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- PDB-7dy6: A refined cryo-EM structure of an Escherichia coli RNAP-promoter ... -
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Open data
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Basic information
Entry | Database: PDB / ID: 7dy6 | ||||||
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Title | A refined cryo-EM structure of an Escherichia coli RNAP-promoter open complex (RPo) with SspA | ||||||
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![]() | TRANSCRIPTION / bacterial RNA polymerase / Complex | ||||||
Function / homology | ![]() glutathione dehydrogenase (ascorbate) activity / L-ascorbic acid metabolic process / sigma factor antagonist 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 / response to starvation / bacterial-type flagellum assembly ...glutathione dehydrogenase (ascorbate) activity / L-ascorbic acid metabolic process / sigma factor antagonist 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 / response to starvation / bacterial-type flagellum assembly / glutathione transferase activity / bacterial-type flagellum-dependent cell motility / nitrate assimilation / glutathione metabolic process / 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 / intracellular iron ion homeostasis / protein dimerization activity / response to antibiotic / negative regulation of DNA-templated transcription / DNA-templated transcription / positive 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: 3.68 Å | ||||||
![]() | Lin, W. | ||||||
![]() | ![]() Title: A unique binding between SspA and RNAP βNTH across low-GC Gram-negative bacteria facilitates SspA-mediated transcription regulation. Authors: Fulin Wang / Yu Feng / Zhuo Shang / Wei Lin / ![]() Abstract: Stringent starvation protein A (SspA) involved in nucleotide metabolism, acid tolerance and virulence of bacteria has been demonstrated to function as a transcription factor to regulate σ-dependent ...Stringent starvation protein A (SspA) involved in nucleotide metabolism, acid tolerance and virulence of bacteria has been demonstrated to function as a transcription factor to regulate σ-dependent gene transcription through interacting with σ region 4 and the zinc binding domain (ZBD) of E. coli RNA polymerase (EcoRNAP) β' subunit simultaneously. Despite extensive biochemical and structural analyses were reported recently, the interactions of SspA with RNAP are not comprehensively understood. Here, we reprocessed our previous cryo-EM dataset of EcoRNAP-promoter open complex with SspA (SspA-RPo) and obtained a significantly improved density map. Unexpectedly, the new map showed that SspA interacts with both N-terminal helix of β' subunit (β'ΝΤΗ) and ω subunit, which contributes to stabilize the SspA-EcoRNAP σ holoenzyme complex. Sequence alignments and phylogenetic tree analyses of N-terminal sequences of β' subunit from different classes of bacteria revealed that β'ΝΤΗ is highly conserved and exclusively found in low-GC-content Gram-negative bacteria that harbor SspA, implying a co-evolution of β'ΝΤΗ and SspA. The transcription assays of wild-type SspA and its mutants demonstrated the interaction between SspA and β'ΝΤΗ facilitates the transcription regulation of SspA. Together, our results provide a more comprehensive insight into the interactions between SspA and RNAP and their roles in bacterial transcription regulation. | ||||||
History |
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Structure visualization
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Structure viewer | Molecule: ![]() ![]() |
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PDBx/mmCIF format | ![]() | 804.5 KB | Display | ![]() |
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PDB format | ![]() | 640.8 KB | Display | ![]() |
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-Validation report
Summary document | ![]() | 1.1 MB | Display | ![]() |
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Full document | ![]() | 1.3 MB | Display | |
Data in XML | ![]() | 134.5 KB | Display | |
Data in CIF | ![]() | 201.7 KB | Display | |
Arichive directory | ![]() ![]() | HTTPS FTP |
-Related structure data
Related structure data | ![]() 30914MC 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 chain , 2 types, 2 molecules HG
#1: DNA chain | Mass: 19671.666 Da / Num. of mol.: 1 / Source method: obtained synthetically / Source: (synth.) ![]() ![]() |
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#7: DNA chain | Mass: 19159.285 Da / Num. of mol.: 1 / Source method: obtained synthetically / Source: (synth.) ![]() ![]() |
-Protein , 2 types, 3 molecules IJF
#2: Protein | Mass: 24332.885 Da / Num. of mol.: 2 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() Gene: sspA, pog, ssp, b3229, JW3198 Production host: ![]() ![]() References: UniProt: P0ACA3 #6: Protein | | Mass: 70352.242 Da / Num. of mol.: 1 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() Gene: rpoD, alt, b3067, JW3039 Production host: ![]() ![]() References: UniProt: P00579 |
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-DNA-directed RNA polymerase subunit ... , 4 types, 6 molecules KABCDE
#3: Protein | Mass: 36558.680 Da / Num. of mol.: 3 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() Gene: rpoA, FAZ83_23195 Production host: ![]() ![]() References: UniProt: A0A4S5AL01, DNA-directed RNA polymerase #4: Protein | | Mass: 150804.922 Da / Num. of mol.: 1 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() Gene: rpoB, groN, nitB, rif, ron, stl, stv, tabD, b3987, JW3950 Production host: ![]() ![]() References: UniProt: P0A8V2, DNA-directed RNA polymerase #5: Protein | | Mass: 155366.781 Da / Num. of mol.: 1 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() Gene: rpoC, tabB, b3988, JW3951 Production host: ![]() ![]() References: UniProt: P0A8T7, DNA-directed RNA polymerase #8: Protein | | Mass: 10249.547 Da / Num. of mol.: 1 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() Gene: rpoZ, FAZ83_19385 Production host: ![]() ![]() References: UniProt: A0A4S5AUM4, DNA-directed RNA polymerase |
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-Non-polymers , 2 types, 3 molecules ![](data/chem/img/MG.gif)
![](data/chem/img/ZN.gif)
![](data/chem/img/ZN.gif)
#9: Chemical | ChemComp-MG / |
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#10: Chemical |
-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: an Escherichia coli RNAP-promoter open complex (RPo) with SspA Type: CELL / Entity ID: #1-#8 / Source: RECOMBINANT |
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Source (natural) | Organism: ![]() ![]() |
Source (recombinant) | Organism: ![]() ![]() |
Buffer solution | pH: 7.9 |
Specimen | Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES |
Specimen support | Grid material: COPPER |
Vitrification | Cryogen name: ETHANE |
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Electron microscopy imaging
Microscopy | Model: FEI/PHILIPS CM300FEG/T |
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Electron gun | Electron source: ![]() |
Electron lens | Mode: BRIGHT FIELD |
Image recording | Electron dose: 59 e/Å2 / Detector mode: COUNTING / Film or detector model: GATAN K2 SUMMIT (4k x 4k) |
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Processing
CTF correction | Type: PHASE FLIPPING AND AMPLITUDE CORRECTION |
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3D reconstruction | Resolution: 3.68 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 60145 / Symmetry type: POINT |