4X6S

Grb7 SH2 domain with phosphotyrosine mimetic inhibitor peptide


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.55 Å
  • R-Value Free: 0.252 
  • R-Value Work: 0.202 
  • R-Value Observed: 0.205 

wwPDB Validation   3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

Cyclic Peptides Incorporating Phosphotyrosine Mimetics as Potent and Specific Inhibitors of the Grb7 Breast Cancer Target.

Watson, G.M.Gunzburg, M.J.Ambaye, N.D.Lucas, W.A.Traore, D.A.Kulkarni, K.Cergol, K.M.Payne, R.J.Panjikar, S.Pero, S.C.Perlmutter, P.Wilce, M.C.Wilce, J.A.

(2015) J Med Chem 58: 7707-7718

  • DOI: 10.1021/acs.jmedchem.5b00609
  • Primary Citation of Related Structures:  
    4X6S, 4WWQ

  • PubMed Abstract: 
  • The Grb7 adaptor protein is a therapeutic target for both TNBC and HER2+ breast cancer. A nonphosphorylated cyclic peptide 1 (known as G7-18NATE) inhibits Grb7 via targeting the Grb7-SH2 domain, but requires the presence of phosphate ions for both affinity and specificity ...

    The Grb7 adaptor protein is a therapeutic target for both TNBC and HER2+ breast cancer. A nonphosphorylated cyclic peptide 1 (known as G7-18NATE) inhibits Grb7 via targeting the Grb7-SH2 domain, but requires the presence of phosphate ions for both affinity and specificity. Here we report the discovery of malonate bound in the phosphotyrosine binding pocket of the apo-Grb7-SH2 structure. Based on this, we carried out the rational design and synthesis of two analogues of peptide 1 that incorporate carboxymethylphenylalanine (cmF) and carboxyphenylalanine (cF) as mimics of phosphotyrosine (pY). Binding studies using SPR confirmed that affinity for Grb7-SH2 domain is improved up to 9-fold over peptide 1 under physiological phosphate conditions (KD = 2.1-5.7 μM) and that binding is specific for Grb7-SH2 over closely related domains (low or no detectable binding to Grb2-SH2 and Grb10-SH2). X-ray crystallographic structural analysis of the analogue bearing a cmF moiety in complex with Grb7-SH2 has identified the precise contacts conferred by the pY mimic that underpin this improved molecular interaction. Together this study identifies and characterizes the tightest specific inhibitor of Grb7 to date, representing a significant development toward a new Grb7-targeted therapeutic.


    Organizational Affiliation

    Department of Surgery and Vermont Cancer Center, University of Vermont , Burlington, Vermont 05401, United States.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Growth factor receptor-bound protein 7A, B107Homo 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
Protein Feature View
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  • Reference Sequence
  • Find similar proteins by:  Sequence   |   Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Phosphotyrosine mimetic inhibitor peptide G7-TEM1C [auth L], D [auth M]11synthetic constructMutation(s): 0 
Protein Feature View
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  • Reference Sequence
Small Molecules
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
1PA
Query on 1PA
C [auth L], D [auth M]L-PEPTIDE LINKINGC11 H13 N O4PHE
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.55 Å
  • R-Value Free: 0.252 
  • R-Value Work: 0.202 
  • R-Value Observed: 0.205 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 55.48α = 90
b = 68.895β = 90
c = 77.038γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
PDB_EXTRACTdata extraction
xia2data reduction
xia2data scaling
PHASERphasing

Structure Validation

View Full Validation Report




Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2015-09-23
    Type: Initial release
  • Version 1.1: 2015-10-28
    Changes: Database references