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Effects of Gene Orientation and Use of Multiple Promoters on the Expression of XYL1 and XYL2 in Saccharomyces cerevisiae

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Abstract

Orientation of adjacent genes has been reported to affect their expression in eukaryotic systems, and metabolic engineering also often makes repeated use of a few promoters to obtain high expression. To improve transcriptional control in heterologous expression, we examined how these factors affect gene expression and enzymatic activity in Saccharomyces cerevisiae. We assembled d-xylose reductase (XYL1) and d-xylitol dehydrogenase (XYL2) in four ways. Each pair of genes was placed in two different tandem (1→2→ or ←1←2), convergent (1→←2), and divergent (←1 2→) orientations in autonomous plasmids. The TEF1 promoter was used to drive XYL1 and the TDH3 promoter to drive XYL2 in each of the constructs. The effects of gene orientation on growth, transcription, and enzyme activity were analyzed. The transcription level as measured by quantitative PCR (q-PCR) correlated with enzyme activities, but our data did not show a significant effect of gene orientation. To test the possible dilution of promoter strength due to multiple use of the same promoter, we examined the level of expression of XYL1 driven by either the TEF1 or TDH3 promoter when carried on a single copy plasmid. We then co-expressed XYL2 from either a single or multicopy plasmid, which was also driven by the same promoter. XYL2 transcript and enzyme expression increased with plasmid copy number, while the expression of XYL1 was constant regardless of the number of other TEF1 or TDH3 promoters present in the cell. According to our data, there is no significant effect of gene orientation or multiple promoter use on gene transcription and translation when genes are expressed from plasmids; however, other factors could affect expression of adjacent genes in chromosomes.

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Author notes

  1. José Laplaza

    Present address: Cargill, Minneapolis, MN, USA

Authors and Affiliations

  1. Molecular and Environmental Toxicology Center, University of Wisconsin, Madison, WI, 53705, USA

    Ju Yun Bae & Thomas W. Jeffries

  2. USDA Forest Service, Forest Products Laboratory, 1 Gifford Pinchot Drive, Madison, WI, 53726, USA

    José Laplaza & Thomas W. Jeffries

Authors
  1. Ju Yun Bae
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  2. José Laplaza
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  3. Thomas W. Jeffries
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Correspondence to Thomas W. Jeffries.

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Bae, J.Y., Laplaza, J. & Jeffries, T.W. Effects of Gene Orientation and Use of Multiple Promoters on the Expression of XYL1 and XYL2 in Saccharomyces cerevisiae . Appl Biochem Biotechnol 145, 69–78 (2008). https://doi.org/10.1007/s12010-007-8076-0

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  • DOI: https://doi.org/10.1007/s12010-007-8076-0

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