Efflux of compatible solutes in Corynebacterium glutamicum mediated by osmoregulated channel activity

Ruffert S, Lambert C, Peter H, Wendisch VF, Kramer R (1997)
European Journal of Biochemistry 247(2): 572-580.

Zeitschriftenaufsatz | Veröffentlicht| Englisch
 
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Autor*in
Ruffert, S.; Lambert, C.; Peter, H.; Wendisch, Volker F.UniBi ; Kramer, R.
Abstract / Bemerkung
Bacteria respond to hypoosmotic stress by releasing low-molecular-mass solutes in older to maintain constant turgor pressure. We have studied the function of osmoregulated channel(s) in Corynebactium glutamicum which are responsible for efflux of various solutes upon sudden decrease in osmotic pressure. The channels preferentially mediated efflux of compatible solutes such as glycine betaine and proline. The release of molecules of similar size. e.g. glutamate or lysine, was restricted, ATP was completely retained even after severe osmotic shock. The cells maintained high cytoplasmic K+ and Na+ concentrations under hypoosmotic shock. Several results suggest that the solute efflux is mediated by a channel and not by a carrier. e.g. by reversal of the glycine betaine uptake systems of C. glutamicum,lf the release of glycine betaine and proline was extremely fast reaching an efflux rate of 6000 mu mol . min(-1). g dm(-1) or higher: the efflux was not significantly influenced by addition of external transport substrate, e.g. glycine betaine; in spite of an extremely high chemical gradient, no significant efflux under isoosmolar conditions was observed: efflux of solutes was unchanged after full uncoupling of membrane energetics by carbonylcyanide m-chlorophenylhydrazone (CCCP). These results indicate the presence of an osmoregulated channel in C. glutamicum similar to the mechanosensitive channel(s) of Escherichia coli. The activity of the channel did not depend on the growth conditions, but we observed a light regulation on the level of activity, i.e. the mechanosensitive channel behaved as a perfect osmometer. By monitoring release of glycine betaine under slow and continuous decrease of the external osmolality, we observed continous efflux without a stepwise release of solutes. This resulted in a significant steady-state decrease ase of the membrane potential.
Stichworte
activated channels; brevibacterium-linens; glycine betaine; functional reconstitution; escherichia-coli; compatible solutes; mechanosensitive channel; efflux; osmoregulation; osmotic shock; corynebacterium glutamicum; lysine uptake; glutamate; accumulation; ion channels
Erscheinungsjahr
1997
Zeitschriftentitel
European Journal of Biochemistry
Band
247
Ausgabe
2
Seite(n)
572-580
ISSN
0014-2956
Page URI
https://pub.uni-bielefeld.de/record/1895261

Zitieren

Ruffert S, Lambert C, Peter H, Wendisch VF, Kramer R. Efflux of compatible solutes in Corynebacterium glutamicum mediated by osmoregulated channel activity. European Journal of Biochemistry. 1997;247(2):572-580.
Ruffert, S., Lambert, C., Peter, H., Wendisch, V. F., & Kramer, R. (1997). Efflux of compatible solutes in Corynebacterium glutamicum mediated by osmoregulated channel activity. European Journal of Biochemistry, 247(2), 572-580.
Ruffert, S., Lambert, C., Peter, H., Wendisch, V. F., and Kramer, R. (1997). Efflux of compatible solutes in Corynebacterium glutamicum mediated by osmoregulated channel activity. European Journal of Biochemistry 247, 572-580.
Ruffert, S., et al., 1997. Efflux of compatible solutes in Corynebacterium glutamicum mediated by osmoregulated channel activity. European Journal of Biochemistry, 247(2), p 572-580.
S. Ruffert, et al., “Efflux of compatible solutes in Corynebacterium glutamicum mediated by osmoregulated channel activity”, European Journal of Biochemistry, vol. 247, 1997, pp. 572-580.
Ruffert, S., Lambert, C., Peter, H., Wendisch, V.F., Kramer, R.: Efflux of compatible solutes in Corynebacterium glutamicum mediated by osmoregulated channel activity. European Journal of Biochemistry. 247, 572-580 (1997).
Ruffert, S., Lambert, C., Peter, H., Wendisch, Volker F., and Kramer, R. “Efflux of compatible solutes in Corynebacterium glutamicum mediated by osmoregulated channel activity”. European Journal of Biochemistry 247.2 (1997): 572-580.

30 Zitationen in Europe PMC

Daten bereitgestellt von Europe PubMed Central.

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