SR proteins collaborate with 7SK and promoter-associated nascent RNA to release paused polymerase.

SR proteins collaborate with 7SK and promoter-associated nascent RNA to release paused polymerase.
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DOI:
10.1016/j.cell.2013.04.028
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发表时间:
2013-05-09
期刊:
影响因子:
64.5
通讯作者:
Fu XD
Fu XD
中科院分区:
生物学1区
文献类型:
--
作者:
Ji X;Zhou Y;Pandit S;Huang J;Li H;Lin CY;Xiao R;Burge CB;Fu XD

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RNAP II经常在哺乳动物的基因启动子附近暂停,其向生产性延伸的转变需要主动募集P-TEFb,P-TEFb是RNAP II的细胞周期蛋白依赖性激酶和其他关键转录延伸因子。一部分P-TEFb被隔离在含有7SK非编码RNA的抑制复合物中,但目前尚不清楚P-TEFb在转录激活过程中如何从7SK复合物转换为RNAP II。我们报告说,SRSF 2(也被称为SC 35,SR剪接因子)是组装在基因启动子的7SK复合体的一部分,并在转录暂停释放中发挥直接作用。我们证明了SRSF 2和P-TEFb从7SK复合物中的RNA依赖性协调释放以及通过SRSF 2与启动子相关的新生RNA结合的转录激活。这些发现揭示了一种意想不到的SR蛋白功能,启动子近端新生RNA在基因激活中的作用,以及与HIV达特/TAR激活细胞基因的类似机制。
RNAP II is frequently paused near gene promoters in mammals, and its transition to productive elongation requires active recruitment of P-TEFb, a cyclin-dependent kinase for RNAP II and other key transcription elongation factors. A fraction of P-TEFb is sequestered in an inhibitory complex containing the 7SK noncoding RNA, but it has been unclear how P-TEFb is switched from the 7SK complex to RNAP II during transcription activation. We report that SRSF2 (also known as SC35, an SR-splicing factor) is part of the 7SK complex assembled at gene promoters and plays a direct role in transcription pause release. We demonstrate RNA-dependent, coordinated release of SRSF2 and P-TEFb from the 7SK complex and transcription activation via SRSF2 binding to promoter-associated nascent RNA. These findings reveal an unanticipated SR protein function, a role for promoter-proximal nascent RNA in gene activation, and an analogous mechanism to HIV Tat/TAR for activating cellular genes.
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