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Updated: Jun 18, 2026

Comparing the Affinity of GTPase-binding Proteins using Competition Assays
Published on: October 8, 2015
The Rho-family GEF Asef2 activates Rac to modulate adhesion and actin dynamics and thereby regulate cell migration
Jeanne M Bristow1, Meredith H Sellers, Devi Majumdar
1Department of Biological Sciences, Vanderbilt University, Nashville, Tennessee 37235, USA.
Asef2 regulates cell migration and adhesion dynamics by modulating actin. This study shows Asef2 is crucial for cell movement and rapid adhesion turnover, impacting Rho-family GTPase activity.
Area of Science:
- Cell Biology
- Molecular Biology
- Biochemistry
Background:
- Asef2, a Rho-family guanine nucleotide exchange factor (GEF), is implicated in actin modulation.
- Its precise role in cell migration and adhesion dynamics remains unclear.
Purpose of the Study:
- To elucidate the function of Asef2 in regulating cell migration and adhesion turnover.
- To identify the molecular pathways influenced by Asef2 in these processes.
Main Methods:
- Knockdown of endogenous Asef2 in HT1080 cells.
- Analysis of cell migration and adhesion dynamics.
- Assays for Rac1, Cdc42, and Rho activity.
- Investigation of the roles of PI3K and Akt signaling pathways.
Main Results:
- Asef2 knockdown impairs cell migration and slows adhesion turnover.
- Asef2 enhances Rac1 and Cdc42 activity, with Rac1 being critical for migration and turnover.
- Asef2 signaling requires Phosphoinositide 3-kinase (PI3K) and Akt, increasing active Akt at the leading edge.
- Asef2 signaling decreases overall Rho activity, promoting migration and adhesion dynamics.
Conclusions:
- Asef2 is a key regulator of cell migration and adhesion turnover.
- Asef2 promotes these processes by coordinating Rho-family GTPase activities, particularly Rac1, and involving PI3K/Akt signaling.
- This reveals a novel role for Asef2 in cell motility and dynamic adhesion remodeling.
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