Solution structure of V7R mutant of HIV-1 myristoylated matrix protein

Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 50 
  • Conformers Submitted: 20 
  • Selection Criteria: target function 

wwPDB Validation   3D Report Full Report

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Point mutations in the HIV-1 matrix protein turn off the myristyl switch.

Saad, J.S.Loeliger, E.Luncsford, P.Liriano, M.Tai, J.Kim, A.Miller, J.Joshi, A.Freed, E.O.Summers, M.F.

(2007) J Mol Biol 366: 574-585

  • DOI: https://doi.org/10.1016/j.jmb.2006.11.068
  • Primary Citation of Related Structures:  
    2JMG, 2NV3

  • PubMed Abstract: 

    During the late phase of human immunodeficiency virus type-1 (HIV-1) replication, newly synthesized retroviral Gag proteins are targeted to lipid raft regions of specific cellular membranes, where they assemble and bud to form new virus particles. Gag binds preferentially to the plasma membrane (PM) of most hematopoietic cell types, a process mediated by interactions between the cellular PM marker phosphatidylinositol-(4,5)-bisphosphate (PI(4,5)P(2)) and Gag's N-terminally myristoylated matrix (MA) domain. We recently demonstrated that PI(4,5)P(2) binds to a conserved cleft on MA and promotes myristate exposure, suggesting a role as both a direct membrane anchor and myristyl switch trigger. Here we show that PI(4,5)P(2) is also capable of binding to MA proteins containing point mutations that inhibit membrane binding in vitro, and in vivo, including V7R, L8A and L8I. However, these mutants do not exhibit PI(4,5)P(2) or concentration-dependent myristate exposure. NMR studies of V7R and L8A MA reveal minor structural changes that appear to be responsible for stabilizing the myristate-sequestered (myr(s)) species and inhibiting exposure. Unexpectedly, the myristyl group of a revertant mutant with normal PM targeting properties (V7R,L21K) is also tightly sequestered and insensitive to PI(4,5)P(2) binding. This mutant binds PI(4,5)P(2) with twofold higher affinity compared with the native protein, suggesting a potential compensatory mechanism for membrane binding.

  • Organizational Affiliation

    Howard Hughes Medical Institute and Department of Chemistry and Biochemistry, University of Maryland Baltimore County, 1000 Hilltop Circle, Baltimore, MD 21250, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Gag polyprotein131Human immunodeficiency virus 1Mutation(s): 1 
Gene Names: gag
Find proteins for Q6E183 (Human immunodeficiency virus 1)
Explore Q6E183 
Go to UniProtKB:  Q6E183
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ6E183
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on MYR

Download Ideal Coordinates CCD File 
C14 H28 O2
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 50 
  • Conformers Submitted: 20 
  • Selection Criteria: target function 

Structure Validation

View Full Validation Report

Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2007-02-06
    Type: Initial release
  • Version 1.1: 2008-05-01
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2021-08-18
    Changes: Data collection, Database references, Derived calculations, Experimental preparation
  • Version 1.4: 2021-10-20
    Changes: Database references
  • Version 1.5: 2023-12-20
    Changes: Data collection, Other