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High-Throughput Assay for RhoGEFs Based on the Transcreener® GDP Assay.

Robert G Lowery1, Meera Kumar2

  • 1BellBrook Labs, Madison, WI, USA. bob.lowery@bellbrooklabs.com.

Methods in Molecular Biology (Clifton, N.J.)
|August 1, 2018
PubMed
Summary
This summary is machine-generated.

We developed a high-throughput screening method to measure GTPase exchange factor (GEF) activity by detecting GDP formation. This assay accelerates GDP release, a key step in the Rho GTPase cycle, enabling efficient screening.

Keywords:
Fluorescence polarizationGEF assayGEF inhibitorHigh-throughputHomogeneousMultiwell

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Cell Signaling

Background:

  • GTPase exchange factors (GEFs) regulate Rho GTPases, crucial for cell signaling.
  • Understanding GEF activity is vital for studying cellular processes and diseases.
  • Existing methods for GEF activity detection can be low-throughput.

Purpose of the Study:

  • To develop a high-throughput screening (HTS)-compatible assay for measuring GEF activity.
  • To utilize the rate-limiting GDP dissociation step in the Rho GTPase cycle for assay development.
  • To quantify GEF-stimulated GDP formation.

Main Methods:

  • A homogeneous assay format was employed.
  • The Transcreener® GDP GTPase Assay, a fluorescence polarization immunoassay (FPIA), was utilized.
  • The assay detects increased GDP formation, indicative of GEF activity.

Main Results:

  • The developed method is compatible with high-throughput screening.
  • GEF activity is detected by measuring the accelerated rate of GDP formation.
  • The assay provides a sensitive and homogeneous format for GEF activity measurement.

Conclusions:

  • A novel HTS-compatible method for GEF activity detection was established.
  • This assay leverages the Rho GTPase catalytic cycle for robust measurement.
  • The method facilitates efficient screening of GEF modulators.