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- PDB-6flq: CryoEM structure of E.coli RNA polymerase paused elongation compl... -

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Basic information

Entry
Database: PDB / ID: 6flq
TitleCryoEM structure of E.coli RNA polymerase paused elongation complex bound to NusA
Components
  • (DNA-directed RNA polymerase subunit ...Polymerase) x 4
  • DNA (31-MER)
  • DNA (39-MER)
  • RNA (5'-R(*CP*CP*UP*GP*AP*UP*CP*AP*GP*GP*CP*GP*AP*UP*GP*UP*GP*UP*GP*CP*U)-3')
  • Transcription termination/antitermination protein NusA
KeywordsTRANSCRIPTION / RNA polymerase / Transcriptional pausing / his pause / NusA
Function / homology
Function and homology information


bacterial-type RNA polymerase core enzyme binding / RNA polymerase complex / submerged biofilm formation / cellular response to cell envelope stress / cytosolic DNA-directed RNA polymerase complex / regulation of DNA-templated transcription initiation / bacterial-type flagellum assembly / bacterial-type flagellum-dependent cell motility / nitrate assimilation / transcription elongation factor complex ...bacterial-type RNA polymerase core enzyme binding / RNA polymerase complex / submerged biofilm formation / cellular response to cell envelope stress / cytosolic DNA-directed RNA polymerase complex / regulation of DNA-templated transcription initiation / bacterial-type flagellum assembly / bacterial-type flagellum-dependent cell motility / nitrate assimilation / transcription elongation factor complex / regulation of DNA-templated transcription elongation / transcription antitermination / cell motility / DNA-templated transcription initiation / DNA-templated transcription termination / ribonucleoside binding / DNA-directed 5'-3' RNA polymerase activity / DNA-directed RNA polymerase / ribosome biogenesis / protein complex oligomerization / response to heat / protein-containing complex assembly / intracellular iron ion homeostasis / protein dimerization activity / DNA-binding transcription factor activity / protein domain specific binding / nucleotide binding / response to antibiotic / magnesium ion binding / DNA binding / RNA binding / zinc ion binding / membrane / cytosol / cytoplasm
Similarity search - Function
Transcription termination factor NusA, C-terminal duplication / Transcription termination factor NusA / Transcription factor NusA, N-terminal / KH domain, NusA-like / NusA, N-terminal domain superfamily / NusA N-terminal domain / NusA-like KH domain / Transcription termination/antitermination protein NusA, bacterial / Type-1 KH domain profile. / DNA repair Rad51/transcription factor NusA, alpha-helical ...Transcription termination factor NusA, C-terminal duplication / Transcription termination factor NusA / Transcription factor NusA, N-terminal / KH domain, NusA-like / NusA, N-terminal domain superfamily / NusA N-terminal domain / NusA-like KH domain / Transcription termination/antitermination protein NusA, bacterial / Type-1 KH domain profile. / DNA repair Rad51/transcription factor NusA, alpha-helical / Helix-hairpin-helix domain / S1 domain profile. / DNA-directed RNA polymerase, omega subunit / DNA-directed RNA polymerase, subunit beta-prime, bacterial type / DNA-directed RNA polymerase, beta subunit, external 1 domain superfamily / DNA-directed RNA polymerase, beta subunit, external 1 domain / RNA polymerase beta subunit external 1 domain / RNA polymerase, alpha subunit, C-terminal / Bacterial RNA polymerase, alpha chain C terminal domain / DNA-directed RNA polymerase, alpha subunit / DNA-directed RNA polymerase beta subunit, bacterial-type / Ribosomal protein S1-like RNA-binding domain / S1 RNA binding domain / S1 domain / RNA polymerase Rpb6 / RNA polymerase, subunit omega/Rpo6/RPB6 / RNA polymerase Rpb6 / RNA polymerase Rpb1, domain 3 superfamily / RNA polymerase Rpb1, clamp domain superfamily / RPB6/omega subunit-like superfamily / DNA-directed RNA polymerase, subunit beta-prime / RNA polymerase Rpb1, domain 3 / RNA polymerase Rpb1, domain 3 / RNA polymerase Rpb2, domain 2 superfamily / RNA polymerase Rpb1, domain 1 / RNA polymerase Rpb1, domain 1 / RNA polymerase, alpha subunit / RNA polymerase Rpb1, domain 4 / RNA polymerase Rpb1, domain 2 / RNA polymerase Rpb1, domain 4 / RNA polymerase, N-terminal / RNA polymerase Rpb1, funnel domain superfamily / RNA polymerase I subunit A N-terminus / RNA polymerase Rpb1, domain 5 / RNA polymerase Rpb1, domain 5 / 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 / DNA-directed RNA polymerase, insert domain superfamily / RNA polymerase, RBP11-like subunit / RNA polymerase Rpb2, domain 2 / RNA polymerase Rpb2, domain 2 / RNA polymerase, beta subunit, conserved site / RNA polymerase Rpb2, domain 7 / RNA polymerase Rpb2, domain 3 / RNA polymerase Rpb2, OB-fold / RNA polymerase Rpb2, domain 7 / RNA polymerase Rpb2, domain 3 / RNA polymerases beta chain signature. / DNA-directed RNA polymerase, subunit 2, hybrid-binding domain / DNA-directed RNA polymerase, subunit 2 / DNA-directed RNA polymerase, subunit 2, hybrid-binding domain superfamily / RNA polymerase Rpb2, domain 6 / K homology domain superfamily, prokaryotic type / K homology domain-like, alpha/beta / Nucleic acid-binding, OB-fold
Similarity search - Domain/homology
DNA / DNA (> 10) / RNA / RNA (> 10) / DNA-directed RNA polymerase subunit alpha / DNA-directed RNA polymerase subunit omega / DNA-directed RNA polymerase subunit beta' / DNA-directed RNA polymerase subunit beta / Transcription termination/antitermination protein NusA
Similarity search - Component
Biological speciesEscherichia coli (E. coli)
synthetic construct (others)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.6 Å
AuthorsGuo, X. / Weixlbaumer, A.
Funding support France, 1items
OrganizationGrant numberCountry
European Research CouncilERC starting grant 679734 France
CitationJournal: Mol Cell / Year: 2018
Title: Structural Basis for NusA Stabilized Transcriptional Pausing.
Authors: Xieyang Guo / Alexander G Myasnikov / James Chen / Corinne Crucifix / Gabor Papai / Maria Takacs / Patrick Schultz / Albert Weixlbaumer /
Abstract: Transcriptional pausing by RNA polymerases (RNAPs) is a key mechanism to regulate gene expression in all kingdoms of life and is a prerequisite for transcription termination. The essential bacterial ...Transcriptional pausing by RNA polymerases (RNAPs) is a key mechanism to regulate gene expression in all kingdoms of life and is a prerequisite for transcription termination. The essential bacterial transcription factor NusA stimulates both pausing and termination of transcription, thus playing a central role. Here, we report single-particle electron cryo-microscopy reconstructions of NusA bound to paused E. coli RNAP elongation complexes with and without a pause-enhancing hairpin in the RNA exit channel. The structures reveal four interactions between NusA and RNAP that suggest how NusA stimulates RNA folding, pausing, and termination. An asymmetric translocation intermediate of RNA and DNA converts the active site of the enzyme into an inactive state, providing a structural explanation for the inhibition of catalysis. Comparing RNAP at different stages of pausing provides insights on the dynamic nature of the process and the role of NusA as a regulatory factor.
History
DepositionJan 26, 2018Deposition site: PDBE / Processing site: PDBE
Revision 1.0Mar 21, 2018Provider: repository / Type: Initial release
Revision 1.1Dec 11, 2019Group: Other / Category: atom_sites
Item: _atom_sites.fract_transf_matrix[1][1] / _atom_sites.fract_transf_matrix[2][2] / _atom_sites.fract_transf_matrix[3][3]

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Structure visualization

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Assembly

Deposited unit
A: DNA-directed RNA polymerase subunit alpha
B: DNA-directed RNA polymerase subunit alpha
C: DNA-directed RNA polymerase subunit beta
D: DNA-directed RNA polymerase subunit beta'
E: DNA-directed RNA polymerase subunit omega
F: Transcription termination/antitermination protein NusA
N: DNA (31-MER)
R: RNA (5'-R(*CP*CP*UP*GP*AP*UP*CP*AP*GP*GP*CP*GP*AP*UP*GP*UP*GP*UP*GP*CP*U)-3')
T: DNA (39-MER)
hetero molecules


Theoretical massNumber of molelcules
Total (without water)472,85612
Polymers472,7019
Non-polymers1553
Water0
1


  • Idetical with deposited unit
  • defined by software
  • Evidence: gel filtration
TypeNameSymmetry operationNumber
identity operation1_555x,y,z1
Buried area39000 Å2
ΔGint-260 kcal/mol
Surface area170340 Å2
MethodPISA

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Components

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DNA-directed RNA polymerase subunit ... , 4 types, 5 molecules ABCDE

#1: Protein DNA-directed RNA polymerase subunit alpha / Polymerase / RNAP subunit alpha / RNA polymerase subunit alpha / Transcriptase subunit alpha


Mass: 36558.680 Da / Num. of mol.: 2
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Escherichia coli (strain K12) (bacteria)
Strain: K12 / Gene: rpoA, pez, phs, sez, b3295, JW3257 / Production host: Escherichia coli BL21(DE3) (bacteria) / References: UniProt: P0A7Z4, DNA-directed RNA polymerase
#2: Protein DNA-directed RNA polymerase subunit beta / Polymerase / RNAP subunit beta / RNA polymerase subunit beta / Transcriptase subunit beta


Mass: 150820.875 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Escherichia coli (strain K12) (bacteria)
Strain: K12
Gene: rpoB, groN, nitB, rif, ron, stl, stv, tabD, b3987, JW3950
Production host: Escherichia coli BL21(DE3) (bacteria) / References: UniProt: P0A8V2, DNA-directed RNA polymerase
#3: Protein DNA-directed RNA polymerase subunit beta' / Polymerase / RNAP subunit beta' / RNA polymerase subunit beta' / Transcriptase subunit beta'


Mass: 155366.781 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Escherichia coli (strain K12) (bacteria)
Strain: K12 / Gene: rpoC, tabB, b3988, JW3951 / Production host: Escherichia coli BL21(DE3) (bacteria) / References: UniProt: P0A8T7, DNA-directed RNA polymerase
#4: Protein DNA-directed RNA polymerase subunit omega / Polymerase / RNAP omega subunit / RNA polymerase omega subunit / Transcriptase subunit omega


Mass: 10249.547 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Escherichia coli (strain K12) (bacteria)
Strain: K12 / Gene: rpoZ, b3649, JW3624 / Production host: Escherichia coli BL21(DE3) (bacteria) / References: UniProt: P0A800, DNA-directed RNA polymerase

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DNA chain , 2 types, 2 molecules NT

#6: DNA chain DNA (31-MER)


Mass: 9676.235 Da / Num. of mol.: 1 / Source method: obtained synthetically / Source: (synth.) synthetic construct (others)
#8: DNA chain DNA (39-MER)


Mass: 11815.586 Da / Num. of mol.: 1 / Source method: obtained synthetically / Source: (synth.) synthetic construct (others)

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Protein / RNA chain , 2 types, 2 molecules FR

#5: Protein Transcription termination/antitermination protein NusA / N utilization substance protein A / Transcription termination/antitermination L factor


Mass: 54932.684 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Escherichia coli (strain K12) (bacteria)
Strain: K12 / Gene: nusA, b3169, JW3138 / Production host: Escherichia coli BL21(DE3) (bacteria) / References: UniProt: P0AFF6
#7: RNA chain RNA (5'-R(*CP*CP*UP*GP*AP*UP*CP*AP*GP*GP*CP*GP*AP*UP*GP*UP*GP*UP*GP*CP*U)-3')


Mass: 6722.005 Da / Num. of mol.: 1 / Source method: obtained synthetically / Source: (synth.) synthetic construct (others)

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Non-polymers , 2 types, 3 molecules

#9: Chemical ChemComp-MG / MAGNESIUM ION


Mass: 24.305 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: Mg
#10: Chemical ChemComp-ZN / ZINC ION


Mass: 65.409 Da / Num. of mol.: 2 / Source method: obtained synthetically / Formula: Zn

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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

Component
IDNameTypeEntity IDParent-IDSource
1Cryo-EM structure of E. coli RNA polymerase paused elongation complex bound to NusACOMPLEX#1-#80MULTIPLE SOURCES
2RNA polymerase, NusACOMPLEX#1-#51RECOMBINANT
3Nucleic AcidsNucleic acidCOMPLEX#6-#81RECOMBINANT
Source (natural)
IDEntity assembly-IDOrganismNcbi tax-ID
22Escherichia coli K-12 (bacteria)83333
32Escherichia coli K-12 (bacteria)83333
Source (recombinant)
IDEntity assembly-IDOrganismNcbi tax-ID
22Escherichia coli BL21(DE3) (bacteria)469008
33synthetic construct (others)32630
Buffer solutionpH: 8
Buffer component
IDConc.NameFormulaBuffer-ID
110 mMHEPESC8H18N2O4S1
2150 mMPotassium acetateCH3CO2K1
32 mMDithiothreitolC4H10O2S21
410 uMZinc chlorideZnCl21
55 mMMagnesium acetateMg(CH3COO)21
68 mMCHAPSOCHAPS detergentC32H58N2O8S1
SpecimenEmbedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
Specimen supportGrid material: COPPER / Grid mesh size: 400 divisions/in. / Grid type: C-flat-1.2/1.3 4C
VitrificationInstrument: FEI VITROBOT MARK IV / Cryogen name: ETHANE / Humidity: 95 % / Chamber temperature: 283.15 K

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Electron microscopy imaging

Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company
MicroscopyModel: FEI TITAN KRIOS
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: SPOT SCAN
Electron lensMode: BRIGHT FIELDBright-field microscopy / Nominal magnification: 105000 X / Nominal defocus max: 3200 nm / Nominal defocus min: 800 nm / Cs: 0.001 mm
Specimen holderCryogen: NITROGEN / Specimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER
Image recordingAverage exposure time: 8 sec. / Electron dose: 53 e/Å2 / Detector mode: SUPER-RESOLUTION / Film or detector model: GATAN K2 SUMMIT (4k x 4k) / Num. of real images: 4957
EM imaging opticsEnergyfilter name: GIF Quantum ER / Energyfilter upper: 20 eV / Energyfilter lower: 0 eV
Image scansMovie frames/image: 40 / Used frames/image: 3-40

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Processing

SoftwareName: PHENIX / Version: 1.12_2829: / Classification: refinement
EM software
IDNameVersionCategory
1SerialEMimage acquisition
3CTFFIND4CTF correction
6PHENIXmodel fitting
8RELION2.1initial Euler assignment
9cryoSPARCfinal Euler assignment
10RELION2.1classification
11cryoSPARC3D reconstruction
12Cootmodel refinement
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
Particle selectionNum. of particles selected: 157100
SymmetryPoint symmetry: C1 (asymmetric)
3D reconstructionResolution: 3.6 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 157100 / Symmetry type: POINT
Atomic model buildingProtocol: RIGID BODY FIT / Space: REAL
RefinementHighest resolution: 4.1 Å
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.01630786
ELECTRON MICROSCOPYf_angle_d1.29642114
ELECTRON MICROSCOPYf_dihedral_angle_d10.4218529
ELECTRON MICROSCOPYf_chiral_restr0.0744931
ELECTRON MICROSCOPYf_plane_restr0.0095260

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