A high-throughput screening approach to anthrax lethal factor inhibition.

Area of Science:

• Biochemistry
• Microbiology
• Pharmacology

Background:

• Bacillus anthracis lethal factor (LF) is a metallo-protease crucial for anthrax pathogenesis.
• Developing inhibitors against bacterial toxins is essential for biodefense and public health.

Purpose of the Study:

• To identify novel inhibitors of Bacillus anthracis lethal factor (LF) using a high-throughput screening approach.
• To characterize the enzymatic activity and selectivity of identified inhibitors against metallo-proteases.

Main Methods:

• A library of ~14,000 compounds was screened using a fluorescence-based in vitro assay.
• Enzymatic characterization involved measuring IC50 and Ki values against a panel of metallo-proteases.
• Selectivity was assessed against human metallo-proteases MMP-2 and MMP-9.

Main Results:

• Identification of new chemical scaffolds that inhibit LF.
• Inhibitors demonstrated low micromolar activity against LF and Botulinum Neurotoxin Type A.
• The identified compounds selectively spared human metallo-proteases MMP-2 and MMP-9.

Conclusions:

• Novel scaffolds targeting LF and Botulinum Neurotoxin Type A were discovered.
• These scaffolds exhibit selectivity, sparing human metallo-proteases.
• The findings support further development of potent and selective anti-toxin agents.