Structure of the human telomeric Stn1-Ten1 capping complex.

Structure of the human telomeric Stn1-Ten1 capping complex.
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人端粒STN1-TEN1封码复合物的结构。

DOI:
10.1371/journal.pone.0066756
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发表时间:
2013
期刊:
影响因子:
3.7
通讯作者:
Skordalakes E
Skordalakes E
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Bryan C;Rice C;Harkisheimer M;Schultz DC;Skordalakes E

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2009年酵母CST人类同源物的鉴定对我们理解高等真核生物端粒盖顶机制提出了新的挑战。本文展示的人类Stn1-Ten1 (hStn1- ten1)复合体的高分辨率结构显示,hStn1由OB结构域和串联c端wHTH基序组成,而hTen1由单个OB折叠组成。OB结构域之间的接触促进了复合体的形成,该复合体与复制蛋白a (RPA)和酵母Stn1-Ten1 (Ten1)复合体惊人地相似。hStn1- ten1复合物表现出主要依赖于hStn1的非特异性单链DNA活性。表达与hTen1二聚化缺陷的hStn1突变体的细胞显示端粒延长,端粒缺陷与端粒脱帽相关,这表明hCST的端粒功能依赖于hTen1。综上所述的数据表明,hStn1-Ten1亚复合物的结构在物种间是保守的。基于细胞的实验表明,hTen1对hCST的端粒功能至关重要,无论是端粒保护还是端粒酶功能的下调。
The identification of the human homologue of the yeast CST in 2009 posed a new challenge in our understanding of the mechanism of telomere capping in higher eukaryotes. The high-resolution structure of the human Stn1-Ten1 (hStn1-Ten1) complex presented here reveals that hStn1 consists of an OB domain and tandem C-terminal wHTH motifs, while hTen1 consists of a single OB fold. Contacts between the OB domains facilitate formation of a complex that is strikingly similar to the replication protein A (RPA) and yeast Stn1-Ten1 (Ten1) complexes. The hStn1-Ten1 complex exhibits non-specific single-stranded DNA activity that is primarily dependent on hStn1. Cells expressing hStn1 mutants defective for dimerization with hTen1 display elongated telomeres and telomere defects associated with telomere uncapping, suggesting that the telomeric function of hCST is hTen1 dependent. Taken together the data presented here show that the structure of the hStn1-Ten1 subcomplex is conserved across species. Cell based assays indicate that hTen1 is critical for the telomeric function of hCST, both in telomere protection and downregulation of telomerase function.
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期刊: Science (New York, N.Y.)
影响因子: --
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期刊: CELL RESEARCH
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