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Screen for agents that induce autolysis in Bacillus subtilis.

Christopher J Lacriola¹, Shaun P Falk, Bernard Weisblum

¹Department of Medicine, University of Wisconsin School of Medicine and Public Health, Madison, Wisconsin, USA. weisblum@wisc.edu

Antimicrobial Agents and Chemotherapy

|October 24, 2012

Summary

New antibiotic discovery is crucial for combating resistant infections. This study developed a novel screening method using Bacillus subtilis strains to identify autolysis-inducing agents that target bacterial cell membranes, offering a promising avenue for new drug development.

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Area of Science:

Microbiology
Drug Discovery
Biochemistry

Background:

Antibiotic resistance is a growing global health threat, necessitating the discovery of novel antimicrobial agents.
Existing antibiotics often face resistance, driving the need for new therapeutic strategies.
Autolysis-inducing agents represent a potential class of antibiotics that trigger bacterial self-destruction.

Purpose of the Study:

To develop and validate a screening protocol for identifying autolysis-inducing agents.
To differentiate between agents that directly permeabilize the cell membrane and those that inhibit cell wall synthesis.
To discover novel compounds with antibacterial activity against resistant pathogens.

Main Methods:

Utilized two Bacillus subtilis reporter strains, SH-536 and BAU-102, for a novel screening assay.

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Employed a sequential screening approach: BAU-102 for initial identification and SH-536 for mechanism-of-action determination.

SH-536 differentiates agents by measuring β-galactosidase (β-Gal) release in late stationary phase.

Main Results:

Identified four potent autolysis-inducing compounds (compounds 2, 3, 5, and 24) from a chemical library.
Confirmed these compounds act by directly permeabilizing the Bacillus subtilis cell membrane.
Demonstrated broad-spectrum antibacterial activity against Staphylococcus aureus, Enterococcus faecium, Bacillus subtilis, and Bacillus anthracis.

Conclusions:

The developed screening protocol effectively identifies autolysis-inducing agents with specific mechanisms of action.
The four identified compounds show significant potential as novel antibiotics targeting bacterial membranes.
Further characterization of these compounds could lead to new treatments for antibiotic-resistant infections.