TERRA RNA binding to TRF2 facilitates heterochromatin formation and ORC recruitment at telomeres.

TERRA RNA binding to TRF2 facilitates heterochromatin formation and ORC recruitment at telomeres.
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DOI:
10.1016/j.molcel.2009.06.025
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发表时间:
2009-08-28
期刊:
影响因子:
16
通讯作者:
Lieberman, Paul M.
Lieberman, Paul M.
中科院分区:
生物学1区
文献类型:
--
作者:
Deng, Zhong;Norseen, Julie;Wiedmer, Andreas;Riethman, Harold;Lieberman, Paul M.

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端粒重复编码RNA(简称TERRA)已被确定为酵母和哺乳动物端粒的潜在成分。我们在这里展示了TERRA RNA与一些端粒相关蛋白相互作用,包括端粒重复因子1 (TRF1)和2 (TRF2)、起源识别复合体(ORC)亚基、异染色质蛋白1 (HP1)、组蛋白H3三甲基K9 (H3 K9me3)和DNA损伤感知途径的成员。TERRA的siRNA缺失导致端粒功能障碍诱导的病灶(TIF)增加,中期端粒畸变,以及端粒重复DNA组蛋白H3 K9me3和ORC的缺失。先前的研究发现TRF2氨基末端GAR结构域将ORC招募到端粒。我们现在表明,TERRA RNA可以直接与TRF2、GAR和ORC1相互作用,形成稳定的三元配合物。我们得出结论,TERRA促进TRF2与ORC的相互作用,并在端粒结构维持和异染色质形成中发挥核心作用。
Telomere-repeat encoding RNA (referred to as TERRA) has been identified as a potential component of yeast and mammalian telomeres. We show here that TERRA RNA interacts with several telomere-associated proteins, including telomere repeat factors 1 (TRF1) and 2 (TRF2), subunits of the Origin Recognition Complex (ORC), heterochromatin protein 1 (HP1), histone H3 trimethyl K9 (H3 K9me3), and members of the DNA damage sensing pathway. siRNA depletion of TERRA caused an increase in telomere dysfunction-induced foci (TIF), aberrations in metaphase telomeres, and a loss of histone H3 K9me3 and ORC at telomere repeat DNA. Previous studies found that TRF2 amino-terminal GAR domain recruited ORC to telomeres. We now show that TERRA RNA can interact directly with the TRF2 GAR and ORC1 to form a stable ternary complex. We conclude that TERRA facilitates TRF2 interaction with ORC and plays a central role in telomere structural maintenance and heterochromatin formation.
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