6CE5

NMR structure of the Rous sarcoma virus matrix protein (M-domain) in the presence of myo-inositol hexakisphosphate


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 80 
  • Conformers Submitted: 20 
  • Selection Criteria: structures with the lowest energy 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Structural basis for targeting avian sarcoma virus Gag polyprotein to the plasma membrane for virus assembly.

Vlach, J.Eastep, G.N.Ghanam, R.H.Watanabe, S.M.Carter, C.A.Saad, J.S.

(2018) J. Biol. Chem. 293: 18828-18840

  • DOI: 10.1074/jbc.RA118.003944
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • For most retroviruses, including HIV-1, binding of the Gag polyprotein to the plasma membrane (PM) is mediated by interactions between Gag's N-terminal myristoylated matrix (MA) domain and phosphatidylinositol 4,5-bisphosphate (PI(4,5)P <sub>2 </sub> ...

    For most retroviruses, including HIV-1, binding of the Gag polyprotein to the plasma membrane (PM) is mediated by interactions between Gag's N-terminal myristoylated matrix (MA) domain and phosphatidylinositol 4,5-bisphosphate (PI(4,5)P 2 ) in the PM. The Gag protein of avian sarcoma virus (ASV) lacks the N -myristoylation signal but contains structural domains having functions similar to those of HIV-1 Gag. The molecular mechanism by which ASV Gag binds to the PM is incompletely understood. Here, we employed NMR techniques to elucidate the molecular determinants of the membrane-binding domain of ASV MA (MA 87 ) to lipids and liposomes. We report that MA 87 binds to the polar head of phosphoinositides such as PI(4,5)P 2 We found that MA 87 binding to inositol phosphates (IPs) is significantly enhanced by increasing the number of phosphate groups, indicating that the MA 87 -IP binding is governed by charge-charge interactions. Using a sensitive NMR-based liposome-binding assay, we show that binding of MA 87 to liposomes is enhanced by incorporation of PI(4,5)P 2 and phosphatidylserine. We also show that membrane binding is mediated by a basic surface formed by Lys-6, Lys-13, Lys-23, and Lys-24. Substitution of these residues to glutamate abolished binding of MA 87 to both IPs and liposomes. In an accompanying paper, we further report that mutation of these lysine residues diminishes Gag assembly on the PM and inhibits ASV particle release. These findings provide a molecular basis for ASV Gag binding to the inner leaflet of the PM and advance our understanding of the basic mechanisms of retroviral assembly.


    Organizational Affiliation

    From the Department of Microbiology, University of Alabama at Birmingham, Birmingham, Alabama 35294 and.,the Department of Molecular Genetics and Microbiology, Stony Brook University, Stony Brook, New York 11794.,From the Department of Microbiology, University of Alabama at Birmingham, Birmingham, Alabama 35294 and saad@uab.edu.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
virus matrix protein (M-domain)
A
87Rous sarcoma virus (strain Prague C)Mutation(s): 1 
Gene Names: gag-pol
Find proteins for P03354 (Rous sarcoma virus (strain Prague C))
Go to UniProtKB:  P03354
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 80 
  • Conformers Submitted: 20 
  • Selection Criteria: structures with the lowest energy 

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History & Funding Information

Deposition Data

  • Deposited Date: 2018-02-11 
  • Released Date: 2018-11-07 
  • Deposition Author(s): Vlach, J., Saad, J.S.

Funding OrganizationLocationGrant Number
National Institutes of Health/National Cancer Institute (NIH/NCI)United States--

Revision History 

  • Version 1.0: 2018-11-07
    Type: Initial release
  • Version 1.1: 2018-12-19
    Type: Data collection, Database references
  • Version 1.2: 2019-12-11
    Type: Author supporting evidence, Data collection