Structure and function of cohesin's Scc3/SA regulatory subunit.
Structure and function of cohesin's Scc3/SA regulatory subunit.
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DOI:
10.1016/j.febslet.2014.08.015
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发表时间:
2014-10-16
期刊:
影响因子:
3.5
通讯作者:
Nasmyth K
中科院分区:
文献类型:
--
作者:
Roig MB;Löwe J;Chan KL;Beckouët F;Metson J;Nasmyth K
Crystal structure of cohesin subunit Scc3/SA, showing irregular HEAT-like repeats. Scc3 C-terminal domain binds Scc1, cohesin’s kleisin. Scc1’s Scc3 binding region mapped. Scc3 turns over in G2/M while maintaining cohesin’s association with chromosomes. Scc3 promotes de-acetylation of Smc3 upon Scc1 cleavage. Sister chromatid cohesion involves entrapment of sister DNAs by a cohesin ring created through association of a kleisin subunit (Scc1) with ATPase heads of Smc1/Smc3 heterodimers. Cohesin’s association with chromatin involves subunits recruited by Scc1: Wapl, Pds5, and Scc3/SA, in addition to Scc2/4 loading complex. Unlike Pds5, Wapl, and Scc2/4, Scc3s are encoded by all eukaryotic genomes. Here, a crystal structure of Scc3 reveals a hook-shaped protein composed of tandem α helices. Its N-terminal domain contains a conserved and essential surface (CES) present even in organisms lacking Pds5, Wapl, and Scc2/4, while its C-terminal domain binds a section of the kleisin Scc1. Scc3 turns over in G2/M while maintaining cohesin’s association with chromosomes and it promotes de-acetylation of Smc3 upon Scc1 cleavage.
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