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Related Experiment Videos

Actinomycin D binds with highest affinity to nonribosomal DNA.

M M Khan, T J Lindell

    The Journal of Biological Chemistry
    |April 25, 1980
    PubMed
    Summary

    Low-concentration actinomycin D (0.004 microgram/ml) was tested for selective binding to eukaryotic ribosomal RNA (rRNA) genes. The study found that actinomycin D did not selectively bind to rDNA, suggesting it may not play a direct role in rRNA transcription regulation.

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    Area of Science:

    • Molecular Biology
    • Genetics
    • Biochemistry

    Background:

    • Previous studies suggested a role for actinomycin D in regulating eukaryotic ribosomal RNA (rRNA) transcription.
    • Actinomycin D is known to bind to DNA.

    Purpose of the Study:

    • To investigate the selective binding of low-concentration actinomycin D to DNA involved in rRNA transcription.
    • To determine if actinomycin D specifically binds to ribosomal DNA (rDNA) sequences.

    Main Methods:

    • Digestion of rat liver DNA and nucleolar DNA with EcoRI restriction enzyme.
    • Incubation with low-concentration [3H]actinomycin D (0.004 microgram/ml).
    • Resolution of DNA fragments using RPC-5 chromatography and hybridization with [32P]rRNA.

    Main Results:

    • Actinomycin D exhibited highest affinity binding to a specific DNA fraction, eluting at 0.63 M KCl.
    • Nucleolar DNA, enriched in rDNA, did not show similar high-affinity binding of actinomycin D.
    • The high-affinity binding DNA fraction was confirmed to be non-rDNA via rRNA hybridization.

    Conclusions:

    • At 0.004 microgram/ml, actinomycin D does not selectively bind to rDNA in rat liver cells.
    • The functional significance of the high-affinity actinomycin D-binding DNA in rRNA transcription regulation requires further investigation.

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