SUMOylation regulates telomere length homeostasis by targeting Cdc13.

SUMOylation regulates telomere length homeostasis by targeting Cdc13.
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DOI:
10.1038/nsmb.2100
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发表时间:
2011-07-10
影响因子:
16.8
通讯作者:
--
中科院分区:
生物学1区
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端粒长度动态平衡是端粒生物学的一个重要方面。在这里,我们表明SUMOylation限制了酿酒酵母的端粒长度,并针对多个端粒蛋白。主要靶点是Cdc13,它既能积极调节端粒酶,也能消极调节端粒酶,并提供端粒保护。我们证明Cdc13 summoylation通过促进Cdc13与端粒酶抑制剂Stn1的相互作用来抑制端粒酶的功能,而不影响端粒保护。Cdc13 sumo化位点(Cdc13- snm)的突变延长了端粒并减少了Stn1相互作用,而Cdc13- sumo融合具有相反的作用。cdc13-snm对端粒长度的影响与stn1等位基因是上位性的,而与yku70、tel1和est1等位基因无关,并且被stn1过表达抑制。Cdc13的summoylation在S期早期至中期达到峰值,在其已知的cdk1介导的磷酸化之前,这两种修饰具有拮抗作用,表明Cdc13在端粒酶调节中的相反作用可以暂时分离,并通过不同的修饰进行调节。
Telomere length homeostasis is an important aspect of telomere biology. Here we show that SUMOylation limits telomere length and targets multiple telomere proteins in Saccharomyces cerevisiae. A main target is Cdc13, which both positively and negatively regulates telomerase and confers end protection. We demonstrate that Cdc13 SUMOylation restrains telomerase functions by promoting Cdc13 interaction with the telomerase inhibitor Stn1, without affecting end protection. Mutation of the Cdc13 SUMOylation site (cdc13-snm) lengthens telomeres and reduces the Stn1 interaction, whereas Cdc13-SUMO fusion has the opposite effects. cdc13-snm's effect on telomere length is epistatic with stn1, but not with yku70, tel1 or est1 alleles, and is suppressed by Stn1 overexpression. Cdc13 SUMOylation peaks in early to mid S phase, prior to its known Cdk1-mediated phosphorylation, and the two modifications act antagonistically, suggesting that the opposite roles of Cdc13 in telomerase regulation can be separated temporally and regulated by distinct modifications.
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