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- EMDB-27777: Streptomyces venezuelae RNAP transcription open promoter complex ... -
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Open data
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Basic information
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Title | Streptomyces venezuelae RNAP transcription open promoter complex with WhiA and WhiB transcription factors | |||||||||
![]() | Streptomyces venezuelae RNAP transcription open promoter complex with WhiA and WhiB transcription factors | |||||||||
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![]() | RNA polymerase / Transcription factor / Iron cluster / TRANSCRIPTION-TRANSFERASE-DNA complex | |||||||||
Function / homology | ![]() regulation of sporulation / dinitrosyl-iron complex binding / protein-disulfide reductase [NAD(P)H] activity / bacterial-type RNA polymerase core enzyme binding / sigma factor activity / DNA-directed RNA polymerase complex / cell redox homeostasis / DNA-templated transcription initiation / ribonucleoside binding / : ...regulation of sporulation / dinitrosyl-iron complex binding / protein-disulfide reductase [NAD(P)H] activity / bacterial-type RNA polymerase core enzyme binding / sigma factor activity / DNA-directed RNA polymerase complex / cell redox homeostasis / DNA-templated transcription initiation / ribonucleoside binding / : / : / : / : / : / : / DNA-directed RNA polymerase / 4 iron, 4 sulfur cluster binding / protein dimerization activity / cell division / negative regulation of DNA-templated transcription / positive regulation of DNA-templated transcription / magnesium ion binding / DNA binding / zinc ion binding / metal ion binding / cytoplasm Similarity search - Function | |||||||||
Biological species | ![]() | |||||||||
Method | single particle reconstruction / cryo EM / Resolution: 3.18 Å | |||||||||
![]() | Lilic M / Campbell EA | |||||||||
Funding support | ![]()
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![]() | ![]() Title: Structural basis of dual activation of cell division by the actinobacterial transcription factors WhiA and WhiB. Authors: Mirjana Lilic / Neil A Holmes / Matthew J Bush / Alexandra K Marti / David A Widdick / Kim C Findlay / Young Joo Choi / Ruby Froom / Steven Koh / Mark J Buttner / Elizabeth A Campbell / ![]() ![]() Abstract: Studies of transcriptional initiation in different bacterial clades reveal diverse molecular mechanisms regulating this first step in gene expression. The WhiA and WhiB factors are both required to ...Studies of transcriptional initiation in different bacterial clades reveal diverse molecular mechanisms regulating this first step in gene expression. The WhiA and WhiB factors are both required to express cell division genes in Actinobacteria and are essential in notable pathogens such as . The WhiA/B regulons and binding sites have been elucidated in (), where they coordinate to activate sporulation septation. However, how these factors cooperate at the molecular level is not understood. Here we present cryoelectron microscopy structures of transcriptional regulatory complexes comprising RNA polymerase (RNAP) σ-holoenzyme and WhiA and WhiB, in complex with the WhiA/B target promoter . These structures reveal that WhiB binds to domain 4 of σ (σ) of the σ-holoenzyme, bridging an interaction with WhiA while making non-specific contacts with the DNA upstream of the -35 core promoter element. The N-terminal homing endonuclease-like domain of WhiA interacts with WhiB, while the WhiA C-terminal domain (WhiA-CTD) makes base-specific contacts with the conserved WhiA GACAC motif. Notably, the structure of the WhiA-CTD and its interactions with the WhiA motif are strikingly similar to those observed between σ housekeeping σ-factors and the -35 promoter element, suggesting an evolutionary relationship. Structure-guided mutagenesis designed to disrupt these protein-DNA interactions reduces or abolishes developmental cell division in confirming their significance. Finally, we compare the architecture of the WhiA/B σ-holoenzyme promoter complex with the unrelated but model CAP Class I and Class II complexes, showing that WhiA/WhiB represent a new mechanism in bacterial transcriptional activation. | |||||||||
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Structure visualization
Supplemental images |
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Downloads & links
-EMDB archive
Map data | ![]() | 93.9 MB | ![]() | |
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Header (meta data) | ![]() ![]() | 29 KB 29 KB | Display Display | ![]() |
Images | ![]() | 124 KB | ||
Filedesc metadata | ![]() | 9 KB | ||
Others | ![]() ![]() | 95.6 MB 95.6 MB | ||
Archive directory | ![]() ![]() | HTTPS FTP |
-Validation report
Summary document | ![]() | 914.9 KB | Display | ![]() |
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Full document | ![]() | 914.5 KB | Display | |
Data in XML | ![]() | 13.6 KB | Display | |
Data in CIF | ![]() | 15.9 KB | Display | |
Arichive directory | ![]() ![]() | HTTPS FTP |
-Related structure data
Related structure data | ![]() 8dy7MC ![]() 8dy9C M: atomic model generated by this map C: citing same article ( |
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Similar structure data | Similarity search - Function & homology ![]() |
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Links
EMDB pages | ![]() ![]() |
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Related items in Molecule of the Month |
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Map
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Annotation | Streptomyces venezuelae RNAP transcription open promoter complex with WhiA and WhiB transcription factors | ||||||||||||||||||||||||||||||||||||
Projections & slices | Image control
Images are generated by Spider. | ||||||||||||||||||||||||||||||||||||
Voxel size | X=Y=Z: 1.083 Å | ||||||||||||||||||||||||||||||||||||
Density |
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Symmetry | Space group: 1 | ||||||||||||||||||||||||||||||||||||
Details | EMDB XML:
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-Supplemental data
-Half map: Half Map 1
File | emd_27777_half_map_1.map | ||||||||||||
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Annotation | Half Map 1 | ||||||||||||
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Density Histograms |
-Half map: Half Map 2
File | emd_27777_half_map_2.map | ||||||||||||
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Annotation | Half Map 2 | ||||||||||||
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Density Histograms |
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Sample components
+Entire : Streptomyces venezuelae RNAP transcription open promoter complex ...
+Supramolecule #1: Streptomyces venezuelae RNAP transcription open promoter complex ...
+Macromolecule #1: DNA-directed RNA polymerase subunit alpha
+Macromolecule #2: DNA-directed RNA polymerase subunit beta
+Macromolecule #3: DNA-directed RNA polymerase subunit beta'
+Macromolecule #4: DNA-directed RNA polymerase subunit omega
+Macromolecule #5: RNA polymerase sigma factor SigA
+Macromolecule #6: RNA polymerase-binding protein RbpA
+Macromolecule #7: Transcriptional regulator WhiB
+Macromolecule #8: Probable cell division protein WhiA
+Macromolecule #9: DNA (78-MER)
+Macromolecule #10: DNA (71-MER)
+Macromolecule #11: ZINC ION
+Macromolecule #12: MAGNESIUM ION
+Macromolecule #13: IRON/SULFUR CLUSTER
-Experimental details
-Structure determination
Method | cryo EM |
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![]() | single particle reconstruction |
Aggregation state | particle |
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Sample preparation
Buffer | pH: 8 |
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Vitrification | Cryogen name: ETHANE |
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Electron microscopy
Microscope | FEI TITAN KRIOS |
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Image recording | Film or detector model: GATAN K3 (6k x 4k) / Average electron dose: 51.44 e/Å2 |
Electron beam | Acceleration voltage: 300 kV / Electron source: ![]() |
Electron optics | Illumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD / Nominal defocus max: 2.5 µm / Nominal defocus min: 1.0 µm |
Experimental equipment | ![]() Model: Titan Krios / Image courtesy: FEI Company |
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Image processing
Startup model | Type of model: PDB ENTRY PDB model - PDB ID: |
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Final reconstruction | Resolution.type: BY AUTHOR / Resolution: 3.18 Å / Resolution method: FSC 0.143 CUT-OFF / Number images used: 184251 |
Initial angle assignment | Type: PROJECTION MATCHING |
Final angle assignment | Type: PROJECTION MATCHING |