Wisconsin Alumni Research Foundation

Animals, Agriculture & Food
Animals Agriculture Food
Non-GMO Maltotriose-Consuming Strains of Saccharomyces eubayanus
WARF: P180027US02

Inventors: Christopher Hittinger, EmilyClare Baker

The Wisconsin Alumni Research Foundation is seeking commercial partners interested in developing the first maltotriose-consuming strains of S. eubayanus, a novel cold-tolerant brewing yeast.
Saccharomyces eubayanus is the cold-tolerant parent yeast of the lager brewing yeast Saccharomyces pastorianus. In recent years there has been considerable interest in brewing with pure strains of S. eubayanus. However, all known wild strains lack the ability to consume maltotriose. Therefore, beers produced with pure S. eubayanus retain a sweet taste and remain low in alcohol content, two traits that are undesirable for commercial success. 
The Invention
UW-Madison researchers have produced maltotriose-consuming strains of pure S. eubayanus by repeatedly passaging wild strains for hundreds of generations in 0.1% glucose and 2% maltotriose, or 2% maltose. After directed evolution, some strains evolved the ability to consume maltotriose as the sole carbon source. This trait has been shown by the researchers to be stable and genetically heritable, and it is likely encoded by a single genetic locus. 
  • Novel brewing yeast that is cold-tolerant
Key Benefits
  • These strains are descendants of the wild S. eubayanus strain that is the closest relative of the lager yeasts.
  • No pure strains of S. eubayanus that consume maltotriose exist
Additional Information
For More Information About the Inventors
For current licensing status, please contact Jennifer Gottwald at [javascript protected email address] or 608-960-9854