Antifungal Nafuredin and Epithiodiketopiperazine Derivatives From the Mangrove-Derived Fungus Trichoderma harzianum D13

Frontiers in Microbiology
Dong-Lin ZhaoCheng-Sheng Zhang

Abstract

A new polyketide derivative, nafuredin C (1), a novel heterocyclic dipeptide, trichodermamide G (3), together with four known biogenetically related compounds nafuredin A (2), trichodermamide A (4), aspergillazin A (5), and peniisocoumarin H (6), were isolated from the mangrove-derived fungus Trichoderma harzianum D13. Their structures, including their absolute configurations, were determined by spectroscopic analysis and time-dependent density functional theory-electronic circular dichroism (ECD) calculations. Trichodermamide G was found to be a novel epithiodiketopiperazine derivative with an unprecedented cyclic system containing a sulfur bridge, and nafuredin C represented the third nafuredin derivative of these homologous compounds. The new compound nafuredin C exhibited obvious antifungal activity against Magnaporthe oryzae with a minimum inhibitory concentration (MIC) of 8.63 μM, which is on the same order of magnitude as the positive control carbendazim (MIC = 3.27 μM).

References

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Citations

Aug 10, 2021·Frontiers in Microbiology·Jian-Long ZhangXing-Xiao Zhang
Oct 9, 2021·Natural Product Reports·Senhua ChenZhigang She

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Datasets Mentioned

BETA
MG827165

Methods Mentioned

BETA
nuclear magnetic resonance
NMR

Software Mentioned

Spartan
SpecDis
GraphPad Prism

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