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Label-free quantitative proteomic analysis reveals the lifestyle of Lactobacillus hordei in the presence of Sacchromyces cerevisiae.
International Journal of Food Microbiology 2019 January 26
Water kefir is a fermented beverage, which is traditionally prepared from sucrose, kefir grains, dried or fresh fruits, and water. L. hordei and S. cerevisiae are isolated as predominant and stable species of lactic acid bacteria and yeasts, respectively. In this study we demonstrate that label free quantitative proteomics is useful to study microbial interaction along the response of co-cultivated L. hordei TMW 1.1822 in the presence of S. cerevisiae TMW 3.221 as compared with their single cultures in a water kefir model. It is shown and L. hordei responds to S. cerevisiae in many respects revealing a mutualistic relationship. The data suggest that L. hordei responds to the presence of S. cerevisiae with adjustment of intracellular redox reactions controlled of proteins, which are part of Rex regulons and proteins involved in the glycolytic pathway and energy fermentation. An NADH, H+ -driven metabolic switch to preferential production of butanediol instead of acetate or lactate, and up-regulation of arginine deiminase, alleviated acid stress and concomitantly protected S. cerevisiae against an acidic environment, which L. hordei generated in single culture. Moreover, the data suggest that the presence of S. cerevisiae in the nitrogen and fatty acids limited environment of the water kefir facilitated and improved the growth of L. hordei by delivering gluconate, fructose, amino acids, fatty acids or substrates for their biosynthesis. Up-regulation of the OppABCDF peptide transport and enzymes involved in amino acid metabolism indicates enhanced peptide uptake, as well as cross-feeding of L. hordei by glutamine, glutamate, histidine, tryptophan, methionine, proline, tryptophan delivered by S. cerevisiae.
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