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- PDB-6pmi: Sigm28-transcription initiation complex with specific promoter at... -
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Basic information
Entry | Database: PDB / ID: 6pmi | ||||||
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Title | Sigm28-transcription initiation complex with specific promoter at the state 1 | ||||||
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![]() | TRANSCRIPTION / sigma28 / transcription initiation complex / RpoF / ZNR domain | ||||||
Function / homology | ![]() RNA polymerase complex / submerged biofilm formation / cellular response to cell envelope stress / cytosolic DNA-directed RNA polymerase complex / regulation of DNA-templated transcription initiation / sigma factor activity / bacterial-type flagellum assembly / bacterial-type flagellum-dependent cell motility / nitrate assimilation / DNA-directed RNA polymerase complex ...RNA polymerase complex / submerged biofilm formation / cellular response to cell envelope stress / cytosolic DNA-directed RNA polymerase complex / regulation of DNA-templated transcription initiation / sigma factor activity / bacterial-type flagellum assembly / bacterial-type flagellum-dependent cell motility / nitrate assimilation / DNA-directed RNA polymerase complex / transcription elongation factor complex / regulation of DNA-templated transcription elongation / transcription antitermination / DNA-templated transcription initiation / cell motility / ribonucleoside binding / DNA-directed 5'-3' RNA polymerase activity / DNA-directed RNA polymerase / response to heat / protein-containing complex assembly / intracellular iron ion homeostasis / protein dimerization activity / DNA-templated transcription / regulation of DNA-templated transcription / magnesium ion binding / DNA binding / zinc ion binding / membrane / cytoplasm / cytosol Similarity search - Function | ||||||
Biological species | ![]() ![]() ![]() ![]() ![]() ![]() | ||||||
Method | ELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.86 Å | ||||||
![]() | Liu, B. / Shi, W. | ||||||
![]() | ![]() Title: Structural basis of bacterial σ -mediated transcription reveals roles of the RNA polymerase zinc-binding domain. Authors: Wei Shi / Wei Zhou / Baoyue Zhang / Shaojia Huang / Yanan Jiang / Abigail Schammel / Yangbo Hu / Bin Liu / ![]() ![]() Abstract: In bacteria, σ is the flagella-specific sigma factor that targets RNA polymerase (RNAP) to control the expression of flagella-related genes involving bacterial motility and chemotaxis. However, the ...In bacteria, σ is the flagella-specific sigma factor that targets RNA polymerase (RNAP) to control the expression of flagella-related genes involving bacterial motility and chemotaxis. However, the structural mechanism of σ -dependent promoter recognition remains uncharacterized. Here, we report cryo-EM structures of E. coli σ -dependent transcribing complexes on a complete flagella-specific promoter. These structures reveal how σ -RNAP recognizes promoter DNA through strong interactions with the -10 element, but weak contacts with the -35 element, to initiate transcription. In addition, we observed a distinct architecture in which the β' zinc-binding domain (ZBD) of RNAP stretches out from its canonical position to interact with the upstream non-template strand. Further in vitro and in vivo assays demonstrate that this interaction has the overall effect of facilitating closed-to-open isomerization of the RNAP-promoter complex by compensating for the weak interaction between σ4 and -35 element. This suggests that ZBD relocation may be a general mechanism employed by σ family factors to enhance transcription from promoters with weak σ4/-35 element interactions. | ||||||
History |
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Structure visualization
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Structure viewer | Molecule: ![]() ![]() |
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PDBx/mmCIF format | ![]() | 1.2 MB | Display | ![]() |
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PDB format | ![]() | 962.6 KB | Display | ![]() |
PDBx/mmJSON format | ![]() | Tree view | ![]() | |
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-Validation report
Summary document | ![]() | 983.3 KB | Display | ![]() |
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Full document | ![]() | 1 MB | Display | |
Data in XML | ![]() | 95.1 KB | Display | |
Data in CIF | ![]() | 151.1 KB | Display | |
Arichive directory | ![]() ![]() | HTTPS FTP |
-Related structure data
Related structure data | ![]() 20394MC ![]() 6pmjC M: map data used to model this data C: citing same article ( |
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Similar structure data |
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Links
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Assembly
Deposited unit | ![]()
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Components
-DNA-directed RNA polymerase subunit ... , 4 types, 5 molecules ABCDE
#1: Protein | Mass: 36558.680 Da / Num. of mol.: 2 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() ![]() ![]() References: UniProt: P0A7Z6, UniProt: P0A7Z4*PLUS, DNA-directed RNA polymerase #2: Protein | | Mass: 150820.875 Da / Num. of mol.: 1 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() Strain: S88 / ExPEC / Gene: rpoB, ECS88_4448 / Production host: ![]() ![]() #3: Protein | | Mass: 155366.781 Da / Num. of mol.: 1 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() ![]() ![]() #4: Protein | | Mass: 10249.547 Da / Num. of mol.: 1 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() Strain: S88 / ExPEC / Gene: rpoZ, ECS88_4064 / Production host: ![]() ![]() References: UniProt: B7MFL0, UniProt: P0A800*PLUS, DNA-directed RNA polymerase |
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-DNA chain , 2 types, 2 molecules 12
#6: DNA chain | Mass: 16563.621 Da / Num. of mol.: 1 / Source method: obtained synthetically / Source: (synth.) ![]() ![]() |
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#7: DNA chain | Mass: 16759.771 Da / Num. of mol.: 1 / Source method: obtained synthetically / Source: (synth.) ![]() ![]() |
-Protein / RNA chain , 2 types, 2 molecules F3
#5: Protein | Mass: 28627.250 Da / Num. of mol.: 1 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() Strain: K12 / Gene: fliA, flaD, rpoF, b1922, JW1907 / Production host: ![]() ![]() |
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#8: RNA chain | Mass: 1078.596 Da / Num. of mol.: 1 / Source method: obtained synthetically / Source: (synth.) ![]() ![]() |
-Non-polymers , 2 types, 3 molecules ![](data/chem/img/ZN.gif)
![](data/chem/img/MG.gif)
![](data/chem/img/MG.gif)
#9: Chemical | #10: Chemical | ChemComp-MG / | |
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-Details
Has ligand of interest | Y |
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-Experimental details
-Experiment
Experiment | Method: ELECTRON MICROSCOPY |
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EM experiment | Aggregation state: PARTICLE / 3D reconstruction method: single particle reconstruction |
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Sample preparation
Component | Name: sigm28-transcription initiation complex with specific promoter at the state 1 Type: COMPLEX / Entity ID: #1-#8 / Source: RECOMBINANT | ||||||||||||||||||||
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Molecular weight | Value: 0.45 MDa / Experimental value: NO | ||||||||||||||||||||
Source (natural) | Organism: ![]() ![]() | ||||||||||||||||||||
Source (recombinant) | Organism: ![]() ![]() | ||||||||||||||||||||
Buffer solution | pH: 7.5 | ||||||||||||||||||||
Buffer component |
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Specimen | Conc.: 0.45 mg/ml / Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES | ||||||||||||||||||||
Specimen support | Details: 15mA / Grid material: COPPER / Grid mesh size: 200 divisions/in. / Grid type: Quantifoil R2/2 | ||||||||||||||||||||
Vitrification | Instrument: FEI VITROBOT MARK IV / Cryogen name: ETHANE / Humidity: 100 % / Chamber temperature: 277 K / Details: blot for 3 seconds before plunging |
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Electron microscopy imaging
Experimental equipment | ![]() Model: Titan Krios / Image courtesy: FEI Company |
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Microscopy | Model: FEI TITAN KRIOS Details: Direct alignments: Beam tilt pivot points, Beam shift, Comma Free. C2 aperture centering, C2 lens astigmatism correction. Objective aperture centering and objective lens astigmatism correction. |
Electron gun | Electron source: ![]() |
Electron lens | Mode: BRIGHT FIELD / Nominal magnification: 96000 X / Nominal defocus max: 2600 nm / Nominal defocus min: 1600 nm / Cs: 2.7 mm / C2 aperture diameter: 100 µm / Alignment procedure: BASIC |
Specimen holder | Cryogen: NITROGEN / Specimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER / Temperature (max): 77 K / Temperature (min): 77 K |
Image recording | Average exposure time: 30 sec. / Electron dose: 30 e/Å2 / Detector mode: COUNTING / Film or detector model: FEI FALCON III (4k x 4k) / Num. of grids imaged: 1 / Num. of real images: 4215 |
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Processing
EM software |
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CTF correction | Type: NONE | ||||||||||||||||||
Particle selection | Num. of particles selected: 1067697 | ||||||||||||||||||
Symmetry | Point symmetry: C1 (asymmetric) | ||||||||||||||||||
3D reconstruction | Resolution: 3.86 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 43838 / Symmetry type: POINT |