alexa The effect of low pH on protein expression by the probiotic bacterium Lactobacillus reuteri.
Veterinary Sciences

Veterinary Sciences

Research & Reviews: Journal of Veterinary Sciences

Author(s): Lee K, Lee HG, Pi K, Choi YJ

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Abstract The ability of a lactic acid bacterium to survive passage through the gastrointestinal tract is a key point in its function as a probiotic. In this study, protein synthesis by the probiotic bacterium, Lactobacillus reuteri, was analyzed under transiently decreased pH conditions. L. reuteri cells grown to the midexponential growth phase at 37 degrees C were exposed to transient (1 h) low-pH stresses from pH 6.8 to pH 5.0, 4.5, or 4.0. 2-DE allowed us to identify 40 common proteins that were consistently and significantly altered under all three low-pH conditions. PMF was used to identify these 40 proteins, and functional annotation allowed them to be distributed to six major classes: (i) transport and binding proteins; (ii) transcription-translation; (iii) nucleotide metabolism and amino acid biosynthesis; (iv) carbon energy metabolism; (v) pH homeostasis and stress; and (vi) unassigned. These findings provide new insight into the inducible mechanisms underlying the capacity of gastrointestinal L. reuteri to tolerate acid stress. This article was published in Proteomics and referenced in Research & Reviews: Journal of Veterinary Sciences

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