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Related Experiment Videos

Fluorogenic assay for beta-glucuronidase using microchip-based capillary electrophoresis.

D E Starkey1, A Han, J J Bao

  • 1Department of Chemistry, University of Cincinnati, OH 45221-0172, USA.

Journal of Chromatography. B, Biomedical Sciences and Applications
|October 9, 2001
PubMed
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Microchip capillary electrophoresis (CE) offers a novel approach for drug screening by analyzing enzyme activity. This method successfully determined enzyme kinetics and inhibition, demonstrating its potential for high-throughput screening applications.

Area of Science:

  • Biochemistry
  • Analytical Chemistry
  • Biotechnology

Background:

  • Enzyme assays are crucial for drug discovery and development.
  • Conventional methods can be time-consuming and require significant sample volumes.
  • Microchip capillary electrophoresis (CE) presents a miniaturized and efficient alternative for biochemical analyses.

Purpose of the Study:

  • To evaluate the utility of microchip CE for combinatorial drug screening using a model enzyme assay.
  • To determine kinetic parameters and inhibitor effects of beta-glucuronidase.
  • To compare microchip CE performance with conventional CE methods.

Main Methods:

  • Utilized microchip CE to separate fluorescein mono-beta-D-glucuronide (FMG) and its hydrolysis product, fluorescein.

Related Experiment Videos

  • Monitored fluorescein production to assess beta-glucuronidase activity.
  • Performed Michaelis-Menten enzyme kinetics and inhibitor assays (IC50 determination) using microchip CE.

    • Main Results:

    • Successfully separated FMG and fluorescein using microchip CE.
    • Determined the Michaelis constant (Km) for beta-glucuronidase with FMG to be 18 microM, a novel finding.
    • Quantified the inhibitory effect of D-saccharic acid-1,4-lactone (SL) with an IC50 value of 3 microM.

    Conclusions:

    • Microchip CE is a viable and sensitive platform for enzyme kinetic studies and drug screening.
    • The method provides accurate and reproducible results comparable to conventional CE.
    • This technology holds promise for high-throughput screening in drug discovery.