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- PDB-9m84: Cryo-EM structure of Streptomyces coelicolor sigma factor shbA tr... -

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Basic information

Entry
Database: PDB / ID: 9m84
TitleCryo-EM structure of Streptomyces coelicolor sigma factor shbA transcription initiation complex with shbA promoter
Components
  • (DNA-directed RNA polymerase subunit ...) x 3
  • DNA (27-MER)
  • DNA (31-MER)
  • ECF sigma factor
KeywordsDNA BINDING PROTEIN / RNA polymerase holoenzyme / TRANSCRIPTION / TRANSFERASE-DNA-RNA complex
Function / homology
Function and homology information


nucleoid / sigma factor activity / DNA-directed RNA polymerase complex / DNA-templated transcription initiation / ribonucleoside binding / DNA-directed RNA polymerase / DNA-directed RNA polymerase activity / protein dimerization activity / DNA-templated transcription / regulation of DNA-templated transcription ...nucleoid / sigma factor activity / DNA-directed RNA polymerase complex / DNA-templated transcription initiation / ribonucleoside binding / DNA-directed RNA polymerase / DNA-directed RNA polymerase activity / protein dimerization activity / DNA-templated transcription / regulation of DNA-templated transcription / magnesium ion binding / DNA binding / zinc ion binding / cytoplasm
Similarity search - Function
RNA polymerase sigma-70 like / 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, subunit beta-prime, bacterial type ...RNA polymerase sigma-70 like / 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, 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 beta subunit, bacterial-type / DNA-directed RNA polymerase, alpha subunit / DNA-directed RNA polymerase, subunit beta-prime / RNA polymerase Rpb2, domain 2 superfamily / RNA polymerase Rpb1, domain 3 superfamily / 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 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 / 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 / DNA-directed RNA polymerase, insert domain superfamily / RNA polymerase, N-terminal / RNA polymerase Rpb2, domain 2 / RNA polymerase Rpb1, funnel domain superfamily / RNA polymerase Rpb2, domain 2 / RNA polymerase I subunit A N-terminus / RNA polymerase, RBP11-like subunit / 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) / DNA-directed RNA polymerase subunit alpha / DNA-directed RNA polymerase subunit beta' / ECF sigma factor / DNA-directed RNA polymerase subunit beta
Similarity search - Component
Biological speciesStreptomyces coelicolor A3
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.61 Å
AuthorsLiu, G. / Zheng, J.
Funding support China, 1items
OrganizationGrant numberCountry
National Natural Science Foundation of China (NSFC)31770068,32070040 China
CitationJournal: Nucleic Acids Res / Year: 2025
Title: Molecular basis of Streptomyces ECF σShbA factors transcribing principal σHrdB genes.
Authors: Guiyang Liu / Xu Yang / Wenjin Yan / Yiqun Wang / Feng Yu / Jianting Zheng /
Abstract: In bacteria, principal σ factors (σ70 or σA) transcribe housekeeping genes required for cell viability. Although most principal σ genes are transcribed by the RNA polymerase (RNAP) holoenzyme ...In bacteria, principal σ factors (σ70 or σA) transcribe housekeeping genes required for cell viability. Although most principal σ genes are transcribed by the RNA polymerase (RNAP) holoenzyme containing the principal σ factor itself, an extracytoplasmic function (ECF) σ factor (σShbA) governs transcription of the principal σ factor gene (hrdB) in two model Streptomycetes. Here, we employed a combination of cryo-electron microscopy (cryo-EM) and bioinformatics to decipher how σShbA-RNAP holoenzymes govern the transcription of hrdB genes in Streptomyces. A cryo-EM structure of Streptomyces coelicolor σShbA-RNAP-promoter open (RPo) complex was solved at 2.97 Å resolution. In combination with in vitro transcription assays, we demonstrate the unique structural features used by the σShbA to recognize the hrdB promoter and form a transcription bubble. All Streptomyces genomes (603) tagged as 'reference' were retrieved from NCBI Datasets. The conserved protein sequences and genomic neighborhoods, as well as the promoter consensus sequences of σShbA and σHrdB homologs, support that the principal σHrdB being governed by the ECF σShbA is a common feature in Streptomyces. Overall, these results provide detailed molecular insights into the transcription of the principal σHrdB gene and pave the way for globally modulating Streptomyces cell viability.
History
DepositionMar 11, 2025Deposition site: PDBJ / Processing site: PDBJ
Revision 1.0May 14, 2025Provider: repository / Type: Initial release
Revision 1.0May 14, 2025Data content type: EM metadata / Data content type: EM metadata / Provider: repository / Type: Initial release
Revision 1.0May 14, 2025Data content type: FSC / Data content type: FSC / Provider: repository / Type: Initial release
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Revision 1.0May 14, 2025Data content type: Mask / Data content type: Mask / Provider: repository / Type: Initial release
Revision 1.0May 14, 2025Data content type: Primary map / Data content type: Primary map / Provider: repository / Type: Initial release
Revision 1.1Jun 18, 2025Group: Data collection / Category: em_admin / em_software / Item: _em_admin.last_update / _em_software.name
Revision 1.1Jun 18, 2025Data content type: EM metadata / Data content type: EM metadata / EM metadata / Group: Data processing / Experimental summary / Data content type: EM metadata / EM metadata / Category: em_admin / em_software / Data content type: EM metadata / EM metadata / Item: _em_admin.last_update / _em_software.name

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

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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'
F: ECF sigma factor
G: DNA (27-MER)
H: DNA (31-MER)
hetero molecules


Theoretical massNumber of molelcules
Total (without water)387,61110
Polymers387,4567
Non-polymers1553
Water00
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 subunit ... , 3 types, 4 molecules ABCD

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


Mass: 36734.641 Da / Num. of mol.: 2
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Streptomyces coelicolor A3(2) (bacteria)
Gene: rpoA, SCO4729, SC6G4.07 / Production host: Escherichia coli BL21(DE3) (bacteria) / References: UniProt: P60312, DNA-directed RNA polymerase
#2: Protein DNA-directed RNA polymerase subunit beta / RNAP subunit beta / RNA polymerase subunit beta / Transcriptase subunit beta


Mass: 128644.945 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Streptomyces coelicolor A3(2) (bacteria)
Gene: rpoB, SCO4654, SCD82.26 / Production host: Escherichia coli BL21(DE3) (bacteria) / References: UniProt: Q9L0L0, DNA-directed RNA polymerase
#3: Protein DNA-directed RNA polymerase subunit beta' / RNAP subunit beta' / RNA polymerase subunit beta' / Transcriptase subunit beta'


Mass: 144807.078 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Streptomyces coelicolor A3(2) (bacteria)
Gene: rpoC, SCO4655, SCD40A.01, SCD82.27 / Production host: Escherichia coli BL21(DE3) (bacteria) / References: UniProt: Q8CJT1, DNA-directed RNA polymerase

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Protein , 1 types, 1 molecules F

#4: Protein ECF sigma factor


Mass: 21357.314 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Streptomyces coelicolor A3(2) (bacteria)
Gene: SCO4769, SCD63.01 / Production host: Escherichia coli BL21(DE3) (bacteria) / References: UniProt: Q9L0I8

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DNA chain , 2 types, 2 molecules GH

#5: DNA chain DNA (27-MER)


Mass: 9602.186 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Streptomyces coelicolor A3(2) (bacteria)
Production host: Escherichia coli BL21(DE3) (bacteria)
#6: DNA chain DNA (31-MER)


Mass: 9575.145 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) Streptomyces coelicolor A3(2) (bacteria)
Production host: Escherichia coli BL21(DE3) (bacteria)

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Non-polymers , 2 types, 3 molecules

#7: Chemical ChemComp-MG / MAGNESIUM ION


Mass: 24.305 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: Mg / Feature type: SUBJECT OF INVESTIGATION
#8: Chemical ChemComp-ZN / ZINC ION


Mass: 65.409 Da / Num. of mol.: 2 / Source method: obtained synthetically / Formula: Zn / Feature type: SUBJECT OF INVESTIGATION

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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: Streptomyces coelicolor transcription initial complex / Type: COMPLEX / Entity ID: #1-#6 / Source: RECOMBINANT
Source (natural)Organism: Streptomyces coelicolor A3(2) (bacteria)
Source (recombinant)Organism: Escherichia coli BL21(DE3) (bacteria)
Buffer solutionpH: 7.5
SpecimenEmbedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
VitrificationCryogen name: ETHANE

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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: 1600 nm / Nominal defocus min: 1000 nm
Specimen holderSpecimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER
Image recordingElectron dose: 40 e/Å2 / Film or detector model: FEI FALCON IV (4k x 4k)
EM imaging opticsEnergyfilter name: GIF Bioquantum / Spherical aberration corrector: 2.7

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Processing

EM softwareName: PHENIX / Category: model refinement
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
3D reconstructionResolution: 3.61 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 85184 / Symmetry type: POINT
RefinementHighest resolution: 3.61 Å
Stereochemistry target values: REAL-SPACE (WEIGHTED MAP SUM AT ATOM CENTERS)
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.00424536
ELECTRON MICROSCOPYf_angle_d0.72733441
ELECTRON MICROSCOPYf_dihedral_angle_d14.6023779
ELECTRON MICROSCOPYf_chiral_restr0.0443798
ELECTRON MICROSCOPYf_plane_restr0.0064204

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