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Related Concept Videos

GTPases and their Regulation02:14

GTPases and their Regulation

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Guanine nucleotide-binding proteins (G-proteins), also known as GTPases, are a superfamily of proteins that regulate many cellular processes, such as cell signaling, vesicular transport, and the regulation of cell shape and motility. Mutation or dysfunction of these proteins can lead to disease. There are around 40,000 known G-proteins that can broadly be classified into two groups ‒  small G-proteins consisting of a single domain and large multi-domain G-proteins.
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Ras and Rho are small monomeric GTPases that act downstream of receptor tyrosine kinase (RTK) and regulate various cellular processes. These GTPases switch between active and inactive states by binding to guanine nucleotides.
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Heterotrimeric G proteins are guanine nucleotide-binding proteins. As the name suggests, heterotrimeric G proteins are composed of three subunits: alpha, beta, and gamma. They remain GDP-bound or GTP-bound inside the cells and switch between inactive/active states. The Gα subunit possesses the nucleotide-binding pocket that binds guanine nucleotides and switches between GDP or GTP-bound states. In contrast, the Gꞵ and Gγ subunits are always bound together with high...
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Rab proteins constitute the largest family of monomeric GTPases, of which 70 members are present in humans. Rab proteins and their effectors regulate consecutive stages of vesicle transport such as vesicle transport, docking, and fusion to the correct recipient membrane.
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Related Experiment Video

Updated: Mar 31, 2026

Comparing the Affinity of GTPase-binding Proteins using Competition Assays
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Comparing the Affinity of GTPase-binding Proteins using Competition Assays

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Comparing the Affinity of GTPase-binding Proteins using Competition Assays.

Rosalind C Williamson1, Mark D Bass2

  • 1School of Biochemistry, University of Bristol.

Journal of Visualized Experiments : Jove
|October 21, 2015
PubMed
Summary

This study presents a novel assay for comparing GTPase-binding protein competition. The method accurately quantifies binding interactions by controlling nucleotide states and using GFP-tagged proteins for purification and detection.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Cell Signaling

Background:

  • GTPase interactions are competitive due to shared binding faces.
  • Controlling nucleotide states is crucial for studying GTPase biochemistry.
  • Conventional methods like immunoprecipitation are inadequate for this purpose.

Purpose of the Study:

  • To develop a robust method for comparing competition between GTPase-binding proteins.
  • To enable accurate assessment of GTPase binding capabilities under controlled conditions.

Main Methods:

  • Utilizes purified Rac1 immobilized on beads as bait.
  • Allows control over nucleotide loading (GDP, GTP-gamma-S, or nucleotide-free).
  • Employs GFP-tagged mammalian-purified binding proteins for co-purification and detection.

Main Results:

  • Enables accurate determination of relative amounts of two bound proteins.
  • Facilitates investigation of specific signaling stages by controlling nucleotide status.
  • Demonstrates a reliable approach for assessing competitive binding.

Conclusions:

  • The developed assay is effective for comparing GTPase-binding protein competition.
  • This method overcomes limitations of conventional techniques in GTPase biochemistry.
  • Provides a valuable tool for understanding GTPase-mediated signaling pathways.