3F4Z

Trimeric helix bundle formed by an alpha/beta-peptide derivative of the HIV gp41 CHR domain


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.10 Å
  • R-Value Free: 0.249 
  • R-Value Work: 0.204 
  • R-Value Observed: 0.206 

Starting Model: experimental
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wwPDB Validation   3D Report Full Report


This is version 2.0 of the entry. See complete history


Literature

Structural and biological mimicry of protein surface recognition by alpha/beta-peptide foldamers

Horne, W.S.Johnson, L.M.Ketas, T.J.Klasse, P.J.Lu, M.Moore, J.P.Gellman, S.H.

(2009) Proc Natl Acad Sci U S A 106: 14751-14756

  • DOI: https://doi.org/10.1073/pnas.0902663106
  • Primary Citation of Related Structures:  
    3F4Y, 3F4Z, 3F50, 3G7A

  • PubMed Abstract: 

    Unnatural oligomers that can mimic protein surfaces offer a potentially useful strategy for blocking biomedically important protein-protein interactions. Here we evaluate an approach based on combining alpha- and beta-amino acid residues in the context of a polypeptide sequence from the HIV protein gp41, which represents an excellent testbed because of the wealth of available structural and biological information. We show that alpha/beta-peptides can mimic structural and functional properties of a critical gp41 subunit. Physical studies in solution, crystallographic data, and results from cell-fusion and virus-infectivity assays collectively indicate that the gp41-mimetic alpha/beta-peptides effectively block HIV-cell fusion via a mechanism comparable to that of gp41-derived alpha-peptides. An optimized alpha/beta-peptide is far less susceptible to proteolytic degradation than is an analogous alpha-peptide. Our findings show how a two-stage design approach, in which sequence-based alpha-->beta replacements are followed by site-specific backbone rigidification, can lead to physical and biological mimicry of a natural biorecognition process.


  • Organizational Affiliation

    Department of Chemistry, University of Wisconsin, 1101 University Avenue, Madison, WI 53706, USA.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
alpha/beta-peptide analogue of the HIV gp41 CHR domain
A, B, C
40N/AMutation(s): 0 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
Sequence Annotations
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  • Reference Sequence
Small Molecules
Modified Residues  1 Unique
IDChains TypeFormula2D DiagramParent
B3E
Query on B3E
A, B, C
L-PEPTIDE LINKINGC6 H11 N O4GLU
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.10 Å
  • R-Value Free: 0.249 
  • R-Value Work: 0.204 
  • R-Value Observed: 0.206 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 71.335α = 90
b = 43.989β = 105.4
c = 58.142γ = 90
Software Package:
Software NamePurpose
MD2data collection
PHASERphasing
REFMACrefinement
HKL-2000data reduction
HKL-2000data scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2009-09-15
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Version format compliance
  • Version 1.2: 2023-09-06
    Changes: Advisory, Data collection, Database references, Derived calculations, Refinement description
  • Version 2.0: 2023-11-15
    Changes: Atomic model, Data collection, Derived calculations