3CYO

Structure of a longer thermalstable core domain of HIV-1 GP41 containing the enfuvirtide resistance mutation N43D and complementary mutation E137K


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.1 Å
  • R-Value Free: 0.332 
  • R-Value Work: 0.242 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Impact of the enfuvirtide resistance mutation N43D and the associated baseline polymorphism E137K on peptide sensitivity and six-helix bundle structure.

Bai, X.Wilson, K.L.Seedorff, J.E.Ahrens, D.Green, J.Davison, D.K.Jin, L.Stanfield-Oakley, S.A.Mosier, S.M.Melby, T.E.Cammack, N.Wang, Z.Greenberg, M.L.Dwyer, J.J.

(2008) Biochemistry 47: 6662-6670

  • DOI: 10.1021/bi702509d
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Enfuvirtide (ENF), the first human immunodeficiency virus type 1 (HIV-1) fusion inhibitor approved for clinical use, acts by binding to gp41 heptad repeat 1 (HR1) and preventing its interaction with the viral HR2 region. Treatment-emergent resistance ...

    Enfuvirtide (ENF), the first human immunodeficiency virus type 1 (HIV-1) fusion inhibitor approved for clinical use, acts by binding to gp41 heptad repeat 1 (HR1) and preventing its interaction with the viral HR2 region. Treatment-emergent resistance to ENF has been mapped to residues within HR1, and these mutations decrease its susceptibility to ENF and may reduce viral fitness and pathogenesis, although the mechanism for these effects is not clear. N43D, a common ENF resistance mutation, was found in in vitro assays to cause a 5-50-fold in antiviral activity. We introduced this mutation into peptide models and determined the impact of this mutation by circular dichroism and X-ray crystallography. We find that the mutation results in a decrease in the thermal stability of the six-helix bundle and causes a significant change in the HR1-HR2 interface, including a loss of HR2 helicity. These data form a mechanistic basis for the decrease in ENF sensitivity and six-helix bundle stability. The E137K polymorphism, generally present at baseline in patients who develop N43D, partially compensates for the loss of stability, and we show that these residues likely form an ion pair. These data form a framework for understanding the impact of resistance mutations on viral fitness and pathogenesis and provide a pathway for the development of novel fusion inhibitor peptides.


    Organizational Affiliation

    Protein Engineering Group and Virology Group, Trimeris, Inc., 3500 Paramount Parkway, Morrisville, North Carolina 27560, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Transmembrane protein
A
86Human immunodeficiency virus 1Mutation(s): 2 
Gene Names: gp41
Find proteins for Q53I19 (Human immunodeficiency virus 1)
Go to UniProtKB:  Q53I19
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.1 Å
  • R-Value Free: 0.332 
  • R-Value Work: 0.242 
  • Space Group: P 21 3
Unit Cell:
Length (Å)Angle (°)
a = 59.290α = 90.00
b = 59.290β = 90.00
c = 59.290γ = 90.00
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling
CNSrefinement
CNSphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2008-06-17
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Version format compliance
  • Version 1.2: 2017-08-16
    Type: Refinement description, Source and taxonomy