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Second system for potassium transport in Streptococcus faecalis.

H Kobayashi

    Journal of Bacteriology
    |May 1, 1982
    PubMed
    Summary

    Streptococcus faecalis possesses a second potassium (K+) transport system. This ATP-driven system is distinct from the previously known proton motive force-dependent system and is regulated by intracellular K+ levels.

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    Area of Science:

    • Microbiology
    • Cell Biology
    • Biochemistry

    Background:

    • Potassium (K+) accumulation in Streptococcus faecalis was previously understood to be mediated by a single transport system.
    • This known system relies on both Adenosine Triphosphate (ATP) and the proton motive force for K+ transport.

    Purpose of the Study:

    • To investigate the existence and characteristics of additional potassium transport mechanisms in Streptococcus faecalis.
    • To differentiate the properties of a newly identified K+ transport system from the established one.

    Main Methods:

    • Characterization of K+ transport in Streptococcus faecalis under varying conditions.
    • Analysis of transport system dependency on ATP and proton motive force.
    • Investigation of system regulation by intracellular K+ concentration and pH optima.

    Main Results:

    • A second K+ transport system in S. faecalis was identified.
    • This system is ATP-dependent and does not require proton motive force.
    • The system is inducible by low intracellular K+ concentrations, exhibits a pH optimum around 8.5, and shows minimal Rubidium+ (Rb+) accumulation.

    Conclusions:

    • Streptococcus faecalis harbors at least two distinct potassium transport systems.
    • The newly discovered system exhibits unique regulatory and operational characteristics compared to the previously described system.

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