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A series of lipopeptide compounds co-produced during the fermentation of pneumocandin A0 (L-671,329) and related semisynthetic compounds were evaluated in vivo against Pneumocystis carinii pneumonia and systemic candidiasis. In addition, they were tested in vitro against a panel of pathogenic Candida species and in a Candida membrane 1,3-beta-D-glucan synthesis assay. The results of these studies demonstrate that pneumocandin A0 and pneumocandin B0 (L-688,786) are the most potent compounds when considering both antipneumocystis and anticandida activity. Other compounds in the series are selectively more potent against P. carinii or Candida albicans suggesting a diverging structure-activity relationship. Evaluation of these compounds for their ability to inhibit C. albicans 1,3-beta-D-glucan synthesis in vitro demonstrates that they inhibit this process. A positive correlation between 1,3-beta-D-glucan synthesis inhibition and in vitro antifungal activity was also demonstrated for some of the pneumocandins.

journal of antibiotics

Pneumocandins from Zalerion arboricola. IV. Biological evaluation of natural and semisynthetic pneumocandins for activity against Pneumocystis carinii and Candida species.