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Phosphate transport in Micrococcus lysodeikticus.

I Friedberg

    Biochimica Et Biophysica Acta
    |May 2, 1977
    PubMed
    Summary
    This summary is machine-generated.

    Micrococcus lysodeikticus actively transports phosphate via an energy-dependent mechanism that is regulated by nutrient availability and sensitive to various inhibitors, revealing key aspects of microbial nutrient uptake.

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    Area of Science:

    • Microbiology
    • Cellular Physiology
    • Biochemistry

    Background:

    • Phosphate is an essential nutrient for microbial growth.
    • Understanding phosphate transport mechanisms is crucial for microbial physiology.

    Purpose of the Study:

    • To investigate the energy-dependent phosphate transport system in Micrococcus lysodeikticus.
    • To characterize the regulation and kinetics of phosphate uptake.

    Main Methods:

    • Studied phosphate accumulation against a concentration gradient.
    • Investigated the effect of nutrient deprivation and inhibitors on transport.
    • Determined kinetic parameters (Km, Ki) and activation energy.

    Main Results:

    • Phosphate transport is energy-dependent and derepressed during phosphate starvation.

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  • Transport is inhibited by chloramphenicol, sulfhydryl reagents, respiratory inhibitors, and uncouplers.
  • Apparent Km is 4.3 µM, with distinct activation energies at different temperatures.
  • K+ and Mg2+ enhance transport rate, while arsenate competitively inhibits it.

    • Conclusions:

    • Micrococcus lysodeikticus possesses a regulated, energy-requiring phosphate transport system.
    • The transport mechanism is sensitive to environmental cues and specific chemical agents.
    • Kinetic and thermodynamic properties provide insights into the transport process.