Structure of Telomerase with Telomeric DNA.

Structure of Telomerase with Telomeric DNA.
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用端粒DNA的端粒酶结构。

DOI:
10.1016/j.cell.2018.04.038
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发表时间:
2018-05-17
期刊:
影响因子:
64.5
通讯作者:
Feigon J
Feigon J
中科院分区:
生物学1区
文献类型:
--
作者:
Jiang J;Wang Y;Sušac L;Chan H;Basu R;Zhou ZH;Feigon J

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端粒酶是一种 RNA-蛋白质复合物 (RNP),它使用端粒酶逆转录酶 (TERT) 和包含完整模板的端粒酶 RNA (TER) 在染色体 3' 端延伸端粒 DNA。它的活性是人类健康的关键决定因素,影响衰老、癌症和干细胞更新。端粒酶原子模型的缺乏,特别是与 DNA 结合的端粒酶原子模型的缺乏,限制了我们对端粒 DNA 重复合成机制的理解。我们报道了与端粒 DNA 结合的活性四膜虫端粒酶的 4.8Å 分辨率冷冻电子显微镜结构。催化核心是 TERT 和 TER 的错综复杂的连锁结构,包括以前结构上未表征的 TERT 结构域,该结构域与 TEN 结构域相互作用,以物理方式包围 TER 并调节活性。端粒酶催化核心的完整结构及其与端粒 DNA 从模板到端粒相互作用 p50-TEB 复合物的相互作用,为端粒酶组装和催化循环提供了意想不到的见解,并为逆转录酶 RNP 提供了新范例。
Telomerase is an RNA-protein complex (RNP) that extends telomeric DNA at the 3’-ends of chromosomes using its telomerase reverse transcriptase (TERT) and integral template-containing telomerase RNA (TER). Its activity is a critical determinant of human health, affecting aging, cancer, and stem cell renewal. Lack of atomic models of telomerase, particularly one with DNA bound, has limited our mechanistic understanding of telomeric DNA repeat synthesis. We report the 4.8Å resolution cryo-electron microscopy structure of active Tetrahymena telomerase bound to telomeric DNA. The catalytic core is an intricately interlocked structure of TERT and TER, including a previously structurally uncharacterized TERT domain that interacts with TEN domain to physically enclose TER and regulate activity. This complete structure of a telomerase catalytic core and its interactions with telomeric DNA from the template to telomere-interacting p50-TEB complex provides unanticipated insights into telomerase assembly and catalytic cycle and a new paradigm for a reverse transcriptase RNP.
端粒DNA合成过程中端粒酶RNA定位的RNA手风琴模型。
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