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- EMDB-7998: RNA Pol II(G) focus refinement -

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Basic information

Entry
Database: EMDB / ID: EMD-7998
TitleRNA Pol II(G) focus refinement
Map data
SamplehPolII_Gdown1
Biological speciesHomo sapiens (human)
Methodsingle particle reconstruction / cryo EM / Resolution: 4.3 Å
AuthorsYu X / Jishage M
CitationJournal: Nat. Struct. Mol. Biol. / Year: 2018
Title: Architecture of Pol II(G) and molecular mechanism of transcription regulation by Gdown1.
Authors: Miki Jishage / Xiaodi Yu / Yi Shi / Sai J Ganesan / Wei-Yi Chen / Andrej Sali / Brian T Chait / Francisco J Asturias / Robert G Roeder /
Abstract: Tight binding of Gdown1 represses RNA polymerase II (Pol II) function in a manner that is reversed by Mediator, but the structural basis of these processes is unclear. Although Gdown1 is ...Tight binding of Gdown1 represses RNA polymerase II (Pol II) function in a manner that is reversed by Mediator, but the structural basis of these processes is unclear. Although Gdown1 is intrinsically disordered, its Pol II interacting domains were localized and shown to occlude transcription factor IIF (TFIIF) and transcription factor IIB (TFIIB) binding by perfect positioning on their Pol II interaction sites. Robust binding of Gdown1 to Pol II is established by cooperative interactions of a strong Pol II binding region and two weaker binding modulatory regions, thus providing a mechanism both for tight Pol II binding and transcription inhibition and for its reversal. In support of a physiological function for Gdown1 in transcription repression, Gdown1 co-localizes with Pol II in transcriptionally silent nuclei of early Drosophila embryos but re-localizes to the cytoplasm during zygotic genome activation. Our study reveals a self-inactivation through Gdown1 binding as a unique mode of repression in Pol II function.
DateDeposition: Jun 11, 2018 / Header (metadata) release: Jul 25, 2018 / Map release: Jun 12, 2019 / Update: Jun 12, 2019

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Structure visualization

Movie
  • Surface view with section colored by density value
  • Surface level: 0.03
  • Imaged by UCSF Chimera
  • Download
  • Surface view colored by radius
  • Surface level: 0.03
  • 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_7998.map.gz / Format: CCP4 / Size: 42.9 MB / Type: IMAGE STORED AS FLOATING POINT NUMBER (4 BYTES)
Projections & slices

Image control

Size
Brightness
Contrast
Others
AxesZ (Sec.)Y (Row.)X (Col.)
1.31 Å/pix.
x 224 pix.
= 293.44 Å
1.31 Å/pix.
x 224 pix.
= 293.44 Å
1.31 Å/pix.
x 224 pix.
= 293.44 Å

Surface

Projections

Slices (1/3)

Slices (1/2)

Slices (2/3)

Images are generated by Spider.

Voxel sizeX=Y=Z: 1.31 Å
Density
Contour LevelBy AUTHOR: 0.03 / Movie #1: 0.03
Minimum - Maximum-0.0970552 - 0.17694992
Average (Standard dev.)0.00069641176 (±0.0059148353)
SymmetrySpace group: 1
Details

EMDB XML:

Map geometry
Axis orderXYZ
Origin000
Dimensions224224224
Spacing224224224
CellA=B=C: 293.44 Å
α=β=γ: 90.0 °

CCP4 map header:

modeImage stored as Reals
Å/pix. X/Y/Z1.311.311.31
M x/y/z224224224
origin x/y/z0.0000.0000.000
length x/y/z293.440293.440293.440
α/β/γ90.00090.00090.000
start NX/NY/NZ000
NX/NY/NZ192192192
MAP C/R/S123
start NC/NR/NS000
NC/NR/NS224224224
D min/max/mean-0.0970.1770.001

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Supplemental data

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Sample components

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Entire hPolII_Gdown1

EntireName: hPolII_Gdown1 / Number of components: 1

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Component #1: protein, hPolII_Gdown1

ProteinName: hPolII_Gdown1 / Recombinant expression: No
SourceSpecies: Homo sapiens (human)

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Experimental details

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Sample preparation

SpecimenSpecimen state: Cell / Method: cryo EM
Sample solutionpH: 7.5
VitrificationCryogen name: ETHANE

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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: 40 e/Å2 / Illumination mode: FLOOD BEAM
LensCs: 2.7 mm / Imaging 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: 35026
3D reconstructionResolution: 4.3 Å / Resolution method: FSC 0.143 CUT-OFF

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