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- PDB-8opb: Virus-like Particle based on PVY coat protein with RNA-free helic... -

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Basic information

Entry
Database: PDB / ID: 8opb
TitleVirus-like Particle based on PVY coat protein with RNA-free helical architecture
ComponentsGenome polyprotein (Fragment)
KeywordsVIRUS LIKE PARTICLE / helical / RNA-free / VLP / Potyvirus / PVY
Function / homologyPotyvirus coat protein / Potyvirus coat protein / viral capsid / Genome polyprotein
Function and homology information
Biological speciesPotato virus Y strain NTN
MethodELECTRON MICROSCOPY / helical reconstruction / cryo EM / Resolution: 3.58 Å
AuthorsKavcic, L. / Kezar, A. / Podobnik, M.
Funding support Slovenia, 2items
OrganizationGrant numberCountry
Slovenian Research AgencyP1-0391 Slovenia
Slovenian Research AgencyJ7-7248 Slovenia
CitationJournal: Commun Chem / Year: 2024
Title: From structural polymorphism to structural metamorphosis of the coat protein of flexuous filamentous potato virus Y.
Authors: Luka Kavčič / Andreja Kežar / Neža Koritnik / Magda Tušek Žnidarič / Tajda Klobučar / Žiga Vičič / Franci Merzel / Ellie Holden / Justin L P Benesch / Marjetka Podobnik /
Abstract: The structural diversity and tunability of the capsid proteins (CPs) of various icosahedral and rod-shaped viruses have been well studied and exploited in the development of smart hybrid ...The structural diversity and tunability of the capsid proteins (CPs) of various icosahedral and rod-shaped viruses have been well studied and exploited in the development of smart hybrid nanoparticles. However, the potential of CPs of the wide-spread flexuous filamentous plant viruses remains to be explored. Here, we show that we can control the shape, size, RNA encapsidation ability, symmetry, stability and surface functionalization of nanoparticles through structure-based design of CP from potato virus Y (PVY). We provide high-resolution insight into CP-based self-assemblies, ranging from large polymorphic or monomorphic filaments to smaller annular, cubic or spherical particles. Furthermore, we show that we can prevent CP self-assembly in bacteria by fusion with a cleavable protein, enabling controlled nanoparticle formation in vitro. Understanding the remarkable structural diversity of PVY CP not only provides possibilities for the production of biodegradable nanoparticles, but may also advance future studies of CP's polymorphism in a biological context.
History
DepositionApr 7, 2023Deposition site: PDBE / Processing site: PDBE
Revision 1.0Feb 14, 2024Provider: repository / Type: Initial release

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Structure visualization

Structure viewerMolecule:
MolmilJmol/JSmol

Downloads & links

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Assembly

Deposited unit
Aa: Genome polyprotein (Fragment)
Ab: Genome polyprotein (Fragment)
Ac: Genome polyprotein (Fragment)
Ad: Genome polyprotein (Fragment)
Ae: Genome polyprotein (Fragment)
Af: Genome polyprotein (Fragment)
Ag: Genome polyprotein (Fragment)
Ah: Genome polyprotein (Fragment)
Ai: Genome polyprotein (Fragment)
Aj: Genome polyprotein (Fragment)
Ak: Genome polyprotein (Fragment)
Al: Genome polyprotein (Fragment)
Am: Genome polyprotein (Fragment)
An: Genome polyprotein (Fragment)
Ao: Genome polyprotein (Fragment)
Ap: Genome polyprotein (Fragment)


Theoretical massNumber of molelcules
Total (without water)478,97316
Polymers478,97316
Non-polymers00
Water00
1


  • Idetical with deposited unit
  • defined by author&software
TypeNameSymmetry operationNumber
identity operation1_555x,y,z1
Buried area60980 Å2
ΔGint-314 kcal/mol
Surface area154620 Å2

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Components

#1: Protein
Genome polyprotein (Fragment)


Mass: 29935.797 Da / Num. of mol.: 16
Source method: isolated from a genetically manipulated source
Details: Due to flexibility, structural model could only be built from H42 to A222.
Source: (gene. exp.) Potato virus Y strain NTN / Strain: NTN / Plasmid: pT7-7 / Production host: Escherichia coli BL21(DE3) (bacteria) / References: UniProt: A0A0A7DIV0

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Experimental details

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Experiment

ExperimentMethod: ELECTRON MICROSCOPY
EM experimentAggregation state: FILAMENT / 3D reconstruction method: helical reconstruction

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Sample preparation

ComponentName: Virus-like particle from PVY coat protein / Type: COMPLEX / Details: The sample contains 3 forms of filaments. / Entity ID: all / Source: RECOMBINANT
Molecular weightExperimental value: NO
Source (natural)Organism: Potato virus Y strain NTN
Source (recombinant)Organism: Escherichia coli (E. coli) / Strain: BL21 (DE3) / Plasmid: pT7-7
Buffer solutionpH: 7.4
Details: 1.8 mM KH2PO4, 10.1 mM Na2HPO4, 140 mM NaCl, 2.7 mM KCl, pH 7.4
SpecimenConc.: 1 mg/ml / Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
Specimen supportGrid material: COPPER / Grid mesh size: 200 divisions/in. / Grid type: Quantifoil R2/2
VitrificationCryogen name: ETHANE

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Electron microscopy imaging

MicroscopyModel: TFS GLACIOS
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 200 kV / Illumination mode: OTHER
Electron lensMode: BRIGHT FIELD / Nominal magnification: 150000 X / Nominal defocus max: 2100 nm / Nominal defocus min: 800 nm
Specimen holderCryogen: NITROGEN
Image recordingElectron dose: 40 e/Å2 / Detector mode: COUNTING / Film or detector model: FEI FALCON III (4k x 4k) / Num. of real images: 502

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Processing

EM software
IDNameVersionCategoryDetails
1cryoSPARC3.3particle selectionFilament tracer
4cryoSPARC3.3CTF correction
7Cootmodel fitting
9PHENIXmodel refinement
10cryoSPARC4.1initial Euler assignment
13cryoSPARC4.13D reconstruction
CTF correctionDetails: patchCTF correction / Type: PHASE FLIPPING AND AMPLITUDE CORRECTION
Helical symmertyAngular rotation/subunit: -48.107 ° / Axial rise/subunit: 5.876 Å / Axial symmetry: C1
Particle selectionNum. of particles selected: 109796 / Details: cryosparc filament tracer
3D reconstructionResolution: 3.58 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 27500
Details: cryoSPARC Helical refinement with initial helical parameters from Ab initio model and helical layer lines
Symmetry type: HELICAL
Atomic model buildingPDB-ID: 6HXX

6hxx


Pdb chain-ID: A / Accession code: 6HXX / Source name: PDB / Type: experimental model

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