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Related Experiment Videos

A fluorescence-based assay for human type II phospholipase A2

S G Blanchard1, C O Harris, D J Parks

  • 1Department of Biochemistry, Glaxo Research Institute, Research Triangle Park, North Carolina 27709.

Analytical Biochemistry
|November 1, 1994
PubMed
Summary

A new fluorescence assay accurately quantifies human Type II Phospholipase A2 (hPLA2-II) activity. This sensitive method enables efficient enzyme activity measurement without product separation, ideal for kinetic studies and high-throughput screening.

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Area of Science:

  • Biochemistry
  • Enzymology

Background:

  • Human Type II Phospholipase A2 (hPLA2-II) plays a role in inflammatory diseases.
  • Accurate and efficient quantification of hPLA2-II activity is crucial for research and drug discovery.
  • Existing assays, such as radiochemical methods, have limitations in terms of continuous monitoring and product separation.

Purpose of the Study:

  • To develop and validate a novel, continuous fluorescence-based assay for quantifying human Type II Phospholipase A2 activity.
  • To compare the performance of the new assay with existing methods.
  • To assess the suitability of the assay for kinetic analysis and high-throughput screening.

Main Methods:

  • A specific fluorogenic substrate, 1-Acyl-2-(N-4-nitrobenzo-2-oxo-1,3-diazole)aminododecanoyl Phosphatidylethanolamine, was synthesized and prepared as a sonicated dispersion.

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  • Enzyme activity was measured by monitoring the increase in fluorescence intensity upon substrate hydrolysis.
  • Kinetic parameters, including Km, were determined by fitting initial rate data to the Michaelis-Menten equation.

    • Main Results:

    • The fluorescence intensity increase was directly proportional to hPLA2-II enzyme activity.
    • The assay demonstrated high sensitivity and a Michaelis constant (Km) of 13 µM.
    • The assay allowed for continuous measurement of enzyme activity without the need for substrate-product separation.
    • Hydrolysis of a corresponding phosphatidylcholine substrate was significantly slower, indicating substrate specificity.

    Conclusions:

    • The developed fluorescence assay provides a sensitive, continuous, and efficient method for quantifying human Type II Phospholipase A2 activity.
    • This assay is suitable for both detailed kinetic studies and large-scale screening applications, including automated plate readers.
    • Advantages include high sensitivity and the use of a commercially available substrate, making it a valuable tool in biochemical and pharmacological research.