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Related Experiment Videos

Precursor-specific nucleotide sequences can govern RNA folding.

D A Stahl, T A Walker, B Meyhack

    Cell
    |December 1, 1979
    PubMed
    Summary
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    The 5' end of Bacillus subtilis 5S ribosomal RNA precursor guides its own folding. Specific nucleotides prevent aberrant conformations, ensuring proper RNA structure and function during transcription termination.

    Area of Science:

    • Molecular Biology
    • RNA Biochemistry
    • Microbial Genetics

    Background:

    • Ribosomal RNA (rRNA) synthesis involves precursor molecules with specific sequences.
    • The 5S rRNA precursor in Bacillus subtilis contains distinct 5' and 3' terminal segments.
    • Understanding precursor processing is crucial for elucidating RNA biogenesis and function.

    Purpose of the Study:

    • To investigate the role of precursor-specific segments in 5S rRNA maturation and folding.
    • To determine the function of the 5' and 3' terminal elements of the 5S rRNA precursor.
    • To elucidate the mechanism by which the 5' precursor sequence influences the conformation of mature 5S rRNA.

    Main Methods:

    • Nucleotide sequence analysis and secondary structure prediction.

    Related Experiment Videos

  • Chemical synthesis of truncated 5S rRNA precursor molecules.
  • Polyacrylamide gel electrophoresis to assess RNA conformation.
  • Nuclease digestion assays to map conformational changes.

    • Main Results:

    • The 3' precursor segment is implicated in transcription termination.
    • The 5' precursor segment facilitates the native folding of the mature 5S rRNA domain.
    • Deletion of the 5' terminal nucleotides results in an aberrant conformation.
    • Removal of residual 5' precursor sequences by RNAase M5 restores the native conformation.

    Conclusions:

    • The 5' terminal nucleotides of the 5S rRNA precursor play a critical role in directing the correct folding of the mature rRNA domain.
    • Base-pairing interactions involving the 5' terminal six nucleotides prevent the formation of abnormal conformations.
    • Precursor-specific sequences and conformational dynamics are integral to RNA function and maturation.