1F23

CONTRIBUTION OF A BURIED HYDROGEN BOND TO HIV-1 ENVELOPE GLYCOPROTEIN STRUCTURE AND FUNCTION


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.3 Å
  • R-Value Free: 0.270 
  • R-Value Work: 0.191 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

Structural and functional analysis of the HIV gp41 core containing an Ile573 to Thr substitution: implications for membrane fusion.

Liu, J.Shu, W.Fagan, M.B.Nunberg, J.H.Lu, M.

(2001) Biochemistry 40: 2797-2807


  • PubMed Abstract: 
  • The envelope glycoprotein of HIV-1 consists of the surface subunit gp120 and the transmembrane subunit gp41. Binding of gp120 to target cell receptors induces a conformational change in gp41, which then mediates the fusion of viral and cellular membr ...

    The envelope glycoprotein of HIV-1 consists of the surface subunit gp120 and the transmembrane subunit gp41. Binding of gp120 to target cell receptors induces a conformational change in gp41, which then mediates the fusion of viral and cellular membranes. A buried isoleucine (Ile573) in a central trimeric coiled coil within the fusion-active gp41 ectodomain core is thought to favor this conformational activation. The role of Ile573 in determining the structure and function of the gp120-gp41 complex was investigated by mutating this residue to threonine, a nonconservative substitution in HIV-1 that occurs naturally in SIV. While the introduction of Thr573 markedly destabilized the gp41 core, the three-dimensional structure of the mutant trimer of hairpins was very similar to that of the wild-type molecule. A new hydrogen-bonding interaction between the buried Thr573 and Thr569 residues appears to allow formation of the trimer-of-hairpins structure at physiological temperature. The mutant envelope glycoprotein expressed in 293T cells and incorporated within pseudotyped virions displayed only a moderate reduction in syncytium-inducing capacity and virus infectivity, respectively. Our results demonstrate that the proper folding of the gp41 core underlies the membrane fusion properties of the gp120-gp41 complex. An understanding of the gp41 activation process may suggest novel strategies for vaccine and antiviral drug development.


    Organizational Affiliation

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




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
TRANSMEMBRANE GLYCOPROTEIN
A, B, C, D, E, F
76Human immunodeficiency virus 1Gene Names: env
Find proteins for Q89797 (Human immunodeficiency virus 1)
Go to UniProtKB:  Q89797
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.3 Å
  • R-Value Free: 0.270 
  • R-Value Work: 0.191 
  • Space Group: P 1
Unit Cell:
Length (Å)Angle (°)
a = 38.920α = 90.59
b = 41.870β = 88.93
c = 55.980γ = 96.28
Software Package:
Software NamePurpose
AMoREphasing
DENZOdata reduction
CNSrefinement
SCALEPACKdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2001-06-20
    Type: Initial release
  • Version 1.1: 2008-04-27
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance
  • Version 1.3: 2017-08-16
    Type: Refinement description, Source and taxonomy