Cyclic colisporifungin and linear cavinafungins, antifungal lipopeptides isolated from Colispora cavincola.
JOURNAL OF NATURAL PRODUCTS 2015;
78:468-475. [PMID:
25636062 DOI:
10.1021/np500854j]
[Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Colisporifungin (1), a cyclic depsilipopeptide structurally related to the aselacins, and cavinafungins A and B, two linear peptides, were isolated from liquid culture broths of the hitherto unstudied fungus Colispora cavincola using a Candida albicans whole-cell assay as well as a bioassay to detect compounds potentiating the antifungal activity of caspofungin. The structural elucidation, including the absolute configuration of the new molecules, was accomplished using a combination of spectroscopic and chemical techniques, including 1D and 2D NMR, HRMS, and Marfey's analysis. The cyclic peptide colisporifungin displayed a strong potentiation of the growth inhibitory effect of caspofungin against Aspergillus fumigatus and, to a lesser extent, against Candida albicans. The linear peptides displayed broad-spectrum antifungal activities inhibiting growth of Candida species (MIC values 0.5-4 μg/mL) as well as A. fumigatus with a prominent inhibition of 8 μg/mL.
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