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Related Experiment Video

Updated: May 10, 2026

Spatio-Temporal Manipulation of Small GTPase Activity at Subcellular Level and on Timescale of Seconds in Living Cells

Spatio-Temporal Manipulation of Small GTPase Activity at Subcellular Level and on Timescale of Seconds in Living Cells

Published on: March 9, 2012

Timing is everything: Rac1 controls Net1A localization to regulate cell adhesion.

Heather S Carr¹, Jeffrey A Frost

¹Department of Integrative Biology and Pharmacology; University of Texas Health Science Center at Houston; Houston, TX USA.

Cell Adhesion & Migration

|June 25, 2013

Summary

Rac1 activation drives Net1A to the plasma membrane, initiating RhoA signaling for cell adhesion. This process involves Net1A’s degradation, controlling myosin phosphorylation and focal adhesion maturation.

Keywords:

Net1A Rac1 RhoA breast cancer cell adhesion focal adhesion

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Comparing the Affinity of GTPase-binding Proteins using Competition Assays

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Published on: October 8, 2015

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Last Updated: May 10, 2026

Spatio-Temporal Manipulation of Small GTPase Activity at Subcellular Level and on Timescale of Seconds in Living Cells

Spatio-Temporal Manipulation of Small GTPase Activity at Subcellular Level and on Timescale of Seconds in Living Cells

Published on: March 9, 2012

Comparing the Affinity of GTPase-binding Proteins using Competition Assays

Comparing the Affinity of GTPase-binding Proteins using Competition Assays

Published on: October 8, 2015

Area of Science:

Cell Biology
Molecular Biology
Biochemistry

Background:

Cell adhesion triggers actin cytoskeleton reorganization, with Rac1 and RhoA regulating sequential phases.
Late-stage RhoA activation mechanisms remain unclear, despite Net1A's role in cancer cell motility.
Net1A, a guanine nucleotide exchange factor, activates RhoA/RhoB but is inhibited by nuclear sequestration.

Purpose of the Study:

To investigate the mechanisms controlling Net1A's plasma membrane localization.
To elucidate the role of Rac1 in regulating Net1A localization and activation.
To understand Net1A's function in cell adhesion dynamics.

Main Methods:

Studied Net1A relocalization and activation in response to Rac1.
Investigated the role of Net1A's catalytic activity and specific domains in localization.
Analyzed Net1A degradation pathways and its impact on downstream effectors.

Main Results:

Rac1 activation promotes Net1A plasma membrane relocalization and activation, independent of its catalytic activity or specific domains.
Net1A's relocalization is transient, followed by proteasomal degradation.
Plasma membrane-localized Net1A is crucial for myosin light chain phosphorylation, focal adhesion maturation, and cell spreading.

Conclusions:

Rac1-mediated Net1A relocalization from the nucleus to the plasma membrane is a novel regulatory mechanism.
Net1A plays a significant role in controlling actomyosin contractility and focal adhesion dynamics during cell adhesion.