Structure of a Complete Mediator-RNA Polymerase II Pre-Initiation Complex.
Structure of a Complete Mediator-RNA Polymerase II Pre-Initiation Complex.
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DOI:
10.1016/j.cell.2016.08.050
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发表时间:
2016-09-08
期刊:
影响因子:
64.5
通讯作者:
Kornberg RD
中科院分区:
文献类型:
--
作者:
Robinson PJ;Trnka MJ;Bushnell DA;Davis RE;Mattei PJ;Burlingame AL;Kornberg RD
A complete, 52-protein, 2.5 million Dalton, Mediator-RNA polymerase II pre-initiation complex (Med-PIC) was assembled and analyzed by cryo-electron microscopy and by chemical cross-linking and mass spectrometry. The resulting complete Med-PIC structure reveals two components of functional significance, absent from previous structures, a protein kinase complex and the Mediator-activator interaction region. It thereby shows how the kinase and its target, the C-terminal domain of the polymerase, control Med-PIC interaction and transcription. Visualizing a complete Mediator-RNA polymerase II pre-initiation complex highlights the importance of the pol II C-terminal domain (CTD) on complex formation, suggesting a model of the CTD choreography during transcription initiation.
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