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- PDB-9qeb: CryoEM structure of transcribing RNA polymerase II elongation complex -

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Basic information

Entry
Database: PDB / ID: 9qeb
TitleCryoEM structure of transcribing RNA polymerase II elongation complex
Components
  • (DNA (44-MER)) x 2
  • (DNA-directed RNA polymerase II subunit ...) x 7
  • (DNA-directed RNA polymerases I, II, and III subunit ...) x 5
  • RNA (5'-R(P*AP*UP*CP*GP*AP*GP*AP*GP*G)-3')
KeywordsTRANSCRIPTION / CryoEM / RNA / Polymerase II
Function / homology
Function and homology information


RPB4-RPB7 complex / nuclear-transcribed mRNA catabolic process, deadenylation-dependent decay / RNA Polymerase I Transcription Initiation / Processing of Capped Intron-Containing Pre-mRNA / RNA Polymerase III Transcription Initiation From Type 2 Promoter / RNA Pol II CTD phosphorylation and interaction with CE / Formation of the Early Elongation Complex / mRNA Capping / Formation of TC-NER Pre-Incision Complex / RNA polymerase II transcribes snRNA genes ...RPB4-RPB7 complex / nuclear-transcribed mRNA catabolic process, deadenylation-dependent decay / RNA Polymerase I Transcription Initiation / Processing of Capped Intron-Containing Pre-mRNA / RNA Polymerase III Transcription Initiation From Type 2 Promoter / RNA Pol II CTD phosphorylation and interaction with CE / Formation of the Early Elongation Complex / mRNA Capping / Formation of TC-NER Pre-Incision Complex / RNA polymerase II transcribes snRNA genes / Estrogen-dependent gene expression / RNA Polymerase I Promoter Escape / TP53 Regulates Transcription of DNA Repair Genes / RNA Polymerase II Promoter Escape / RNA Polymerase II Transcription Pre-Initiation And Promoter Opening / RNA Polymerase II Transcription Initiation / RNA Polymerase II Transcription Initiation And Promoter Clearance / RNA Polymerase II Pre-transcription Events / RNA-templated transcription / positive regulation of nuclear-transcribed mRNA poly(A) tail shortening / termination of RNA polymerase II transcription / Gap-filling DNA repair synthesis and ligation in TC-NER / termination of RNA polymerase I transcription / Dual incision in TC-NER / transcription by RNA polymerase III / maintenance of transcriptional fidelity during transcription elongation by RNA polymerase II / nucleolar large rRNA transcription by RNA polymerase I / transcription initiation at RNA polymerase I promoter / positive regulation of translational initiation / nuclear-transcribed mRNA catabolic process / termination of RNA polymerase III transcription / transcription initiation at RNA polymerase III promoter / RNA polymerase I complex / RNA polymerase III complex / RNA polymerase II, core complex / tRNA transcription by RNA polymerase III / transcription by RNA polymerase I / transcription elongation by RNA polymerase I / translesion synthesis / transcription-coupled nucleotide-excision repair / translation initiation factor binding / DNA-templated transcription initiation / transcription initiation at RNA polymerase II promoter / P-body / transcription elongation by RNA polymerase II / mRNA transcription by RNA polymerase II / ribonucleoside binding / mRNA processing / DNA-directed RNA polymerase / cytoplasmic stress granule / DNA-directed RNA polymerase activity / transcription by RNA polymerase II / peroxisome / single-stranded DNA binding / ribosome biogenesis / nucleic acid binding / protein dimerization activity / single-stranded RNA binding / nucleotide binding / mRNA binding / nucleolus / mitochondrion / DNA binding / nucleoplasm / zinc ion binding / metal ion binding / nucleus / cytoplasm
Similarity search - Function
DNA-directed RNA polymerase II subunit Rpb4-like / RNA polymerase Rpb4/RPC9, core / RNA polymerase Rpb1 C-terminal repeat / DNA-directed RNA-polymerase II subunit / RNA polymerase II, heptapeptide repeat, eukaryotic / Eukaryotic RNA polymerase II heptapeptide repeat. / RNA polymerase Rpb1, domain 6 / RNA polymerase Rpb1, domain 6 / RNA polymerase Rpb1, domain 7 / RNA polymerase Rpb1, domain 7 superfamily ...DNA-directed RNA polymerase II subunit Rpb4-like / RNA polymerase Rpb4/RPC9, core / RNA polymerase Rpb1 C-terminal repeat / DNA-directed RNA-polymerase II subunit / RNA polymerase II, heptapeptide repeat, eukaryotic / Eukaryotic RNA polymerase II heptapeptide repeat. / RNA polymerase Rpb1, domain 6 / RNA polymerase Rpb1, domain 6 / RNA polymerase Rpb1, domain 7 / RNA polymerase Rpb1, domain 7 superfamily / RNA polymerase Rpb1, domain 7 / Rpb4/RPC9 superfamily / Pol II subunit B9, C-terminal zinc ribbon / RNA polymerase RBP11 / RNA polymerase subunit Rpb4/RPC9 / RNA polymerase Rpb4 / Zinc finger TFIIS-type signature. / RNA polymerase Rpb7-like , N-terminal / RNA polymerase Rpb7-like, N-terminal domain superfamily / RNA polymerase subunit Rpb7-like / SHS2 domain found in N terminus of Rpb7p/Rpc25p/MJ0397 / RNA polymerase Rpb2, domain 5 / RNA polymerase Rpb2, domain 5 / HRDC-like superfamily / RNA polymerase Rpb2, domain 4 / RNA polymerase Rpb2, domain 4 / DNA-directed RNA polymerase, M/15kDa subunit / RNA polymerases M/15 Kd subunit / RNA polymerase subunit 9 / DNA-directed RNA polymerase M, 15kDa subunit, conserved site / RNA polymerases M / 15 Kd subunits signature. / DNA-directed RNA polymerase subunit/transcription factor S / : / RNA polymerase, Rpb8 / DNA-directed RNA polymerases I, II, and III subunit RPABC4 / RNA polymerase Rpb8 / RNA polymerase subunit 8 / RNA polymerase, Rpb5, N-terminal / RNA polymerase Rpb5, N-terminal domain superfamily / RNA polymerase Rpb5, N-terminal domain / DNA-directed RNA polymerase, subunit RPB6 / DNA-directed RNA polymerase subunit RPABC5/Rpb10 / RNA polymerases, subunit N, zinc binding site / RNA polymerase subunit RPB10 / RNA polymerases N / 8 kDa subunit / RNA polymerases N / 8 Kd subunits signature. / RNA polymerase, subunit H/Rpb5, conserved site / RNA polymerases H / 23 Kd subunits signature. / DNA directed RNA polymerase, 7 kDa subunit / RNA polymerase archaeal subunit P/eukaryotic subunit RPABC4 / RNA polymerase subunit CX / DNA-directed RNA polymerase, 30-40kDa subunit, conserved site / DNA-directed RNA polymerase subunit Rpo3/Rpb3/RPAC1 / RNA polymerases D / 30 to 40 Kd subunits signature. / DNA-directed RNA polymerase Rpb11, 13-16kDa subunit, conserved site / DNA-directed RNA polymerase subunit Rpo11 / RNA polymerases L / 13 to 16 Kd subunits signature. / RNA polymerase subunit RPABC4/transcription elongation factor Spt4 / Zinc finger, TFIIS-type / Transcription factor S-II (TFIIS) / Zinc finger TFIIS-type profile. / C2C2 Zinc finger / DNA-directed RNA polymerase, RBP11-like dimerisation domain / RNA polymerase Rpb3/Rpb11 dimerisation domain / RNA polymerase, subunit H/Rpb5 C-terminal / DNA-directed RNA polymerase subunit Rpo5/Rpb5 / RPB5-like RNA polymerase subunit superfamily / RNA polymerase Rpb5, C-terminal domain / Archaeal Rpo6/eukaryotic RPB6 RNA polymerase subunit / DNA-directed RNA polymerase, 14-18kDa subunit, conserved site / RNA polymerases K / 14 to 18 Kd subunits signature. / Ribosomal protein S1-like RNA-binding domain / S1 RNA binding domain / S1 domain / DNA-directed RNA polymerase, subunit beta-prime / RNA polymerase Rpb6 / RNA polymerase Rpb2, domain 2 superfamily / RNA polymerase, subunit omega/Rpo6/RPB6 / RNA polymerase Rpb6 / RNA polymerase Rpb1, domain 3 superfamily / RPB6/omega subunit-like superfamily / RNA polymerase Rpb1, clamp domain superfamily / RNA polymerase Rpb1, domain 3 / RNA polymerase Rpb1, domain 3 / RNA polymerase Rpb1, domain 1 / RNA polymerase Rpb1, domain 1 / RNA polymerase, beta subunit, protrusion / RNA polymerase beta subunit / DNA-directed RNA polymerase, insert domain / DNA-directed RNA polymerase, RpoA/D/Rpb3-type / RNA polymerase Rpb3/RpoA insert domain / RNA polymerase Rpb3/Rpb11 dimerisation domain / RNA polymerases D / RNA polymerase, alpha subunit / RNA polymerase Rpb1, domain 5 / RNA polymerase Rpb1, domain 4 / RNA polymerase Rpb1, domain 2 / RNA polymerase Rpb1, domain 5 / RNA polymerase Rpb1, domain 4 / RNA polymerase Rpb2, domain 2
Similarity search - Domain/homology
ADENOSINE-5'-TRIPHOSPHATE / : / DNA / DNA (> 10) / RNA / DNA-directed RNA polymerase II subunit RPB1 / DNA-directed RNA polymerase II subunit RPB2 / DNA-directed RNA polymerase II subunit RPB3 / DNA-directed RNA polymerase II subunit RPB4 / DNA-directed RNA polymerases I, II, and III subunit RPABC1 ...ADENOSINE-5'-TRIPHOSPHATE / : / DNA / DNA (> 10) / RNA / DNA-directed RNA polymerase II subunit RPB1 / DNA-directed RNA polymerase II subunit RPB2 / DNA-directed RNA polymerase II subunit RPB3 / DNA-directed RNA polymerase II subunit RPB4 / DNA-directed RNA polymerases I, II, and III subunit RPABC1 / DNA-directed RNA polymerases I, II, and III subunit RPABC2 / DNA-directed RNA polymerases I, II, and III subunit RPABC3 / DNA-directed RNA polymerases I, II, and III subunit RPABC5 / DNA-directed RNA polymerase II subunit RPB9 / DNA-directed RNA polymerase II subunit RPB7 / DNA-directed RNA polymerase II subunit RPB11 / DNA-directed RNA polymerases I, II, and III subunit RPABC4
Similarity search - Component
Biological speciesSaccharomyces cerevisiae (brewer's yeast)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 2.26 Å
AuthorsYi, G. / Li, Q. / Wang, D. / Zhang, P.
Funding support United Kingdom, United States, 6items
OrganizationGrant numberCountry
Wellcome Trust206422/Z/17/Z United Kingdom
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)GM102362 United States
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)GM148476 United States
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)GM147652 United States
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)AI170791-7522 United States
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)CA280467 United States
CitationJournal: Mol Cell / Year: 2026
Title: Sub-2 Å cryo-EM structures of transcribing RNA polymerase II reveal critical roles of water molecules in catalysis.
Authors: Qingrong Li / Gangshun Yi / Yue Wu / Sophy Xu / Jenny Chong / Xuhui Huang / Peijun Zhang / Dong Wang /
Abstract: RNA polymerase II (RNA Pol II) is central to gene expression, but its catalytic mechanism remains elusive due to the absence of high-resolution structural data. The role of water molecules in RNA Pol ...RNA polymerase II (RNA Pol II) is central to gene expression, but its catalytic mechanism remains elusive due to the absence of high-resolution structural data. The role of water molecules in RNA Pol II catalysis is unknown. Here, we present 3 high-resolution cryo-electron microscopy structures of active Saccharomyces cerevisiae RNA Pol II elongation complexes in distinct catalytic states: two pre-catalysis states at 1.96 Å and 2.26 Å resolution and a post-catalysis state at 2.33 Å resolution. Each structure contains over 700-1,350 ordered water molecules, many located at functionally critical positions. Comparative analysis shows that these waters play essential roles in proton-transfer steps during RNA Pol II catalysis, facilitating substrate recognition and trigger-loop folding during nucleotide addition. Strikingly, these waters are conserved between prokaryotic and eukaryotic transcription machineries (see Mueller and Darst). These findings provide unprecedented mechanistic insights into RNA Pol II catalysis and reveal vital and evolutionarily conserved roles of water molecules in transcription.
History
DepositionMar 8, 2025Deposition site: PDBE / Processing site: PDBE
Revision 1.0May 27, 2026Provider: repository / Type: Initial release
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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

Downloads & links

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Assembly

Deposited unit
A: DNA-directed RNA polymerase II subunit RPB1
B: DNA-directed RNA polymerase II subunit RPB2
C: DNA-directed RNA polymerase II subunit RPB3
D: DNA-directed RNA polymerase II subunit RPB4
E: DNA-directed RNA polymerases I, II, and III subunit RPABC1
F: DNA-directed RNA polymerases I, II, and III subunit RPABC2
G: DNA-directed RNA polymerase II subunit RPB7
H: DNA-directed RNA polymerases I, II, and III subunit RPABC3
I: DNA-directed RNA polymerase II subunit RPB9
J: DNA-directed RNA polymerases I, II, and III subunit RPABC5
K: DNA-directed RNA polymerase II subunit RPB11
L: DNA-directed RNA polymerases I, II, and III subunit RPABC4
N: DNA (44-MER)
R: RNA (5'-R(P*AP*UP*CP*GP*AP*GP*AP*GP*G)-3')
T: DNA (44-MER)
hetero molecules


Theoretical massNumber of molelcules
Total (without water)545,17327
Polymers544,05515
Non-polymers1,11812
Water12,989721
1


  • Idetical with deposited unit
  • defined by author&software
  • Evidence: electron microscopy, not applicable
TypeNameSymmetry operationNumber
identity operation1_555x,y,z1

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Components

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DNA-directed RNA polymerase II subunit ... , 7 types, 7 molecules ABCDGIK

#1: Protein DNA-directed RNA polymerase II subunit RPB1 / RNA polymerase II subunit B1 / DNA-directed RNA polymerase III largest subunit / RNA polymerase II ...RNA polymerase II subunit B1 / DNA-directed RNA polymerase III largest subunit / RNA polymerase II subunit B220


Mass: 191821.578 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Saccharomyces cerevisiae (brewer's yeast)
Gene: RPO21, RPB1, RPB220, SUA8, YDL140C, D2150 / Production host: Saccharomyces cerevisiae (brewer's yeast) / References: UniProt: P04050, DNA-directed RNA polymerase
#2: Protein DNA-directed RNA polymerase II subunit RPB2 / RNA polymerase II subunit 2 / B150 / DNA-directed RNA polymerase II 140 kDa polypeptide


Mass: 138937.297 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Saccharomyces cerevisiae (brewer's yeast)
Gene: RPB2, RPB150, RPO22, YOR151C / Production host: Saccharomyces cerevisiae (brewer's yeast) / References: UniProt: P08518, DNA-directed RNA polymerase
#3: Protein DNA-directed RNA polymerase II subunit RPB3 / RNA polymerase II subunit B3 / B44.5 / DNA-directed RNA polymerase II 45 kDa polypeptide


Mass: 35330.457 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Saccharomyces cerevisiae (brewer's yeast)
Gene: RPB3, YIL021W / Production host: Saccharomyces cerevisiae (brewer's yeast) / References: UniProt: P16370
#4: Protein DNA-directed RNA polymerase II subunit RPB4 / RNA polymerase II subunit B4 / B32 / DNA-directed RNA polymerase II 32 kDa polypeptide


Mass: 25451.191 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Saccharomyces cerevisiae (brewer's yeast)
Gene: RPB4, YJL140W, J0654 / Production host: Saccharomyces cerevisiae (brewer's yeast) / References: UniProt: P20433
#7: Protein DNA-directed RNA polymerase II subunit RPB7 / RNA polymerase II subunit B7 / B16


Mass: 19081.053 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Saccharomyces cerevisiae (brewer's yeast)
Gene: RPB7, YDR404C, D9509.22 / Production host: Saccharomyces cerevisiae (brewer's yeast) / References: UniProt: P34087
#9: Protein DNA-directed RNA polymerase II subunit RPB9 / RNA polymerase II subunit B9 / B12.6 / DNA-directed RNA polymerase II 14.2 kDa polypeptide / DNA- ...RNA polymerase II subunit B9 / B12.6 / DNA-directed RNA polymerase II 14.2 kDa polypeptide / DNA-directed RNA polymerase II subunit 9


Mass: 14308.161 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Saccharomyces cerevisiae (brewer's yeast)
Gene: RPB9, YGL070C / Production host: Saccharomyces cerevisiae (brewer's yeast) / References: UniProt: P27999
#11: Protein DNA-directed RNA polymerase II subunit RPB11 / RNA polymerase II subunit B11 / B13.6 / DNA-directed RNA polymerase II 13.6 kDa polypeptide


Mass: 13633.493 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Saccharomyces cerevisiae (brewer's yeast)
Gene: RPB11, YOL005C / Production host: Saccharomyces cerevisiae (brewer's yeast) / References: UniProt: P38902

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DNA-directed RNA polymerases I, II, and III subunit ... , 5 types, 5 molecules EFHJL

#5: Protein DNA-directed RNA polymerases I, II, and III subunit RPABC1 / RNA polymerases I / II / and III subunit ABC1 / ABC27 / DNA-directed RNA polymerases I / and III 27 ...RNA polymerases I / II / and III subunit ABC1 / ABC27 / DNA-directed RNA polymerases I / and III 27 kDa polypeptide


Mass: 25117.094 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Saccharomyces cerevisiae (brewer's yeast)
Gene: RPB5, RPA7, RPC9, YBR154C, YBR1204 / Production host: Saccharomyces cerevisiae (brewer's yeast) / References: UniProt: P20434
#6: Protein DNA-directed RNA polymerases I, II, and III subunit RPABC2 / RNA polymerases I / II / and III subunit ABC2 / ABC23 / DNA-directed RNA polymerases I / and III 23 ...RNA polymerases I / II / and III subunit ABC2 / ABC23 / DNA-directed RNA polymerases I / and III 23 kDa polypeptide


Mass: 17931.834 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Saccharomyces cerevisiae (brewer's yeast)
Gene: RPO26, RPB6, YPR187W, P9677.8 / Production host: Saccharomyces cerevisiae (brewer's yeast) / References: UniProt: P20435
#8: Protein DNA-directed RNA polymerases I, II, and III subunit RPABC3 / RNA polymerases I / II / and III subunit ABC3 / ABC14.4 / ABC14.5 / DNA-directed RNA polymerases I ...RNA polymerases I / II / and III subunit ABC3 / ABC14.4 / ABC14.5 / DNA-directed RNA polymerases I / and III 14.5 kDa polypeptide


Mass: 16525.363 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Saccharomyces cerevisiae (brewer's yeast)
Gene: RPB8, YOR224C, YOR50-14 / Production host: Saccharomyces cerevisiae (brewer's yeast) / References: UniProt: P20436
#10: Protein DNA-directed RNA polymerases I, II, and III subunit RPABC5 / RNA polymerases I / II / and III subunit ABC5 / ABC10-beta / ABC8 / DNA-directed RNA polymerases I ...RNA polymerases I / II / and III subunit ABC5 / ABC10-beta / ABC8 / DNA-directed RNA polymerases I / and III 8.3 kDa polypeptide


Mass: 8290.732 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Saccharomyces cerevisiae (brewer's yeast)
Gene: RPB10, YOR210W / Production host: Saccharomyces cerevisiae (brewer's yeast) / References: UniProt: P22139
#12: Protein DNA-directed RNA polymerases I, II, and III subunit RPABC4 / RNA polymerases I / II / and III subunit ABC4 / ABC10-alpha


Mass: 7729.969 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Saccharomyces cerevisiae (brewer's yeast)
Gene: RPC10, RPB12, YHR143W-A, YHR143BW / Production host: Saccharomyces cerevisiae (brewer's yeast) / References: UniProt: P40422

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DNA chain , 2 types, 2 molecules NT

#13: DNA chain DNA (44-MER)


Mass: 13696.801 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Saccharomyces cerevisiae (brewer's yeast)
Production host: Saccharomyces cerevisiae (brewer's yeast)
#15: DNA chain DNA (44-MER)


Mass: 13265.462 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Saccharomyces cerevisiae (brewer's yeast)
Production host: Saccharomyces cerevisiae (brewer's yeast)

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RNA chain , 1 types, 1 molecules R

#14: RNA chain RNA (5'-R(P*AP*UP*CP*GP*AP*GP*AP*GP*G)-3')


Mass: 2934.831 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Saccharomyces cerevisiae (brewer's yeast)
Production host: Saccharomyces cerevisiae (brewer's yeast)

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Non-polymers , 5 types, 733 molecules

#16: Chemical ChemComp-ATP / ADENOSINE-5'-TRIPHOSPHATE


Mass: 507.181 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: C10H16N5O13P3 / Feature type: SUBJECT OF INVESTIGATION / Comment: ATP, energy-carrying molecule*YM
#17: Chemical ChemComp-MG / MAGNESIUM ION


Mass: 24.305 Da / Num. of mol.: 2 / Source method: obtained synthetically / Formula: Mg / Feature type: SUBJECT OF INVESTIGATION
#18: Chemical ChemComp-K / POTASSIUM ION


Mass: 39.098 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: K / Feature type: SUBJECT OF INVESTIGATION
#19: Chemical
ChemComp-ZN / ZINC ION


Mass: 65.409 Da / Num. of mol.: 8 / Source method: obtained synthetically / Formula: Zn / Feature type: SUBJECT OF INVESTIGATION
#20: Water ChemComp-HOH / water


Mass: 18.015 Da / Num. of mol.: 721 / Source method: isolated from a natural source / Formula: H2O

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Details

Has ligand of interestY
Has protein modificationN

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Experimental details

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Experiment

ExperimentMethod: ELECTRON MICROSCOPY
EM experimentAggregation state: PARTICLE / 3D reconstruction method: single particle reconstruction

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Sample preparation

ComponentName: Yeast RNA Polymerase II elongation complex / Type: COMPLEX / Entity ID: #1-#15 / Source: RECOMBINANT
Molecular weightValue: 0.513 MDa / Experimental value: YES
Source (natural)Organism: Saccharomyces cerevisiae (brewer's yeast)
Source (recombinant)Organism: Saccharomyces cerevisiae (brewer's yeast)
Buffer solutionpH: 7.5
SpecimenConc.: 1 mg/ml / Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
Specimen supportGrid material: COPPER / Grid mesh size: 300 divisions/in. / Grid type: Quantifoil R2/1
VitrificationInstrument: FEI VITROBOT MARK II / Cryogen name: ETHANE / Humidity: 100 % / Chamber temperature: 277.15 K

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Electron microscopy imaging

Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company
MicroscopyModel: TFS KRIOS
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: FLOOD BEAM
Electron lensMode: BRIGHT FIELD / Nominal defocus max: 2500 nm / Nominal defocus min: 500 nm / C2 aperture diameter: 100 µm
Image recordingElectron dose: 50 e/Å2 / Film or detector model: GATAN K3 (6k x 4k)

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Processing

EM software
IDNameVersionCategory
1cryoSPARC4.7.1particle selection
2PHENIX1.21_5207model refinement
13PHENIX3D reconstruction
14Coot3D reconstruction
CTF correctionType: NONE
3D reconstructionResolution: 2.26 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 692163 / Symmetry type: POINT
RefinementHighest resolution: 2.26 Å
Stereochemistry target values: REAL-SPACE (WEIGHTED MAP SUM AT ATOM CENTERS)
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.00333858
ELECTRON MICROSCOPYf_angle_d0.58946133
ELECTRON MICROSCOPYf_dihedral_angle_d16.7875313
ELECTRON MICROSCOPYf_chiral_restr0.0435189
ELECTRON MICROSCOPYf_plane_restr0.0055626

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