DNA Supercoiling Catalyzed by Bacterial Gyrase.

Area of Science:

• Bacteriology
• Molecular Biology
• Biochemistry

Background:

• DNA gyrase, a type II topoisomerase, is vital for bacterial DNA management.
• It resolves positive supercoils and introduces negative supercoils into DNA.
• Gyrase's unique ability to introduce negative supercoils is key for antibacterial drug targeting.

Purpose of the Study:

• To outline a protocol for a purified enzyme assay measuring DNA gyrase supercoiling activity.
• To establish a method for assessing the inhibitory effects of potential antibacterial compounds on DNA gyrase.

Main Methods:

• Utilizes purified DNA gyrase enzyme subunits and a relaxed DNA substrate.
• Employs gel electrophoresis to visualize and quantify DNA supercoiling.
• Focuses on the supercoiling activity of Escherichia coli wild-type gyrase.

Main Results:

• The protocol successfully monitors DNA gyrase's ability to introduce negative supercoils.
• The assay provides a quantitative measure of gyrase catalytic activity.
• Demonstrates the utility of the assay for evaluating antibacterial compound efficacy.

Conclusions:

• The described in vitro assay is effective for studying DNA gyrase supercoiling activity.
• This method serves as a reliable indicator for the potency of antibacterial agents targeting DNA gyrase.
• The protocol is adaptable for studying gyrase from various bacterial species.