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Structural basis of binding by cyclic nonphosphorylated peptide antagonists of Grb7 implicated in breast cancer

Nigus D Ambaye1, Stephanie C Pero, Menachem J Gunzburg

  • 1Department of Biochemistry and Molecular Biology, Monash University, Wellington Road, VIC 3800, Australia.

Journal of Molecular Biology
|August 2, 2011
PubMed

Insights

A novel peptide inhibitor, G7-18NATE, effectively blocks Growth-receptor-bound protein 7 (Grb7) in cancer cells. This study reveals its structural interaction and identifies improved analogues for potential Grb7-targeted cancer therapies.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Structural Biology

Background:

  • Growth-receptor-bound protein 7 (Grb7) is overexpressed in various cancers, correlating with erbB-2 receptor presence.
  • Grb7 promotes cancer progression by enhancing cell migration and proliferation.
  • Inhibiting Grb7 activity presents a therapeutic strategy for cancer treatment.

Purpose of the Study:

  • To elucidate the structural basis of G7-18NATE peptide inhibition of the Grb7 SH2 domain.
  • To identify and characterize novel Grb7 inhibitors with improved binding affinity.
  • To facilitate the development of second-generation Grb7-targeted therapeutics.

Main Methods:

  • X-ray crystallography to determine the Grb7-SH2 domain-G7-18NATE complex structure.
  • Phage display for identifying Grb7-SH2 binding peptide analogues.
  • Isothermal titration calorimetry to assess binding affinities of identified peptides.

Main Results:

  • The crystal structure reveals the specific interaction between G7-18NATE and the Grb7-SH2 domain.
  • Phage display identified G7-18NATE analogues with retained key amino acids (F2, G4, F9, YDN motif) and micromolar affinity.
  • Isothermal titration calorimetry confirmed similar or improved binding affinities for the novel analogues compared to G7-18NATE.

Conclusions:

  • The G7-18NATE peptide provides a structural foundation for Grb7 inhibition.
  • Optimized peptide analogues demonstrate enhanced binding to Grb7-SH2.
  • This research paves the way for developing effective Grb7-based cancer therapies.

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