TRF2 promotes dynamic and stepwise looping of POT1 bound telomeric overhang.

TRF2 promotes dynamic and stepwise looping of POT1 bound telomeric overhang.
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TRF2促进POT1结合的端粒突出端的动态和逐步成环。

DOI:
10.1093/nar/gkab1123
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发表时间:
2021-12-02
影响因子:
14.9
通讯作者:
Myong S
Myong S
中科院分区:
生物学2区
文献类型:
--
作者:
Paul T;Liou W;Cai X;Opresko PL;Myong S

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人类端粒受到保护素蛋白的保护,但端粒如何维持动态结构仍然难以捉摸。在这里,我们报告了POT1在传递端粒突出的构象动力学方面的意外活性,即使在单体水平上也是如此。值得注意的是,当TRF2与端粒双链结合时,这种POT1诱导的悬垂动力学大大增强。有趣的是,TRF2,而不是TRF2POT1-ΔB,将POT1结合的突出部分招募到端粒DS/SS连接处,并诱导沿着端粒双链的轴向上和向下离散的步进式移动。无论POT1结合的悬垂长度如何,都观察到了相同的步骤,这表明了由TRF2和POT1协调的严格调控的构象动力学。物理连接POT1和TRF2的TPP1和TIN2作用于沿着端粒双链的轴线产生平滑运动。我们的结果提示了一种合理的机制,在这种机制中,端粒保持着由保护素协调的动态结构。
Human telomeres are protected by shelterin proteins, but how telomeres maintain a dynamic structure remains elusive. Here, we report an unexpected activity of POT1 in imparting conformational dynamics of the telomere overhang, even at a monomer level. Strikingly, such POT1-induced overhang dynamics is greatly enhanced when TRF2 engages with the telomere duplex. Interestingly, TRF2, but not TRF2ΔB, recruits POT1-bound overhangs to the telomere ds/ss junction and induces a discrete stepwise movement up and down the axis of telomere duplex. The same steps are observed regardless of the length of the POT1-bound overhang, suggesting a tightly regulated conformational dynamic coordinated by TRF2 and POT1. TPP1 and TIN2 which physically connect POT1 and TRF2 act to generate a smooth movement along the axis of the telomere duplex. Our results suggest a plausible mechanism wherein telomeres maintain a dynamic structure orchestrated by shelterin.
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