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Multiple alpha-glucoside transporter genes in brewer's yeast
L Jespersen1, L B Cesar, P G Meaden
1Department of Dairy and Food Science, Royal Veterinary and Agricultural University, 1958 Frederiksberg C, Denmark.
This study investigated the genetics of sugar uptake in brewer's yeast, finding variations in maltose and maltotriose transporter genes across different strains. These genetic differences are crucial for understanding yeast fermentation performance.
Area of Science:
- * Molecular Biology
- * Yeast Genetics
- * Fermentation Science
Background:
- * Maltose and maltotriose are key fermentable sugars in brewer's wort, significantly impacting yeast fermentation.
- * Genetic information regarding maltose and maltotriose uptake in brewing yeast strains is limited.
- * Understanding these sugar transporters is vital for optimizing brewing processes.
Purpose of the Study:
- * To examine the alleles of maltose and maltotriose transporter genes in 30 brewing yeast strains.
- * To identify the presence and distribution of MAL loci and AGT1 gene sequences.
- * To explore the genetic basis of sugar uptake in ale and lager yeast.
Main Methods:
- * Analysis of 30 brewing yeast strains (5 ale, 25 lager).
- * Hybridization of gene probes to chromosome blots to detect MAL and AGT1 gene sequences.
- * Comparative genetic analysis of sugar transporter genes.
Main Results:
- * Most strains contained MAL11 and MAL31 sequences; MAL61 was absent in all strains.
- * MAL21 was absent in ale strains and a subset of lager strains.
- * AGT1 sequences were detected in nearly all strains, with identified homologues in lager strains mapped to specific chromosomes.
Conclusions:
- * Significant genetic diversity exists in maltose and maltotriose transporter genes among brewing yeasts.
- * The presence and location of MAL loci and AGT1 homologues vary, influencing sugar uptake.
- * These genetic variations likely evolved under selective pressures in brewing environments.
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