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The evolution of 5S RNA secondary structures.

D Sankofff, A M Morin, R J Cederhren

    Canadian Journal of Biochemistry
    |June 1, 1978
    PubMed
    Summary

    Researchers used free energy calculations to find a common 5S ribosomal RNA (rRNA) structure. A

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    Area of Science:

    • Molecular Biology
    • Bioinformatics
    • Evolutionary Biology

    Background:

    • 5S ribosomal RNA (rRNA) is a crucial component of ribosomes in both prokaryotic and eukaryotic organisms.
    • Understanding the conserved secondary structure of 5S rRNA provides insights into its functional stability and evolutionary history.

    Purpose of the Study:

    • To identify a common base-pair structure for 5S ribosomal RNA (rRNA) across diverse species.
    • To compare computational models of 5S rRNA structure and assess their evolutionary conservation.

    Main Methods:

    • Application of the Pipas-McMahon algorithm utilizing free energy calculations.
    • Analysis of 5S rRNA sequences from both eukaryotic and prokaryotic sources.
    • Comparative analysis of predicted secondary structures with recently proposed models.

    Main Results:

    • A 'Y'-shaped model consistently emerged as having the lowest free energy among predicted 5S rRNA structures.
    • The identified 'Y'-shaped model showed remarkable similarity to recently proposed models.
    • Minor discrepancies between models were attributable to variations in computational techniques.

    Conclusions:

    • Prokaryotic and eukaryotic 5S rRNA share a highly conserved secondary structure.
    • The stability of this conserved structure suggests strong evolutionary pressure against change.
    • The Pipas-McMahon algorithm effectively predicts conserved RNA structures.

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