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Glutamate uptake in Thiobacillus novellus

D J Hoban, R M Lyric

    Canadian Journal of Microbiology
    |March 1, 1977
    PubMed
    Summary

    Thiobacillus novellus exhibits a two-component glutamate uptake system, sensitive to temperature and inhibitors. Glutamate is rapidly incorporated into a peptide within the cells.

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    Area of Science:

    • Microbiology
    • Biochemistry
    • Molecular Biology

    Background:

    • Thiobacillus novellus is a bacterium known for its role in sulfur oxidation.
    • Understanding nutrient uptake systems is crucial for comprehending microbial physiology and metabolism.

    Purpose of the Study:

    • To investigate the kinetic properties of the glutamate uptake system in Thiobacillus novellus.
    • To identify the components and regulatory mechanisms of glutamate transport.

    Main Methods:

    • Utilized intact cells of Thiobacillus novellus for uptake experiments.
    • Applied kinetic analysis to characterize the glutamate uptake system.
    • Tested the effects of various metabolic inhibitors on glutamate accumulation.

    Main Results:

    • Identified two distinct glutamate uptake components: high-affinity (HA) with Km 33 µM and low-affinity (LA) with Km 18 mM.
    • Glutamate uptake was temperature-sensitive and inhibited by cyanide, DNP, iodoacetate, mercuric chloride, sodium azide, CCCP, and DCCD.
    • Observed rapid incorporation of glutamate into a soluble peptide within the cells, potentially explaining complex uptake kinetics.

    Conclusions:

    • Thiobacillus novellus possesses a complex, energy-dependent glutamate uptake system with distinct kinetic properties.
    • The rapid intracellular conversion of glutamate to a peptide suggests a unique metabolic strategy for nutrient assimilation.

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