Verstrepen and Steven Maere of the Flemish Institute for Biotechnology found that, compared with wild yeast, beer yeast has duplicated genes that help the organism break down maltotriose, a sugar found in beer mash. Many beer yeast strains have also evolved mutations that prevent production of 4-vinylguaiacol, an off-flavor in many beers. Meanwhile, because beer yeast is used continuously from one batch to another, it has lost the ability to reproduce sexually, the researchers found, a skill the organisms would need to survive and to adapt to stressful environments in the wild. By comparison, the team found that wine yeast still retains the ability to reproduce sexually, probably because wine making occurs only in autumn, leaving the yeast to fend for themselves during the rest of the year. /articles/94/i36/Beer-yeast-adapted-life-humans.html 20160912 The domesticated fermentative microorganism has evolved ways to reduce off-flavors and capitalize on a brew tank’s cozy, nutrient-rich environment Concentrates 94 36 /magazine/94/09436.html /departments/.html /collections/con.html Beer yeast adapted to life with humans Science & Technology Sarah Everts Beer-making yeast has a cozy life with humans.
by Sarah Everts |
September 12, 2016