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Open data
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Basic information
Entry | ![]() | |||||||||
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Title | Influenza A/H7N9 polymerase elongation complex | |||||||||
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Function / homology | ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() Similarity search - Function | |||||||||
Biological species | ![]() ![]() ![]() ![]() ![]() | |||||||||
Method | ![]() ![]() | |||||||||
![]() | Cusack S / Kouba T | |||||||||
Funding support | ![]()
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![]() | ![]() Title: Direct observation of backtracking by influenza A and B polymerases upon consecutive incorporation of the nucleoside analog T1106. Authors: Tomas Kouba / Anna Dubankova / Petra Drncova / Elisa Donati / Pietro Vidossich / Valentina Speranzini / Alex Pflug / Johanna Huchting / Chris Meier / Marco De Vivo / Stephen Cusack / ![]() ![]() ![]() Abstract: The antiviral pseudo-base T705 and its de-fluoro analog T1106 mimic adenine or guanine and can be competitively incorporated into nascent RNA by viral RNA-dependent RNA polymerases. Although ...The antiviral pseudo-base T705 and its de-fluoro analog T1106 mimic adenine or guanine and can be competitively incorporated into nascent RNA by viral RNA-dependent RNA polymerases. Although dispersed, single pseudo-base incorporation is mutagenic, consecutive incorporation causes polymerase stalling and chain termination. Using a template encoding single and then consecutive T1106 incorporation four nucleotides later, we obtained a cryogenic electron microscopy structure of stalled influenza A/H7N9 polymerase. This shows that the entire product-template duplex backtracks by 5 nt, bringing the singly incorporated T1106 to the +1 position, where it forms an unexpected T1106:U wobble base pair. Similar structures show that influenza B polymerase also backtracks after consecutive T1106 incorporation, regardless of whether prior single incorporation has occurred. These results give insight into the unusual mechanism of chain termination by pyrazinecarboxamide base analogs. Consecutive incorporation destabilizes the proximal end of the product-template duplex, promoting irreversible backtracking to a more energetically favorable overall configuration. | |||||||||
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Structure visualization
Supplemental images |
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Downloads & links
-EMDB archive
Map data | ![]() | 159.6 MB | ![]() | |
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Header (meta data) | ![]() ![]() | 23.5 KB 23.5 KB | Display Display | ![]() |
FSC (resolution estimation) | ![]() | 15.5 KB | Display | ![]() |
Images | ![]() | 120.1 KB | ||
Others | ![]() ![]() ![]() | 304.3 MB 260.1 MB 259.8 MB | ||
Archive directory | ![]() ![]() | HTTPS FTP |
-Related structure data
Related structure data | ![]() 7qtlMC ![]() 7r0eC ![]() 7r1fC ![]() 7zplC ![]() 7zpmC ![]() 8bdrC ![]() 8be0C ![]() 8bekC ![]() 8bf5C 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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Map
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Annotation | LocScale filtered map | ||||||||||||||||||||||||||||||||||||
Projections & slices | Image control
Images are generated by Spider. | ||||||||||||||||||||||||||||||||||||
Voxel size | X=Y=Z: 0.8127 Å | ||||||||||||||||||||||||||||||||||||
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Symmetry | Space group: 1 | ||||||||||||||||||||||||||||||||||||
Details | EMDB XML:
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-Supplemental data
-Additional map: RELION post-processed map
File | emd_14144_additional_1.map | ||||||||||||
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Annotation | RELION post-processed map | ||||||||||||
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-Half map: #1
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Density Histograms |
-Half map: #2
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Sample components
+Entire : A/H7N9-Elongation
+Supramolecule #1: A/H7N9-Elongation
+Macromolecule #1: Polymerase acidic protein
+Macromolecule #2: RNA-directed RNA polymerase catalytic subunit
+Macromolecule #3: Polymerase basic protein 2
+Macromolecule #4: 5' vRNA
+Macromolecule #5: 3' vRNA
+Macromolecule #6: mRNA
+Macromolecule #7: 5'-O-[(S)-hydroxy{[(S)-hydroxy(phosphonooxy)phosphoryl]methyl}pho...
+Macromolecule #8: MAGNESIUM ION
+Macromolecule #9: P1-7-METHYLGUANOSINE-P3-ADENOSINE-5',5'-TRIPHOSPHATE
+Macromolecule #10: water
-Experimental details
-Structure determination
Method | ![]() |
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Aggregation state | particle |
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Sample preparation
Buffer | pH: 7.4 |
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Vitrification | Cryogen name: ETHANE |
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Electron microscopy
Microscope | FEI TITAN KRIOS |
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Electron beam | Acceleration voltage: 300 kV / Electron source: ![]() |
Electron optics | Illumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD![]() |
Image recording | Film or detector model: GATAN K2 QUANTUM (4k x 4k) / Average electron dose: 33.4 e/Å2 |
Experimental equipment | ![]() Model: Titan Krios / Image courtesy: FEI Company |
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Image processing
-Atomic model buiding 1
Refinement | Space: REAL |
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Output model | ![]() PDB-7qtl: |