Maltose and maltotriose utilisation by group I strains of the hybrid lager yeast Saccharomyces pastorianus.

ABSTRACT: Brewer's wort is a challenging environment for yeast as it contains predominantly α-glucoside sugars. There exist two subgroups of the lager yeast Saccharomyces pastorianus which differ in sugar utilisation. We performed wort fermentations and compared representative strains from both groups with respect to their ability to transport and ferment maltose and maltotriose. Additionally, we mapped the transporters MALx1, AGT1, MPHx and MTT1 by Southern blotting. Contrary to previous observations, group I comprises a diverse set of strains, with varying ability to transport and ferment maltotriose. Of the eight group I strains, three efficiently utilised maltotriose, a property enabled by the presence of transmembrane transporters SeAGT1 and MTT1 A58, a variant of the group I type strain (CBS15

SUBMITTER: Magalhaes F 

PROVIDER: S-EPMC5815069 | biostudies-literature | 2016 Aug

REPOSITORIES: biostudies-literature