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Related Experiment Videos

Dimeric tRNA precursors in yeast.

O Schmidt, J Mao, R Ogden

    Nature
    |October 23, 1980
    PubMed
    Summary
    This summary is machine-generated.

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    Researchers discovered a novel eukaryotic dimeric transfer RNA (tRNA) precursor in yeast. This precursor, containing both tRNA(Arg)3 and tRNA(Asp) genes, is efficiently processed into mature tRNAs by Xenopus oocyte nuclear extract.

    Area of Science:

    • Molecular Biology
    • Genetics
    • Biochemistry

    Background:

    • Transfer RNA (tRNA) genes are essential for protein synthesis.
    • Gene organization and expression mechanisms in eukaryotes are complex.
    • Previous studies have not identified dimeric tRNA precursors in eukaryotes.

    Purpose of the Study:

    • To investigate the expression and processing of co-transcribed tRNA genes from Saccharomyces cerevisiae.
    • To determine if a dimeric tRNA precursor can be formed and processed in a heterologous system.
    • To report the first observation of a eukaryotic dimeric tRNA precursor.

    Main Methods:

    • Isolation and nucleotide sequencing of two distinct DNA fragments containing tRNA(Arg)3 and tRNA(Asp) genes from yeast.
    • In vitro transcription of these DNA fragments using a Xenopus oocyte nuclear extract.

    Related Experiment Videos

  • Analysis of the transcribed RNA products to identify precursor and mature tRNA species.

    • Main Results:

    • Two DNA fragments from yeast, each with tandem tRNA(Arg)3 and tRNA(Asp) genes, were identified.
    • Transcription in Xenopus nuclear extract produced a single precursor RNA molecule containing both tRNA species.
    • This precursor RNA was efficiently processed into mature-sized tRNA(Arg)3 and tRNA(Asp) molecules.

    Conclusions:

    • A novel eukaryotic dimeric tRNA precursor, transcribed from tandem genes, has been identified.
    • Xenopus oocyte nuclear extract possesses enzymatic activity capable of processing this dimeric tRNA precursor.
    • This finding provides new insights into tRNA gene organization and RNA processing pathways in eukaryotes.