Architecture of an RNA Polymerase II Transcription Pre-Initiation Complex

作者：Murakami Kenji; Elmlund Hans; Kalisman Nir; Bushnell David A; Adams Christopher M; Azubel Maia; Elmlund Dominika; Levi Kalisman Yael; Liu Xin; Gibbons Brian J; Levitt Michael; Kornberg Roger D^*

来源：Science, 2013, 342(6159): 709-+.

DOI：10.1126/science.1238724

The protein density and arrangement of subunits of a complete, 32-protein, RNA polymerase II (pol II) transcription pre-initiation complex (PIC) were determined by means of cryogenic electron microscopy and a combination of chemical cross-linking and mass spectrometry. The PIC showed a marked division in two parts, one containing all the general transcription factors (GTFs) and the other pol II. Promoter DNA was associated only with the GTFs, suspended above the pol II cleft and not in contact with pol II. This structural principle of the PIC underlies its conversion to a transcriptionally active state; the PIC is poised for the formation of a transcription bubble and descent of the DNA into the pol II cleft.

• 出版日期2013-11-8