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- PDB-7rdq: Cryo-EM structure of Thermus thermophilus reiterative transcripti... -

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Basic information

Entry
Database: PDB / ID: 7rdq
TitleCryo-EM structure of Thermus thermophilus reiterative transcription complex with 11nt oligo-G RNA
Components
  • (DNA (31-MER) ...) x 2
  • (DNA-directed RNA polymerase subunit ...) x 4
  • RNA (5'-R(P*GP*GP*GP*GP*GP*GP*GP*GP*GP*GP*G)-3')
  • RNA polymerase sigma factor SigA
KeywordsTRANSCRIPTION / Thermus thermophilus / transcription initiation
Function / homology
Function and homology information


sigma factor activity / DNA-directed RNA polymerase complex / DNA-templated transcription initiation / ribonucleoside binding / DNA-directed 5'-3' RNA polymerase activity / DNA-directed RNA polymerase / protein dimerization activity / DNA-templated transcription / magnesium ion binding / DNA binding ...sigma factor activity / DNA-directed RNA polymerase complex / DNA-templated transcription initiation / ribonucleoside binding / DNA-directed 5'-3' RNA polymerase activity / DNA-directed RNA polymerase / protein dimerization activity / DNA-templated transcription / magnesium ion binding / DNA binding / zinc ion binding / metal ion binding / cytoplasm
Similarity search - Function
: / DNA-directed RNA polymerase subunit beta', hybrid domain / RNA polymerase sigma factor RpoD, C-terminal / RNA polymerase sigma factor RpoD / RNA polymerase sigma-70 region 1.2 / Sigma-70 factor, region 1.2 / RNA polymerase sigma-70 region 3 / Sigma-70 region 3 / Sigma-70 factors family signature 2. / RNA polymerase sigma-70 ...: / DNA-directed RNA polymerase subunit beta', hybrid domain / RNA polymerase sigma factor RpoD, C-terminal / RNA polymerase sigma factor RpoD / RNA polymerase sigma-70 region 1.2 / Sigma-70 factor, region 1.2 / RNA polymerase sigma-70 region 3 / Sigma-70 region 3 / Sigma-70 factors family signature 2. / RNA polymerase sigma-70 / RNA polymerase sigma-70 region 4 / Sigma-70, region 4 / RNA polymerase sigma-70 region 2 / RNA polymerase sigma-70 like domain / Sigma-70 region 2 / RNA polymerase sigma factor, region 2 / RNA polymerase sigma factor, region 3/4-like / 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 / 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 Rpb2, domain 2 superfamily / RNA polymerase Rpb1, domain 3 / RNA polymerase Rpb1, domain 3 / 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, beta subunit, protrusion / RNA polymerase beta subunit / 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 / 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 / Winged helix-like DNA-binding domain superfamily
Similarity search - Domain/homology
DNA / DNA (> 10) / RNA / RNA (> 10) / DNA-directed RNA polymerase subunit alpha / RNA polymerase sigma factor SigA / DNA-directed RNA polymerase subunit omega / DNA-directed RNA polymerase subunit beta' / DNA-directed RNA polymerase subunit beta
Similarity search - Component
Biological speciesThermus thermophilus HB8 (bacteria)
synthetic construct (others)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3 Å
AuthorsLiu, Y. / Ebright, R.H.
Funding support United States, 1items
OrganizationGrant numberCountry
National Institutes of Health/National Institute of Environmental Health Sciences (NIH/NIEHS) United States
CitationJournal: Proc Natl Acad Sci U S A / Year: 2022
Title: Structural and mechanistic basis of reiterative transcription initiation.
Authors: Yu Liu / Libing Yu / Chirangini Pukhrambam / Jared T Winkelman / Emre Firlar / Jason T Kaelber / Yu Zhang / Bryce E Nickels / Richard H Ebright /
Abstract: Reiterative transcription initiation, observed at promoters that contain homopolymeric sequences at the transcription start site, generates RNA products having 5' sequences noncomplementary to the ...Reiterative transcription initiation, observed at promoters that contain homopolymeric sequences at the transcription start site, generates RNA products having 5' sequences noncomplementary to the DNA template. Here, using crystallography and cryoelectron microscopy to define structures, protein-DNA photocrosslinking to map positions of RNAP leading and trailing edges relative to DNA, and single-molecule DNA nanomanipulation to assess RNA polymerase (RNAP)-dependent DNA unwinding, we show that RNA extension in reiterative transcription initiation 1) occurs without DNA scrunching; 2) involves a short, 2- to 3-bp, RNA-DNA hybrid; and 3) generates RNA that exits RNAP through the portal by which scrunched nontemplate-strand DNA exits RNAP in standard transcription initiation. The results establish that, whereas RNA extension in standard transcription initiation proceeds through a scrunching mechanism, RNA extension in reiterative transcription initiation proceeds through a slippage mechanism, with slipping of RNA relative to DNA within a short RNA-DNA hybrid, and with extrusion of RNA from RNAP through an alternative RNA exit.
History
DepositionJul 10, 2021Deposition site: RCSB / Processing site: RCSB
Revision 1.0Feb 2, 2022Provider: repository / Type: Initial release
Revision 1.1Feb 9, 2022Group: Database references / Category: citation / Item: _citation.pdbx_database_id_PubMed / _citation.title
Revision 1.2Jun 5, 2024Group: Data collection / Refinement description
Category: chem_comp_atom / chem_comp_bond ...chem_comp_atom / chem_comp_bond / em_3d_fitting_list / pdbx_initial_refinement_model
Item: _em_3d_fitting_list.accession_code / _em_3d_fitting_list.initial_refinement_model_id ..._em_3d_fitting_list.accession_code / _em_3d_fitting_list.initial_refinement_model_id / _em_3d_fitting_list.source_name / _em_3d_fitting_list.type

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Structure visualization

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  • Deposited structure unit
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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: RNA polymerase sigma factor SigA
H: DNA (31-MER) nontemplate strand
G: DNA (31-MER) template strand
I: RNA (5'-R(P*GP*GP*GP*GP*GP*GP*GP*GP*GP*GP*G)-3')
hetero molecules


Theoretical massNumber of molelcules
Total (without water)451,11416
Polymers450,8629
Non-polymers2527
Water00
1


  • Idetical with deposited unit
  • defined by author
  • Evidence: gel filtration
TypeNameSymmetry operationNumber
identity operation1_5551

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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 / RNAP subunit alpha / RNA polymerase subunit alpha / Transcriptase subunit alpha


Mass: 35056.164 Da / Num. of mol.: 2 / Source method: isolated from a natural source / Source: (natural) Thermus thermophilus HB8 (bacteria) / Strain: HB8 / ATCC 27634 / DSM 579 / References: UniProt: Q5SHR6, DNA-directed RNA polymerase
#2: Protein DNA-directed RNA polymerase subunit beta / RNAP subunit beta / RNA polymerase subunit beta / Transcriptase subunit beta


Mass: 125436.539 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Thermus thermophilus HB8 (bacteria) / Strain: HB8 / ATCC 27634 / DSM 579 / References: UniProt: Q8RQE9, DNA-directed RNA polymerase
#3: Protein DNA-directed RNA polymerase subunit beta' / RNAP subunit beta' / RNA polymerase subunit beta' / Transcriptase subunit beta'


Mass: 170997.391 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Thermus thermophilus HB8 (bacteria) / Strain: HB8 / ATCC 27634 / DSM 579 / References: UniProt: Q8RQE8, DNA-directed RNA polymerase
#4: Protein DNA-directed RNA polymerase subunit omega / RNAP omega subunit / RNA polymerase omega subunit / Transcriptase subunit omega


Mass: 11533.316 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Thermus thermophilus HB8 (bacteria) / Strain: HB8 / ATCC 27634 / DSM 579 / References: UniProt: Q8RQE7, DNA-directed RNA polymerase

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DNA (31-MER) ... , 2 types, 2 molecules HG

#6: DNA chain DNA (31-MER) nontemplate strand


Mass: 10331.629 Da / Num. of mol.: 1 / Source method: obtained synthetically / Source: (synth.) synthetic construct (others)
#7: DNA chain DNA (31-MER) template strand


Mass: 10100.500 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 FI

#5: Protein RNA polymerase sigma factor SigA


Mass: 48598.031 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Thermus thermophilus HB8 (bacteria) / Strain: HB8 / ATCC 27634 / DSM 579 / Gene: sigA, TTHA0532 / Production host: Escherichia coli BL21(DE3) (bacteria) / References: UniProt: Q5SKW1
#8: RNA chain RNA (5'-R(P*GP*GP*GP*GP*GP*GP*GP*GP*GP*GP*G)-3')


Mass: 3752.306 Da / Num. of mol.: 1 / Source method: obtained synthetically / Source: (synth.) synthetic construct (others)

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Non-polymers , 2 types, 7 molecules

#9: Chemical
ChemComp-MG / MAGNESIUM ION


Mass: 24.305 Da / Num. of mol.: 5 / 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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Details

Has ligand of interestN

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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: reiterative transcription initiation complex with 11nt oligo-G RNA
Type: COMPLEX / Entity ID: #1-#8 / Source: MULTIPLE SOURCES
Molecular weightValue: 0.425 MDa / Experimental value: NO
Source (natural)Organism: Thermus thermophilus HB8 (bacteria)
Buffer solutionpH: 7.9
Buffer component
IDConc.NameFormulaBuffer-ID
120 mMTris hydrochlorideTris-HCl1
2100 mMsodium chlorideNaCl1
35 mMMagnesium chlorideMgCl21
SpecimenConc.: 0.69 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 IV / Cryogen name: ETHANE / Humidity: 95 % / Chamber temperature: 277 K

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Electron microscopy imaging

Experimental equipment
Model: Talos Arctica / Image courtesy: FEI Company
MicroscopyModel: FEI TALOS ARCTICA
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 200 kV / Illumination mode: FLOOD BEAM
Electron lensMode: BRIGHT FIELD / Nominal defocus max: -2800 nm / Nominal defocus min: -1200 nm
Image recordingAverage exposure time: 0.2 sec. / Electron dose: 0.994 e/Å2 / Detector mode: COUNTING / Film or detector model: GATAN K2 QUANTUM (4k x 4k) / Num. of grids imaged: 1 / Num. of real images: 3424
Image scansMovie frames/image: 30 / Used frames/image: 1-30

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Processing

Software
NameVersionClassification
phenix.real_space_refine1.19.2_4158refinement
PHENIX1.19.2_4158refinement
EM software
IDNameVersionCategory
1RELION3.1.0particle selection
2SerialEMimage acquisition
4CTFFIND4.1CTF correction
7Cootmodel fitting
9PHENIXmodel refinement
10RELION3.1.0initial Euler assignment
11RELION3.1.0final Euler assignment
12RELION3.1.0classification
13RELION3.1.03D reconstruction
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
Particle selectionNum. of particles selected: 2143284
SymmetryPoint symmetry: C1 (asymmetric)
3D reconstructionResolution: 3 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 339426 / Num. of class averages: 3 / Symmetry type: POINT
Atomic model building
IDProtocolSpace
1RIGID BODY FITREAL
2
3
4
5
6
Atomic model building

Accession code: 4G7H / Initial refinement model-ID: 1 / PDB-ID: 4G7H

4g7h

/ Source name: PDB / Type: experimental model

IDPdb chain-ID 3D fitting-ID
1A1
2B2
3C3
4D4
5E5
6F6
RefinementCross valid method: NONE

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