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Chloroplast DNA codes for transfer RNA

J M McCrea, C L Hershberger

    Nucleic Acids Research
    |August 1, 1976
    PubMed
    Summary
    This summary is machine-generated.

    Euglena gracilis chloroplasts contain distinct transfer RNA (tRNA) species. These organelle tRNAs differ from nuclear tRNAs, with specific fractions identified through hybridization techniques.

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    Area of Science:

    • Molecular Biology
    • Genetics
    • Biochemistry

    Background:

    • Transfer RNAs (tRNAs) are crucial for protein synthesis, translating genetic information from messenger RNA (mRNA) into amino acid sequences.
    • Organelle genomes, such as chloroplast DNA (ct DNA), encode a subset of cellular tRNAs, alongside nuclear DNA.
    • Understanding the origin and diversity of tRNAs in different cellular compartments is vital for comprehending gene expression regulation.

    Purpose of the Study:

    • To investigate the diversity and origin of transfer RNAs (tRNAs) in Euglena gracilis, specifically differentiating between nuclear and chloroplast-encoded tRNAs.
    • To quantitate the number of chloroplast cistrons coding for tRNA by hybridizing isolated tRNAs to ct DNA.
    • To characterize different tRNA fractions based on their hybridization patterns to ct DNA and nuclear DNA.

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    Main Methods:

    • Isolation of transfer RNAs (tRNAs) from Euglena gracilis.
    • Quantitation of chloroplast tRNA cistrons using hybridization of tRNA to chloroplast DNA (ct DNA).
    • Partial purification of specific tRNA species via hybridization-chromatography and chromatography on dihydroxyboryl substituted amino ethyl cellulose.
    • Hybridization assays comparing total cellular tRNA, fractionated tRNA, and isolated chloroplast tRNA with ct DNA and nuclear DNA.

    Main Results:

    • The study identified distinct tRNA populations that hybridize to chloroplast DNA (ct DNA) and nuclear DNA, suggesting different origins.
    • Total cellular tRNA in Euglena gracilis hybridized to ct DNA, indicating approximately 25 cistrons.
    • Fractionation revealed two tRNA populations: Fraction I hybridized to both nuclear and ct DNA (approx. 18 cistrons to ct DNA), while Fraction II hybridized exclusively to ct DNA (approx. 7 cistrons).
    • tRNA isolated from chloroplasts hybridized to both ct DNA and nuclear DNA (approx. 18 cistrons to ct DNA), but Fraction II-type tRNA was not detected in isolated chloroplasts.

    Conclusions:

    • Euglena gracilis possesses distinct tRNA populations originating from both nuclear and chloroplast genomes.
    • A significant portion of cellular tRNA appears to be chloroplast-derived, with specific fractions showing unique hybridization characteristics.
    • The absence of Fraction II-type tRNA in isolated chloroplasts suggests potential complexities in tRNA localization or organelle-specific processing.