5IBV

Crystal Structure of Human Astrovirus capsid protein

  • Classification: VIRAL PROTEIN
  • Organism(s): Human astrovirus 8
  • Expression System: Escherichia coli
  • Mutation(s): No 

  • Deposited: 2016-02-22 Released: 2016-08-03 
  • Deposition Author(s): Tao, Y.J., Toh, Y.S.
  • Funding Organization(s): National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID), Welch Foundation

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.15 Å
  • R-Value Free: 0.246 
  • R-Value Work: 0.209 
  • R-Value Observed: 0.213 

wwPDB Validation   3D Report Full Report


This is version 1.4 of the entry. See complete history


Literature

Crystal Structure of the Human Astrovirus Capsid Protein.

Toh, Y.Harper, J.Dryden, K.A.Yeager, M.Arias, C.F.Mendez, E.Tao, Y.J.

(2016) J Virol 90: 9008-9017

  • DOI: 10.1128/JVI.00694-16
  • Primary Citation of Related Structures:  
    5IBV

  • PubMed Abstract: 
  • Human astrovirus (HAstV) is a leading cause of viral diarrhea in infants and young children worldwide. HAstV is a nonenveloped virus with a T=3 capsid and a positive-sense RNA genome. The capsid protein (CP) of HAstV is synthesized as a 90-kDa precursor (VP90) that can be divided into three linear domains: a conserved N-terminal domain, a hypervariable domain, and an acidic C-terminal domain ...

    Human astrovirus (HAstV) is a leading cause of viral diarrhea in infants and young children worldwide. HAstV is a nonenveloped virus with a T=3 capsid and a positive-sense RNA genome. The capsid protein (CP) of HAstV is synthesized as a 90-kDa precursor (VP90) that can be divided into three linear domains: a conserved N-terminal domain, a hypervariable domain, and an acidic C-terminal domain. Maturation of HAstV requires proteolytic processing of the astrovirus CP both inside and outside the host cell, resulting in the removal of the C-terminal domain and the breakdown of the rest of the CP into three predominant protein species with molecular masses of ∼34, 27/29, and 25/26 kDa, respectively. We have now solved the crystal structure of VP90(71-415) (amino acids [aa] 71 to 415 of VP90) of human astrovirus serotype 8 at a 2.15-Å resolution. VP90(71-415) encompasses the conserved N-terminal domain of VP90 but lacks the hypervariable domain, which forms the capsid surface spikes. The structure of VP90(71-415) is comprised of two domains: an S domain, which adopts the typical jelly-roll β-barrel fold, and a P1 domain, which forms a squashed β-barrel consisting of six antiparallel β-strands similar to what was observed in the hepatitis E virus (HEV) capsid structure. Fitting of the VP90(71-415) structure into the cryo-electron microscopy (EM) maps of HAstV produced an atomic model for a continuous, T=3 icosahedral capsid shell. Our pseudoatomic model of the human HAstV capsid shell provides valuable insights into intermolecular interactions required for capsid assembly and trypsin-mediated proteolytic maturation needed for virus infectivity. Such information has potential applications in the development of a virus-like particle (VLP) vaccine as well as small-molecule drugs targeting astrovirus assembly/maturation.


    Organizational Affiliation

    Department of BioSciences, Rice University, Houston, Texas, USA ytao@rice.edu.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Capsid polyprotein VP90A354Human astrovirus 8Mutation(s): 0 
Gene Names: ORF2
Find proteins for Q9IFX1 (Human astrovirus-8)
Explore Q9IFX1 
Go to UniProtKB:  Q9IFX1
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
MSE
Query on MSE
AL-PEPTIDE LINKINGC5 H11 N O2 SeMET
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.15 Å
  • R-Value Free: 0.246 
  • R-Value Work: 0.209 
  • R-Value Observed: 0.213 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 51.983α = 90
b = 59.236β = 91.45
c = 56.197γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
HKL-2000data scaling
PHASESphasing

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data

  • Deposited Date: 2016-02-22 
  • Released Date: 2016-08-03 
  • Deposition Author(s): Tao, Y.J., Toh, Y.S.

Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)United StatesAI103777
Welch FoundationUnited StatesC-1565

Revision History  (Full details and data files)

  • Version 1.0: 2016-08-03
    Type: Initial release
  • Version 1.1: 2016-08-10
    Changes: Database references
  • Version 1.2: 2016-10-12
    Changes: Database references
  • Version 1.3: 2017-09-20
    Changes: Author supporting evidence, Database references, Derived calculations, Refinement description
  • Version 1.4: 2019-12-11
    Changes: Author supporting evidence