Molecular insight into RNA polymerase I promoter recognition and promoter melting
RNA polymerase I (Pol I) assembles with core factor (CF) and Rrn3 on the rDNA core promoter for transcription initiation. Here, we report cryo-EM structures of closed, intermediate and open Pol I initiation complexes from 2.7 to 3.7 Å resolution to visualize Pol I promoter melting and to structural...
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| Hauptverfasser: | , , , , , , |
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| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
| Veröffentlicht: |
5 Dec 2019
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| In: |
Nature Communications
Year: 2019, Jahrgang: 10 |
| ISSN: | 2041-1723 |
| DOI: | 10.1038/s41467-019-13510-w |
| Online-Zugang: | Verlag, Volltext: https://doi.org/10.1038/s41467-019-13510-w Verlag, Volltext: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6895186/ 
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| Verfasserangaben: | Yashar Sadian, Florence Baudin, Lucas Tafur, Brice Murciano, Rene Wetzel, Felix Weis, Christoph W. Müller |
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| 520 | |a RNA polymerase I (Pol I) assembles with core factor (CF) and Rrn3 on the rDNA core promoter for transcription initiation. Here, we report cryo-EM structures of closed, intermediate and open Pol I initiation complexes from 2.7 to 3.7 Å resolution to visualize Pol I promoter melting and to structurally and biochemically characterize the recognition mechanism of Pol I promoter DNA. In the closed complex, double-stranded DNA runs outside the DNA-binding cleft. Rotation of CF and upstream DNA with respect to Pol I and Rrn3 results in the spontaneous loading and opening of the promoter followed by cleft closure and positioning of the Pol I A49 tandem winged helix domain (tWH) onto DNA. Conformational rearrangement of A49 tWH leads to a clash with Rrn3 to initiate complex disassembly and promoter escape. Comprehensive insight into the Pol I transcription initiation cycle allows comparisons with promoter opening by Pol II and Pol III., RNA polymerase I (Pol I) catalyses the transcription of pre-ribosomal RNA and for transcription initiation Pol I assembles with core factor and Rrn3 on the rDNA core promoter. Here the authors provide insights into the molecular mechanism of promoter opening by Pol I by determining the cryo-EM structures of two closed, two intermediate and two open Pol I pre-initiation complexes. | ||
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