Construction of amylolytic industrial brewing yeast strain with high glutathione content for manufacturing beer with improved anti-staling capability and flavor.

Abstract:

:Glutathione in beer works as the main antioxidant compounds which correlates with beer flavor stability. High residual sugars in beer contribute to major non-volatile components which correlate to high caloric content. In this work, Saccharomyces cerevisiae GSH1 gene encoding glutamylcysteine synthetase and Scharomycopsis fibuligera ALP1 gene encoding alpha-amylase were co-expressed in industrial brewing yeast strain Y31 targeting at alpha-acetolactate synthase (AHAS) gene (ILV2) and alcohol dehydrogenase gene (ADH2), and new recombinant strain TY3 was constructed. The glutathione content from the fermentation broth of TY3 increased to 43.83 mg/l compared to 33.34 mg/l from Y31. The recombinant strain showed high alpha-amylase activity and utilized more than 46% of starch after 5 days growing on starch as sole carbon source. European Brewery Convention tube fermentation tests comparing the fermentation broth of TY3 and Y31 showed that the flavor stability index increased to 1.3 fold and residual sugar concentration were reduced by 76.8%, respectively. Due to the interruption of ILV2 gene and ADH2 gene, the amounts of off-flavor compounds diacetyl and acetaldehyde were reduced by 56.93% and 31.25%, comparing with the amounts of these from Y31 fermentation broth. In addition, as no drug-resistance genes were introduced to new recombinant strain, consequently, it should be more suitable for use in beer industry because of its better flavor stability and other beneficial characteristics.

journal_name

J Microbiol Biotechnol

authors

Wang J,Wang ZY,He XP,Zhang BR

doi

10.4014/jmb.1004.04007

subject

Has Abstract

pub_date

2010-11-01 00:00:00

pages

1539-45

issue

11

eissn

1017-7825

issn

1738-8872

pii

JMB020-11-12

journal_volume

20

pub_type

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