New Bacterial Toxins Show Promise in Fighting Infections

A recent study published in Nature Microbiology unveiled a new class of bacterial toxins with potent antibacterial and antifungal properties. Researchers from Hebrew University, in collaboration with scientists from the Weizmann Institute of Science and the University of Hohenheim, identified these toxins by analyzing over 105,000 microbial genomes using an innovative computational approach.

The team successfully validated nine newly discovered toxins, each representing a large evolutionary conserved family. These toxins demonstrated the ability to cause cell death in both Escherichia coli and Saccharomyces cerevisiae when expressed in these model organisms. Additionally, five antitoxin genes, also known as immunity genes, were identified, which protect the toxin-producing bacteria from self-destruction.

One of the most significant findings was the toxins' powerful antifungal activity against various pathogenic fungi, while leaving certain invertebrate species and macrophages unaffected. Lead researcher Asaf Levy stated, "Our findings expand our understanding of how bacteria use toxins in competition with other microbes and provide exciting avenues for future research into critically needed antimicrobial agents against human and plant bacterial and fungal pathogens. The potential for these toxins to serve as a foundation for new clinical treatments or biotechnological innovations is particularly exciting.”

The study suggests that these toxins primarily act as efficient enzymes targeting essential cellular processes, such as the cell membrane, DNA, or cell division. Structural analysis of two toxin-immunity protein complexes confirmed that some of these toxins possess DNase activity, which can degrade DNA in target cells.

As the world grapples with the rise of antibiotic-resistant pathogens, these newly identified toxins offer potential new avenues for treating infections and combating antimicrobial resistance.