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Applied Microbiology and Biotechnology

, Volume 81, Issue 6, pp 1087–1096 | Cite as

Aconitase overexpression changes the product ratio of citric acid production by Yarrowia lipolytica

  • Martina HolzEmail author
  • André Förster
  • Stephan MauersbergerEmail author
  • Gerold Barth
Applied Genetics and Molecular Biotechnology

Abstract

The yeast Yarrowia lipolytica secretes high amounts of various organic acids, like citric acid (CA) and isocitric acid (ICA) under an excess of carbon source and several conditions of growth limitation. Depending on the carbon source used, Y. lipolytica strains produce a mixture of CA and ICA in a characteristic ratio. To examine whether this CA/ICA product ratio can be influenced by gene–dose-dependent overexpression of aconitase (ACO)-encoding gene ACO1, a recombinant Y. lipolytica strain was constructed containing multiple copies of ACO1. The high-level expression of ACO in the ACO1 multicopy integrative transformant resulted in a shift of the CA/ICA product pattern into the direction of ICA. On sunflower oil, a striking increase of the ICA proportion from 35–49% to 66–71% was observed compared to wild-type strains without influencing the total amount of acids (CA and ICA) produced. On glycerol, glucose or sucrose, the ICA proportion increased only moderately from 10–12% to 13–17%. This moderate shift into the direction of ICA was also observed in an icl1-defective strain.

Keywords

Aconitase ACO1 overexpression Isocitric acid Citric acid Product ratio Yarrowia lipolytica 

Notes

Acknowledgements

This work was partially supported by the Sächsisches Staatsministerium für Umwelt und Landwirtschaft (SMUL) of the Land Saxony, Germany (Grant No. 138811.61/89). We would like to thank Prof. Dr. Rödel (Institute of Genetics, TU Dresden) for providing the Aco1p-antibody.

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Copyright information

© Springer-Verlag 2008

Authors and Affiliations

  1. 1.Institut für MikrobiologieTechnische Universität DresdenDresdenGermany

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