4A1W

Crystal structure of alpha-beta foldamer 4c in complex with Bcl-xL


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.50 Å
  • R-Value Free: 0.264 
  • R-Value Work: 0.197 
  • R-Value Observed: 0.200 

wwPDB Validation   3D Report Full Report


This is version 2.1 of the entry. See complete history


Literature

Evaluation of Diverse Alpha/Beta-Backbone Patterns for Functional Alpha-Helix Mimicry: Analogues of the Bim Bh3 Domain.

Boersma, M.D.Haase, H.S.Peterson-Kaufman, K.J.Lee, E.F.Clarke, O.B.Colman, P.M.Smith, B.J.Horne, W.S.Fairlie, W.D.Gellman, S.H.

(2012) J Am Chem Soc 134: 315

  • DOI: 10.1021/ja207148m
  • Primary Citation of Related Structures:  
    4A1U, 4A1W

  • PubMed Abstract: 
  • Peptidic oligomers that contain both α- and β-amino acid residues, in regular patterns throughout the backbone, are emerging as structural mimics of α-helix-forming conventional peptides (composed exclusively of α-amino acid residues). Here we describe a comprehensive evaluation of diverse α/β-peptide homologues of the Bim BH3 domain in terms of their ability to bind to the BH3-recognition sites on two partner proteins, Bcl-x(L) and Mcl-1 ...

    Peptidic oligomers that contain both α- and β-amino acid residues, in regular patterns throughout the backbone, are emerging as structural mimics of α-helix-forming conventional peptides (composed exclusively of α-amino acid residues). Here we describe a comprehensive evaluation of diverse α/β-peptide homologues of the Bim BH3 domain in terms of their ability to bind to the BH3-recognition sites on two partner proteins, Bcl-x(L) and Mcl-1. These proteins are members of the anti-apoptotic Bcl-2 family, and both bind tightly to the Bim BH3 domain itself. All α/β-peptide homologues retain the side-chain sequence of the Bim BH3 domain, but each homologue contains periodic α-residue → β(3)-residue substitutions. Previous work has shown that the ααβαααβ pattern, which aligns the β(3)-residues in a 'stripe' along one side of the helix, can support functional α-helix mimicry, and the results reported here strengthen this conclusion. The present study provides the first evaluation of functional mimicry by ααβ and αααβ patterns, which cause the β(3)-residues to spiral around the helix periphery. We find that the αααβ pattern can support effective mimicry of the Bim BH3 domain, as manifested by the crystal structure of an α/β-peptide bound to Bcl-x(L), affinity for a variety of Bcl-2 family proteins, and induction of apoptotic signaling in mouse embryonic fibroblast extracts. The best αααβ homologue shows substantial protection from proteolytic degradation relative to the Bim BH3 α-peptide.


    Organizational Affiliation

    Department of Chemistry, University of Wisconsin-Madison, Madison, Wisconsin 53706, USA.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
BCL-2-LIKE PROTEIN 1ABCD158Homo sapiensMutation(s): 0 
Gene Names: BCL2L1BCL2LBCLX
Find proteins for Q07817 (Homo sapiens)
Explore Q07817 
Go to UniProtKB:  Q07817
NIH Common Fund Data Resources
PHAROS  Q07817
Protein Feature View
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  • Reference Sequence
  • Find similar proteins by:  Sequence   |   Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
ALPHA-BETA-FOLDAMER 2CPQRS19synthetic constructMutation(s): 0 
Find proteins for O43521 (Homo sapiens)
Explore O43521 
Go to UniProtKB:  O43521
NIH Common Fund Data Resources
PHAROS  O43521
Protein Feature View
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  • Reference Sequence
Small Molecules
Modified Residues  3 Unique
IDChainsTypeFormula2D DiagramParent
B3E
Query on B3E
P,Q,R,SL-PEPTIDE LINKINGC6 H11 N O4GLU
B3Y
Query on B3Y
P,Q,R,SL-PEPTIDE LINKINGC10 H13 N O3TYR
HT7
Query on HT7
P,Q,R,SL-PEPTIDE LINKINGC12 H14 N2 O2TRP
Biologically Interesting Molecules (External Reference) 1 Unique
Entity ID: 2
IDChainsNameType/Class2D Diagram3D Interactions
PRD_000999
Query on PRD_000999
P, Q, R, SALPHA-BETA-FOLDAMER 2CPeptide-like /  Inhibitor

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Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.50 Å
  • R-Value Free: 0.264 
  • R-Value Work: 0.197 
  • R-Value Observed: 0.200 
  • Space Group: P 21 21 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 80.213α = 90
b = 106.29β = 90
c = 100.44γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
XDSdata reduction
SCALEPACKdata scaling
PHASERphasing

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2011-12-28
    Type: Initial release
  • Version 1.1: 2012-01-25
    Changes: Other
  • Version 1.2: 2012-11-30
    Changes: Other
  • Version 1.3: 2018-06-20
    Changes: Advisory, Data collection, Derived calculations
  • Version 2.0: 2019-04-24
    Changes: Data collection, Polymer sequence
  • Version 2.1: 2019-07-10
    Changes: Data collection