Regulatory interactions between RNA and polycomb repressive complex 2.

Regulatory interactions between RNA and polycomb repressive complex 2.
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DOI:
10.1016/j.molcel.2014.05.009
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发表时间:
2014-07-17
期刊:
影响因子:
16
通讯作者:
Lee, Jeannie T.
Lee, Jeannie T.
中科院分区:
生物学1区
文献类型:
--
作者:
Cifuentes-Rojas, Catherine;Hernandez, Alfredo J.;Sarma, Kavitha;Lee, Jeannie T.

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多梳抑制复合物2(PRC 2)是一种定位于数千个哺乳动物基因的组蛋白甲基转移酶。尽管PRC 2对人类疾病和药物靶点很重要,但它是如何被招募的仍不清楚。一种模型调用顺式调节RNA。在这里,我们生化和功能探针PRC 2的识别RNA使用X-失活模型。我们观察到令人惊讶的高分辨能力。虽然SUZ 12和JARID 2亚基可以结合RNA,但EZH 2具有最高的亲和力,并且有点混杂。EED调节EZH 2对RNA的亲和力,使PRC 2-RNA相互作用具有更大的特异性。有趣的是,虽然RNA对靶向至关重要,但RNA抑制了EZH 2的催化活性。JARID 2减弱PRC 2与RNA的结合并解除催化抑制。我们认为RNA引导PRC 2到达其靶点,但抑制其酶活性,直到PRC 2与染色质上的JARID 2结合。我们的研究提供了RNA和PRC 2在染色质界面的调节相互作用的分子观点。
Polycomb repressive complex 2 (PRC2) is a histone methyltransferase that is localized to thousands of mammalian genes. Though important to human disease and as a drug target, how PRC2 is recruited remains unclear. One model invokes cis-regulatory RNA. Herein, we biochemically and functionally probe PRC2’s recognition of RNA using the X-inactivation model. We observe surprisingly high discriminatory capabilities. While SUZ12 and JARID2 subunits can bind RNA, EZH2 has highest affinity and is somewhat promiscuous. EED regulates the affinity of EZH2 for RNA, lending greater specificity to PRC2-RNA interactions. Intriguingly, while RNA is crucial for targeting, RNA inhibits EZH2’s catalytic activity. JARID2 weakens PRC2’s binding to RNA and relieves catalytic inhibition. We propose that RNA guides PRC2 to its target, but inhibits its enzymatic activity until PRC2 associates with JARID2 on chromatin. Our study provides a molecular view of regulatory interactions between RNA and PRC2 at the chromatin interface.
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