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Related Experiment Videos

Two conserved sequence blocks within eukaryotic tRNA genes are major promoter elements

G Galli, H Hofstetter, M L Birnstiel

    Nature
    |December 17, 1981
    PubMed
    Summary

    Split promoter sequences in Xenopus laevis tRNA genes are crucial for transcription. These conserved elements function interchangeably between different transfer RNA (tRNA) genes and even across species, highlighting their fundamental role in gene expression.

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    Area of Science:

    • Molecular Biology
    • Genetics
    • Biochemistry

    Background:

    • Transfer RNA (tRNA) genes contain essential regulatory elements for transcription.
    • Eukaryotic tRNA genes possess conserved sequence blocks critical for their function.
    • Understanding tRNA gene promoters is key to deciphering gene expression regulation.

    Purpose of the Study:

    • To map the split promoter sequences of a specific tRNA gene (tRNALeuCUG) in Xenopus laevis.
    • To investigate the functional conservation and exchangeability of these promoter elements.
    • To determine if prokaryotic sequences homologous to these blocks can function in a eukaryotic system.

    Main Methods:

    • Site-directed mutagenesis to map promoter regions.
    • Construction of chimeric tRNA genes (tRNAMet--tRNALeu) to test sequence exchangeability.

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  • In vitro transcription assays using eukaryotic systems to assess functional activity.

    • Main Results:

    • Split promoter sequences for the Xenopus laevis tRNALeuCUG gene were identified at specific nucleotide positions.
    • These mapped sequences correspond to conserved blocks found in eukaryotic tRNA genes.
    • Chimeric tRNA genes demonstrated transcriptional activity, indicating promoter element exchangeability.
    • Homologous prokaryotic tRNA sequences were transcribed in a eukaryotic system, suggesting conserved functional mechanisms.

    Conclusions:

    • The identified split promoter sequences are essential for tRNALeuCUG gene transcription in Xenopus laevis.
    • Conserved sequence blocks within tRNA promoters exhibit functional interchangeability across different tRNA genes.
    • Prokaryotic tRNA promoter elements can be recognized and utilized by eukaryotic transcription machinery.