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Related Experiment Videos

Disulfide reduction and sulfhydryl uptake by Streptococcus mutans.

E L Thomas

    Journal of Bacteriology
    |January 1, 1984
    PubMed
    Summary

    Streptococcus mutans reduces disulfide compounds, creating a reducing environment inside cells and in the surrounding medium. This involves specific reductase and transport systems for sulfhydryl compounds.

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    Area of Science:

    • Microbiology
    • Biochemistry

    Background:

    • Streptococcus mutans is a key bacterium in dental caries.
    • Understanding its metabolic pathways is crucial for developing targeted interventions.

    Purpose of the Study:

    • To investigate the mechanisms by which Streptococcus mutans reduces disulfide compounds.
    • To identify the cellular systems involved in managing sulfhydryl compounds.

    Main Methods:

    • Incubation of Streptococcus mutans with various disulfide compounds.
    • Measurement of sulfhydryl compound accumulation intracellularly and extracellularly.
    • Analysis of reductase activities in different cellular fractions (particulate and soluble).
    • Characterization of transport systems for disulfide and sulfhydryl compounds.

    Main Results:

    • Disulfide compounds like oxidized lipoic acid, lipoamide, cystamine, glutathione disulfide (GSSG), and L-cystine were reduced by S. mutans.
    • Reduction rates and affinities varied among compounds, influencing sulfhydryl localization (intracellular vs. extracellular).
    • Distinct reductase activities (NADH-dependent and NADPH-dependent) were localized in particulate and soluble fractions, respectively.
    • Two transport systems were identified, one for GSSG, L-cystine, and reduced glutathione, and another for L-cysteine and related compounds.
    • Uptake and reduction led to a significant increase in intracellular sulfhydryl content (up to 30-40 mM).

    Conclusions:

    • S. mutans possesses sophisticated reductase and transport systems for disulfide and sulfhydryl compounds.
    • These systems allow the bacterium to actively regulate redox balance, creating a reducing environment.
    • This capability may play a role in S. mutans' survival and virulence in the oral environment.

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