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Related Experiment Videos

Allosteric mechanism for codon-dependent tRNA selection on ribosomes.

C G Kurland, R Rigler, M Ehrenberg

    Proceedings of the National Academy of Sciences of the United States of America
    |November 1, 1975
    PubMed
    Summary

    The ribosome traps transfer RNA (tRNA) in specific conformations, ensuring accurate protein synthesis by enhancing codon-anticodon matching. This mechanism explains how the cell achieves high fidelity during translation.

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    Area of Science:

    • Molecular Biology
    • Biochemistry
    • Genetics

    Background:

    • Protein synthesis relies on accurate transfer RNA (tRNA) selection.
    • Previous studies suggested weak codon-anticodon interactions alone determine tRNA specificity.
    • The role of the ribosome in modulating tRNA conformation was not fully understood.

    Purpose of the Study:

    • To propose a model where codon-tRNA interactions induce conformational changes in tRNA.
    • To elucidate the ribosome's role in stabilizing specific tRNA conformations for accurate codon recognition.
    • To explain the high specificity observed in tRNA selection during translation.

    Main Methods:

    • Theoretical modeling of codon-tRNA interactions.
    • Analysis of existing experimental data on tRNA-codon binding.

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  • Hypothesizing the allosteric role of codons on tRNA conformation.

    • Main Results:

    • Codon-induced conformational changes in tRNA are proposed.
    • The ribosome preferentially binds tRNAs in conformations favoring cognate codon-anticodon pairing.
    • The ribosome acts as a conformational trap, amplifying binding specificity.

    Conclusions:

    • The ribosome's interaction with tRNA is crucial for translational fidelity.
    • Codons act as allosteric effectors, modulating tRNA conformation.
    • The proposed model reconciles weak in vitro affinities with high in vivo specificity.