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Template-directed polymerization of oligoadenylates using cyanogen bromide.

E Kanaya, H Yanagawa

    Biochemistry
    |November 18, 1986
    PubMed
    Summary

    Cyanogen bromide (BrCN) facilitates the aqueous condensation of oligoadenylates (oligo(A)) on a poly(uridylic acid) template. Divalent metal ions and imidazole derivatives are crucial for this polymerization, influencing linkage types and yields.

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    Cloning of the RNase H genes from a metagenomic DNA library: identification of a new type 1 RNase H without a typical active-site motif.

    Journal of applied microbiology·2010

    Area of Science:

    • Prebiotic Chemistry
    • Origin of Life Studies
    • Nucleic Acid Chemistry

    Background:

    • Understanding the prebiotic synthesis of oligonucleotides is key to understanding the origin of life.
    • Cyanogen bromide (BrCN) has been explored as a potential prebiotic condensing agent.
    • Oligoadenylate (oligo(A)) polymerization on templates like poly(uridylic acid) [poly(U)] is a model for RNA synthesis.

    Purpose of the Study:

    • To investigate the condensation of oligoadenylates using cyanogen bromide (BrCN) in aqueous solution.
    • To determine the role of imidazole, divalent metal ions, and template concentration in oligo(A) polymerization.
    • To analyze the linkage isomers formed and propose a reaction mechanism.

    Main Methods:

    • Oligoadenylate condensation catalyzed by cyanogen bromide (BrCN) on a poly(uridylic acid) [poly(U)] template.
    • Varying concentrations of poly(U) and different divalent metal ions (Mn2+, Co2+, Ni2+, Cu2+, Zn2+, Mg2+, Fe2+).
    • Analysis of product chain length, yield, and phosphate bond linkage isomers (2',5', 3',5', and 5',5').
    • Identification of imidazole-derived intermediates (N-cyanoimidazole, N,N'-iminodiimidazole).

    Main Results:

    • Cyanogen bromide (BrCN) successfully condensed oligoadenylates (oligo(A)) on a poly(uridylic acid) [poly(U)] template, achieving a 68% overall yield for (pA)48 formation.
    • Optimal yields required a five- to sevenfold molar excess of poly(U) and the presence of imidazole and specific divalent metal ions.
    • Metal ions influenced linkage isomer formation: Co2+, Zn2+, and Ni2+ favored phosphodiester bonds (30% 3',5' with Ni2+), while Mn2+ favored pyrophosphate bonds.

    Conclusions:

    • Cyanogen bromide (BrCN) is an effective condensing agent for oligo(A) polymerization on a poly(U) template in aqueous solution.
    • Imidazole derivatives, particularly N-cyanoimidazole and N,N'-iminodiimidazole, act as key condensing agents in the reaction.
    • The study provides insights into prebiotic RNA synthesis mechanisms, highlighting the influence of metal ions on linkage fidelity.

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