Validamycin A

Validamycin A (CAS No.: 37248-47-8) is a naturally derived agricultural antibiotic isolated from Streptomyces hygroscopicus var. limoneus that functions as a potent antifungal agent and biochemical tool in enzymology research. Its primary mechanism of action involves inhibition of trehalase, a key enzyme in trehalose metabolism, particularly in phytopathogenic fungi such as Rhizoctonia solani, thereby disrupting energy utilization and fungal development; inhibitory activity has been reported across nanomolar to micromolar ranges depending on assay conditions. Validamycin A also exhibits antifungal efficacy against species including Aspergillus flavus, with growth inhibition observed at low microgram-per-milliliter concentrations, and has broader activity against other agriculturally relevant fungi affecting plant health. In addition to its role in carbohydrate metabolism interference, the compound acts as a reversible inhibitor of tyrosinase, expanding its relevance to studies of enzyme regulation and pigment-related pathways. Owing to these properties, Validamycin A is widely used in vitro to investigate trehalose biosynthesis, fungal pathogenicity, and enzyme inhibition mechanisms, and serves as a reference molecule in antifungal screening and inhibitor development programs; experimental concentrations are typically selected based on specific model systems and research objectives.