMDB-34025, PDB-7yqh: EMDB-34953, PDB-8hqs: EMDB-35116, PDB-8i13: EMDB-35128, PDB-8i21: EMDB-35184, PDB-8i4u: EMDB-35185, PDB-8i4v: EMDB-35186, PDB-8i4w: EMDB-35187, PDB-8i4x: EMDB-37584, PDB-8wjl: EMDB-37586, PDB-8wjn: EMDB-37587, PDB-8wjo: ![]() EMDB-60245: Smc5/6-5mer consensus map ![]() EMDB-60246: Smc5/6-6mer consensus map |
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![]() | CELL CYCLE |