Comparative proteomic analysis of a potentially probiotic Lactobacillus pentosus MP-10 for the identification of key proteins involved in antibiotic resistance and biocide tolerance

del Carmen Casado Muñoz, María and Benomar, Nabil and Ennahar, Saïd and Horvatovich, Peter and Lavilla Lerma, Leyre and Knapp, Charles W. and Gálvez, Antonio and Abriouel, Hikmate (2016) Comparative proteomic analysis of a potentially probiotic Lactobacillus pentosus MP-10 for the identification of key proteins involved in antibiotic resistance and biocide tolerance. International Journal of Food Microbiology, 222. pp. 8-15. ISSN 0168-1605

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    Abstract

    Probiotic bacterial cultures require resistance mechanisms to avoid stress-related responses under challenging environmental conditions; however, understanding these traits is required to discern their utility in fermentative food preparations, versus clinical and agricultural risk. Here, we compared the proteomic responses of Lactobacillus pentosus MP-10, a potentially probiotic lactic acid bacteria isolated from brines of naturally fermented Aloreña green table olives, exposed to sub-lethal concentrations of antibiotics (amoxicillin, chloramphenicol and tetracycline) and biocides (benzalkonium chloride and triclosan). Several genes became differentially expressed depending on antimicrobial exposure, such as the up-regulation of protein synthesis, and the down-regulation of carbohydrate metabolism and energy production. The antimicrobials appeared to have altered Lb. pentosus MP-10 physiology to achieve a gain of cellular energy for survival. For example, biocide-adapted Lb. pentosus MP-10 exhibited a down-regulated phosphocarrier protein HPr and an unexpressed oxidoreductase. However, protein synthesis was over-expressed in antibiotic- and biocide-adapted cells (ribosomal proteins and glutamyl-tRNA synthetase), possibly to compensate for damaged proteins targeted by antimicrobials. Furthermore, stress proteins, such as NADH peroxidase (Npx) and a small heat shock protein, were only overexpressed in antibiotic-adapted Lb. pentosus MP-10. Results showed that adaptation to sub-lethal concentrations of antimicrobials could be a good way to achieve desirable robustness of the probiotic Lb. pentosus MP-10 to various environmental and gastrointestinal conditions (e.g., acid and bile stresses).