The FACT complex interacts with the E3 ubiquitin ligase Psh1 to prevent ectopic localization of CENP-A.

The FACT complex interacts with the E3 ubiquitin ligase Psh1 to prevent ectopic localization of CENP-A.
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DOI:
10.1101/gad.243113.114
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发表时间:
2014-08-15
影响因子:
10.5
通讯作者:
Biggins S
Biggins S
中科院分区:
生物学1区
文献类型:
--
作者:
Deyter GM;Biggins S

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着丝粒身份及其表观遗传维持需要在着丝粒处掺入组蛋白 H3 变体 CENP-A。 CENP-A 错误定位可能会破坏基于染色质的过程和染色体分离。在这里,Deyter 和 Biggins 确定了保守的染色质修饰复合物 FACT 通过介导其蛋白水解来防止 CENP-ACse4 错误定位到常染色质中的作用。 FACT 复合物的芽殖酵母 Spt16 亚基与 Psh1 结合,Psh1 是一种以 CENP-ACse4 为目标进行降解的 E3 泛素连接酶。无法与 FACT 关联的 Psh1 突变体在体内与 CENP-ACse4 的相互作用减少。着丝粒身份及其表观遗传维持需要在着丝粒处掺入称为 CENP-A 的组蛋白 H3 变体。 CENP-A 错误定位到异位位点可能会破坏基于染色质的过程和染色体分离,因此揭示该变体专门定位于着丝粒的机制非常重要。在这里,我们确定了保守的染色质修饰复合物 FACT(促进染色质转录/交易)通过介导其蛋白水解来防止芽殖酵母 CENP-ACse4 错误定位到常染色质中的作用。 FACT 复合物的 Spt16 亚基与 Psh1 (Pob3/Spt16/组蛋白) 结合,Psh1 是一种以 CENP-ACse4 为目标进行降解的 E3 泛素连接酶。 Psh1 和 Spt16 之间的相互作用对于 CENP-ACse4 泛素化及其从常染色质中排除至关重要。我们发现 Psh1 不能在体外有效地泛素化 CENP-ACse4 核小体,这表明其他因素必须促进 CENP-ACse4 在体内从染色质中去除。与此一致的是,不能与 FACT 关联的 Psh1 突变体在体内与 CENP-ACse4 的相互作用减少。总之,我们的数据确定了一种以前未知的机制,通过 FACT 介导的异位定位 CENP-ACse4 降解来维持着丝粒身份和基因组稳定性。
Centromere identity and its epigenetic maintenance require the incorporation of the histone H3 variant CENP-A at centromeres. CENP-A mislocalization may disrupt chromatin-based processes and chromosome segregation. Here, Deyter and Biggins identify a role for the conserved chromatin-modifying complex FACT in preventing CENP-ACse4 mislocalization to euchromatin by mediating its proteolysis. The budding yeast Spt16 subunit of the FACT complex binds to Psh1, an E3 ubiquitin ligase that targets CENP-ACse4 for degradation. A Psh1 mutant that cannot associate with FACT has a reduced interaction with CENP-ACse4 in vivo. Centromere identity and its epigenetic maintenance require the incorporation of a histone H3 variant called CENP-A at centromeres. CENP-A mislocalization to ectopic sites may disrupt chromatin-based processes and chromosome segregation, so it is important to uncover the mechanisms by which this variant is exclusively localized to centromeres. Here, we identify a role for the conserved chromatin-modifying complex FACT (facilitates chromatin transcription/transactions) in preventing budding yeast CENP-ACse4 mislocalization to euchromatin by mediating its proteolysis. The Spt16 subunit of the FACT complex binds to Psh1 (Pob3/Spt16/histone), an E3 ubiquitin ligase that targets CENP-ACse4 for degradation. The interaction between Psh1 and Spt16 is critical for both CENP-ACse4 ubiquitylation and its exclusion from euchromatin. We found that Psh1 cannot efficiently ubiquitylate CENP-ACse4 nucleosomes in vitro, suggesting that additional factors must facilitate CENP-ACse4 removal from chromatin in vivo. Consistent with this, a Psh1 mutant that cannot associate with FACT has a reduced interaction with CENP-ACse4 in vivo. Together, our data identify a previously unknown mechanism to maintain centromere identity and genomic stability through the FACT-mediated degradation of ectopically localized CENP-ACse4.
DOI: 10.1083/jcb.201001013
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作者:
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