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Related Experiment Videos

A specific endpoint assay for ubiquitin.

I A Rose, J V Warms

    Proceedings of the National Academy of Sciences of the United States of America
    |March 1, 1987
    PubMed
    Summary
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    Biochemistry·1993

    New assays quantify free ubiquitin (Ub) and its activating enzyme. This method uses [3H]ATP and measures acid-insoluble radioactivity for accurate Ub detection, aiding biochemical research.

    Area of Science:

    • Biochemistry
    • Enzymology
    • Molecular Biology

    Background:

    • Ubiquitin (Ub) conjugation is a critical post-translational modification regulating numerous cellular processes.
    • Accurate quantification of free ubiquitin and its activating enzymes is essential for understanding Ub-related pathways.

    Purpose of the Study:

    • To develop simple, reliable endpoint assays for quantifying free ubiquitin and ubiquitin-activating enzyme.
    • To characterize a novel preparation of ubiquitin-activating enzyme from human erythrocytes.

    Main Methods:

    • A method utilizing [3H]ATP and iodoacetamide-treated ubiquitin-activating enzyme (E) to measure free ubiquitin via acid-insoluble radioactivity.
    • Enzyme-catalyzed reaction: [3H]ATP + Ub + E → E × [3H]AMP-Ub + PPi, followed by pyrophosphatase activity.

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  • Preparation of ubiquitin-activating enzyme from human erythrocytes without affinity chromatography.

    • Main Results:

    • A straightforward assay for free ubiquitin based on radioactive labeling and acid precipitation was established.
    • The assay ensures near-endpoint conditions by using excess ubiquitin-activating enzyme.
    • A non-affinity chromatography-based preparation of the enzyme from human erythrocytes was successfully developed.

    Conclusions:

    • The developed assays provide simple and effective tools for measuring free ubiquitin and its activating enzyme.
    • The novel enzyme preparation offers an alternative source for biochemical studies.
    • These assays have broad applications in studying ubiquitin-dependent cellular mechanisms.