Two xylose-fermenting glucose-derepressed Saccharomyces cerevisiae strains were constructed in order to investigate the influence of carbon catabolite repression on xylose metabolism. S. cerevisiae CPB.CR2 (Δmig1, XYL1, XYL2, XKS1) and CPB.MBH2 (Δmig1, Δmig2, XYL1, XYL2, XKS1) were analysed for changes in xylose consumption rate and ethanol production rate during anaerobic batch and chemostat cultivations on a mixture of 20 g l−1 glucose and 50 g l−1 xylose, and their characteristics were compared to the parental strain S. cerevisiae TMB3001 (XYL1, XYL2, XKS1). Improvement of xylose utilisation was limited during batch cultivations for the constructed strains compared to the parental strain. However, a 25% and 12% increased xylose consumption rate during chemostat cultivation was achieved for CPB.CR2 and CPB.MBH2, respectively. Furthermore, during chemostat cultivations of CPB.CR2, where the cells are assumed to grow under non-repressive conditions as they sense almost no glucose, invertase activity was lower during growth on xylose and glucose than on glucose only. The 3-fold reduction in invertase activity could only be attributed to the presence of xylose, suggesting that xylose is a repressive sugar for S. cerevisiae.
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Professor Bärbel Hahn-Hägerdal, Department of Applied Microbiology, Lund University is sincerely thanked for kindly providing the plasmid carrying the XYL1, XYL2 and XKS1 genes and the S. cerevisiae strain TMB3001. We are also indebted to Juana M. Gancedo for communicating her unpublished results on the capacity of xylose to cause catabolite repression. The work on carbon catabolite repression at the Centre for Process Biotechnology at the Technical University of Denmark is supported under the European Commission Framework V, contract no. QLK3-CT-1999-00080.
Author information Authors and AffiliationsCentre for Process Biotechnology, BioCentrum-DTU, Technical University of Denmark, 2800 Kgs., Lyngby, Denmark
C. Roca, M. B. Haack & L. Olsson
Correspondence to L. Olsson.
About this article Cite this articleRoca, C., Haack, M.B. & Olsson, L. Engineering of carbon catabolite repression in recombinant xylose fermenting Saccharomyces cerevisiae . Appl Microbiol Biotechnol 63, 578–583 (2004). https://doi.org/10.1007/s00253-003-1408-2
Received: 04 February 2003
Revised: 20 June 2003
Accepted: 28 June 2003
Published: 19 August 2003
Issue Date: May 2004
DOI: https://doi.org/10.1007/s00253-003-1408-2
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