Biotechnology Letters

, Volume 38, Issue 12, pp 2145–2151 | Cite as

Surface-engineered Saccharomyces cerevisiae displaying α-acetolactate decarboxylase from Acetobacter aceti ssp xylinum

  • Rudolf Cejnar
  • Kateřina Hložková
  • Pavel Kotrba
  • Pavel Dostálek
Original Research Paper
First Online:
Received:
Accepted:

Abstract

Objectives

To convert α-acetolactate into acetoin by an α-acetolactate decarboxylase (ALDC) to prevent its conversion into diacetyl that gives beer an unfavourable buttery flavour.

Results

We constructed a whole Saccharomyces cerevisiae cell catalyst with a truncated active ALDC from Acetobacter aceti ssp xylinum attached to the cell wall using the C-terminal anchoring domain of α-agglutinin. ALDC variants in which 43 and 69 N-terminal residues were absent performed equally well and had significantly decreased amounts of diacetyl during fermentation. With these cells, the highest concentrations of diacetyl observed during fermentation were 30 % less than those in wort fermented with control yeasts displaying only the anchoring domain and, unlike the control, virtually no diacetyl was present in wort after 7 days of fermentation.

Conclusions

Since modification of yeasts with ALDC variants did not affect their fermentation performance, the display of α-acetolactate decarboxylase activity is an effective approach to decrease the formation of diacetyl during beer fermentation.

Keywords

Acetobacter aceti Acetoin α-Acetolactate α-Acetolactate decarboxylase Beer Diacetyl Saccharomyces cerevsiae 
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Notes

Acknowledgments

This work was supported by the project TE02000177 “Centre for Innovative Use and Strengthening of Competitiveness of Czech Brewery Raw Materials and Products” of the Technology Agency of the Czech Republic.

Supporting information

Supplementary Table 1—Fermentation performance of S. cerevisiae W303-1A strains transformed with indicated plasmids.

Supplementary Fig. 1—Surface display of ALDC130 and ALDC208 fusions to V5-AGα1Cp expressed in S. cerevisiae W303-1A.

Supplementary material

10529_2016_2205_MOESM1_ESM.docx (203 kb)
Supplementary material 1 (DOCX 203 kb)

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Copyright information

© Springer Science+Business Media Dordrecht 2016

Authors and Affiliations

  1. 1.Department of Biotechnology, Faculty of Food and Biochemical TechnologyUniversity of Chemistry and Technology, PraguePrague 6-DejviceCzech Republic
  2. 2.Department of Biochemistry and Microbiology, Faculty of Food and Biochemical TechnologyUniversity of Chemistry and Technology, PraguePrague 6-DejviceCzech Republic

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