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SH2- and SH3-mediated interactions between focal adhesion kinase and Src
J W Thomas1, B Ellis, R J Boerner
1Department of Cell Biology and Anatomy, University of North Carolina, Chapel Hill, North Carolina 27599, USA.
The Journal of Biological Chemistry
|February 7, 1998
Summary
Specific interactions between Src kinases and FAK are crucial for cell signaling. Disrupting these interactions, particularly the SH3-mediated binding, impacts Src kinase activity and downstream phosphorylation events.
Area of Science:
- Molecular Biology
- Cell Signaling
- Protein Interactions
Background:
- Src kinases are regulated by intramolecular SH2 and SH3 domain interactions.
- Activation of Src kinases can occur through disruption of these interactions by higher affinity ligand binding.
Purpose of the Study:
- To investigate the role of the Src SH3-binding site in FAK as a ligand for Src.
- To determine how FAK's SH2 and SH3 binding sites influence Src kinase activity and signaling.
Main Methods:
- Surface plasmon resonance (SPR) to measure binding affinity.
- In vitro kinase assays to assess Src activation.
- In vivo studies using a FAK mutant (FAKPro-2) to analyze binding and phosphorylation.
Main Results:
- A FAK peptide with both SH2 and SH3 binding sites showed increased affinity for Src.
- The presence of both sites enhanced c-Src activation in vitro.
- FAKPro-2 mutant exhibited reduced binding to Src and decreased Src-dependent phosphorylation.
Conclusions:
- An SH3-mediated interaction between Src-like kinases and FAK is important for complex formation.
- This interaction plays a role in regulating downstream signaling pathways in vivo.
- FAK acts as a ligand for Src, influencing kinase activity and substrate phosphorylation.