The RTA3 Gene, Encoding a Putative Lipid Translocase, Influences the Susceptibility of Candida albicans to Fluconazole.

The RTA3 gene, coding for a member of the Rta1p-like lipid-translocating exporter family, is coordinately upregulated with the ATP-binding cassette transporter genes CDR1 and CDR2 in azole-resistant clinical isolates of Candida albicans that carry activating mutations in the transcription factor Tac1p. We show here that deleting RTA3 in an azole-resistant clinical isolate carrying a Tac1p-activating mutation lowered fluconazole resistance by 2-fold, while overexpressing RTA3 in an azole-susceptible clinical isolate resulted in enhanced fluconazole tolerance associated with trailing growth in a liquid microtiter plate assay. We also demonstrate that an Rta3p-green fluorescent protein (GFP) fusion protein localizes predominantly to the plasma membrane, consistent with a putative function for Rta3p as a lipid translocase. Copyright © 2016, American Society for Microbiology. All Rights Reserved.

Citation

Sarah G Whaley, Sarah Tsao, Sandra Weber, Qing Zhang, Katherine S Barker, Martine Raymond, P David Rogers. The RTA3 Gene, Encoding a Putative Lipid Translocase, Influences the Susceptibility of Candida albicans to Fluconazole. Antimicrobial agents and chemotherapy. 2016 Oct;60(10):6060-6

PMID: 27480868

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