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  • Title: The RTA3 Gene, Encoding a Putative Lipid Translocase, Influences the Susceptibility of Candida albicans to Fluconazole.
    Author: Whaley SG, Tsao S, Weber S, Zhang Q, Barker KS, Raymond M, Rogers PD.
    Journal: Antimicrob Agents Chemother; 2016 Oct; 60(10):6060-6. PubMed ID: 27480868.
    Abstract:
    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.
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