Identification and characterization of antifungal compounds using a Saccharomyces cerevisiae reporter bioassay.

PloS One
Brad TebbetsBruce S Klein

Abstract

New antifungal drugs are urgently needed due to the currently limited selection, the emergence of drug resistance, and the toxicity of several commonly used drugs. To identify drug leads, we screened small molecules using a Saccharomyces cerevisiae reporter bioassay in which S. cerevisiae heterologously expresses Hik1, a group III hybrid histidine kinase (HHK) from Magnaporthe grisea. Group III HHKs are integral in fungal cell physiology, and highly conserved throughout this kingdom; they are absent in mammals, making them an attractive drug target. Our screen identified compounds 13 and 33, which showed robust activity against numerous fungal genera including Candida spp., Cryptococcus spp. and molds such as Aspergillus fumigatus and Rhizopus oryzae. Drug-resistant Candida albicans from patients were also highly susceptible to compounds 13 and 33. While the compounds do not act directly on HHKs, microarray analysis showed that compound 13 induced transcripts associated with oxidative stress, and compound 33, transcripts linked with heavy metal stress. Both compounds were highly active against C. albicans biofilm, in vitro and in vivo, and exerted synergy with fluconazole, which was inactive alone. Thus, we identified potent, b...Continue Reading

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Citations

Dec 24, 2013·Future Medicinal Chemistry·Nicolas DelattinKarin Thevissen
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Datasets Mentioned

BETA
GSE25822

Methods Mentioned

BETA
PCR

Software Mentioned

Genespring Gx
Cytoscape
Enrichment Map
MultiExperiment Viewer
Graphpad Prism
GSEA
GSEA Preranked tool
Preranked
Gene Set Enrichment Analysis ( GSEA )

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