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Related Experiment Videos

Kinetic determination of cellular LacZ expression

J Marsh1

  • 1Unit on Lymphocyte Function, Laboratory of Molecular Biology, NIMH, Bethesda, Maryland 20892.

Genetic Analysis, Techniques and Applications
|January 1, 1994
PubMed
Summary
This summary is machine-generated.

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A new kinetic assay quantifies beta-galactosidase expression in LacZ transfected cells. This 96-well plate method offers automated, sensitive reporter gene detection without background interference.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Cell Biology

Background:

  • Beta-galactosidase (LacZ) is a widely used reporter gene in molecular biology.
  • Accurate quantification of LacZ expression is crucial for studying gene regulation and cellular processes.
  • Existing assays can be time-consuming or prone to background noise.

Purpose of the Study:

  • To develop a rapid, sensitive, and automatable kinetic assay for beta-galactosidase expression.
  • To establish a 96-well plate format assay for high-throughput screening.
  • To minimize background interference and non-enzymatic reactions.

Main Methods:

  • Cells transfected with the LacZ gene were solubilized.
  • Hydrolytic rates of o-nitrophenyl beta-D-galactoside were measured kinetically.

Related Experiment Videos

  • Assay performed in a 96-well plate format with sequential reagent addition at ambient temperatures.

    • Main Results:

    • The assay demonstrated linearity over a 6-log enzyme concentration range (0.001–100 mU).
    • Kinetic data acquisition effectively eliminated non-enzymatic background optical density.
    • The protocol allows for semiautomated or fully automated determination of reporter gene expression.

    Conclusions:

    • A robust and efficient kinetic assay for beta-galactosidase expression has been established.
    • The 96-well plate format and kinetic approach facilitate high-throughput analysis.
    • This method provides a sensitive and reliable tool for quantifying LacZ reporter gene activity.