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
中科院分区:
文献类型:
--
作者:
Ji X;Zhou Y;Pandit S;Huang J;Li H;Lin CY;Xiao R;Burge CB;Fu XD
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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