Icosahedral asymmetric unit (iASU) model of the well-refined part of FHV eluted particle

Experimental Data Snapshot

  • Resolution: 4.70 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

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Structural Dynamics of Nonenveloped Virus Disassembly Intermediates.

Azad, K.Banerjee, M.

(2019) J Virol 93

  • DOI: https://doi.org/10.1128/JVI.01115-19
  • Primary Citation of Related Structures:  
    6ITB, 6ITF

  • PubMed Abstract: 

    The stability of icosahedral viruses is crucial for protecting the viral genome during transit; however, successful infection requires eventual disassembly of the capsid. A comprehensive understanding of how stable, uniform icosahedrons disassemble remains elusive, mainly due to the complexities involved in isolating transient intermediates. We utilized incremental heating to systematically characterize the disassembly pathway of a model nonenveloped virus and identified an intriguing link between virus maturation and disassembly. Further, we isolated and characterized two intermediates by cryo-electron microscopy and three-dimensional reconstruction, without imposing icosahedral symmetry. The first intermediate displayed a series of major, asymmetric alterations, whereas the second showed that the act of genome release, through the 2-fold axis, is actually confined to a small section on the capsid. Our study thus presents a comprehensive structural analysis of nonenveloped virus disassembly and emphasizes the asymmetric nature of programmed conformational changes. IMPORTANCE Disassembly or uncoating of an icosahedral capsid is a crucial step during infection by nonenveloped viruses. However, the dynamic and transient nature of the disassembly process makes it challenging to isolate intermediates in a temporal, stepwise manner for structural characterization. Using controlled, incremental heating, we isolated two disassembly intermediates: "eluted particles" and "puffed particles" of an insect nodavirus, Flock House virus (FHV). Cryo-electron microscopy and three-dimensional reconstruction of the FHV disassembly intermediates indicated that disassembly-related conformational alterations are minimally global and largely local, leading to asymmetry in the particle and eventual genome release without complete disintegration of the icosahedron.

  • Organizational Affiliation

    Kusuma School of Biological Sciences, Indian Institute of Technology Delhi, New Delhi, India.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
A, B, C
363Flock House virusMutation(s): 0 
Gene Names: alpha
Find proteins for P12870 (Flock house virus)
Explore P12870 
Go to UniProtKB:  P12870
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP12870
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 4.70 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 
EM Software:
TaskSoftware PackageVersion

Structure Validation

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Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
Department of Science & Technology (India)IndiaEMR/2015/000644

Revision History  (Full details and data files)

  • Version 1.0: 2019-08-28
    Type: Initial release
  • Version 1.1: 2019-11-06
    Changes: Data collection, Other
  • Version 1.2: 2020-03-11
    Changes: Database references