Applied Microbiology and Biotechnology

, Volume 80, Issue 4, pp 579–587 | Cite as

Production of the aroma chemicals 3-(methylthio)-1-propanol and 3-(methylthio)-propylacetate with yeasts

  • M. M. W. Etschmann
  • P. Kötter
  • J. Hauf
  • W. Bluemke
  • K.-D. Entian
  • J. SchraderEmail author
Biotechnological Products and Process Engineering


Yeasts can convert amino acids to flavor alcohols following the Ehrlich pathway, a reaction sequence comprising transamination, decarboxylation, and reduction. The alcohols can be further derivatized to the acetate esters by alcohol acetyl transferase. Using l-methionine as sole nitrogen source and at high concentration, 3-(methylthio)-1-propanol (methionol) and 3-(methylthio)-propylacetate (3-MTPA) were produced with Saccharomyces cerevisiae. Methionol and 3-MTPA acted growth inhibiting at concentrations of >5 and >2 g L−1, respectively. With the wild type strain S. cerevisiae CEN.PK113-7D, 3.5 g L−1 methionol and trace amounts of 3-MTPA were achieved in a bioreactor. Overexpression of the alcohol acetyl transferase gene ATF1 under the control of a TDH3 (glyceraldehyde-3-phosphate dehydrogenase) promoter together with an optimization of the glucose feeding regime led to product concentrations of 2.2 g L−1 3-MTPA plus 2.5 g L−1 methionol. These are the highest concentrations reported up to now for the biocatalytic synthesis of these flavor compounds which are applied in the production of savory aroma compositions such as meat, potato, and cheese flavorings.


Flavor Compound Methylthio Sole Nitrogen Source Acetate Ester Propylacetate 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.



We thank Dr. Rinji Akada for the donation of the yeast strain RAK 1857, R.C. Treatt & Co. Ltd. for the donation of the 3-MTPA standard, and the German Federal Ministry for Food, Agriculture and Consumer Protection for funding the project (No. 22008803).


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Copyright information

© Springer-Verlag 2008

Authors and Affiliations

  • M. M. W. Etschmann
    • 1
  • P. Kötter
    • 2
  • J. Hauf
    • 3
  • W. Bluemke
    • 4
  • K.-D. Entian
    • 2
  • J. Schrader
    • 1
    Email author
  1. 1.Biochemical Engineering GroupFrankfurt am MainGermany
  2. 2.Institute of Molecular Biosciences, Molecular Genetics and Cellular MicrobiologyFrankfurt am MainGermany
  3. 3.SRD—Scientific Research and Development GmbHOberurselGermany
  4. 4.Evonik Degussa GmbHHanau-WolfgangGermany

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