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Inter-strain inhibitory activity within the bacterial community of Australian vacuum-packaged beef Australian vacuum-packaged beef is recognised for its exceptionally long shelf-life

Citation

Zhang, P and Williams, ML and Ross, T and Bowman, JP and Tamplin, ML, Inter-strain inhibitory activity within the bacterial community of Australian vacuum-packaged beef Australian vacuum-packaged beef is recognised for its exceptionally long shelf-life, The Australian Society for Microbiology Annual Scientific Meeting, 7-10 July 2013, Adelaide, South Australia (2013) [Conference Extract]

Abstract

The global proteomic response of the non-starter lactic acid bacteria Lactobacillus casei strain GCRL163 under carbohydrate depletion was investigated to understand aspects of its survival following cessation of fermentation. The proteome of L. casei GCRL163 was analysed quantitatively after growth in modified MRS (with and without Tween 80) with different levels of lactose (0% lactose, starvation; 0.2% lactose, growth limiting; 1% lactose, non-growth limited control) using gel-based and gel-free proteomic analysis. Results revealed carbohydrate starvation lead to suppression of lactose and galactose catabolic pathways as well as nucleotide and protein synthesis. Enzymes of the glycolysis/gluconeogenesis pathway, amino acid synthesis, pyruvate metabolism, and citrate metabolism became more abundant as well as other carbohydrate catabolic pathways suggesting increased optimisation of intermediary metabolism and scavenging. Tween 80 did not affect growth yield, however, proteins related to fatty acid biosynthesis were repressed in the presence of Tween 80. The data suggests that L. casei adeptly switches to a scavenging mode by adjusting energetic requirements when carbohydrate starved and thus can sustain survival for weeks to months. Explaining the adaptation of L. casei during lactose starvation will assist efforts to maintain viability of L. casei and extend its utility as a beneficial dietary adjunct.

Item Details

Item Type:Conference Extract
Research Division:Biological Sciences
Research Group:Microbiology
Research Field:Bacteriology
Objective Division:Health
Objective Group:Public Health (excl. Specific Population Health)
Objective Field:Food Safety
Author:Zhang, P (Ms Peipei Zhang)
Author:Williams, ML (Ms Michelle Williams)
Author:Ross, T (Associate Professor Tom Ross)
Author:Bowman, JP (Associate Professor John Bowman)
Author:Tamplin, ML (Professor Mark Tamplin)
ID Code:84806
Year Published:2013
Deposited By:Tasmanian Institute of Agriculture
Deposited On:2013-06-03
Last Modified:2015-10-02
Downloads:0

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