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- PDB-8r6u: Structure of the SFTSV L protein in a transcription-priming state... -
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Open data
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Basic information
Entry | Database: PDB / ID: 8r6u | ||||||||||||
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Title | Structure of the SFTSV L protein in a transcription-priming state without capped RNA [TRANSCRIPTION-PRIMING (in vitro)] | ||||||||||||
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![]() | VIRAL PROTEIN / SFTSV / RNA-DEPENDENT RNA POLYMERASE / VIRAL RNA | ||||||||||||
Function / homology | ![]() host cell endoplasmic reticulum / host cell endoplasmic reticulum-Golgi intermediate compartment / host cell Golgi apparatus / RNA-directed RNA polymerase / viral RNA genome replication / RNA-dependent RNA polymerase activity / DNA-templated transcription / metal ion binding Similarity search - Function | ||||||||||||
Biological species | ![]() | ||||||||||||
Method | ELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 2.98 Å | ||||||||||||
![]() | Williams, H.M. / Thorkelsson, S.R. / Vogel, D. / Busch, C. / Milewski, M. / Cusack, S. / Grunewald, K. / Quemin, E.R.J. / Rosenthal, M. | ||||||||||||
Funding support | ![]()
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![]() | ![]() Title: Structural snapshots of phenuivirus cap-snatching and transcription. Authors: Harry M Williams / Sigurdur R Thorkelsson / Dominik Vogel / Carola Busch / Morlin Milewski / Stephen Cusack / Kay Grünewald / Emmanuelle R J Quemin / Maria Rosenthal / ![]() ![]() Abstract: Severe fever with thrombocytopenia syndrome virus (SFTSV) is a human pathogen that is now endemic to several East Asian countries. The viral large (L) protein catalyzes viral transcription by ...Severe fever with thrombocytopenia syndrome virus (SFTSV) is a human pathogen that is now endemic to several East Asian countries. The viral large (L) protein catalyzes viral transcription by stealing host mRNA caps via a process known as cap-snatching. Here, we establish an in vitro cap-snatching assay and present three high-quality electron cryo-microscopy (cryo-EM) structures of the SFTSV L protein in biologically relevant, transcription-specific states. In a priming-state structure, we show capped RNA bound to the L protein cap-binding domain (CBD). The L protein conformation in this priming structure is significantly different from published replication-state structures, in particular the N- and C-terminal domains. The capped-RNA is positioned in a way that it can feed directly into the RNA-dependent RNA polymerase (RdRp) ready for elongation. We also captured the L protein in an early-elongation state following primer-incorporation demonstrating that this priming conformation is retained at least in the very early stages of primer extension. This structural data is complemented by in vitro biochemical and cell-based assays. Together, these insights further our mechanistic understanding of how SFTSV and other bunyaviruses incorporate stolen host mRNA fragments into their viral transcripts thereby allowing the virus to hijack host cell translation machinery. #1: ![]() Title: Structural snapshots of phenuivirus cap-snatching and transcription Authors: Williams, H.M. / Thorkelsson, S.R. / Vogel, D. / Busch, C. / Milewski, M. / Cusack, S. / Grunewald, K. / Quemin, E.R.J. / Rosenthal, M. | ||||||||||||
History |
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Structure visualization
Structure viewer | Molecule: ![]() ![]() |
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Downloads & links
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Download
PDBx/mmCIF format | ![]() | 356.5 KB | Display | ![]() |
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PDB format | ![]() | 273.9 KB | Display | ![]() |
PDBx/mmJSON format | ![]() | Tree view | ![]() | |
Others | ![]() |
-Validation report
Summary document | ![]() | 1.5 MB | Display | ![]() |
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Full document | ![]() | 1.5 MB | Display | |
Data in XML | ![]() | 56 KB | Display | |
Data in CIF | ![]() | 86.4 KB | Display | |
Arichive directory | ![]() ![]() | HTTPS FTP |
-Related structure data
Related structure data | ![]() 18963MC ![]() 8r6wC ![]() 8r6yC C: citing same article ( M: map data used to model this data |
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Similar structure data | Similarity search - Function & homology ![]() |
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Links
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Assembly
Deposited unit | ![]()
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Components
#1: Protein | Mass: 235698.500 Da / Num. of mol.: 1 / Mutation: D112A Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() | ||||||||
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#2: RNA chain | Mass: 6451.975 Da / Num. of mol.: 2 / Source method: obtained synthetically / Details: Synthesised by ChemGenes and Biomers. / Source: (synth.) ![]() #3: RNA chain | | Mass: 8386.002 Da / Num. of mol.: 1 / Source method: obtained synthetically / Details: Synthesised by Biomers. / Source: (synth.) ![]() #4: RNA chain | | Mass: 5094.191 Da / Num. of mol.: 1 / Source method: obtained synthetically Details: Chain G is tail-end of primer. Seq is different to P: 5-AAAACGCAACCAACAC-3. Because the ACAC is shared though it collapses into a single sequence in the system, can this be changed manually? Source: (synth.) ![]() #5: Chemical | ChemComp-MG / | Has ligand of interest | 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: SFTSV L protein in complex with 5' and 3' RNA, as well as RNA acting as a primer. Type: COMPLEX Details: SFTSV L protein expressed recombinantly in complex with several RNA species. Entity ID: #1-#3 / Source: RECOMBINANT |
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Molecular weight | Value: 0.24 MDa / Experimental value: YES |
Source (natural) | Organism: ![]() |
Source (recombinant) | Organism: ![]() |
Buffer solution | pH: 7 |
Specimen | Conc.: 0.8 mg/ml / Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES / Details: This sample was monodisperse. |
Specimen support | Film material: CARBON / Grid material: GOLD / Grid type: Quantifoil R2/1 |
Vitrification | Instrument: FEI VITROBOT MARK IV / Cryogen name: ETHANE-PROPANE / Humidity: 100 % / Chamber temperature: 277 K |
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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: ![]() |
Electron lens | Mode: BRIGHT FIELD / Nominal magnification: 105000 X / Nominal defocus max: 2600 nm / Nominal defocus min: 800 nm / Cs: 2.7 mm |
Specimen holder | Cryogen: NITROGEN |
Image recording | Electron dose: 50 e/Å2 / Film or detector model: GATAN K3 BIOQUANTUM (6k x 4k) / Num. of real images: 4701 |
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Processing
EM software |
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CTF correction | Type: PHASE FLIPPING AND AMPLITUDE CORRECTION | ||||||||||||||||||||||||||||||
Particle selection | Num. of particles selected: 1908653 | ||||||||||||||||||||||||||||||
3D reconstruction | Resolution: 2.98 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 67479 / Symmetry type: POINT | ||||||||||||||||||||||||||||||
Atomic model building | Protocol: RIGID BODY FIT / Target criteria: Cross-correlation coefficient | ||||||||||||||||||||||||||||||
Refine LS restraints |
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