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Quantitative study of protein association at picomolar concentrations: the lambda phage cl repressor
D Beckett1, K S Koblan, G K Ackers
1Department of Biology, Johns Hopkins University, Baltimore, Maryland 21218.
Analytical Biochemistry
|July 1, 1991
Summary
A new radiolabeling method allows precise measurement of lambda cl repressor protein. This technique enables accurate studies on DNA binding protein assembly energetics and stoichiometry.
Area of Science:
- Molecular Biology
- Biochemistry
- Biophysics
Background:
- Accurate quantitation of DNA binding proteins is crucial for understanding gene regulation.
- Studying the energetics and stoichiometry of protein-DNA interactions is often challenging.
Purpose of the Study:
- To develop a method for radiolabeling lambda cl repressor for high-sensitivity quantitation.
- To enable quantitative studies on the energetics of repressor assembly.
- To provide a versatile methodology for other tightly associating DNA binding proteins.
Main Methods:
- Radiolabeling of lambda cl repressor to achieve high specific activity.
- Quantitative analysis using large zone analytical gel chromatography.
- Application of the methodology to study protein-DNA interactions.
Main Results:
- Achieved specific activity sufficient for picomolar concentration quantitation of the repressor.
- Demonstrated accurate quantitative study of repressor assembly energetics.
- Validated the methodology's applicability to other DNA binding protein systems.
Conclusions:
- The developed radiolabeling method provides a sensitive tool for protein quantitation.
- This technique facilitates precise studies on the energetics and stoichiometry of protein-DNA interactions.
- The methodology is broadly applicable to challenging systems involving tightly associating DNA binding proteins.