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Uptake of a cell permeable G7-18NATE contruct into cells and binding with the Grb-7-SH2 domain

Nigus D Ambaye1, Reece C C Lim, Daniel J Clayton

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

Biopolymers
|June 22, 2010
PubMed

Insights

A new peptide inhibitor, G7-18NATE-P-Biotin, effectively targets the Grb7 protein in breast cancer cells. This inhibitor shows potential for reducing cancer cell migration and proliferation.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Oncology

Background:

  • Grb7 is an adapter protein overexpressed in breast and other cancers, interacting with ErbB2 and focal adhesion kinase.
  • This interaction contributes to cancer cell migration and proliferation.
  • Previous inhibitors targeting Grb7-binding partners have shown potential in impacting these processes.

Purpose of the Study:

  • To synthesize and characterize a novel biotinylated peptide inhibitor, G7-18NATE-P-Biotin, targeting Grb7.
  • To evaluate the cellular uptake, localization, and binding affinity of this new construct.
  • To assess its suitability for further investigation into anti-cancer therapeutic potential.

Main Methods:

  • Synthesis of biotinylated G7-18NATE-P-Biotin.
  • Cellular uptake and colocalization studies in MDA-MB-468 breast cancer cells.
  • Isothermal titration calorimetry to determine binding affinity to the Grb7-SH2 domain.

Main Results:

  • G7-18NATE-P-Biotin was efficiently taken up by MDA-MB-468 cells and localized with Grb7 in the cytoplasm.
  • The construct demonstrated micromolar binding affinity (K(d) = 14.4 microM) to the Grb7-SH2 domain.
  • This affinity is comparable to the previously studied G7-18NATE inhibitor.

Conclusions:

  • The shorter G7-18NATE-P-Biotin construct is effectively internalized by breast cancer cells.
  • It binds to the Grb7-SH2 domain with significant affinity.
  • This optimized inhibitor is suitable for further research on its antiproliferative and antimigratory effects in cancer.

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