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-Structure paper
タイトル | Structural Basis of RNA Polymerase I Transcription Initiation. |
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ジャーナル・号・ページ | Cell, Vol. 169, Issue 1, Page 120-131.e22, Year 2017 |
掲載日 | 2017年3月23日 |
![]() | Christoph Engel / Tobias Gubbey / Simon Neyer / Sarah Sainsbury / Christiane Oberthuer / Carlo Baejen / Carrie Bernecky / Patrick Cramer / ![]() |
PubMed 要旨 | Transcription initiation at the ribosomal RNA promoter requires RNA polymerase (Pol) I and the initiation factors Rrn3 and core factor (CF). Here, we combine X-ray crystallography and cryo-electron ...Transcription initiation at the ribosomal RNA promoter requires RNA polymerase (Pol) I and the initiation factors Rrn3 and core factor (CF). Here, we combine X-ray crystallography and cryo-electron microscopy (cryo-EM) to obtain a molecular model for basal Pol I initiation. The three-subunit CF binds upstream promoter DNA, docks to the Pol I-Rrn3 complex, and loads DNA into the expanded active center cleft of the polymerase. DNA unwinding between the Pol I protrusion and clamp domains enables cleft contraction, resulting in an active Pol I conformation and RNA synthesis. Comparison with the Pol II system suggests that promoter specificity relies on a distinct "bendability" and "meltability" of the promoter sequence that enables contacts between initiation factors, DNA, and polymerase. |
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手法 | EM (単粒子) / X線回折 |
解像度 | 3.2 - 7.7 Å |
構造データ | EMDB-3590, PDB-5n5y: EMDB-3591, PDB-5n5z: EMDB-3592, PDB-5n60: EMDB-3594: RNA polymerase I initially transcribing complex with visible tandem Winged Helix domain ![]() PDB-5o7x: |
化合物 | ![]() ChemComp-ZN: ![]() ChemComp-SO4: ![]() ChemComp-MG: |
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