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The Transcriptome and Flux Profiling of Crabtree-Negative Hydroxy Acid-Producing Strains of Saccharomyces cerevisiae Reveals Changes in the Central Carbon Metabolism

Journal Article · · Biotechnology Journal
 [1];  [1];  [1];  [1];  [2];  [2];  [3];  [4];  [1]
  1. Technical Univ. of Denmark, Kongens Lyngby (Denmark)
  2. Aachen Univ. (Germany)
  3. Univ. of California, Berkeley, CA (United States)
  4. Technical Univ. of Denmark, Kongens Lyngby (Denmark); Joint BioEnergy Inst. (JBEI), Emeryville, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Univ. of California, Berkeley, CA (United States); Shenzhen Inst. for Advanced Technologies (China)
Saccharomyces cerevisiae (S. cerevisiae) is the yeast cell factory of choice for the production of many biobased chemicals. However, it is a Crabtree-positive yeast and so shuttles a large portion of carbon into ethanol. Ethanol formation can be eliminated by deleting pyruvate decarboxylase (PDC) activity. It is not yet well understood how PDC-negative yeasts are affected when engineered to produce other products than ethanol. In this study, pathways are introduced for the production of three hydroxy acids (lactic, malic, or 3-hydroxypropionic acid [3HP]) into an evolved PDC-negative strain. These strains are characterized via transcriptome and flux profiling to elucidate the effects that the production of these hydroxy acids has on the host strain. Expression of lactic and malic acid biosynthesis pathways improved the maximum specific growth rate (μmax) of the strain by 64% and 20%, respectively, presumably due to nicotinamide adenine dinucleotide regeneration. All strains show a very high flux (> 90% of glucose uptake) into the oxidative pentose phosphate pathway under batch fermentation conditions. The study, for the first time, directly compares the flux and transcriptome profiles of several hydroxy acid-producing strains of an evolved PDC-negative S. cerevisiae and suggests directions for future metabolic engineering.
Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
European Research Council; Novo Nordisk Foundation; USDOE Office of Science (SC)
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
1604701
Journal Information:
Biotechnology Journal, Journal Name: Biotechnology Journal Journal Issue: 9 Vol. 14; ISSN 1860-6768
Publisher:
WileyCopyright Statement
Country of Publication:
United States
Language:
English

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