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Related Experiment Videos

Assaying proteinases with azocoll.

R Chavira, T J Burnett, J H Hageman

    Analytical Biochemistry
    |February 1, 1984
    PubMed
    Summary

    To achieve reliable protease assays using azocoll (a collagen substrate), vigorous prewashing of the substrate and agitation during the assay are essential. These steps ensure linear hydrolysis rates over time, improving assay standardization.

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    Area of Science:

    • Biochemistry
    • Enzymology

    Background:

    • Azocoll is a widely used substrate for assaying proteolytic enzymes.
    • Previous studies noted non-linear hydrolysis rates over time, lacking explanation.

    Purpose of the Study:

    • To identify factors affecting azocoll hydrolysis and standardize protease assays.
    • To investigate the cause of non-linear time-dependent hydrolysis rates.

    Main Methods:

    • Assessing hydrolysis rates of azocoll with Bacillus subtilis extracts and subtilisin BPN'.
    • Investigating the effect of azocoll prewashing and buffer filtrate on hydrolysis.
    • Examining the impact of agitation speed on hydrolysis rates.
    • Determining the absorption maximum of solubilized azocoll.

    Main Results:

    • Protease concentration-dependent hydrolysis remained linear.
    • Time-dependent hydrolysis showed non-linear increases.
    • Prewashing azocoll with buffer yielded linear time-course assays.
    • Filtrate from prewashing could restore non-linear time courses.
    • Agitation speed significantly affected hydrolysis rates (factor of 3 variation).
    • Solubilized azocoll has an absorption maximum at 516 nm (pH 7.8).

    Conclusions:

    • Prewashing azocoll substrate is critical for reproducible, linear time-course assays.
    • Agitation during the assay is necessary for consistent results.
    • These optimized methods improve the standardization of proteolytic enzyme assays.

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