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pPCK1 S. cerevisiae promoter

The upstream regulatory sequence to the gene PCK1, coding for Phosphoenolpyruvate carboxykinase. This promoter is induced by glycerol, acetate and ethanol (10x) [1].

Characterization

A promoter study was performed to characterize this promoter. The PCK1 promoter cloned into the replicative plasmid p416tef by replacing the existing pTEF1 promoter and adding GFP as a reporter gene. For the glucose conditions, the cells were grown in SD -URA + 2 % glucose media. The expression of GFP was measured using a plate reader with triplicate samples. The cells were also grown in SD -URA + 0.5 % acetate to compare the expression levels when acetate was the only carbon source, which is connected to our coculture project.

The experiment was also done with the promoters pAQR1, pGLN1, pPYCK2 and pTEF1 in the same way, and the results compared against each other. The raw data from the promoter study was normalized against OD600 of that sample, and the mean value of the negative control (cells with p416tef without GFP) was subtracted. The results are shown in Figure 1. In Figure 2 the results are normalized against the expression level of the pTEF1 promoter.

Figure 1. Expression levels of the promoters pAQR1, pGLN1, pPCK1, PYK2 and pTEF1 in glucose and acetate conditions. Error bar are shown as confidence intervals with p=0.05, using students t-test.

Figure 2. Expression levels of the promoters pAQR1, pGLN1, pPCK1, PYK2 and pTEF1 in glucose and acetate conditions relative the levels of pTEF1. Error bar are shown as confidence intervals with p=0.05, using students t-test.

Sequence and Features

References

[1] K. Weinhandl, M. Winkler, A. Glieder, and A. Camattari, “Carbon source dependent promoters in yeasts,” Microbial Cell Factories, vol. 13, no. 1, 2014.