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Updated: May 8, 2026

Affinity Precipitation of Active Rho-GEFs Using a GST-tagged Mutant Rho Protein (GST-RhoA(G17A)) from Epithelial Cell Lysates
Published on: March 31, 2012
RhoG activates Rac1 by direct interaction with the Dock180-binding protein Elmo
Hironori Katoh1, Manabu Negishi
1Laboratory of Molecular Neurobiology, Graduate School of Biostudies, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan. hirokato@pharm.kyoto-u.ac.jp
The small GTPase RhoG activates Rac1 through Elmo and Dock180, a pathway crucial for cell spreading and neurite outgrowth. This discovery clarifies how RhoG influences cell morphology and actin cytoskeleton regulation.
Area of Science:
- Cell Biology
- Molecular Biology
- Biochemistry
Background:
- The small GTPase Rac is key in regulating the actin cytoskeleton for cell migration and axon guidance.
- Elmo acts as an upstream regulator of Rac1, cooperating with Dock180.
- The precise mechanism by which RhoG regulates Rac1 activity remains unclear.
Purpose of the Study:
- To elucidate the downstream target and mechanism of RhoG in Rac1 activation.
- To investigate the formation of a ternary complex involving RhoG, Elmo, and Dock180.
- To determine the role of the RhoG-Elmo-Dock180 pathway in cellular processes.
Main Methods:
- Investigated the interaction between RhoG and Elmo using GTP-dependent assays.
- Analyzed the formation of a ternary complex with Dock180.
- Assessed the requirement of the RhoG-Elmo-Dock180 pathway in integrin-mediated cell spreading and nerve growth factor-induced neurite outgrowth.
Main Results:
- RhoG directly interacts with Elmo in a GTP-dependent manner.
- A ternary complex of RhoG, Elmo, and Dock180 was identified, leading to Rac1 activation.
- The RhoG-Elmo-Dock180 pathway is essential for Rac1 activation, cell spreading, and neurite outgrowth.
Conclusions:
- RhoG activates Rac1 via the Elmo-Dock180 complex.
- This pathway is critical for controlling cell morphology, including cell spreading and neurite outgrowth.
- The findings clarify a signaling cascade regulating the actin cytoskeleton.
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