Abstract
In industrial processes, during human infection, and in nature, lactic acid bacteria (LAB) are frequently exposed to adverse environmental conditions. Among the challenges posed by an ever-changing environment, osmotic stress is a prominent constraint that can stop cell growth and activate specific mechanisms that prevent cell death. This chapter will discuss the current knowledge about the molecular players that allow LAB to contend with hyper- and hypoosmotic stresses. We summarize how these bacteria control turgor by actively modulating the pool of osmotically active solutes in their cytoplasm. The major adaptive strategy to high osmolality is the intracellular accumulation of organic compounds, which are both effective osmoprotectants (efficient at increasing cytoplasmic osmolality, and growth rate) and compatible solutes (without deleterious effects on biopolymer functions, including stability and activity). Coupled with the movement and accumulation of solutes are the induction of stress proteins and the transcriptional regulation of key enzymes. In addition, the emerging mechanisms that sense and transduce the osmotic signal in the cell will be discussed.
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Dr. Marguerite Dols and Prof. Mohamed Jebbar are gratefully acknowledged for their helpful comments as well as Cate Evans for her help in preparing the manuscript.
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Le Marrec, C. (2011). Responses of Lactic Acid Bacteria to Osmotic Stress. In: Tsakalidou, E., Papadimitriou, K. (eds) Stress Responses of Lactic Acid Bacteria. Food Microbiology and Food Safety. Springer, Boston, MA. https://doi.org/10.1007/978-0-387-92771-8_4
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