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Osmoregulation in Escherichia coli by accumulation of organic osmolytes: betaines, glutamic acid, and trehalose

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Abstract

It has been shown previously that externally added glycine betaine is accumulated in Escherichia coli in response to the external osmotic strength. Here we have shown, by using nuclear magnetic resonance spectroscopy and radiochemical methods, that E. coli growing in a glucose-mineral medium of elevated osmotic strength generated with NaCl, had the same capacity to accumulate proline betaine and glycine betaine. Its capacity to accumulate γ-butyrobetaine was, however, 40 to 50% lower. Accordingly, externally added proline betaine and glycine betaine stimulated aerobic growth of osmotically stressed cells equally well, and they were more osmoprotective than γ-butyrobetaine. In cells grown at an osmotic strength of 0.64, 1.01, or 1.47 osmolal, respectively, the molal cytoplasmic concentration of the two former betaines corresponded to 29, 38, or 58% of the external osmotic strength. Nuclear magnetic resonance spectroscopy revealed that trehalose and glutamic acid were the only species of organic osmolytes accumulated in significant amounts in cells grown under osmotic stress in glucosemineral medium without betaines. Their combined molal concentration in the cytoplasm of cells grown at 1.01 osmolal corresponded to 27% of the external osmotic strength.

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Authors and Affiliations

  1. Institute of Mathematical and Physical Science, University of Tromsø, N-9001, Tromsø, Norway

    P. I. Larsen & L. K. Sydnes

  2. Institute of Fisheries, University of Tromsø, N-9001, Tromsø, Norway

    P. I. Larsen, B. Landfald & A. R. Strøm

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  1. P. I. Larsen
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  2. L. K. Sydnes
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  3. B. Landfald
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  4. A. R. Strøm
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Larsen, P.I., Sydnes, L.K., Landfald, B. et al. Osmoregulation in Escherichia coli by accumulation of organic osmolytes: betaines, glutamic acid, and trehalose. Arch. Microbiol. 147, 1–7 (1987). https://doi.org/10.1007/BF00492896

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  • DOI: https://doi.org/10.1007/BF00492896

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