Antagonistic regulation by global transcription factors Tup1p, and Cyc8p of Flo11 and Flo11 -dependent phenotypes in wild yeast

Nguyen Van, Phu

Biofilms are a common mode of yeast growth in which cells adhere to each other and adhere to abiotic surfaces to form complex multicellular structures. Living together in biofilms provides cells with several beneficial features compared to planktonic cells. Undoubtedly, protection and resistance are advantages of life inside colony biofilms. Biofilms are found in many environments and play many important roles in commercial industries. However, biofilms can also be extremely dangerous in clinical settings. There is thus great interest in studying biofilms and how to eliminate them. In this study, we used wild yeast Saccharomyces cerevisiae colony biofilm as an ideal system to investigate potential functions of the yeast Cyc8-Tup1 transcriptional corepressor complex in the regulation of yeast adhesion, and biofilm formation on agar and at solid-liquid interfaces. Unexpectedly, we have found that Cyc8p and Tup1p antagonistically control the formation of structured biofilm colonies on agar and FLO11 expression. Cyc8p itself acts as a key repressor of FLO11, whereas Tup1p promotes the formation of biofilm colonies and induces FLO11 expression by inhibiting the repressive function of Cyc8p and preventing Flo11p degradation possibly by inhibiting an extracellular protease. In addition, other features...

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