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Yorodumi- PDB-5zju: Crystal structure of in vitro expressed and assembled PCV2 Virus-... -
+Open data
-Basic information
Entry | Database: PDB / ID: 5zju | ||||||
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Title | Crystal structure of in vitro expressed and assembled PCV2 Virus-like Particle | ||||||
Components | Capsid protein | ||||||
Keywords | VIRUS / PCV2 capsid protein | ||||||
Function / homology | Function and homology information viral capsid assembly / T=1 icosahedral viral capsid / viral penetration into host nucleus / symbiont entry into host cell / virion attachment to host cell Similarity search - Function | ||||||
Biological species | Porcine circovirus 2 | ||||||
Method | X-RAY DIFFRACTION / SYNCHROTRON / MOLECULAR REPLACEMENT / Resolution: 2.8 Å | ||||||
Authors | Yuan, Y.A. / Mo, X. | ||||||
Citation | Journal: PLoS Pathog / Year: 2019 Title: Structural roles of PCV2 capsid protein N-terminus in PCV2 particle assembly and identification of PCV2 type-specific neutralizing epitope. Authors: Xiaobing Mo / Xiangdong Li / Bo Yin / Junhua Deng / Kegong Tian / Adam Yuan / Abstract: Postweaning multisystemic wasting disease (PMWS) in piglets caused by porcine circovirus type 2 (PCV2) is one of the major threats to most pig farms worldwide. Among all the PCV types, PCV2 is the ...Postweaning multisystemic wasting disease (PMWS) in piglets caused by porcine circovirus type 2 (PCV2) is one of the major threats to most pig farms worldwide. Among all the PCV types, PCV2 is the dominant genotype causing PMWS and associated diseases. Considerable efforts were made to study the virus-like-particle (VLP) assembly and the specific PCV2-associated epitope(s) in order to establish the solid foundation for engineered PCV2 vaccine development. Although the N-terminal fragment including Nuclear Localization Signal (NLS) sequence seems important for recombinant PCV2 capsid protein expression and VLP assembly, the detailed structural and functional information regarding this important fragment are largely unknown. In this study, we report crystal structure of PCV2 VLP assembled from N-terminal NLS truncated PCV2 capsid protein at 2.8 Å resolution and cryo-EM structure of PCV2 VLP assembled from full-length PCV2 capsid protein at 4.1Å resolution. Our in vitro PCV2 VLP assembly results show that NLS-truncated PCV2 capsid protein only forms instable VLPs which were easily disassembled in solution, whereas full-length PCV2 capsid protein forms stable VLPs due to interaction between 15PRSHLGQILRRRP27 (α-helix) and 33RHRYRWRRKN42 (NLS-B) in a repeated manner. In addition, our results also showed that N-terminal truncation of PCV2 capsid protein up to 27 residues still forms PCV2 particles in solution with similar size and immunogenicity, while N-terminal truncation of PCV2 capsid protein with more than 30 residues is not able to form stable PCV2 particles in solution, demonstrating the importance of interaction between the α-helix at N-terminal and NLS-B in PCV2 VLP formation. Moreover, we also report the cryo-EM structure of PCV2 VLP in complex with 3H11-Fab, a PCV2 type-specific neutralizing antibody, at 15 Å resolution. MAb-3H11 specifically recognizes one exposed epitope located on the VLP surface EF-loop (residues 128-143), which is further confirmed by PCV1-PCV2 epitope swapping assay. Hence, our results have revealed the structural roles of N-terminal fragment of PCV2 capsid protein in PCV2 particle assembly and pinpointed one PCV2 type-specific neutralizing epitope for the first time, which could provide clear clue for next generation PCV2 vaccine and diagnostic kits development. | ||||||
History |
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-Structure visualization
Structure viewer | Molecule: MolmilJmol/JSmol |
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-Downloads & links
-Download
PDBx/mmCIF format | 5zju.cif.gz | 4.4 MB | Display | PDBx/mmCIF format |
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PDB format | pdb5zju.ent.gz | 3.7 MB | Display | PDB format |
PDBx/mmJSON format | 5zju.json.gz | Tree view | PDBx/mmJSON format | |
Others | Other downloads |
-Validation report
Summary document | 5zju_validation.pdf.gz | 896.8 KB | Display | wwPDB validaton report |
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Full document | 5zju_full_validation.pdf.gz | 1003.5 KB | Display | |
Data in XML | 5zju_validation.xml.gz | 410 KB | Display | |
Data in CIF | 5zju_validation.cif.gz | 579.7 KB | Display | |
Arichive directory | https://data.pdbj.org/pub/pdb/validation_reports/zj/5zju ftp://data.pdbj.org/pub/pdb/validation_reports/zj/5zju | HTTPS FTP |
-Related structure data
Related structure data | 6746C 6961C 5zboC 3r0rS S: Starting model for refinement C: citing same article (ref.) |
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Similar structure data |
-Links
-Assembly
Deposited unit |
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1 |
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Unit cell |
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-Components
#1: Protein | Mass: 24126.051 Da / Num. of mol.: 60 Source method: isolated from a genetically manipulated source Source: (gene. exp.) Porcine circovirus 2 / Gene: cap / Plasmid: pET / Production host: Escherichia coli (E. coli) / References: UniProt: G0Y2B2 #2: Water | ChemComp-HOH / | |
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-Experimental details
-Experiment
Experiment | Method: X-RAY DIFFRACTION / Number of used crystals: 1 |
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-Sample preparation
Crystal | Density Matthews: 3.13 Å3/Da / Density % sol: 60.71 % |
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Crystal grow | Temperature: 293 K / Method: vapor diffusion, hanging drop / Details: Ammonium sulfate, Citrate |
-Data collection
Diffraction | Mean temperature: 100 K |
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Diffraction source | Source: SYNCHROTRON / Site: NSRRC / Beamline: BL17A / Wavelength: 1 Å |
Detector | Type: MAR CCD 165 mm / Detector: CCD / Date: Mar 26, 2016 |
Radiation | Protocol: SINGLE WAVELENGTH / Monochromatic (M) / Laue (L): M / Scattering type: x-ray |
Radiation wavelength | Wavelength: 1 Å / Relative weight: 1 |
Reflection | Resolution: 2.8→50 Å / Num. obs: 432268 / % possible obs: 99.4 % / Redundancy: 3.8 % / Net I/σ(I): 13.5 |
Reflection shell | Resolution: 2.8→2.85 Å / Mean I/σ(I) obs: 2.31 |
-Processing
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Refinement | Method to determine structure: MOLECULAR REPLACEMENT Starting model: 3r0r Resolution: 2.8→50 Å / Cor.coef. Fo:Fc: 0.954 / Cor.coef. Fo:Fc free: 0.912 / SU B: 26.017 / SU ML: 0.223 / Cross valid method: THROUGHOUT / ESU R: 1.035 / ESU R Free: 0.312 / Details: HYDROGENS HAVE BEEN ADDED IN THE RIDING POSITIONS
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Solvent computation | Ion probe radii: 0.8 Å / Shrinkage radii: 0.8 Å / VDW probe radii: 1.2 Å | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
Displacement parameters | Biso mean: 42.029 Å2
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Refinement step | Cycle: 1 / Resolution: 2.8→50 Å
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Refine LS restraints |
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