Accumulation and role of compatible solutes in fast-growing Salinivibrio costicola subsp. yaniae

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Abstract:

The moderately halophilic bacterium Salinivibrio costicola subsp. yaniae showed an extremely fast growth rate. Optimal growth was observed in artificial seawater containing 1.4 mol/L NaCl and in MM63 media containing 0.6 mol/L NaCl. We analyzed a variety of compatible solutes that had accumulated in this strain grown in the media. The supplementation effect of the compatible solutes glycine betaine, glutamate, and ectoine to the growth of S. costicola subsp. yaniae was examined. Glycine betaine and glutamate had no supplementation effect on the fast growth rate. Growth of salt-sensitive mutants MU1 and MU2, both of which were defective in the ability to synthesize ectoine, was not observed in MM63 medium in the presence of more than 1.0 mol/L NaCl. From these data, we conclude that ectoine was the predominant compatible solute synthesized in this bacterium that effected an extremely fast growth rate.

La bactérie modérément halophile Salinivibrio costicola subsp. yaniae possède un taux de croissance extrêmement rapide. La croissance optimale a été observée en eau de mer artificielle contenant 1,4 mol/L de NaCl, ainsi que dans le milieu MM63 contenant 0,6 mol/L de NaCl. Nous avons analysé l’effet d’une variété de solutés compatibles accumulés par cette souche cultivée dans le milieu MM63. L’effet d’une supplémentation en glycine bétaïne, en glutamate et en ectoïne sur la croissance de S. costicola subsp. yaniae a été examinée. La glycine bétaïne et le glutamate ne contribuaient pas à la croissance rapide de la bactérie. Les mutants sensibles au sel MU1 et MU2, tous deux déficients en synthèse d’ectoïne, ne croissaient pas dans le milieu MM63 contenant plus de 1,0 mol/L NaCl. Nous concluons à partir de ces données que l’ectoïne, le principal soluté compatible synthétisé par cette bactérie, joue un rôle important dans sa croissance extrêmement rapide.

Document Type: Research Article

Publication date: December 1, 2010

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  • Published since 1954, this monthly journal contains new research in the field of microbiology including applied microbiology and biotechnology; microbial structure and function; fungi and other eucaryotic protists; infection and immunity; microbial ecology; physiology, metabolism and enzymology; and virology, genetics, and molecular biology. It also publishes review articles and notes on an occasional basis, contributed by recognized scientists worldwide.
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