1DLB

HELICAL INTERACTIONS IN THE HIV-1 GP41 CORE REVEALS STRUCTURAL BASIS FOR THE INHIBITORY ACTIVITY OF GP41 PEPTIDES


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2 Å
  • R-Value Free: 0.243 
  • R-Value Work: 0.206 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

Helical interactions in the HIV-1 gp41 core reveal structural basis for the inhibitory activity of gp41 peptides.

Shu, W.Liu, J.Ji, H.Radigen, L.Jiang, S.Lu, M.

(2000) Biochemistry 39: 1634-1642


  • PubMed Abstract: 
  • The HIV-1 gp41 envelope protein mediates membrane fusion that leads to virus entry into the cell. The core structure of fusion-active gp41 is a six-helix bundle in which an N-terminal three-stranded coiled coil is surrounded by a sheath of antiparall ...

    The HIV-1 gp41 envelope protein mediates membrane fusion that leads to virus entry into the cell. The core structure of fusion-active gp41 is a six-helix bundle in which an N-terminal three-stranded coiled coil is surrounded by a sheath of antiparallel C-terminal helices. A conserved glutamine (Gln 652) buried in this helical interface replaced by leucine increases HIV-1 infectivity. To define the basis for this enhanced membrane fusion activity, we investigate the role of the Gln 652 to Leu substitution on the conformation, stability, and biological activity of the N34(L6)C28 model of the gp41 ectodomain core. The 2.0 A resolution crystal structure of the mutant molecule shows that the Leu 652 side chains make prominent contacts with hydrophobic grooves on the surface of the central coiled coil. The Gln 652 to Leu mutation leads to a marginal stabilization of the six-helix bundle by -0.8 kcal/mol, evaluated from thermal unfolding experiments. Strikingly, the mutant N34(L6)C28 peptide is a potent inhibitor of HIV-1 infection, with 10-fold greater activity than the wild-type molecule. This inhibitory potency can be traced to the corresponding C-terminal mutant peptide that likely has greater potential to interact with the coiled-coil trimer. These results provide strong evidence that conserved interhelical packing interactions in the gp41 core are important determinants of HIV-1 entry and its inhibition. These interactions also offer a test-bed for the development of more potent analogues of gp41 peptide inhibitors.


    Organizational Affiliation

    Department of Biochemistry, Weill Medical College of Cornell University, 1300 York Avenue, New York, New York 10021, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
HIV-1 ENVELOPE GLYCOPROTEIN GP41
A
68Human immunodeficiency virus type 1 group M subtype BMutation(s): 1 
Gene Names: env
Find proteins for P04578 (Human immunodeficiency virus type 1 group M subtype B)
Go to UniProtKB:  P04578
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2 Å
  • R-Value Free: 0.243 
  • R-Value Work: 0.206 
  • Space Group: H 3
Unit Cell:
Length (Å)Angle (°)
a = 52.382α = 90.00
b = 52.382β = 90.00
c = 60.482γ = 120.00
Software Package:
Software NamePurpose
CNSrefinement
SCALEPACKdata scaling
DENZOdata reduction
AMoREphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1999-12-15
    Type: Initial release
  • Version 1.1: 2008-04-27
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Derived calculations, Version format compliance
  • Version 1.3: 2017-08-09
    Type: Refinement description, Source and taxonomy