Abstract
In yeast, the STB5 gene encodes a transcriptional factor belonging to binuclear cluster class (Zn2Cys6) of transcriptional regulators specific to ascomycetes. In this study, we prepared the Kluyveromyces lactis stb5Δ strain and assessed its responses to different stresses. We showed that KlSTB5 gene is able to complement the deficiencies of Saccharomyces cerevisiae stb5Δ mutant. The results of phenotypic analysis suggested that KlSTB5 gene deletion did not sensitize K. lactis cells to oxidative stress inducing compounds but led to Klstb5Δ resistance to 4-nitroquinoline-N-oxide and hygromycin B. Expression analysis indicated that the loss of KlSTB5 gene function induced the transcription of drug efflux pump encoding genes that might contribute to increased 4-nitroquinoline-N-oxide and hygromycin B tolerance. Our results show that KlStb5p functions as negative regulator of some ABC transporter genes in K. lactis.
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Bencova, A., Konecna, A., Toth Hervay, N. et al. Stb5p is involved in Kluyveromyces lactis response to 4-nitroquinoline-N-oxide stress. Folia Microbiol 64, 579–586 (2019). https://doi.org/10.1007/s12223-019-00682-7
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DOI: https://doi.org/10.1007/s12223-019-00682-7