TRANSCRIPTION / RNA POLYMERASE I INITIATION / CORE FACTOR
機能・相同性
機能・相同性情報
RNA polymerase I transcription regulatory region sequence-specific DNA binding / RNA polymerase I core factor complex / RNA polymerase I general transcription initiation factor activity / RNA polymerase I general transcription initiation factor binding / RNA polymerase I core promoter sequence-specific DNA binding / RNA Polymerase I Promoter Escape / nucleolar large rRNA transcription by RNA polymerase I / transcription initiation at RNA polymerase I promoter / TBP-class protein binding / nucleolus ...RNA polymerase I transcription regulatory region sequence-specific DNA binding / RNA polymerase I core factor complex / RNA polymerase I general transcription initiation factor activity / RNA polymerase I general transcription initiation factor binding / RNA polymerase I core promoter sequence-specific DNA binding / RNA Polymerase I Promoter Escape / nucleolar large rRNA transcription by RNA polymerase I / transcription initiation at RNA polymerase I promoter / TBP-class protein binding / nucleolus / zinc ion binding / nucleus / cytoplasm 類似検索 - 分子機能
ジャーナル: Cell / 年: 2017 タイトル: Structural Basis of RNA Polymerase I Transcription Initiation. 著者: Christoph Engel / Tobias Gubbey / Simon Neyer / Sarah Sainsbury / Christiane Oberthuer / Carlo Baejen / Carrie Bernecky / Patrick Cramer / 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.