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- W2167798145 abstract "ABSTRACT Freezing and lyophilization are common methods used for preservation and storage of microorganisms during the production of concentrated starter cultures destined for industrial fermentations or product formulations. The compatible solute trehalose has been widely reported to protect bacterial, yeast and animal cells against a variety of environmental stresses, particularly freezing and dehydration. Analysis of the Lactobacillus acidophilus NCFM genome revealed a putative trehalose utilization locus consisting of a transcriptional regulator, treR ; a trehalose phosphoenolpyruvate transferase system (PTS) transporter, treB ; and a trehalose-6-phosphate hydrolase, treC . The objective of this study was to characterize the tre locus in L. acidophilus and determine whether or not intracellular uptake of trehalose contributes to cryoprotection. Cells subjected to repeated freezing and thawing cycles were monitored for survival in the presence of various concentrations of trehalose. At 20% trehalose a 2-log increase in survival was observed. The trehalose PTS transporter and trehalose hydrolase were disrupted by targeted plasmid insertions. The resulting mutants were unable to grow on trehalose, indicating that both trehalose transport into the cell via a PTS and hydrolysis via a trehalose-6-phosphate hydrolase were necessary for trehalose fermentation. Trehalose uptake was found to be significantly reduced in the transporter mutant but unaffected in the hydrolase mutant. Additionally, the cryoprotective effect of trehalose was reduced in these mutants, suggesting that intracellular transport and hydrolysis contribute significantly to cryoprotection." @default.
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- W2167798145 date "2006-02-01" @default.
- W2167798145 modified "2023-10-05" @default.
- W2167798145 title "Characterization of the <i>tre</i> Locus and Analysis of Trehalose Cryoprotection in <i>Lactobacillus acidophilus</i> NCFM" @default.
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- W2167798145 doi "https://doi.org/10.1128/aem.72.2.1218-1225.2006" @default.
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