Abstract
Dalesconols (dalesconols A and B) were isolated from Daldinia eschscholzii and have remarkable immunosuppressive activity. In this study, the response of fungal growth, intra- and extracellular Ca2+, and dalesconols production after CaCl2 addition were reported for the first time. After supplementation with 5mM Ca2+ at 24h, dalesconols production reached 84.33mg/L, which resulted in a 1.57-fold enhancement compared to the control. The key role of calcium/calmodulin signaling in dalesconols biosynthesis was confirmed by treatment with Ca2+ channel and calmodulin inhibitors. The transcriptional levels of dalesconols biosynthetic genes were up-regulated after CaCl2 addition and down-regulated after inhibitors were added. The results demonstrated that Ca2+ addition induces dalesconols biosynthesis through up-regulation of dalesconols biosynthesis genes via regulation of calcium/calmodulin signaling. This study provided an efficient strategy for improving dalesconols production and would facilitate further research on the biosynthesis and regulation of dalesconols.
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