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Related Experiment Videos

Ornithine decarboxylase may function as an initiation factor for RNA polymerase I

C Manen, D H Russel

    Science (New York, N.Y.)
    |February 4, 1977
    PubMed
    Summary

    Ornithine decarboxylase, a labile protein, enhances RNA polymerase I activity by increasing initiation rates. This study identifies ornithine decarboxylase as the key modulator of RNA polymerase I, demonstrating its purification via affinity chromatography.

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    Area of Science:

    • Biochemistry
    • Molecular Biology
    • Enzymology

    Background:

    • RNA polymerase I activity is regulated by labile proteins with short half-lives.
    • Ornithine decarboxylase (ODC) is a labile protein whose activity precedes increased RNA polymerase I activity.

    Purpose of the Study:

    • To investigate the role of ornithine decarboxylase (ODC) in modulating RNA polymerase I activity.
    • To demonstrate a novel purification method for ODC using RNA polymerase I affinity chromatography.
    • To provide evidence supporting the hypothesis that ODC is the labile protein regulating RNA polymerase I.

    Main Methods:

    • RNA polymerase I activity assays.
    • Purification of ornithine decarboxylase (ODC) via RNA polymerase I affinity chromatography.
    • Analysis of RNA synthesis using radiolabeled adenosine triphosphate incorporation.

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    Main Results:

    • Ornithine decarboxylase (ODC) addition increased the initial rate and linearity of RNA polymerase I assays.
    • ODC enhanced the rate of RNA chain initiation.
    • A novel method for ODC purification using RNA polymerase I affinity chromatography was established.

    Conclusions:

    • Ornithine decarboxylase (ODC) directly modulates RNA polymerase I activity.
    • ODC is identified as the labile protein responsible for regulating RNA polymerase I.
    • RNA polymerase I affinity chromatography is an effective method for ODC purification.