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- PDB-6y6k: Cryo-EM structure of a Phenuiviridae L protein -

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Basic information

Entry
Database: PDB / ID: 6y6k
TitleCryo-EM structure of a Phenuiviridae L protein
ComponentsRNA-dependent RNA polymerase
KeywordsVIRAL PROTEIN / Bunyavirus / Phenuiviridae / L protein / viral polymerase / cap-snatching
Function / homology
Function and homology information


host cell endoplasmic reticulum / virion component / host cell endoplasmic reticulum-Golgi intermediate compartment / host cell Golgi apparatus / Hydrolases; Acting on ester bonds / hydrolase activity / RNA-directed RNA polymerase / viral RNA genome replication / RNA-dependent RNA polymerase activity / DNA-templated transcription / metal ion binding
Similarity search - Function
RNA-directed RNA polymerase L, PA-C-like domain / RNA-directed RNA polymerase L, PA-C-like domain / RNA-directed RNA polymerase L, N-terminal / L protein N-terminus / RNA-dependent RNA polymerase, bunyaviral / Bunyavirus RNA dependent RNA polymerase / RNA-directed RNA polymerase, negative-strand RNA virus / RdRp of negative ssRNA viruses with segmented genomes catalytic domain profile.
Similarity search - Domain/homology
RNA-directed RNA polymerase L
Similarity search - Component
Biological speciesSFTS virus AH12
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.78 Å
AuthorsVogel, D. / Thorkelsson, S.R. / Quemin, E. / Meier, K. / Kouba, T. / Gogrefe, N. / Busch, C. / Reindl, S. / Guenther, S. / Cusack, S. ...Vogel, D. / Thorkelsson, S.R. / Quemin, E. / Meier, K. / Kouba, T. / Gogrefe, N. / Busch, C. / Reindl, S. / Guenther, S. / Cusack, S. / Gruenewald, K. / Rosenthal, M.
Funding support Germany, 2items
OrganizationGrant numberCountry
Leibniz AssociationK27/2017 Germany
German Research Foundation (DFG)INST 152/777-1 FUGG Germany
Citation
Journal: Nucleic Acids Res / Year: 2020
Title: Structural and functional characterization of the severe fever with thrombocytopenia syndrome virus L protein.
Authors: Dominik Vogel / Sigurdur Rafn Thorkelsson / Emmanuelle R J Quemin / Kristina Meier / Tomas Kouba / Nadja Gogrefe / Carola Busch / Sophia Reindl / Stephan Günther / Stephen Cusack / Kay ...Authors: Dominik Vogel / Sigurdur Rafn Thorkelsson / Emmanuelle R J Quemin / Kristina Meier / Tomas Kouba / Nadja Gogrefe / Carola Busch / Sophia Reindl / Stephan Günther / Stephen Cusack / Kay Grünewald / Maria Rosenthal /
Abstract: The Bunyavirales order contains several emerging viruses with high epidemic potential, including Severe fever with thrombocytopenia syndrome virus (SFTSV). The lack of medical countermeasures, such ...The Bunyavirales order contains several emerging viruses with high epidemic potential, including Severe fever with thrombocytopenia syndrome virus (SFTSV). The lack of medical countermeasures, such as vaccines and antivirals, is a limiting factor for the containment of any virus outbreak. To develop such antivirals a profound understanding of the viral replication process is essential. The L protein of bunyaviruses is a multi-functional and multi-domain protein performing both virus transcription and genome replication and, therefore, is an ideal drug target. We established expression and purification procedures for the full-length L protein of SFTSV. By combining single-particle electron cryo-microscopy and X-ray crystallography, we obtained 3D models covering ∼70% of the SFTSV L protein in the apo-conformation including the polymerase core region, the endonuclease and the cap-binding domain. We compared this first L structure of the Phenuiviridae family to the structures of La Crosse peribunyavirus L protein and influenza orthomyxovirus polymerase. Together with a comprehensive biochemical characterization of the distinct functions of SFTSV L protein, this work provides a solid framework for future structural and functional studies of L protein-RNA interactions and the development of antiviral strategies against this group of emerging human pathogens.
#1: Journal: Acta Crystallogr D Struct Biol / Year: 2018
Title: Real-space refinement in PHENIX for cryo-EM and crystallography.
Authors: Pavel V Afonine / Billy K Poon / Randy J Read / Oleg V Sobolev / Thomas C Terwilliger / Alexandre Urzhumtsev / Paul D Adams /
Abstract: This article describes the implementation of real-space refinement in the phenix.real_space_refine program from the PHENIX suite. The use of a simplified refinement target function enables very fast ...This article describes the implementation of real-space refinement in the phenix.real_space_refine program from the PHENIX suite. The use of a simplified refinement target function enables very fast calculation, which in turn makes it possible to identify optimal data-restraint weights as part of routine refinements with little runtime cost. Refinement of atomic models against low-resolution data benefits from the inclusion of as much additional information as is available. In addition to standard restraints on covalent geometry, phenix.real_space_refine makes use of extra information such as secondary-structure and rotamer-specific restraints, as well as restraints or constraints on internal molecular symmetry. The re-refinement of 385 cryo-EM-derived models available in the Protein Data Bank at resolutions of 6 Å or better shows significant improvement of the models and of the fit of these models to the target maps.
#2: Journal: J Struct Biol / Year: 2012
Title: RELION: implementation of a Bayesian approach to cryo-EM structure determination.
Authors: Sjors H W Scheres /
Abstract: RELION, for REgularized LIkelihood OptimizatioN, is an open-source computer program for the refinement of macromolecular structures by single-particle analysis of electron cryo-microscopy (cryo-EM) ...RELION, for REgularized LIkelihood OptimizatioN, is an open-source computer program for the refinement of macromolecular structures by single-particle analysis of electron cryo-microscopy (cryo-EM) data. Whereas alternative approaches often rely on user expertise for the tuning of parameters, RELION uses a Bayesian approach to infer parameters of a statistical model from the data. This paper describes developments that reduce the computational costs of the underlying maximum a posteriori (MAP) algorithm, as well as statistical considerations that yield new insights into the accuracy with which the relative orientations of individual particles may be determined. A so-called gold-standard Fourier shell correlation (FSC) procedure to prevent overfitting is also described. The resulting implementation yields high-quality reconstructions and reliable resolution estimates with minimal user intervention and at acceptable computational costs.
History
DepositionFeb 26, 2020Deposition site: PDBE / Processing site: PDBE
Revision 1.0Apr 8, 2020Provider: repository / Type: Initial release
Revision 1.1Apr 29, 2020Group: Database references / Category: citation / citation_author
Item: _citation.country / _citation.journal_abbrev ..._citation.country / _citation.journal_abbrev / _citation.journal_id_ASTM / _citation.journal_id_CSD / _citation.journal_id_ISSN / _citation.pdbx_database_id_DOI / _citation.pdbx_database_id_PubMed / _citation.title / _citation.year / _citation_author.name
Revision 1.2Jun 10, 2020Group: Database references / Category: citation
Item: _citation.journal_volume / _citation.page_first / _citation.page_last
Revision 1.3May 22, 2024Group: Data collection / Database references / Category: chem_comp_atom / chem_comp_bond / database_2
Item: _database_2.pdbx_DOI / _database_2.pdbx_database_accession

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Structure visualization

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Assembly

Deposited unit
A: RNA-dependent RNA polymerase
hetero molecules


Theoretical massNumber of molelcules
Total (without water)235,7672
Polymers235,7431
Non-polymers241
Water00
1


  • Idetical with deposited unit
  • defined by author&software
  • Evidence: gel filtration
TypeNameSymmetry operationNumber
identity operation1_5551
Buried area120 Å2
ΔGint-8 kcal/mol
Surface area60910 Å2
MethodPISA

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Components

#1: Protein RNA-dependent RNA polymerase


Mass: 235742.531 Da / Num. of mol.: 1
Source method: isolated from a genetically manipulated source
Source: (gene. exp.) SFTS virus AH12 / Production host: Escherichia coli (E. coli) / References: UniProt: F1BV96
#2: Chemical ChemComp-MG / MAGNESIUM ION


Mass: 24.305 Da / Num. of mol.: 1 / Source method: obtained synthetically / Formula: Mg / Feature type: SUBJECT OF INVESTIGATION
Has ligand of interestY

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Experimental details

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Experiment

ExperimentMethod: ELECTRON MICROSCOPY
EM experimentAggregation state: PARTICLE / 3D reconstruction method: single particle reconstruction

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Sample preparation

ComponentName: Severe Fever with Thrombocytopenia Syndrome Virus L Protein
Type: COMPLEX / Entity ID: #1 / Source: RECOMBINANT
Molecular weightValue: 0.238 MDa / Experimental value: NO
Source (natural)Organism: SFTS virus AH12
Source (recombinant)Organism: Escherichia coli (E. coli)
Buffer solutionpH: 7
Buffer component
IDConc.NameFormulaBuffer-ID
120 mMHEPESC8H18N2O4S1
2500 mMsodium chlorideNaCl1
320 mMmagnesium chlorideMgCl1
SpecimenConc.: 0.15 mg/ml / Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
Specimen supportDetails: Harrick Plasma cleaner / Grid type: Quantifoil R2/1
VitrificationInstrument: FEI VITROBOT MARK IV / Cryogen name: ETHANE-PROPANE / Humidity: 100 % / Chamber temperature: 277.15 K / Details: Blot for 2s using blotting force -10

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Electron microscopy imaging

Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company
MicroscopyModel: TFS KRIOS
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: FLOOD BEAM
Electron lensMode: BRIGHT FIELD / Nominal magnification: 105000 X / Nominal defocus max: 3000 nm / Nominal defocus min: 500 nm / Cs: 2.7 mm / C2 aperture diameter: 70 µm / Alignment procedure: BASIC
Specimen holderCryogen: NITROGEN / Specimen holder model: FEI TITAN KRIOS AUTOGRID HOLDER
Image recordingAverage exposure time: 3 sec. / Electron dose: 59.45 e/Å2 / Film or detector model: GATAN K3 (6k x 4k) / Num. of grids imaged: 1 / Num. of real images: 2626
EM imaging opticsEnergyfilter name: GIF Bioquantum / Energyfilter slit width: 20 eV

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Processing

Software
NameVersionClassification
phenix.real_space_refine1.17_3644refinement
PHENIX1.17_3644refinement
EM software
IDNameVersionCategory
2EPU1.Ximage acquisition
3Warp1.0.7image acquisition
4RELION3image acquisition
6Gctf1.18CTF correction
11RELION3initial Euler assignment
12RELION3final Euler assignment
13RELION3classification
14RELION33D reconstruction
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
Particle selectionNum. of particles selected: 780000
Details: Particles were picked with Warp's pretrained agent BoxNet2Mask_20180918
SymmetryPoint symmetry: C1 (asymmetric)
3D reconstructionResolution: 3.78 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 220000 / Algorithm: FOURIER SPACE / Num. of class averages: 1 / Symmetry type: POINT
Atomic model buildingB value: 225.217 / Protocol: AB INITIO MODEL / Space: REAL
RefinementCross valid method: NONE
Stereochemistry target values: GeoStd + Monomer Library + CDL v1.2
Displacement parametersBiso mean: 64.75 Å2
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.011710568
ELECTRON MICROSCOPYf_angle_d0.981814272
ELECTRON MICROSCOPYf_chiral_restr0.06011585
ELECTRON MICROSCOPYf_plane_restr0.00581821
ELECTRON MICROSCOPYf_dihedral_angle_d22.16753936

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