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Targeting Grb2 SH3 Domains with Affimer Proteins Provides Novel Insights into Ras Signalling Modulation.

Anna A S Tang1, Andrew Macdonald1,2, Michael J McPherson1,2

  • 1School of Molecular and Cellular Biology, Faculty of Biological Sciences, University of Leeds, Leeds LS2 9JT, UK.

Biomolecules
|August 29, 2024
PubMed
Summary
This summary is machine-generated.

New Affimer reagents target growth-factor-receptor-bound protein 2 (Grb2) SH3 domains. Inhibiting the C-terminal SH3 domain alone curtails Ras signaling, suggesting allosteric regulation of Grb2-SOS1 interactions.

Keywords:
cellular signallingprotein domainsprotein–protein interactions

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Area of Science:

  • Molecular Biology
  • Cell Signaling
  • Protein Interactions

Background:

  • Src homology 3 (SH3) domains mediate crucial protein-protein interactions (PPIs) in cellular processes.
  • Many SH3 domain functions remain uncharacterized due to a lack of specific research tools.
  • Growth-factor-receptor-bound protein 2 (Grb2) is a key adapter protein linking cell surface receptors to Ras signaling.

Purpose of the Study:

  • To develop Affimer proteins as specific reagents targeting the N- and C-terminal SH3 domains (NSH3 and CSH3) of Grb2.
  • To investigate the role of Grb2 SH3 domains in Ras pathway activation.
  • To explore the potential of targeting Grb2 for modulating cell signaling.

Main Methods:

  • Isolation of Affimer proteins against Grb2 NSH3 and CSH3 domains.
  • Utilizing Affimer reagents to inhibit Grb2 SH3 domain interactions.
  • Assessing Ras signaling pathway activation in mammalian cells stimulated with epidermal growth factor (EGF).

Main Results:

  • Affimer proteins were successfully generated against both Grb2 NSH3 and CSH3 domains.
  • Inhibition of the CSH3 domain alone was sufficient to curtail Ras signaling.
  • This finding challenges the prevailing model where NSH3 domain interactions are considered predominant for Ras activation.

Conclusions:

  • Targeting the Grb2 CSH3 domain can effectively inhibit Ras signaling.
  • The results support an allosteric model for the regulation of Grb2-SOS1 interactions and Ras pathway activation.
  • Affimer technology provides valuable tools for studying SH3 domain functions and PPIs.