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Genomic Insight into the Salt Tolerance of Enterococcus faecium, Enterococcus faecalis and Tetragenococcus halophilus

Journal of Microbiology and Biotechnology 2019년 29권 10호 p.1591 ~ 1602
 ( Heo So-Jeong ) - Dongduk Women’s University Department of Food and Nutrition

 ( Lee Jung-Min ) - Dongduk Women’s University Department of Food and Nutrition
 ( Lee Jong-Hoon ) - Kyonggi University Department of Food Science and Biotechnlogy
 ( Jeong Do-Won ) - Dongduk Women’s University Department of Food and Nutrition

Abstract


To shed light on the genetic basis of salt tolerance in Enterococcus faecium, Enterococcus faecalis, and Tetragenococcus halophilus, we performed comparative genome analysis of 10 E. faecalis, 11 E. faecium, and three T. halophilus strains. Factors involved in salt tolerance that could be used to distinguish the species were identified. Overall, T. halophilus contained a greater number of potassium transport and osmoprotectant synthesis genes compared with the other two species. In particular, our findings suggested that T. halophilus may be the only one among the three species capable of synthesizing glycine betaine from choline, cardiolipin from glycerol and proline from citrate. These molecules are well-known osmoprotectants; thus, we propose that these genes confer the salt-tolerance of T. halophilus.

키워드

Enterococcus faecium; Enterococcus faecalis; Tetragenococcus halophilus; Salt tolerance; Pan-genome
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