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Phosphorothioate substrates for T4 RNA ligase

F R Bryant, S J Benkovic

    Biochemistry
    |November 9, 1982
    PubMed
    Summary
    This summary is machine-generated.

    T4 RNA ligase uses phosphorothioate analogues to reveal its reaction mechanism. The enzyme maintains specific phosphorus chirality during adenosine triphosphate (ATP)-dependent and independent RNA ligation steps.

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    Area of Science:

    • Biochemistry
    • Molecular Biology
    • Enzymology

    Background:

    • T4 RNA ligase is crucial for joining RNA fragments.
    • Understanding its reaction mechanism is key to RNA manipulation.
    • Phosphorothioate analogues offer insights into stereochemical details.

    Purpose of the Study:

    • To elucidate the stereochemical aspects of the T4 RNA ligase mechanism.
    • To investigate the roles of adenosine triphosphate (ATP)-dependent and independent reactions.
    • To analyze the reactivity of phosphorothioate analogues as substrates.

    Main Methods:

    • Utilized phosphorothioate analogues of RNA substrates.
    • Examined reactions in both ATP-dependent and ATP-independent conditions.
    • Determined the stereochemical configuration of intermediates and products using chiral analysis.

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    Main Results:

    • The SP isomer of App(s)I was the active donor in ATP-independent ligation.
    • Ligation product showed RP configuration, indicating nucleophilic displacement with inversion.
    • Adenylylated intermediate in ATP-dependent reactions shared stereochemistry with the ATP-independent pathway.

    Conclusions:

    • T4 RNA ligase preserves specific phosphorus chirality throughout the reaction.
    • The mechanism involves direct nucleophilic attack with inversion of configuration.
    • Unusual product accumulation suggests dual reactive modes for donor molecules.