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Structlre of transfer RNA molecules containing the long variable loop

T Brennan, M Sundaralingam

    Nucleic Acids Research
    |November 1, 1976
    PubMed
    Summary
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    Type II transfer RNAs (tRNAs) share tertiary base pairing with Type I tRNAs but lack base triples. Their long variable loop structure suggests tertiary base pairs alone may stabilize tRNA folding.

    Area of Science:

    • Molecular Biology
    • Structural Biology
    • Biochemistry

    Background:

    • Transfer RNA (tRNA) molecules are crucial for protein synthesis, exhibiting diverse structural features.
    • Two main types of tRNAs, Type I and Type II, are distinguished by their variable loop size and structural characteristics.
    • Understanding tRNA structure is key to elucidating their function in translation.

    Purpose of the Study:

    • To propose a structural model for Type II tRNAs with a long variable loop.
    • To compare tertiary base interactions in Type II tRNAs with those in Type I tRNAs.
    • To investigate the functional significance of the variable loop and tertiary base triples in tRNA structure.

    Main Methods:

    • Structural analysis and comparison of Type I and Type II tRNA molecules.

    Related Experiment Videos

  • Identification and characterization of tertiary base pairing and base triples.
  • Analysis of the structural features of the long variable loop in Type II tRNAs.

    • Main Results:

    • Type II tRNAs possess a long variable loop emerging from the dihydrouridine helix.
    • Tertiary base pairing interactions in Type II tRNAs are similar to Type I tRNAs, but base triples are generally absent.
    • The long variable loop is tilted relative to other helical structures in the tRNA.

    Conclusions:

    • Tertiary base pairs alone may be sufficient to maintain the functional fold of tRNAs.
    • Base triples and the variable loop appear to have limited functional significance for tRNA folding.
    • Base type at position 9 correlates with base triples and G-C pairs in the dihydrouridine stem.