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Title: Industrial brewing yeast engineered for the production of primary flavor determinants in hopped beer

Abstract

Flowers of the hop plant provide both bitterness and "hoppy" flavor to beer. Hops are, however, both a water and energy intensive crop and vary considerably in essential oil content, making it challenging to achieve a consistent hoppy taste in beer. Here, we report that brewer's yeast can be engineered to biosynthesize aromatic monoterpene molecules that impart hoppy flavor to beer by incorporating recombinant DNA derived from yeast, mint, and basil. Whereas metabolic engineering of biosynthetic pathways is commonly enlisted to maximize product titers, tuning expression of pathway enzymes to affect target production levels of multiple commercially important metabolites without major collateral metabolic changes represents a unique challenge. By applying state-of-the-art engineering techniques and a framework to guide iterative improvement, strains are generated with target performance characteristics. Finally, beers produced using these strains are perceived as hoppier than traditionally hopped beers by a sensory panel in a double-blind tasting.

Authors:
 [1];  [2];  [3];  [4];  [1];  [5];  [6];  [7]; ORCiD logo [6];  [5];  [8]; ORCiD logo [4]; ORCiD logo [9]
  1. Univ. of California, Berkeley, CA (United States). California Inst. of Quantitative Biosciences (QB3); Joint BioEnergy Inst. (JBEI), Emeryville, CA (United States)
  2. Joint BioEnergy Inst. (JBEI), Emeryville, CA (United States); Univ. of California, Berkeley, CA (United States). Dept. of Plant and Microbial Biology; Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  3. Univ. of California, Berkeley, CA (United States). Dept. of Bioengineering
  4. Joint BioEnergy Inst. (JBEI), Emeryville, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Biological Systems and Engineering Division; DOE Agile BioFoundry, Emeryville, CA (United States)
  5. Joint BioEnergy Inst. (JBEI), Emeryville, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Biological Systems and Engineering Division
  6. Univ. of California, Davis, CA (United States). Dept. of Food Science and Technology
  7. Lagunitas Brewing Company, Petaluma, CA (United States)
  8. Joint BioEnergy Inst. (JBEI), Emeryville, CA (United States); Univ. of California, Berkeley, CA (United States). Dept. of Plant and Microbial Biology; Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Environmental Genomics and Systems Biology Division
  9. Univ. of California, Berkeley, CA (United States). California Inst. of Quantitative Biosciences (QB3); Joint BioEnergy Inst. (JBEI), Emeryville, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Biological Systems and Engineering Division; Univ. of California, Berkeley, CA (United States). Dept. of Bioengineering; Univ. of California, Berkeley, CA (United States). Dept. of Chemical and Biomolecular Engineering; Technical Univ. of Denmark, Hellerup (Denmark). Novo Nordisk Foundation Center for Sustainability
Publication Date:
Research Org.:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Biological and Environmental Research (BER)
OSTI Identifier:
1457017
Grant/Contract Number:  
AC02-05CH11231; 1722376
Resource Type:
Accepted Manuscript
Journal Name:
Nature Communications
Additional Journal Information:
Journal Volume: 9; Journal Issue: 1; Journal ID: ISSN 2041-1723
Publisher:
Nature Publishing Group
Country of Publication:
United States
Language:
English
Subject:
59 BASIC BIOLOGICAL SCIENCES

Citation Formats

Denby, Charles M., Li, Rachel A., Vu, Van T., Costello, Zak, Lin, Weiyin, Chan, Leanne Jade G., Williams, Joseph, Donaldson, Bryan, Bamforth, Charles W., Petzold, Christopher J., Scheller, Henrik V., Martin, Hector Garcia, and Keasling, Jay D. Industrial brewing yeast engineered for the production of primary flavor determinants in hopped beer. United States: N. p., 2018. Web. doi:10.1038/s41467-018-03293-x.
Denby, Charles M., Li, Rachel A., Vu, Van T., Costello, Zak, Lin, Weiyin, Chan, Leanne Jade G., Williams, Joseph, Donaldson, Bryan, Bamforth, Charles W., Petzold, Christopher J., Scheller, Henrik V., Martin, Hector Garcia, & Keasling, Jay D. Industrial brewing yeast engineered for the production of primary flavor determinants in hopped beer. United States. https://doi.org/10.1038/s41467-018-03293-x
Denby, Charles M., Li, Rachel A., Vu, Van T., Costello, Zak, Lin, Weiyin, Chan, Leanne Jade G., Williams, Joseph, Donaldson, Bryan, Bamforth, Charles W., Petzold, Christopher J., Scheller, Henrik V., Martin, Hector Garcia, and Keasling, Jay D. Tue . "Industrial brewing yeast engineered for the production of primary flavor determinants in hopped beer". United States. https://doi.org/10.1038/s41467-018-03293-x. https://www.osti.gov/servlets/purl/1457017.
@article{osti_1457017,
title = {Industrial brewing yeast engineered for the production of primary flavor determinants in hopped beer},
author = {Denby, Charles M. and Li, Rachel A. and Vu, Van T. and Costello, Zak and Lin, Weiyin and Chan, Leanne Jade G. and Williams, Joseph and Donaldson, Bryan and Bamforth, Charles W. and Petzold, Christopher J. and Scheller, Henrik V. and Martin, Hector Garcia and Keasling, Jay D.},
abstractNote = {Flowers of the hop plant provide both bitterness and "hoppy" flavor to beer. Hops are, however, both a water and energy intensive crop and vary considerably in essential oil content, making it challenging to achieve a consistent hoppy taste in beer. Here, we report that brewer's yeast can be engineered to biosynthesize aromatic monoterpene molecules that impart hoppy flavor to beer by incorporating recombinant DNA derived from yeast, mint, and basil. Whereas metabolic engineering of biosynthetic pathways is commonly enlisted to maximize product titers, tuning expression of pathway enzymes to affect target production levels of multiple commercially important metabolites without major collateral metabolic changes represents a unique challenge. By applying state-of-the-art engineering techniques and a framework to guide iterative improvement, strains are generated with target performance characteristics. Finally, beers produced using these strains are perceived as hoppier than traditionally hopped beers by a sensory panel in a double-blind tasting.},
doi = {10.1038/s41467-018-03293-x},
journal = {Nature Communications},
number = 1,
volume = 9,
place = {United States},
year = {Tue Mar 20 00:00:00 EDT 2018},
month = {Tue Mar 20 00:00:00 EDT 2018}
}

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Figures / Tables:

Fig. 1 Fig. 1: Engineering brewer’s yeast to express monoterpene biosynthetic pathways thereby replacing flavor hop addition. a During the brewing process, S. cerevisiae converts wort—a barley extract solution rich in fermentable sugars—into ethanol and other by-products. Hops are added immediately before, during, or after fermentation to impart “hoppy” flavor. Engineered strainsmore » produce linalool and geraniol, primary flavor components of hoppy beer, thereby replacing hop additions. b Six full-length plant-derived linalool synthase genes, as well as PTS-truncated variants, were expressed on high-copy plasmids. Full-length genes and PTS-truncated genes predicted by either ChloroP (C) or the RR-heuristic method (RR) are indicated by colored lines. c Error bars correspond to mean ± standard deviation of three biological replicates. Asterisks indicate statistically significant increases in monoterpene production compared with the control strain (Y) as determined by a t-test using p-value <0.025. The LIS from the California wildflower Clarkia breweri has been shown to increase production of linalool when heterologously expressed in plants and in yeast. However, when C. breweri LIS was expressed, either with native codons (nCb) or “yeast-optimized” codons (Cb), linalool was not detected. The Mentha citrata LIS (Mc) truncated at the RR motif was identified as sufficiently active to allow for monoterpene production at levels characteristic of commercial beer and was chosen for integration into brewer’s yeast strains« less

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Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.