The CDC13-STN1-TEN1 complex stimulates Pol α activity by promoting RNA priming and primase-to-polymerase switch.

The CDC13-STN1-TEN1 complex stimulates Pol α activity by promoting RNA priming and primase-to-polymerase switch.
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DOI:
10.1038/ncomms6762
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发表时间:
2014-12-12
影响因子:
16.6
通讯作者:
Hurwitz, Jerard
Hurwitz, Jerard
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Lue, Neal F.;Chan, Jamie;Wright, Woodring E.;Hurwitz, Jerard

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新的证据表明,Cdc13-Stn1-Ten1(Cst),一个类似RPA的单链DNA结合复合体,可能在复制应激条件下对端粒和其他基因组位置的Primase-PolDNAα(PP)活性进行结构性调节。在这里,我们使用从光滑假丝酵母中提取的纯化的复合体来研究CST刺激PP的机制。虽然CST不会增强分离的DNA聚合酶活性,但它显著增强了底物酶活性和底物酶到聚合酶的转换。CST还可以同时缩短嵌合产物中的RNA和延长DNA。STn1是CST中最保守的亚基,是唯一能够刺激PP的亚基。Stn1的N端OB折叠和C端翼螺旋结构域都能与PP复合体的Pol12亚单位结合,并刺激PP活性。我们的发现为PP调节的保守途径提供了机械性的见解,这对基因组稳定性至关重要。
Emerging evidence suggests that Cdc13-Stn1-Ten1 (CST), an RPA-like ssDNA-binding complex, may regulate primase-Pol α (PP) activity at telomeres constitutively, and at other genomic locations under conditions of replication stress. Here we examine the mechanisms of PP stimulation by CST using purified complexes derived from Candida glabrata. While CST does not enhance isolated DNA polymerase activity, it substantially augments both primase activity and primase-to-polymerase switching. CST also simultaneously shortens the RNA and lengthens the DNA in the chimeric products. Stn1, the most conserved subunit of CST, is alone capable of PP stimulation. Both the N-terminal OB fold and the C-terminal winged-helix domains of Stn1 can bind to the Pol12 subunit of the PP complex, and stimulate PP activity. Our findings provide mechanistic insights on a well-conserved pathway of PP regulation that is critical for genome stability.
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发表时间: 2009-11-13
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