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Smc3 Deacetylation by Hos1 Facilitates Efficient Dissolution of Sister Chromatid Cohesion during Early Anaphase.
Molecular Cell ( IF 14.5 ) Pub Date : 2017-11-02 , DOI: 10.1016/j.molcel.2017.10.009
Shuyu Li 1 , Zuojun Yue 1 , Tomoyuki U Tanaka 1
Affiliation  

Cohesins establish sister chromatid cohesion during S phase and are removed when cohesin Scc1 is cleaved by separase at anaphase onset. During this process, cohesin Smc3 undergoes a cycle of acetylation: Smc3 acetylation by Eco1 in S phase stabilizes cohesin association with chromosomes, and its deacetylation by Hos1 in anaphase allows re-use of Smc3 in the next cell cycle. Here we find that Smc3 deacetylation by Hos1 has a more immediate effect in the early anaphase of budding yeast. Hos1 depletion significantly delayed sister chromatid separation and segregation. Smc3 deacetylation facilitated removal of cohesins from chromosomes without changing Scc1 cleavage efficiency, promoting dissolution of cohesion. This action is probably due to disengagement of Smc1-Smc3 heads prompted by de-repression of their ATPase activity. We suggest Scc1 cleavage per se is insufficient for efficient dissolution of cohesion in early anaphase; subsequent Smc3 deacetylation, triggered by Scc1 cleavage, is also required.

中文翻译:


Hos1 对 Smc3 的去乙酰化促进早期后期姐妹染色单体凝聚力的有效溶解。



粘连蛋白在 S 期建立姐妹染色单体粘连,并在粘连蛋白 Scc1 在后期开始时被分离酶裂解时被去除。在此过程中,粘连蛋白 Smc3 经历乙酰化循环:在 S 期由 Eco1 进行的 Smc3 乙酰化稳定了粘连蛋白与染色体的关联,而在后期由 Hos1 进行的去乙酰化则允许在下一个细胞周期中重新使用 Smc3。在这里,我们发现Hos1对Smc3的脱乙酰作用在芽殖酵母的早期后期具有更直接的效果。 Hos1 耗尽显着延迟了姐妹染色单体的分离和分离。 Smc3 脱乙酰化有助于从染色体上去除粘连蛋白,而不改变 Scc1 切割效率,从而促进粘连的溶解。这一作用可能是由于 Smc1-Smc3 头的 ATP 酶活性去抑制所致。我们认为 Scc1 裂解本身不足以有效溶解早期后期的内聚力;随后由 Scc1 裂解触发的 Smc3 脱乙酰化也是必需的。
更新日期:2017-11-02
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