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Consensus structure and evolution of 5S rRNA.

H Küntzel, B Piechulla, U Hahn

    Nucleic Acids Research
    |February 11, 1983
    PubMed
    Summary
    This summary is machine-generated.

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    A consensus model of 5S ribosomal RNA (rRNA) structure reveals conserved nucleotides across diverse organisms. Phylogenetic analysis links nucleotide deletions in specific helices to evolutionary divergence, separating eubacterial/organellar from archaebacterial/eukaryotic lineages.

    Area of Science:

    • Molecular Biology
    • Evolutionary Biology
    • Bioinformatics

    Background:

    • 5S ribosomal RNA (rRNA) is a crucial component of ribosomes in all domains of life.
    • Understanding 5S rRNA structure and evolution provides insights into fundamental cellular processes.
    • Previous models lacked a comprehensive consensus structure across diverse phylogenetic groups.

    Purpose of the Study:

    • To deduce a consensus structure model for 5S rRNA incorporating all conserved nucleotides.
    • To investigate evolutionary relationships and patterns of variation within 5S rRNA.
    • To correlate structural features with phylogenetic divergence across eubacterial, archaebacterial, and eukaryotic domains.

    Main Methods:

    • Comparative analysis of primary and secondary structures from 71 diverse 5S rRNA molecules.

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  • Construction of a consensus structure model highlighting conserved nucleotide positions.
  • Phylogenetic analysis using nucleotide substitution data and dendrogram construction.
  • Identification of group-specific nucleotide deletions in helices III, IV, and V.

    • Main Results:

    • A consensus 5S rRNA structure model was established, defining conserved nucleotide positions.
    • Phylogenetically related groups exhibit characteristic nucleotide deletions in helices III, IV, and V.
    • Potential base pair interactions were identified in helix IV.
    • Dendrogram analysis revealed a primary evolutionary division separating eubacterial/organellar from archaebacterial/eukaryotic/cytosolic lineages.
    • The earliest diverging branch within the eubacterial/organellar group includes specific thermophilic and photosynthetic bacteria, and wheat mitochondria.

    Conclusions:

    • The deduced consensus 5S rRNA structure model accurately represents conserved elements across life.
    • Nucleotide deletions in specific helices serve as reliable phylogenetic markers.
    • The study clarifies the early evolutionary divergence of major life domains based on 5S rRNA structure and sequence.