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- PDB-6qcv: Crystal structure of influenza B polymerase initiation state with... -
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Open data
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Basic information
Entry | Database: PDB / ID: 6qcv | |||||||||
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Title | Crystal structure of influenza B polymerase initiation state with capped 14-mer RNA primer and CTP | |||||||||
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![]() | VIRAL PROTEIN / RNA dependent RNA polymerase | |||||||||
Function / homology | ![]() cap snatching / viral transcription / symbiont-mediated suppression of host mRNA transcription via inhibition of RNA polymerase II activity / 7-methylguanosine mRNA capping / host cell mitochondrion / virion component / endonuclease activity / Hydrolases; Acting on ester bonds / host cell cytoplasm / viral translational frameshifting ...cap snatching / viral transcription / symbiont-mediated suppression of host mRNA transcription via inhibition of RNA polymerase II activity / 7-methylguanosine mRNA capping / host cell mitochondrion / virion component / endonuclease activity / Hydrolases; Acting on ester bonds / host cell cytoplasm / viral translational frameshifting / RNA-directed RNA polymerase / viral RNA genome replication / symbiont-mediated suppression of host gene expression / RNA-directed RNA polymerase activity / nucleotide binding / DNA-templated transcription / host cell nucleus / RNA binding / metal ion binding Similarity search - Function | |||||||||
Biological species | ![]() synthetic construct (others) | |||||||||
Method | ![]() ![]() ![]() | |||||||||
![]() | Cusack, S. / Drncova, P. | |||||||||
Funding support | European Union, ![]()
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![]() | ![]() Title: Structural snapshots of actively transcribing influenza polymerase. Authors: Tomas Kouba / Petra Drncová / Stephen Cusack / ![]() Abstract: Influenza virus RNA-dependent RNA polymerase uses unique mechanisms to transcribe its single-stranded genomic viral RNA (vRNA) into messenger RNA. The polymerase is initially bound to a promoter ...Influenza virus RNA-dependent RNA polymerase uses unique mechanisms to transcribe its single-stranded genomic viral RNA (vRNA) into messenger RNA. The polymerase is initially bound to a promoter comprising the partially base-paired 3' and 5' extremities of the RNA. A short, capped primer, 'cap-snatched' from a nascent host polymerase II transcript, is directed towards the polymerase active site to initiate RNA synthesis. Here we present structural snapshots, as determined by X-ray crystallography and cryo-electron microscopy, of actively initiating influenza polymerase as it transitions towards processive elongation. Unexpected conformational changes unblock the active site cavity to allow establishment of a nine-base-pair template-product RNA duplex before the strands separate into distinct exit channels. Concomitantly, as the template translocates, the promoter base pairs are broken and the template entry region is remodeled. These structures reveal details of the influenza polymerase active site that will help optimize nucleoside analogs or other compounds that directly inhibit viral RNA synthesis. | |||||||||
History |
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Structure visualization
Structure viewer | Molecule: ![]() ![]() |
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Downloads & links
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Download
PDBx/mmCIF format | ![]() | 959.4 KB | Display | ![]() |
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PDB format | ![]() | 794.3 KB | Display | ![]() |
PDBx/mmJSON format | ![]() | Tree view | ![]() | |
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-Validation report
Summary document | ![]() | 802.3 KB | Display | ![]() |
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Full document | ![]() | 823.9 KB | Display | |
Data in XML | ![]() | 71.7 KB | Display | |
Data in CIF | ![]() | 99.3 KB | Display | |
Arichive directory | ![]() ![]() | HTTPS FTP |
-Related structure data
Related structure data | ![]() 4511C ![]() 4512C ![]() 6qcsC ![]() 6qctC ![]() 6qcwC ![]() 6qcxC ![]() 5msgS S: Starting model for refinement C: citing same article ( |
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Similar structure data |
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Assembly
Deposited unit | ![]()
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Unit cell |
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Components
-Protein , 3 types, 3 molecules ABC
#1: Protein | Mass: 85822.781 Da / Num. of mol.: 1 Source method: isolated from a genetically manipulated source Details: N-terminal His-tag C-terminal linker and TEV site / Source: (gene. exp.) ![]() ![]() References: UniProt: Q5V8Z9, Hydrolases; Acting on ester bonds |
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#2: Protein | Mass: 86207.016 Da / Num. of mol.: 1 Source method: isolated from a genetically manipulated source Details: N-terminal linker C-terminal linker and TEV site / Source: (gene. exp.) ![]() ![]() |
#3: Protein | Mass: 90844.109 Da / Num. of mol.: 1 Source method: isolated from a genetically manipulated source Details: N-terminal linker C-terminal STREP tag and TEV site Source: (gene. exp.) ![]() ![]() |
-RNA chain , 3 types, 3 molecules MRV
#4: RNA chain | Mass: 4936.968 Da / Num. of mol.: 1 / Source method: obtained synthetically / Details: Capped RNA / Source: (synth.) synthetic construct (others) |
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#5: RNA chain | Mass: 6525.820 Da / Num. of mol.: 1 / Source method: obtained synthetically / Details: 3' end of vRNA promoter (extended) / Source: (synth.) synthetic construct (others) |
#6: RNA chain | Mass: 4557.820 Da / Num. of mol.: 1 / Source method: obtained synthetically / Details: 5' end of vRNA promoter / Source: (synth.) synthetic construct (others) |
-Non-polymers , 3 types, 3 molecules 




#7: Chemical | ChemComp-PO4 / |
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#8: Chemical | ChemComp-CTP / |
#9: Chemical | ChemComp-MG / |
-Experimental details
-Experiment
Experiment | Method: ![]() |
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Sample preparation
Crystal | Density Matthews: 5.31 Å3/Da / Density % sol: 76.85 % / Description: marquise shaped |
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Crystal grow | Temperature: 277 K / Method: vapor diffusion, hanging drop / pH: 4.4 Details: Influenza B polymerase at 9 mg per ml in was mixed with 40 microM vRNA 5 prime end 14-mer, 40 microM vRNA 3 prime end 21-mer and 80 microM 14-mer capped RNA. The mother liquor contained 200 ...Details: Influenza B polymerase at 9 mg per ml in was mixed with 40 microM vRNA 5 prime end 14-mer, 40 microM vRNA 3 prime end 21-mer and 80 microM 14-mer capped RNA. The mother liquor contained 200 mM di-ammonium phosphate and 100 mM sodium acetate between pH 4.0 and 4.4. CTP was soaked for 18 hours into grown crystals at a final concentration of 5 mM in the drop. |
-Data collection
Diffraction | Mean temperature: 100 K / Serial crystal experiment: N |
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Diffraction source | Source: ![]() ![]() ![]() |
Detector | Type: DECTRIS PILATUS 6M-F / Detector: PIXEL / Date: Aug 24, 2018 |
Radiation | Protocol: SINGLE WAVELENGTH / Monochromatic (M) / Laue (L): M / Scattering type: x-ray |
Radiation wavelength | Wavelength: 0.977 Å / Relative weight: 1 |
Reflection | Resolution: 3.24→50 Å / Num. obs: 64019 / % possible obs: 67.9 % / Redundancy: 6.9 % / CC1/2: 0.996 / Rmerge(I) obs: 0.175 / Rrim(I) all: 0.189 / Net I/σ(I): 7.6 |
Reflection shell | Resolution: 3.24→3.48 Å / Redundancy: 7.3 % / Rmerge(I) obs: 1.19 / Mean I/σ(I) obs: 1.5 / CC1/2: 0.65 / Rrim(I) all: 1.28 / % possible all: 60.8 |
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Processing
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Refinement | Method to determine structure: ![]() Starting model: 5MSG Resolution: 3.24→50 Å / Cor.coef. Fo:Fc: 0.815 / Cor.coef. Fo:Fc free: 0.905 / SU B: 55.338 / SU ML: 0.381 / Cross valid method: THROUGHOUT / ESU R Free: 0.486 / Details: HYDROGENS HAVE BEEN ADDED IN THE RIDING POSITIONS
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Solvent computation | Ion probe radii: 0.8 Å / Shrinkage radii: 0.8 Å / VDW probe radii: 1.2 Å | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Displacement parameters | Biso mean: 116.801 Å2
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Refinement step | Cycle: 1 / Resolution: 3.24→50 Å
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Refine LS restraints |
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