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Monoribosomal attachment to messenger ribonucleic acid in sodium fluoride-treated rabbit reticulocytes

M Geraghty, M Galler, F Schiffman

    The Biochemical Journal
    |June 1, 1973
    PubMed

    Insights

    Mild proteolysis using Pronase separates unbound ribosomes into subunits, while mRNA-bound ribosomes stay intact. Sodium fluoride (NaF) treatment of reticulocyte monoribosomes enhances this mRNA-ribosome attachment, aiding mRNA recovery.

    Area of Science:

    • Molecular Biology
    • Biochemistry
    • Cellular Biology

    Background:

    • Ribosomes are essential for protein synthesis, translating messenger RNA (mRNA) into proteins.
    • Understanding ribosome-mRNA interactions is crucial for regulating gene expression.
    • Proteolytic enzymes can be used to probe molecular complexes.

    Purpose of the Study:

    • To investigate the effect of mild proteolysis on ribosome-mRNA complexes.
    • To determine if ribosomes attached to mRNA resist dissociation.
    • To explore the role of sodium fluoride (NaF) in stabilizing ribosome-mRNA interactions.

    Main Methods:

    • Incubation of reticulocyte lysates with Pronase, a protease.
    • Treatment of reticulocytes with sodium fluoride (NaF).
    • Analysis of ribosome dissociation and mRNA recovery.

    Main Results:

    • Pronase selectively dissociates non-mRNA-bound ribosomes into subunits.
    • mRNA-bound ribosomes remain intact after Pronase treatment.
    • A fraction of monoribosomes from NaF-treated reticulocytes resisted proteolytic dissociation.

    Conclusions:

    • Mild proteolysis can distinguish between free and mRNA-bound ribosomes.
    • Sodium fluoride enhances the stability of ribosome-mRNA attachment.
    • This stabilization mechanism offers a method for recovering mRNA from monoribosomes.

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