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Yorodumi- PDB-6x7f: Cryo-EM structure of an Escherichia coli coupled transcription-tr... -
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Basic information
| Entry | Database: PDB / ID: 6x7f | ||||||
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| Title | Cryo-EM structure of an Escherichia coli coupled transcription-translation complex B2 (TTC-B2) containing an mRNA with a 24 nt long spacer, transcription factors NusA and NusG, and fMet-tRNAs at P-site and E-site | ||||||
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 Keywords | RIBOSOME / TRANSCRIPTION/TRANSLATION / coupled transcription-translation complex / TRANSCRIPTION / TRANSCRIPTION-TRANSLATION complex | ||||||
| Function / homology |  Function and homology informationtranscription elongation-coupled chromatin remodeling / positive regulation of ribosome biogenesis / DnaA-L2 complex / negative regulation of DNA-templated DNA replication initiation / DNA-directed RNA polymerase complex / assembly of large subunit precursor of preribosome / regulation of DNA-templated transcription elongation / cytosolic ribosome assembly / transcription antitermination / regulation of cell growth ...transcription elongation-coupled chromatin remodeling / positive regulation of ribosome biogenesis / DnaA-L2 complex / negative regulation of DNA-templated DNA replication initiation / DNA-directed RNA polymerase complex / assembly of large subunit precursor of preribosome / regulation of DNA-templated transcription elongation / cytosolic ribosome assembly / transcription antitermination / regulation of cell growth / DNA-templated transcription termination / mRNA 5'-UTR binding / ribonucleoside binding / DNA-directed RNA polymerase / DNA-directed RNA polymerase activity / ribosome biogenesis / large ribosomal subunit / ribosome binding / transferase activity / small ribosomal subunit / 5S rRNA binding / small ribosomal subunit rRNA binding / ribosomal large subunit assembly / cytosolic small ribosomal subunit / large ribosomal subunit rRNA binding / cytosolic large ribosomal subunit / cytoplasmic translation / tRNA binding / protein dimerization activity / rRNA binding / structural constituent of ribosome / ribosome / translation / DNA-binding transcription factor activity / ribonucleoprotein complex / nucleotide binding / mRNA binding / DNA-templated transcription / magnesium ion binding / DNA binding / RNA binding / zinc ion binding / metal ion binding / cytoplasm / cytosol Similarity search - Function  | ||||||
| Biological species | ![]() synthetic construct (others)  | ||||||
| Method | ELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.5 Å | ||||||
 Authors | Molodtsov, V. / Ebright, R.H. / Wang, C. / Su, M. | ||||||
| Funding support |   United States, 1items 
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 Citation |  Journal: Science / Year: 2020Title: Structural basis of transcription-translation coupling. Authors: Chengyuan Wang / Vadim Molodtsov / Emre Firlar / Jason T Kaelber / Gregor Blaha / Min Su / Richard H Ebright / ![]() Abstract: In bacteria, transcription and translation are coupled processes in which the movement of RNA polymerase (RNAP)-synthesizing messenger RNA (mRNA) is coordinated with the movement of the first ...In bacteria, transcription and translation are coupled processes in which the movement of RNA polymerase (RNAP)-synthesizing messenger RNA (mRNA) is coordinated with the movement of the first ribosome-translating mRNA. Coupling is modulated by the transcription factors NusG (which is thought to bridge RNAP and the ribosome) and NusA. Here, we report cryo-electron microscopy structures of transcription-translation complexes (TTCs) containing different-length mRNA spacers between RNAP and the ribosome active-center P site. Structures of TTCs containing short spacers show a state incompatible with NusG bridging and NusA binding (TTC-A, previously termed "expressome"). Structures of TTCs containing longer spacers reveal a new state compatible with NusG bridging and NusA binding (TTC-B) and reveal how NusG bridges and NusA binds. We propose that TTC-B mediates NusG- and NusA-dependent transcription-translation coupling.  | ||||||
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Structure visualization
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| Structure viewer | Molecule:  Molmil Jmol/JSmol | 
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Downloads & links
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Download
| PDBx/mmCIF format |  6x7f.cif.gz | 6.6 MB | Display |  PDBx/mmCIF format | 
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| PDB format |  pdb6x7f.ent.gz | Display |  PDB format | |
| PDBx/mmJSON format |  6x7f.json.gz | Tree view |  PDBx/mmJSON format | |
| Others |  Other downloads | 
-Validation report
| Summary document |  6x7f_validation.pdf.gz | 1.5 MB | Display |  wwPDB validaton report | 
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| Full document |  6x7f_full_validation.pdf.gz | 1.6 MB | Display | |
| Data in XML |  6x7f_validation.xml.gz | 294.2 KB | Display | |
| Data in CIF |  6x7f_validation.cif.gz | 510.2 KB | Display | |
| Arichive directory |  https://data.pdbj.org/pub/pdb/validation_reports/x7/6x7f ftp://data.pdbj.org/pub/pdb/validation_reports/x7/6x7f | HTTPS FTP  | 
-Related structure data
| Related structure data | ![]() 22084MC ![]() 6vu3C ![]() 6vyqC ![]() 6vyrC ![]() 6vysC ![]() 6vytC ![]() 6vyuC ![]() 6vywC ![]() 6vyxC ![]() 6vyyC ![]() 6vyzC ![]() 6vz2C ![]() 6vz3C ![]() 6vz5C ![]() 6vz7C ![]() 6vzjC ![]() 6x6tC ![]() 6x7kC ![]() 6x9qC ![]() 6xdqC ![]() 6xdrC ![]() 6xgfC ![]() 6xiiC ![]() 6xijC 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
+50S ribosomal protein  ... , 32 types, 32 molecules 012349YZbcefghijklmnopqrstuvwxyz                               
-DNA chain , 2 types, 2 molecules 56 
| #6: DNA chain |   Mass: 11042.110 Da / Num. of mol.: 1 / Source method: obtained synthetically / Source: (synth.) synthetic construct (others)  | 
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| #7: DNA chain |   Mass: 10956.012 Da / Num. of mol.: 1 / Source method: obtained synthetically / Source: (synth.) synthetic construct (others)  | 
-RNA chain , 5 types, 6 molecules 7ABDad     
| #8: RNA chain |   Mass: 12912.316 Da / Num. of mol.: 1 / Source method: obtained synthetically / Source: (synth.) synthetic construct (others)  | ||||||
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| #10: RNA chain | Mass: 24496.617 Da / Num. of mol.: 2 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() #18: RNA chain |   | Mass: 499690.031 Da / Num. of mol.: 1 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() #41: RNA chain |   | Mass: 941635.438 Da / Num. of mol.: 1 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() #44: RNA chain |   | Mass: 38790.090 Da / Num. of mol.: 1 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]()  | 
-DNA-directed RNA polymerase subunit  ... , 4 types, 5 molecules AAACADAEAF    
| #11: Protein |   Mass: 150820.875 Da / Num. of mol.: 1 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]()  | ||||
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| #13: Protein | Mass: 36558.680 Da / Num. of mol.: 2 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() References: UniProt: A0A073G207, DNA-directed RNA polymerase #14: Protein |   | Mass: 155366.781 Da / Num. of mol.: 1 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() References: UniProt: A0A4S1NBU2, DNA-directed RNA polymerase #15: Protein |   | Mass: 10249.547 Da / Num. of mol.: 1 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]()  | 
-Transcription termination/antitermination protein  ... , 2 types, 2 molecules ABAG 
| #12: Protein |   Mass: 20560.523 Da / Num. of mol.: 1 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]()  | 
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| #16: Protein |   Mass: 54932.684 Da / Num. of mol.: 1 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]()  | 
+30S ribosomal protein  ... , 21 types, 21 molecules CEFGHIJKLMNOPQRSTUVWX                    
-Non-polymers , 2 types, 3 molecules 


| #67: Chemical |  ChemComp-MG /  | 
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| #68: Chemical | 
-Details
| Has ligand of interest | N | 
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| Has protein modification | Y | 
-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: Cryo-EM structure of an Escherichia coli coupled transcription-translation complex B2 (TTC-B2) containing an mRNA with a 24 nt long spacer, transcription factors NusA and NusG, and fMet-tRNAs at P-site and E-site Type: COMPLEX / Entity ID: #1-#66 / Source: RECOMBINANT  | 
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| Molecular weight | Experimental value: NO | 
| Source (natural) | Organism: ![]()  | 
| Source (recombinant) | Organism: ![]()  | 
| Buffer solution | pH: 7.6 | 
| Specimen | Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES | 
| Vitrification | Cryogen name: ETHANE | 
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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 | 
| Electron gun | Electron source:  FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: FLOOD BEAM | 
| Electron lens | Mode: BRIGHT FIELD | 
| Image recording | Electron dose: 45 e/Å2 / 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: 3.5 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 45450 / Symmetry type: POINT | 
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