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Isolation of two peptaibols with potent antimicrobial and cytotoxic activities from the mangrove endophytic fungus Trichoderma lentiforme ML-P8-2.
Natural Product Research 2024 March 28
Trichorzin PA is a family of 18-residue peptaibols with linear and flexible peptide chains. The three-dimensional structures and biological activities of trichorzin PA peptaibols are largely uncharacterised. In this work, two previously identified peptaibols, trichorzin PA VI ( 1 ) and II ( 2 ), were isolated from Trichoderma lentiforme ML-P8-2. While for the first time, we report here the X-ray crystallographic structure of 1 , antimicrobial activities against a panel of common pathogenic bacteria and fungi, and cytotoxicities of 1 and 2 . In bioassays, 1 and 2 exhibited strong antimicrobial activities against the seven tested microbes, with MIC values in the range of 0.19-6.25 μM. Additionally, 1 and 2 displayed potent cytotoxicities against five human cancer cell lines, with IC50 values in the range of 0.01 ± 0.02-2.75 ± 0.17 μM. The bioassay results were generally better than those reported for other 18-residue peptaibols, including other trichorzin PA members.
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