Disruption of Membrane Integrity by the Bacterium-Derived Antifungal Jagaricin

Area of Science:

• Microbiology
• Mycology
• Biochemistry

Background:

• Jagaricin is a lipopeptide produced by *Janthinobacterium agaricidamnosum*, a bacterial pathogen causing mushroom soft rot.
• This lipopeptide exhibits potent antifungal activity against human-pathogenic fungi.

Purpose of the Study:

• To elucidate the mechanism of action of jagaricin.
• To assess the potential of jagaricin for agricultural and therapeutic applications.

Main Methods:

• Investigated jagaricin's effect on membrane integrity and ion flux (including Ca2+).
• Analyzed the role of the calcineurin pathway in fungal tolerance.
• Performed transcriptional profiling of pathogenic yeasts exposed to jagaricin.

Main Results:

• Jagaricin impairs membrane integrity, causing rapid ion influx into target cells.
• The calcineurin pathway is essential for tolerance in *Candida albicans*.
• Jagaricin induces cell wall strengthening, disrupts membrane potential-driven transport, and upregulates lipid transporters.
• Jagaricin exhibits low plant toxicity but has hemolytic effects.

Conclusions:

• Jagaricin's membrane-disrupting action is a promising antifungal mechanism.
• Potential applications exist in agriculture due to its efficacy against phytopathogenic fungi and low plant toxicity.
• Modifications are necessary for safe human therapeutic use due to observed hemolytic activity.