A newly published study explores the intriguing possibility that heptelidic (koningic) acid — a well-known sesquiterpene lactone produced by Trichoderma virens — may act as a microbial hormone regulating the fungus’s secondary metabolism. Heptelidic acid has long been recognized for its antibacterial, anti-oomycete, and cytotoxic properties, but its potential regulatory role within the producing organism itself had not been examined in depth.
The authors used a Δhas1 mutant strain lacking the key terpene cyclase involved in heptelidic acid biosynthesis. Transcriptomic analysis revealed that numerous genes associated with major secondary metabolite clusters — including gliovirin (glv), viridin (vdn), and volatile sesquiterpene/heptelidic acid biosynthesis (vir) — were significantly downregulated in the mutant.
Metabolomic profiling supported this observation: viridin, viridiol, gliovirin, heptelidic acid, and even an additional sesquiterpene (dihydroartemisinin) were absent in the Δhas1 strain. Thousands of metabolites were differentially regulated, with many showing substantial reductions in abundance.
The study builds upon earlier findings showing that heptelidic acid production is influenced by both a specialized GAPDH isoform within the vir gene cluster (acting as a positive regulator) and the Tex7 non-ribosomal peptide synthetase (acting as a negative regulator). Combined, these observations imply a complex regulatory network in which heptelidic acid itself may be a central signal controlling secondary metabolism.
While further studies are needed — including receptor identification and chemical complementation — the evidence strongly supports the possibility that heptelidic acid functions as a microbial hormone in T. virens. This discovery could open new pathways for enhancing metabolite production in industrial and agricultural biotechnology.
Reference
Bansal, R., Sethy, S.K., Barvkar, V.T. et al. Is heptelidic (koningic) acid a microbial hormone that regulates secondary metabolism in the biocontrol fungus Trichoderma virens?. Curr Genet 71, 29 (2025). https://doi.org/10.1007/s00294-025-01334-9
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