Journal of Microbiology and Biotechnology

The Korean Society for Microbiology and Biotechnology (한국미생물·생명공학회)
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Effect of Exogenous Proline on Metabolic Response of Tetragenococcus halophilus under Salt Stress

  • He, Guiqiang (College of Light Industry, Textile & Food Engineering, Sichuan University) ;
  • Wu, Chongde (College of Light Industry, Textile & Food Engineering, Sichuan University) ;
  • Huang, Jun (College of Light Industry, Textile & Food Engineering, Sichuan University) ;
  • Zhou, Rongqing (College of Light Industry, Textile & Food Engineering, Sichuan University)
  • Received : 2017.02.23
  • Accepted : 2017.06.23
  • Published : 2017.09.28
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Abstract

This study investigated the effect of proline addition on the salt tolerance of Tetragenococcus halophilus. Salt stress led to the accumulation of intracellular proline in T. halophilus. When 0.5 g/l proline was added to hyperhaline medium, the biomass increased 34.6% (12% NaCl) and 27.7% (18% NaCl) compared with the control (without proline addition), respectively. A metabolomic approach was employed to reveal the cellular metabolic responses and protective mechanisms of proline upon salt stress. The results showed that both the cellular membrane fatty acid composition and metabolite profiling responded by increasing unsaturated and cyclopropane fatty acid proportions, as well as accumulating some specific intracellular metabolites (environmental stress protector). Higher contents of intermediates involved in glycolysis, the tricarboxylic acid cycle, and the pentose phosphate pathway were observed in the cells supplemented with proline. In addition, addition of proline resulted in increased concentrations of many organic osmolytes, including glutamate, alanine, citrulline, N-acetyl-tryptophan, and mannitol, which may be beneficial for osmotic homeostasis. Taken together, results in this study suggested that proline plays a protective role in improving the salt tolerance of T. halophilus by regulating the related metabolic pathways.

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