2FX8

Crystal structure of hiv-1 neutralizing human fab 4e10 in complex with an aib-induced peptide encompassing the 4e10 epitope on gp41


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.20 Å
  • R-Value Free: 0.283 
  • R-Value Work: 0.235 

Starting Model: experimental
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This is version 1.6 of the entry. See complete history


Literature

Structural basis of enhanced binding of extended and helically constrained peptide epitopes of the broadly neutralizing HIV-1 antibody 4E10.

Cardoso, R.M.Brunel, F.M.Ferguson, S.Zwick, M.Burton, D.R.Dawson, P.E.Wilson, I.A.

(2007) J Mol Biol 365: 1533-1544

  • DOI: https://doi.org/10.1016/j.jmb.2006.10.088
  • Primary Citation of Related Structures:  
    2FX7, 2FX8, 2FX9

  • PubMed Abstract: 

    Potent, broadly HIV-1 neutralizing antibodies (nAbs) may be invaluable for the design of an AIDS vaccine. 4E10 is the broadest HIV-1 nAb known to date and recognizes a contiguous and highly conserved helical epitope in the membrane-proximal region of gp41. The 4E10 epitope is thus an excellent target for vaccine design as it is also highly amenable to peptide engineering to enhance its helical character. To investigate the structural effect of both increasing the peptide length and of introducing helix-promoting constraints in the 4E10 epitope, we have determined crystal structures of Fab 4E10 bound to an optimized peptide epitope (NWFDITNWLWYIKKKK-NH(2)), an Aib-constrained peptide epitope (NWFDITNAibLWRR-NH(2)), and a thioether-linked peptide (NWFCITOWLWKKKK-NH(2)) to resolutions of 1.7 A, 2.1 A, and 2.2 A, respectively. The thioether-linked peptide is the first reported structure of a cyclic tethered helical peptide bound to an antibody. The introduced helix constraints limit the conformational flexibility of the peptides without affecting interactions with 4E10. The substantial increase in affinity (10 nM versus 10(4) nM of the IC(50) of the original KGND peptide template) is largely realized by 4E10 interaction with an additional helical turn at the peptide C terminus that includes Leu679 and Trp680. Thus, the core 4E10 epitope was extended and modified to a WFX(I/L)(T/S)XX(L/I)W motif, where X does not play a major role in 4E10 binding and can be used to introduce helical-promoting constraints in the peptide epitope.


  • Organizational Affiliation

    Department of Molecular Biology, The Scripps Research Institute, La Jolla, CA 92037, USA.


Macromolecules
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Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Fab 4E10A [auth L],
C [auth M],
E [auth N],
G [auth O]
214Homo sapiensMutation(s): 0 
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  • Reference Sequence
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Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
Fab 4E10B [auth H],
D [auth I],
F [auth J],
H [auth K]
227Homo sapiensMutation(s): 0 
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  • Reference Sequence

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Entity ID: 3
MoleculeChains Sequence LengthOrganismDetailsImage
Fragment of HIV glycoprotein (GP41)I [auth P],
J [auth Q],
K [auth R],
L [auth S]
12N/AMutation(s): 2 
UniProt
Find proteins for P05880 (Human immunodeficiency virus type 1 group M subtype B (isolate WMJ22))
Explore P05880 
Go to UniProtKB:  P05880
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UniProt GroupP05880
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  • Reference Sequence
Small Molecules
Modified Residues  1 Unique
IDChains TypeFormula2D DiagramParent
AIB
Query on AIB
I [auth P],
J [auth Q],
K [auth R],
L [auth S]
L-PEPTIDE LINKINGC4 H9 N O2ALA
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.20 Å
  • R-Value Free: 0.283 
  • R-Value Work: 0.235 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 53.454α = 90
b = 113.253β = 94.15
c = 149.961γ = 90
Software Package:
Software NamePurpose
HKL-2000data collection
SCALEPACKdata scaling
AMoREphasing
CNSrefinement
HKL-2000data reduction

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2006-12-19
    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: 2014-01-22
    Changes: Atomic model
  • Version 1.4: 2021-10-20
    Changes: Database references, Derived calculations
  • Version 1.5: 2023-08-30
    Changes: Data collection, Refinement description
  • Version 1.6: 2023-11-15
    Changes: Data collection