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Related Experiment Videos

Structure-function relationship of Rous sarcoma virus leader RNA.

J L Darlix, M Zuker, P F Spahr

    Nucleic Acids Research
    |September 11, 1982
    PubMed
    Summary

    This study reveals the RNA sequence and proposed structure of Rous Sarcoma virus (RSV) leader RNA. The findings suggest a mechanism for efficient viral protein synthesis by bringing key elements together.

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    Area of Science:

    • Molecular Biology
    • Virology
    • RNA Structure

    Background:

    • Rous Sarcoma virus (RSV) produces multiple viral RNAs, including subgenomic RNAs for Env and Src genes.
    • The 5' leader RNA of RSV contains a conserved sequence with a strong ribosome binding site.
    • Previous work identified a strong ribosome binding site within the RSV leader RNA.

    Purpose of the Study:

    • To determine the complete RNA sequence of the Rous Sarcoma virus (RSV) leader RNA.
    • To propose a secondary structure for the 5' untranslated region of RSV leader RNA.
    • To investigate the interaction between the leader RNA, ribosome binding site, and translation initiation.

    Main Methods:

    • RNA sequencing to determine the leader RNA sequence.
    • Computational modeling to predict RNA secondary structure.
    • In vitro ribosome protection assays to map ribosome binding sites.

    Main Results:

    • The complete RNA sequence of the RSV leader RNA was determined.
    • A proposed secondary structure positions the Cap, Gag initiation codon, and ribosome binding site in close proximity.
    • Ribosome protection assays identified a protected region upstream of the Gag AUG codon, suggesting interaction with the leader RNA.

    Conclusions:

    • The proposed folding of the RSV leader RNA facilitates efficient translation initiation.
    • The findings provide insights into the mechanism of viral gene expression regulation in RSV.
    • The study elucidates the role of the leader RNA sequence and structure in ribosome binding and translation.

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