Abstract
Three new lipopeptaibols, halovirs I–K (1–3), were isolated from the solid culture of the phytopathogenic fungus Paramyrothecium roridum NRRL 2183. Their planar structures, which consist of a hexapeptide backbone and acyl substitutions at the N- and C-termini, were elucidated by comprehensive analysis of the 1D and 2D NMR spectroscopic data along with the detailed interpretation of the MS/MS fragmentation pattern. Absolute configurations of the amino acid/1,2-amino alcohol residues were determined using the advanced Marfey’s method. Bioinformatics analysis of the genome assembly of P. roridum NRRL 2183 revealed a gene cluster that is likely responsible for the biosynthesis of halovirs I–K. Analysis of the module and domain organization of the putative halovir synthetase PrHalA indicated that the assembly of 1–3 proceeds in an unconventional nonlinear fashion. 1 and 2 exhibited potent antibacterial activity against both antibiotic-sensitive and multidrug-resistant Gram-positive pathogens. These lipopeptaibols also displayed significant cytotoxicity toward human lung carcinoma A549, human breast carcinoma MCF-7, and human cervical carcinoma HeLa cells with IC50 values ranging from 1.3 to 3.3 μM.
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (32170070 to CW, and 32070053 and 31870076 to YX); the Central Public-interest Scientific Institution Basal Research Fund (No. 1610392021004 to CW); the Agricultural Science and Technology Innovation Program of the Chinese Academy of Agricultural Sciences (CAAS-ASTIP to YX). The authors acknowledge Dr Lida Han (Research Facility Center of Biotechnology Research Institute) for the HRESIMS measurements.
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Xiao, D., Zhang, M., Wu, P. et al. Halovirs I–K, antibacterial and cytotoxic lipopeptaibols from the plant pathogenic fungus Paramyrothecium roridum NRRL 2183. J Antibiot 75, 247–257 (2022). https://doi.org/10.1038/s41429-022-00517-7
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DOI: https://doi.org/10.1038/s41429-022-00517-7