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Related Experiment Videos

Autolysis of Streptococcus cremoris

J J Sullivan, G R Jago, L Mou

    The Journal of Dairy Research
    |June 1, 1976
    PubMed
    Summary

    The autolysin from Streptococcus cremoris acts as an endo-N-acetylmuramidase, breaking down cell walls. This bacterial enzyme showed peak activity during rapid growth, fragmenting the coccal wall.

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    Area of Science:

    • Microbiology
    • Enzymology
    • Bacterial Cell Wall Biology

    Background:

    • Streptococcus cremoris is a key lactic acid bacterium.
    • Bacterial autolysins play crucial roles in cell wall metabolism and turnover.
    • Understanding autolysin function is vital for controlling bacterial growth and cell lysis.

    Purpose of the Study:

    • To characterize the enzymatic specificity and activity of the autolysin from Streptococcus cremoris.
    • To investigate the role of this autolysin in bacterial cell wall degradation.

    Main Methods:

    • Enzyme assays to determine hydrolytic activity (amidase, endopeptidase, N-acetylmuramidase).
    • Growth curve analysis to correlate enzyme activity with bacterial growth phase.
    • Electron microscopy to visualize the effect of the enzyme on the bacterial cell wall.

    Main Results:

    • The autolysin specifically hydrolyzed the glycosidic bond between N-acetylmuramic acid and N-acetylglucosamine.
    • The enzyme exhibited no amidase or endopeptidase activity.
    • Optimal enzyme activity was observed during the exponential growth phase.
    • Electron microscopy indicated cell wall fragmentation at the equatorial ring.

    Conclusions:

    • The Streptococcus cremoris autolysin functions as an endo-N-acetylmuramidase, targeting a specific linkage in the peptidoglycan layer.
    • Its activity is linked to bacterial growth, suggesting a role in cell division or wall remodeling.
    • The enzyme appears to mediate cell wall fragmentation, potentially leading to lysis.

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