Reference: Puig S and Perez-Ortin JE (2000) Stress response and expression patterns in wine fermentations of yeast genes induced at the diauxic shift. Yeast 16(2):139-48

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Abstract


During wine fermentation yeasts quickly reach a stationary phase, where cells are metabolically active by consuming sugars present in grape must. It is, consequently, of great interest at this stage to identify suitable gene promoters that may be used to induce the expression of genes with enological applications. With this aim, we have studied a group of genes showing an induction peak at the diauxic shift, and possessing stress response elements (STRE) at their promoters. We have determined their induction levels under individualized stress conditions, such as carbon source starvation or high salt concentrations. In all the cases studied, the activation and/or basal transcription are dependent on the transcriptional factors Msn2p and Msn4p. We have analysed the expression patterns and mRNA levels during wine fermentation, and have found that they are all activated at the stationary phase. Finally, we have identified SPI1, a new highly expressed yeast gene which is specifically induced at the stationary phase of both microvinification and laboratory growth conditions. Copyright 2000 John Wiley & Sons, Ltd.

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Puig S, Perez-Ortin JE
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