Structural Insights into Yeast Telomerase Recruitment to Telomeres.

Structural Insights into Yeast Telomerase Recruitment to Telomeres.
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酵母端粒酶招募到端粒的结构见解。

DOI:
10.1016/j.cell.2017.12.008
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发表时间:
2018-01-11
期刊:
影响因子:
64.5
通讯作者:
Lei M
Lei M
中科院分区:
生物学1区
文献类型:
--
作者:
Chen H;Xue J;Churikov D;Hass EP;Shi S;Lemon LD;Luciano P;Bertuch AA;Zappulla DC;Géli V;Wu J;Lei M

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端粒酶维持从人类到酵母的染色体末端。酵母端粒酶通过其Ku和Est1亚基分别与端粒酶RNA (TLC1)和端粒蛋白Sir4和Cdc13独立相互作用募集到端粒。然而,组成端粒酶募集途径的分子结构仍然未知。在这里,我们报道了Ku异二聚体和Est1与它们的关键结合伙伴络合的晶体结构。两个主要发现是:(1)Ku以一种独特但相关的方式与端粒酶RNA结合;(2)Est1使用两个独立的袋来结合Cdc13的不同基序。Est1的n端cdc13结合位点与TLC1-Ku-Sir4途径合作募集端粒酶,而c端接口在体外结合Est1时是必不可少的,但在体内维持端粒是必不可少的。总的来说,我们的结果整合了以前的模型,并提供了关于端粒生物学的基本有价值的结构信息。
Telomerase maintains chromosome ends from humans to yeasts. Recruitment of yeast telomerase to telomeres occurs through its Ku and Est1 subunits, via independent interactions with telomerase RNA (TLC1) and telomeric proteins Sir4 and Cdc13, respectively. However, the structures of the molecules comprising these telomerase-recruiting pathways remain unknown. Here, we report crystal structures of the Ku heterodimer and Est1 complexed with their key binding partners. Two major findings are: (1) Ku specifically binds to telomerase RNA in a distinct, yet related, manner to how it binds DNA and (2) Est1 employs two separate pockets to bind distinct motifs of Cdc13. The N-terminal Cdc13-binding site of Est1 cooperates with the TLC1-Ku-Sir4 pathway for telomerase recruitment, whereas the C-terminal interface is dispensable for binding Est1 in vitro, yet is nevertheless essential for telomere maintenance in vivo. Overall, our results integrate previous models and provide fundamentally valuable structural information regarding telomere biology.
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