5D0J

Grb7 SH2 with inhibitor peptide


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.60 Å
  • R-Value Free: 0.246 
  • R-Value Work: 0.187 
  • R-Value Observed: 0.190 

Starting Model: experimental
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This is version 1.1 of the entry. See complete history


Literature

Unexpected involvement of staple leads to redesign of selective bicyclic peptide inhibitor of Grb7.

Gunzburg, M.J.Kulkarni, K.Watson, G.M.Ambaye, N.D.Del Borgo, M.P.Brandt, R.Pero, S.C.Perlmutter, P.Wilce, M.C.Wilce, J.A.

(2016) Sci Rep 6: 27060-27060

  • DOI: https://doi.org/10.1038/srep27060
  • Primary Citation of Related Structures:  
    5D0J, 5EEL, 5EEQ

  • PubMed Abstract: 

    The design of potent and specific peptide inhibitors to therapeutic targets is of enormous utility for both proof-of-concept studies and for the development of potential new therapeutics. Grb7 is a key signaling molecule in the progression of HER2 positive and triple negative breast cancers. Here we report the crystal structure of a stapled bicyclic peptide inhibitor G7-B1 in complex with the Grb7-SH2 domain. This revealed an unexpected binding mode of the peptide, in which the staple forms an alternative contact with the surface of the target protein. Based on this structural information, we designed a new series of bicyclic G7 peptides that progressively constrain the starting peptide, to arrive at the G7-B4 peptide that binds with an approximately 2-fold enhanced affinity to the Grb7-SH2 domain (KD = 0.83 μM) compared to G7-B1 and shows low affinity binding to Grb2-, Grb10- and Grb14-SH2 domains (KD > 100 μM). Furthermore, we determined the structure of the G7-B4 bicyclic peptide in complex with the Grb7-SH2 domain, both before and after ring closing metathesis to show that the closed staple is essential to the target interaction. The G7-B4 peptide represents an advance in the development of Grb7 inhibitors and is a classical example of structure aided inhibitor development.


  • Organizational Affiliation

    Biomedicine Discovery Institute, Department of Biochemistry and Molecular Biology, Monash University, Wellington Road, Clayton VIC 3800, Australia.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Growth factor receptor-bound protein 7
A, B, C, D
120Homo sapiensMutation(s): 0 
Gene Names: GRB7
UniProt & NIH Common Fund Data Resources
Find proteins for Q14451 (Homo sapiens)
Explore Q14451 
Go to UniProtKB:  Q14451
PHAROS:  Q14451
GTEx:  ENSG00000141738 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ14451
Sequence Annotations
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  • Reference Sequence

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Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
G7-TEdFP peptideE [auth L],
F [auth M]
9synthetic constructMutation(s): 0 
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.60 Å
  • R-Value Free: 0.246 
  • R-Value Work: 0.187 
  • R-Value Observed: 0.190 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 33.98α = 90
b = 94.04β = 90
c = 131.49γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
PDB_EXTRACTdata extraction
xia2data reduction
xia2data scaling
MOLREPphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2016-06-15
    Type: Initial release
  • Version 1.1: 2023-09-27
    Changes: Data collection, Database references, Derived calculations, Refinement description