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Related Experiment Videos

Cellulase location in Cellvibrio fulvus.

B Berg

    Canadian Journal of Microbiology
    |January 1, 1975
    PubMed
    Summary

    Cellulase location in C. fulvus varies with carbon source and culture age. Enzyme is cell-bound on glucose/cellobiose, but cell-free when grown on cellulose.

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    Area of Science:

    • Microbiology
    • Enzymology
    • Biochemistry

    Background:

    • Cellulase is a key enzyme in breaking down cellulose.
    • Understanding cellulase localization is crucial for optimizing its industrial applications.
    • The fungus C. fulvus produces cellulase, but its precise location and regulation are not fully understood.

    Purpose of the Study:

    • To investigate the influence of carbon source and culture age on cellulase location in C. fulvus.
    • To determine the specific cellular compartments where cellulase activity resides.
    • To elucidate the regulatory mechanisms governing cellulase production.

    Main Methods:

    • Culturing C. fulvus on various carbon sources (glucose, cellobiose, cellulose, amylose).
    • Enzyme activity assays using carboxymethyl cellulose (CMC) as substrate.
    • Cell fractionation techniques involving EDTA, lysozyme, and detergent treatments.
    • Analysis of enzyme repression and differential growth rates.

    Main Results:

    • Cellulase was cell-bound when C. fulvus was grown on glucose or cellobiose, with activity found on the cell surface, periplasm, and membrane fraction.
    • Growth on cellulose yielded cell-free cellulase activity.
    • Glucose repressed cellulase production, while cellobiose and amylose supported lower, constant production rates compared to cellulose.

    Conclusions:

    • Cellulase localization in C. fulvus is dynamic and significantly influenced by the growth substrate.
    • The carbon source dictates whether cellulase is cell-bound or secreted, impacting its accessibility.
    • Differential gene expression and enzyme regulation play a role in cellulase production based on nutrient availability.

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