Related Experiment Videos
Evidence for a direct interaction between insulin receptor substrate-1 and Shc
A Kasus-Jacobi1, D Perdereau, S Tartare-Deckert
1Centre de Recherche sur l'Endocrinologie Moléculaire et le Développement du CNRS, UPR 1511, 92190 Meudon, France.
The Journal of Biological Chemistry
|July 4, 1997
Summary
Insulin receptor substrate-1 (IRS-1) and Shc proteins directly interact, with their association enhanced by tyrosine phosphorylation. This phosphotyrosine-dependent binding is crucial for intracellular signal transduction pathways.
Area of Science:
- Molecular Biology
- Cell Signaling
- Biochemistry
Background:
- Insulin receptor substrate-1 (IRS-1) and Shc are key proteins in intracellular signal transduction.
- They are activated by various extracellular signals via receptor tyrosine kinases, cytokine receptors, and G protein-coupled receptors.
Purpose of the Study:
- To investigate the direct interaction between IRS-1 and Shc.
- To identify the domains and specific residues involved in this interaction.
- To determine the role of tyrosine phosphorylation in mediating the IRS-1-Shc association.
Main Methods:
- Yeast two-hybrid system to detect protein-protein interactions.
- In vitro interaction and association assays.
- Deletion analysis and site-directed mutagenesis to map interaction domains and residues.
Main Results:
- Shc directly interacts with IRS-1.
- The phosphotyrosine binding domain of Shc binds to IRS-1 amino acids 583-661.
- Tyrosine phosphorylation significantly enhances the IRS-1-Shc interaction.
- Specific residues within the IRS-1 N625GDY628 motif and Tyr608 are critical for this interaction.
Conclusions:
- IRS-1 and Shc form a direct, phosphotyrosine-dependent complex.
- This interaction plays a significant role in cellular signal transduction pathways.
- Understanding this molecular mechanism provides insights into receptor tyrosine kinase signaling.