Smc3 Deacetylation by Hos1 Facilitates Efficient Dissolution of Sister Chromatid Cohesion during Early Anaphase

Shuyu Li, Zuojun Yue, Tomoyuki U. Tanaka (Lead / Corresponding author)

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11 Citations (Scopus)
162 Downloads (Pure)

Abstract

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 Smc3 deacetylation by Hos1 has a more immediate effect in 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 Smc1–3 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, but subsequent Smc3 deacetylation, triggered by Scc1 cleavage, is also required.
Original languageEnglish
Pages (from-to)605-614
Number of pages10
JournalMolecular Cell
Volume68
Issue number3
DOIs
Publication statusPublished - 2 Nov 2017

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