Crystal structure of the human astrovirus MLB1 capsid protein spike domain at 1.86-A resolution

Experimental Data Snapshot

  • Resolution: 1.86 Å
  • R-Value Free: 0.260 
  • R-Value Work: 0.242 
  • R-Value Observed: 0.242 

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This is version 1.2 of the entry. See complete history


Structure of the divergent human astrovirus MLB capsid spike.

Delgado-Cunningham, K.Lopez, T.Khatib, F.Arias, C.F.DuBois, R.M.

(2022) Structure 30: 1573-1581.e3

  • DOI: https://doi.org/10.1016/j.str.2022.10.010
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Despite their worldwide prevalence and association with human disease, the molecular bases of human astrovirus (HAstV) infection and evolution remain poorly characterized. Here, we report the structure of the capsid protein spike of the divergent HAstV MLB clade (HAstV MLB). While the structure shares a similar folding topology with that of classical-clade HAstV spikes, it is otherwise strikingly different. We find no evidence of a conserved receptor-binding site between the MLB and classical HAstV spikes, suggesting that MLB and classical HAstVs utilize different receptors for host-cell attachment. We provide evidence for this hypothesis using a novel HAstV infection competition assay. Comparisons of the HAstV MLB spike structure with structures predicted from its sequence reveal poor matches, but template-based predictions were surprisingly accurate relative to machine-learning-based predictions. Our data provide a foundation for understanding the mechanisms of infection by diverse HAstVs and can support structure determination in similarly unstudied systems.

  • Organizational Affiliation

    Department of Biomolecular Engineering, University of California, Santa Cruz, Santa Cruz, CA 95064, USA. Electronic address: rmdubois@ucsc.edu.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Capsid polyprotein VP90
A, B, C
266Astrovirus MLB1Mutation(s): 0 
Find proteins for B6UYJ1 (Astrovirus MLB1)
Explore B6UYJ1 
Go to UniProtKB:  B6UYJ1
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupB6UYJ1
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

Unit Cell:
Length ( Å )Angle ( ˚ )
a = 72.1α = 90
b = 77.109β = 110.71
c = 75.445γ = 90
Software Package:
Software NamePurpose
BOSdata collection
XDSdata reduction
Aimlessdata scaling
Cootmodel building

Structure Validation

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Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)United StatesR01AI144090

Revision History  (Full details and data files)

  • Version 1.0: 2022-11-09
    Type: Initial release
  • Version 1.1: 2022-12-07
    Changes: Database references
  • Version 1.2: 2022-12-14
    Changes: Database references