3QSQ

Crystal structure of the projection domain of the human astrovirus capsid protein


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.80 Å
  • R-Value Free: 0.215 
  • R-Value Work: 0.180 
  • R-Value Observed: 0.181 

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This is version 1.1 of the entry. See complete history


Literature

Crystal structure of the human astrovirus capsid spike.

Dong, J.Dong, L.Mendez, E.Tao, Y.

(2011) Proc Natl Acad Sci U S A 108: 12681-12686

  • DOI: 10.1073/pnas.1104834108
  • Primary Citation of Related Structures:  
    3QSQ

  • PubMed Abstract: 
  • Astroviruses are single-stranded, plus-sense RNA viruses that infect both mammals and birds, causing gastroenteritis and other extraintestinal diseases. Clinical studies have established astroviruses as the second leading cause of viral diarrhea in young children ...

    Astroviruses are single-stranded, plus-sense RNA viruses that infect both mammals and birds, causing gastroenteritis and other extraintestinal diseases. Clinical studies have established astroviruses as the second leading cause of viral diarrhea in young children. Here we report the crystal structure of the human astrovirus dimeric surface spike determined to 1.8-Å resolution. The overall structure of each spike/projection domain has a unique three-layered β-sandwiches fold, with a core, six-stranded β-barrel structure that is also found in the hepatitis E virus capsid protrusions, suggesting a closer phylogenetic relationship between these two viruses than previously acknowledged. Based on a hepatitis E virus capsid model, we performed homology modeling and produced a complete, T = 3 astrovirus capsid model with features remarkably similar to those observed in a cryoelectron microscopy reconstruction image of a human astrovirus. Mapping conserved residues onto the astrovirus projection domain revealed a putative receptor binding site with amino acid compositions characteristic for polysaccharide recognition. Our results will have an important impact on future characterization of astrovirus structure and function, and will likely have practical applications in the development of vaccines and antivirals.


    Organizational Affiliation

    Department of Biochemistry and Cell Biology, Rice University, 6100 Main Street, MS140, Houston, TX 77005, USA.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Capsid polyprotein A241Human astrovirus 8Mutation(s): 0 
Gene Names: ORF2
Find proteins for Q9IFX1 (Human astrovirus-8)
Explore Q9IFX1 
Go to UniProtKB:  Q9IFX1
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.80 Å
  • R-Value Free: 0.215 
  • R-Value Work: 0.180 
  • R-Value Observed: 0.181 
  • Space Group: P 32 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 48.374α = 90
b = 48.374β = 90
c = 167.098γ = 120
Software Package:
Software NamePurpose
HKL-2000data collection
PHASERphasing
REFMACrefinement
DENZOdata reduction
HKL-2000data scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2011-07-20
    Type: Initial release
  • Version 1.1: 2011-08-17
    Changes: Database references