Folia Microbiologica

, Volume 64, Issue 4, pp 579–586 | Cite as

Stb5p is involved in Kluyveromyces lactis response to 4-nitroquinoline-N-oxide stress

  • Alexandra BencovaEmail author
  • Alexandra Konecna
  • Nora Toth Hervay
  • Yvetta Gbelska
Original Article


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.


Transcriptional regulator Oxidative stress Drug resistance Kluyveromyces lactis 


Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

Supplementary material

12223_2019_682_MOESM1_ESM.docx (14 kb)
ESM 1 (DOCX 14 kb)


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Copyright information

© Institute of Microbiology, Academy of Sciences of the Czech Republic, v.v.i. 2019

Authors and Affiliations

  1. 1.Faculty of Natural Sciences, Department of Microbiology and VirologyComenius University in BratislavaBratislava 4Slovak Republic

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