6T64

A model of the EIAV CA-SP hexamer (C6) from Gag-deltaMA spheres assembled at pH6


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.7 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SUBTOMOGRAM AVERAGING 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Structures of immature EIAV Gag lattices reveal a conserved role for IP6 in lentivirus assembly.

Dick, R.A.Xu, C.Morado, D.R.Kravchuk, V.Ricana, C.L.Lyddon, T.D.Broad, A.M.Feathers, J.R.Johnson, M.C.Vogt, V.M.Perilla, J.R.Briggs, J.A.G.Schur, F.K.M.

(2020) Plos Pathog. 16: e1008277-e1008277

  • DOI: 10.1371/journal.ppat.1008277
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Retrovirus assembly is driven by the multidomain structural protein Gag. Interactions between the capsid domains (CA) of Gag result in Gag multimerization, leading to an immature virus particle that is formed by a protein lattice based on dimeric, tr ...

    Retrovirus assembly is driven by the multidomain structural protein Gag. Interactions between the capsid domains (CA) of Gag result in Gag multimerization, leading to an immature virus particle that is formed by a protein lattice based on dimeric, trimeric, and hexameric protein contacts. Among retroviruses the inter- and intra-hexamer contacts differ, especially in the N-terminal sub-domain of CA (CANTD). For HIV-1 the cellular molecule inositol hexakisphosphate (IP6) interacts with and stabilizes the immature hexamer, and is required for production of infectious virus particles. We have used in vitro assembly, cryo-electron tomography and subtomogram averaging, atomistic molecular dynamics simulations and mutational analyses to study the HIV-related lentivirus equine infectious anemia virus (EIAV). In particular, we sought to understand the structural conservation of the immature lentivirus lattice and the role of IP6 in EIAV assembly. Similar to HIV-1, IP6 strongly promoted in vitro assembly of EIAV Gag proteins into virus-like particles (VLPs), which took three morphologically highly distinct forms: narrow tubes, wide tubes, and spheres. Structural characterization of these VLPs to sub-4Å resolution unexpectedly showed that all three morphologies are based on an immature lattice with preserved key structural components, highlighting the structural versatility of CA to form immature assemblies. A direct comparison between EIAV and HIV revealed that both lentiviruses maintain similar immature interfaces, which are established by both conserved and non-conserved residues. In both EIAV and HIV-1, IP6 regulates immature assembly via conserved lysine residues within the CACTD and SP. Lastly, we demonstrate that IP6 stimulates in vitro assembly of immature particles of several other retroviruses in the lentivirus genus, suggesting a conserved role for IP6 in lentiviral assembly.


    Organizational Affiliation

    Department of Chemistry and Biochemistry, University of Delaware, Newark, Delaware, United States of America.,Structural Studies Division, Medical Research Council Laboratory of Molecular Biology, Cambridge, United Kingdom.,Department of Molecular Biology and Genetics, Cornell University, Ithaca, New York, United States of America.,Institute of Science and Technology Austria, Klosterneuburg, Austria.,Structural and Computational Biology Unit, European Molecular Biology Laboratory, Heidelberg, Germany.,Department of Molecular Microbiology and Immunology, University of Missouri, Columbia, Missouri, United States of America.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Gag polyprotein
A, B, C
486Equine infectious anemia virus (isolate 1369)Mutation(s): 0 
Gene Names: gag
Find proteins for P69730 (Equine infectious anemia virus (isolate 1369))
Go to UniProtKB:  P69730
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.7 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SUBTOMOGRAM AVERAGING 
Software Package:
Software NamePurpose
PHENIXrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Austrian Science FundAustriaP31445
National Institutes of Health/National Institute Of Allergy and Infectious DiseasesUnited StatesR01-AI147890
National Institutes of Health/National Institute of General Medical SciencesUnited StatesR01-GM107013
National Science Foundation (United States)United States1659534
National Institutes of Health/National Institute of General Medical SciencesUnited StatesP30-GM110758
National Institutes of Health/National Institute Of Allergy and Infectious DiseasesUnited StatesP50AI150481
National Institutes of Health/National Institute Of Allergy and Infectious DiseasesUnited StatesAI142263
European Research CouncilUnited KingdomERC-2014-CoG 648432 - MEMBRANEFUSION
Medical Research Council (United Kingdom)United KingdomMC_UP_1201/16
German Research FoundationGermanyBR 3635/2-1

Revision History 

  • Version 1.0: 2020-01-15
    Type: Initial release
  • Version 1.1: 2020-02-19
    Type: Database references