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Literature DB >> 9733699

The Na+-responsive ntp operon is indispensable for homeostatis of K+ and Na+ in Enterococcus hirae at limited proton potential.

Abstract

Enterococcus hirae ATCC 9790 grew well in Na+-deficient, low-K+ medium, but growth was inhibited by carbonylcyanide m-chlorophenylhydrazone (CCCP). Growth inhibition and decrease of cellular K+ levels in the presence of CCCP were relieved by the addition of Na+ and a high concentration of K+. In contrast, in the mutant defective in Na+-ATPase or the NtpJ component of the KtrII K+ uptake system, CCCP-induced growth inhibition was rescued by a high concentration of K+ but not of Na+. These transporters are thus indispensable for homeostatis of K+ and Na+ at low proton potential.

Entities: Chemical Species

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Year: 1998 PMID： 9733699 PMCID： PMC107521

Source DB: PubMed Journal: J Bacteriol ISSN： 0021-9193 Impact factor: 3.490

19 in total

Review 1. The role of transport processes in survival of lactic acid bacteria. Energy transduction and multidrug resistance.

Authors: W N Konings; J S Lolkema; H Bolhuis; H W van Veen; B Poolman; A J Driessen
Journal: Antonie Van Leeuwenhoek Date: 1997-02 Impact factor: 2.271

The Na+-responsive ntp operon is indispensable for homeostatis of K+ and Na+ in Enterococcus hirae at limited proton potential.

Review 1. The role of transport processes in survival of lactic acid bacteria. Energy transduction and multidrug resistance.

2. Sodium/proton antiporter in Streptococcus faecalis.

Review 3. Ion currents and physiological functions in microorganisms.

4. Increased membrane ATPase and K + transport rates in Streptococcus faecalis induced by K + restriction during growth.

5. Streptococcus faecalis mutants defective in regulation of cytoplasmic pH.

6. Circulation of H+ and K+ across the plasma membrane is not obligatory for bacterial growth.

7. Energy coupling to potassium transport in Streptococcus faecalis. Interplay of ATP and the protonmotive force.

Review 8. The role of Na+ in transport processes of bacterial membranes.

9. ATP-driven exchange of Na+ and K+ ions by Streptococcus faecalis.

10. Second system for potassium transport in Streptococcus faecalis.

1. Function of a principal Na(+)/H(+) antiporter, ShaA, is required for initiation of sporulation in Bacillus subtilis.

2. Evidence for Na(+) influx via the NtpJ protein of the KtrII K(+) uptake system in Enterococcus hirae.