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Polyadenylic-polyxanthylic-polyuridylic acid triple helix

P F Torrence, E De Clercq

    Biochemistry
    |March 22, 1977
    PubMed
    Summary

    Poly(xanthylic acid) [X]n inhibited interferon induction by poly(adenylic-uridylic acid) [A)n-(U)n] in kidney cells. This suggests [X]n forms new triple helices, altering interferon response.

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    Area of Science:

    • Virology
    • Molecular Biology
    • Immunology

    Background:

    • Interferon induction is a key antiviral defense mechanism.
    • Double-stranded RNA analogs can trigger interferon production.
    • Poly(adenylic-uridylic acid) [A)n-(U)n] is a known interferon inducer.

    Purpose of the Study:

    • To investigate the effect of poly(xanthylic acid) [X)n] on interferon induction by [A)n-(U)n].
    • To elucidate the molecular interactions between [X)n] and [A)n-(U)n].

    Main Methods:

    • Primary rabbit kidney cells were "superinduced" using actinomycin D and cycloheximide.
    • Interferon induction capacity was measured under various conditions.
    • Physicochemical techniques including mixing curves, melting profiles, ribonuclease resistance, and sucrose gradient ultracentrifugation were employed.

    Main Results:

    • Poly(xanthylic acid) [X)n] abolished the interferon-inducing ability of poly(adenylic-uridylic acid) [A)n-(U)n].
    • [X)n] had a minimal effect on the interferon induction by poly(inosinic-cytidylic acid) [I)n-(C)n].
    • Evidence indicated the formation of new triple helical structures involving [X)n] and [A)n-(U)n].

    Conclusions:

    • Poly(xanthylic acid) [X)n] interferes with the interferon-inducing activity of poly(adenylic-uridylic acid) [A)n-(U)n].
    • The interaction leads to the formation of novel triple-helical complexes.
    • These interactions likely underlie the observed inhibition of interferon production.

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