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- EMDB-23008: Structure of SARS-CoV-2 backtracked complex complex bound to nsp1... -
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Basic information
Entry | Database: EMDB / ID: EMD-23008 | |||||||||
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Title | Structure of SARS-CoV-2 backtracked complex complex bound to nsp13 helicase - nsp13(2)-BTC | |||||||||
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![]() | RNA-dependent RNA polymerase / viral replication-transcription complex / transcription / viral proteins / TRANSFERASE-HYDROLASE-RNA complex | |||||||||
Function / homology | ![]() protein guanylyltransferase activity / RNA endonuclease activity producing 3'-phosphomonoesters, hydrolytic mechanism / mRNA guanylyltransferase activity / 5'-3' RNA helicase activity / Lyases; Phosphorus-oxygen lyases / Assembly of the SARS-CoV-2 Replication-Transcription Complex (RTC) / Maturation of replicase proteins / symbiont-mediated suppression of host cytoplasmic pattern recognition receptor signaling pathway via inhibition of TBK1 activity / ISG15-specific peptidase activity / Transcription of SARS-CoV-2 sgRNAs ...protein guanylyltransferase activity / RNA endonuclease activity producing 3'-phosphomonoesters, hydrolytic mechanism / mRNA guanylyltransferase activity / 5'-3' RNA helicase activity / Lyases; Phosphorus-oxygen lyases / Assembly of the SARS-CoV-2 Replication-Transcription Complex (RTC) / Maturation of replicase proteins / symbiont-mediated suppression of host cytoplasmic pattern recognition receptor signaling pathway via inhibition of TBK1 activity / ISG15-specific peptidase activity / Transcription of SARS-CoV-2 sgRNAs / TRAF3-dependent IRF activation pathway / Translation of Replicase and Assembly of the Replication Transcription Complex / Replication of the SARS-CoV-2 genome / snRNP Assembly / Hydrolases; Acting on ester bonds; Exoribonucleases producing 5'-phosphomonoesters / double membrane vesicle viral factory outer membrane / host cell endoplasmic reticulum-Golgi intermediate compartment / SARS coronavirus main proteinase / 3'-5'-RNA exonuclease activity / 5'-3' DNA helicase activity / host cell endosome / symbiont-mediated degradation of host mRNA / mRNA guanylyltransferase / symbiont-mediated suppression of host ISG15-protein conjugation / G-quadruplex RNA binding / symbiont-mediated suppression of host toll-like receptor signaling pathway / omega peptidase activity / symbiont-mediated suppression of host cytoplasmic pattern recognition receptor signaling pathway via inhibition of IRF3 activity / SARS-CoV-2 modulates host translation machinery / host cell Golgi apparatus / mRNA (guanine-N7)-methyltransferase / methyltransferase cap1 / symbiont-mediated perturbation of host ubiquitin-like protein modification / symbiont-mediated suppression of host NF-kappaB cascade / DNA helicase / methyltransferase cap1 activity / ubiquitinyl hydrolase 1 / cysteine-type deubiquitinase activity / mRNA 5'-cap (guanine-N7-)-methyltransferase activity / forked DNA-dependent helicase activity / single-stranded 3'-5' DNA helicase activity / four-way junction helicase activity / double-stranded DNA helicase activity / Hydrolases; Acting on peptide bonds (peptidases); Cysteine endopeptidases / single-stranded RNA binding / viral protein processing / host cell perinuclear region of cytoplasm / lyase activity / host cell endoplasmic reticulum membrane / RNA helicase / symbiont-mediated suppression of host type I interferon-mediated signaling pathway / copper ion binding / viral translational frameshifting / symbiont-mediated activation of host autophagy / RNA-directed RNA polymerase / chromatin extrusion motor activity / ATP-dependent H2AZ histone chaperone activity / cysteine-type endopeptidase activity / ATP-dependent H3-H4 histone complex chaperone activity / cohesin loader activity / viral RNA genome replication / DNA clamp loader activity / symbiont-mediated suppression of host gene expression / RNA-directed RNA polymerase activity / DNA-templated transcription / lipid binding / : / host cell nucleus / SARS-CoV-2 activates/modulates innate and adaptive immune responses / ATP hydrolysis activity / proteolysis / RNA binding / zinc ion binding / ATP binding / membrane Similarity search - Function | |||||||||
Biological species | ![]() ![]() | |||||||||
Method | single particle reconstruction / cryo EM / Resolution: 3.6 Å | |||||||||
![]() | Chen J / Malone B | |||||||||
Funding support | ![]()
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![]() | ![]() Title: Structural basis for backtracking by the SARS-CoV-2 replication-transcription complex. Authors: Brandon Malone / James Chen / Qi Wang / Eliza Llewellyn / Young Joo Choi / Paul Dominic B Olinares / Xinyun Cao / Carolina Hernandez / Edward T Eng / Brian T Chait / David E Shaw / Robert ...Authors: Brandon Malone / James Chen / Qi Wang / Eliza Llewellyn / Young Joo Choi / Paul Dominic B Olinares / Xinyun Cao / Carolina Hernandez / Edward T Eng / Brian T Chait / David E Shaw / Robert Landick / Seth A Darst / Elizabeth A Campbell / ![]() Abstract: Backtracking, the reverse motion of the transcriptase enzyme on the nucleic acid template, is a universal regulatory feature of transcription in cellular organisms but its role in viruses is not ...Backtracking, the reverse motion of the transcriptase enzyme on the nucleic acid template, is a universal regulatory feature of transcription in cellular organisms but its role in viruses is not established. Here we present evidence that backtracking extends into the viral realm, where backtracking by the severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) RNA-dependent RNA polymerase (RdRp) may aid viral transcription and replication. Structures of SARS-CoV-2 RdRp bound to the essential nsp13 helicase and RNA suggested the helicase facilitates backtracking. We use cryo-electron microscopy, RNA-protein cross-linking, and unbiased molecular dynamics simulations to characterize SARS-CoV-2 RdRp backtracking. The results establish that the single-stranded 3' segment of the product RNA generated by backtracking extrudes through the RdRp nucleoside triphosphate (NTP) entry tunnel, that a mismatched nucleotide at the product RNA 3' end frays and enters the NTP entry tunnel to initiate backtracking, and that nsp13 stimulates RdRp backtracking. Backtracking may aid proofreading, a crucial process for SARS-CoV-2 resistance against antivirals. | |||||||||
History |
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Structure visualization
Movie |
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Structure viewer | EM map: ![]() ![]() ![]() |
Supplemental images |
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Downloads & links
-EMDB archive
Map data | ![]() | 118 MB | ![]() | |
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Header (meta data) | ![]() ![]() | 20.1 KB 20.1 KB | Display Display | ![]() |
FSC (resolution estimation) | ![]() | 11.2 KB | Display | ![]() |
Images | ![]() | 58.9 KB | ||
Filedesc metadata | ![]() | 7.1 KB | ||
Others | ![]() | 105.2 MB | ||
Archive directory | ![]() ![]() | HTTPS FTP |
-Validation report
Summary document | ![]() | 515.9 KB | Display | ![]() |
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Full document | ![]() | 515.5 KB | Display | |
Data in XML | ![]() | 12.3 KB | Display | |
Data in CIF | ![]() | 16.4 KB | Display | |
Arichive directory | ![]() ![]() | HTTPS FTP |
-Related structure data
Related structure data | ![]() 7kroMC ![]() 7krnC ![]() 7krpC C: citing same article ( M: atomic model generated by this map |
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Similar structure data |
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Links
EMDB pages | ![]() ![]() |
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Related items in Molecule of the Month |
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Map
File | ![]() | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Projections & slices | Image control
Images are generated by Spider. | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Voxel size | X=Y=Z: 1.065 Å | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Density |
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Symmetry | Space group: 1 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Details | EMDB XML:
CCP4 map header:
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-Supplemental data
-Additional map: #1
File | emd_23008_additional_1.map | ||||||||||||
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Projections & Slices |
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Density Histograms |
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Sample components
+Entire : SARS-CoV-2 backtracked complex complex bound to nsp13 helicase - ...
+Supramolecule #1: SARS-CoV-2 backtracked complex complex bound to nsp13 helicase - ...
+Macromolecule #1: RNA-directed RNA polymerase
+Macromolecule #2: Non-structural protein 8
+Macromolecule #3: Non-structural protein 7
+Macromolecule #4: Helicase
+Macromolecule #5: RNA (37-MER)
+Macromolecule #6: RNA (43-MER)
+Macromolecule #7: ZINC ION
+Macromolecule #8: MAGNESIUM ION
+Macromolecule #9: ADENOSINE-5'-DIPHOSPHATE
+Macromolecule #10: CHAPSO
+Macromolecule #11: ALUMINUM FLUORIDE
-Experimental details
-Structure determination
Method | cryo EM |
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![]() | single particle reconstruction |
Aggregation state | particle |
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Sample preparation
Buffer | pH: 8 |
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Vitrification | Cryogen name: ETHANE |
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Electron microscopy
Microscope | FEI TITAN KRIOS |
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Image recording | Film or detector model: GATAN K3 (6k x 4k) / Average electron dose: 66.0 e/Å2 |
Electron beam | Acceleration voltage: 300 kV / Electron source: ![]() |
Electron optics | Illumination mode: FLOOD BEAM / Imaging mode: BRIGHT FIELD |
Experimental equipment | ![]() Model: Titan Krios / Image courtesy: FEI Company |