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A High-content Imaging Workflow to Study Grb2 Signaling Complexes by Expression Cloning

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Published on: October 30, 2012

Dimerization in the Grb7 protein.

Tabitha A Peterson¹, Renee L Benallie, Andrew M Bradford

¹Department of Chemistry and Biochemistry, New Mexico State University, Las Cruces, NM 88003, USA.

Journal of Molecular Recognition : JMR

|July 20, 2012

Summary

Growth factor receptor-bound protein 7 (Grb7) dimerization is crucial for binding receptor tyrosine kinases (RTKs). Phosphorylation of Grb7

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Area of Science:

Molecular Biology
Cell Signaling
Protein Structure and Function

Background:

Previous studies demonstrated that the tyrosine phosphorylation of Grb7 impacts its interactions with FHL2 and human HS-1-associated protein-1.
Receptor tyrosine kinases (RTKs) dimerization is a known regulatory mechanism in signaling pathways.

Purpose of the Study:

To investigate the role of dimerization in the Grb7 Src homology 2 (SH2) domain.
To determine how Grb7 dimerization affects its binding to phosphorylated tyrosine peptide ligands, specifically from the RTK erbB2.

Main Methods:

Utilized circular dichroism and nuclear magnetic resonance to assess structural integrity and thermal stability of Grb7 SH2 domain mutants.
Created and analyzed tyrosine phosphorylation-mimic (Y80E) and dimerization-deficient (F99R) Grb7 SH2 domain mutants.
Measured binding thermodynamics of wild-type and mutant Grb7 SH2 domains to a phosphorylated erbB2 peptide.

Main Results:

Tyrosine phosphorylation-mimic and dimerization-deficient Grb7 SH2 mutants exhibited impaired dimerization.
Mutants bound the phosphorylated erbB2 peptide with altered thermodynamic characteristics compared to wild-type.
While structurally intact, both mutants showed reduced thermal stability.
Grb7 SH2 domain phosphorylation may regulate Grb7 dimerization.

Conclusions:

Grb7 dimerization is critical for its structural integrity and ligand binding affinity.
Phosphorylation of tyrosine residues within the Grb7 SH2 domain likely controls its dimerization.
Dimerization represents a potential regulatory mechanism for Grb7 binding to RTKs like erbB2, impacting downstream signaling.