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The EGF receptor is an actin-binding protein.
J C den Hartigh1, P M van Bergen en Henegouwen, A J Verkleij
1Department of Molecular Cell Biology, University of Utrecht, The Netherlands.
The Journal of Cell Biology
|October 1, 1992
Summary
The Epidermal Growth Factor Receptor (EGFR) directly binds to actin filaments. This interaction is mediated by a specific domain within EGFR, identified as amino acid residues 984-996.
Area of Science:
- Cell Biology
- Molecular Biology
- Biochemistry
Background:
- Recent studies suggest a link between the Epidermal Growth Factor Receptor (EGFR) and the actin cytoskeleton in vivo.
- Understanding this interaction is crucial for comprehending EGFR's cellular functions and signaling pathways.
Purpose of the Study:
- To demonstrate a direct physical association between purified EGFR and filamentous actin (F-actin).
- To identify the specific domain within EGFR responsible for actin binding.
- To characterize the nature of the EGFR-actin interaction.
Main Methods:
- Cosedimentation assays using purified EGFR and F-actin.
- Utilizing a truncated EGFR mutant as a negative control.
- Competition assays with a polyclonal antibody and synthetic peptides (HL-33, HL-34) to map the actin-binding domain.
Main Results:
- Purified EGFR cosedimented with F-actin, confirming a direct interaction.
- A truncated EGFR mutant did not cosediment with F-actin.
- The synthetic peptide HL-33 (residues 984-996), homologous to profilin's actin-binding domain, competed for EGFR-actin binding and bound directly to actin.
- The peptide HL-34 did not affect EGFR-actin binding, indicating a single actin-binding site on EGFR within residues 984-996.
Conclusions:
- EGFR is an actin-binding protein.
- The EGFR interacts with actin filaments via a specific domain encompassing amino acid residues 984-996.
- This finding provides molecular insight into EGFR's association with the actin cytoskeleton.