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Nonradioactive Assay to Measure Polynucleotide Phosphorylation of Small Nucleotide Substrates
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Determining Phosphodiesterase Activity (Radioactive Assay).

Barbara I Kazmierczak1,2

  • 1Department of Medicine, Yale University, 333 Cedar St., New Haven, CT, 06520-8022, USA. barbara.kazmierczak@yale.edu.

Methods in Molecular Biology (Clifton, N.J.)
|September 11, 2017
PubMed
Summary

This study details a sensitive radioactive assay for bacterial cyclic-di-GMP phosphodiesterases (PDEs). The method allows for rapid separation of substrate and product using thin-layer chromatography for accurate activity measurement.

Keywords:
Cyclic-di-GMPPhosphodiesteraseThin-layer chromatography

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Area of Science:

  • Biochemistry
  • Microbiology
  • Enzymology

Background:

  • Cyclic-di-GMP is a crucial bacterial second messenger regulating various cellular processes.
  • Cyclic-di-GMP phosphodiesterases (PDEs) are enzymes that hydrolyze cyclic-di-GMP, controlling its intracellular levels.
  • Understanding PDE activity is vital for deciphering bacterial physiology and developing antimicrobial strategies.

Purpose of the Study:

  • To describe a sensitive radioactive assay for measuring cyclic-di-GMP phosphodiesterase (PDE) activity.
  • To provide a method for rapid and easy separation of substrate and product.
  • To facilitate accurate quantification of PDE enzymatic function.

Main Methods:

  • Development of a radioactive assay utilizing a labeled cyclic-di-GMP substrate.
  • Application of thin-layer chromatography (TLC) for efficient separation of the substrate from its hydrolysis products.
  • Quantification of PDE activity based on the amount of hydrolyzed product detected.

Main Results:

  • The developed radioactive assay demonstrates high sensitivity for detecting PDE activity.
  • Thin-layer chromatography allows for quick and straightforward separation and analysis.
  • The protocol enables reliable measurement of enzyme kinetics and activity levels.

Conclusions:

  • This radioactive TLC-based assay is a robust and efficient tool for studying cyclic-di-GMP phosphodiesterases.
  • The method facilitates research into bacterial signaling pathways regulated by cyclic-di-GMP.
  • This protocol can be widely adopted for PDE characterization in various bacterial species.