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- EMDB-10019: RNA Polymerase I Open Complex conformation 2 focused refinement on CF -

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Basic information

Entry
Database: EMDB / ID: EMD-10019
TitleRNA Polymerase I Open Complex conformation 2 focused refinement on CF
Map data
SampleRNA Polymerase I Open Complex conformation 2 focused refinement on CF:
RNA Polymerase I / DNA / transcription initiation factors
Biological speciesSaccharomyces cerevisiae (baker's yeast) / synthetic construct (others)
Methodsingle particle reconstruction / cryo EM / Resolution: 3 Å
AuthorsMueller CW / Sadian Y
Funding support1 items
OrganizationGrant numberCountry
European Research CouncilERC-2013-AdG340964-POL1PIC
CitationJournal: Nat Commun / Year: 2019
Title: Molecular insight into RNA polymerase I promoter recognition and promoter melting.
Authors: Yashar Sadian / Florence Baudin / Lucas Tafur / Brice Murciano / Rene Wetzel / Felix Weis / Christoph W Müller /
Abstract: 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 ...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.
History
DepositionJun 3, 2019-
Header (metadata) releaseApr 22, 2020-
Map releaseApr 22, 2020-
UpdateApr 22, 2020-
Current statusApr 22, 2020Processing site: PDBe / Status: Released

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Structure visualization

Movie
  • Surface view with section colored by density value
  • Surface level: 0.04
  • Imaged by UCSF Chimera
  • Download
  • Surface view colored by radius
  • Surface level: 0.04
  • Imaged by UCSF Chimera
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Movie viewer
Structure viewerEM map:
SurfViewMolmilJmol/JSmol
Supplemental images

Downloads & links

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Map

FileDownload / File: emd_10019.map.gz / Format: CCP4 / Size: 91.1 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Projections & slices

Image control

Size
Brightness
Contrast
Others
AxesZ (Sec.)Y (Row.)X (Col.)
1.32 Å/pix.
x 288 pix.
= 380.16 Å
1.32 Å/pix.
x 288 pix.
= 380.16 Å
1.32 Å/pix.
x 288 pix.
= 380.16 Å

Surface

Projections

Slices (1/3)

Slices (1/2)

Slices (2/3)

Images are generated by Spider.

Voxel sizeX=Y=Z: 1.32 Å
Density
Contour LevelBy AUTHOR: 0.04 / Movie #1: 0.04
Minimum - Maximum-0.2007255 - 0.38596818
Average (Standard dev.)0.0001728115 (±0.005234903)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions288288288
Spacing288288288
CellA=B=C: 380.16 Å
α=β=γ: 90.0 °

CCP4 map header:

modeImage stored as Reals
Å/pix. X/Y/Z1.321.321.32
M x/y/z288288288
origin x/y/z0.0000.0000.000
length x/y/z380.160380.160380.160
α/β/γ90.00090.00090.000
MAP C/R/S123
start NC/NR/NS000
NC/NR/NS288288288
D min/max/mean-0.2010.3860.000

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Supplemental data

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Sample components

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Entire RNA Polymerase I Open Complex conformation 2 focused refinement on CF

EntireName: RNA Polymerase I Open Complex conformation 2 focused refinement on CF
Number of components: 4

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Component #1: protein, RNA Polymerase I Open Complex conformation 2 focused ref...

ProteinName: RNA Polymerase I Open Complex conformation 2 focused refinement on CF
Recombinant expression: No

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Component #2: protein, RNA Polymerase I

ProteinName: RNA Polymerase I / Recombinant expression: No
SourceSpecies: Saccharomyces cerevisiae (baker's yeast)

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Component #3: protein, DNA

ProteinName: DNA / Recombinant expression: No
SourceSpecies: synthetic construct (others)
Source (engineered)Expression System: synthetic construct (others)

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Component #4: protein, transcription initiation factors

ProteinName: transcription initiation factors / Recombinant expression: No
SourceSpecies: Saccharomyces cerevisiae (baker's yeast)
Source (engineered)Expression System: Escherichia coli (E. coli)

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Experimental details

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Sample preparation

SpecimenSpecimen state: Particle / Method: cryo EM
Sample solutionpH: 7.5
VitrificationInstrument: FEI VITROBOT MARK IV / Cryogen name: ETHANE / Temperature: 4 K / Humidity: 100 %

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Electron microscopy imaging

Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company
ImagingMicroscope: FEI TITAN KRIOS
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Electron dose: 1.57175 e/Å2 / Illumination mode: FLOOD BEAM
LensImaging mode: BRIGHT FIELD
Specimen HolderModel: OTHER
CameraDetector: GATAN K2 SUMMIT (4k x 4k)

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Image processing

ProcessingMethod: single particle reconstruction / Number of projections: 59963
3D reconstructionResolution: 3 Å / Resolution method: FSC 0.143 CUT-OFF

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