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Kinetic determination of cellular LacZ expression
1Unit on Lymphocyte Function, Laboratory of Molecular Biology, NIMH, Bethesda, Maryland 20892.
Genetic Analysis, Techniques and Applications
|January 1, 1994
Summary
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.
- 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.