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Cytoplasmic Z-RNA.

D A Zarling, C J Calhoun, C C Hardin

    Proceedings of the National Academy of Sciences of the United States of America
    |September 1, 1987
    PubMed
    Summary
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    Researchers developed specific probes to detect Z-RNA, a left-handed RNA structure. They found Z-RNA in the cytoplasm of fixed protozoan cells, confirming its existence in this cellular location.

    Area of Science:

    • Molecular Biology
    • Cell Biology
    • Biochemistry

    Background:

    • The Z-RNA conformation, a left-handed double helix, has been theoretically proposed but experimentally elusive.
    • Understanding RNA secondary structures is crucial for deciphering gene regulation and cellular function.

    Purpose of the Study:

    • To generate and characterize specific immunochemical probes for Z-RNA.
    • To investigate the presence and cellular localization of Z-RNA in fixed protozoan cells.

    Main Methods:

    • Generation and characterization of anti-Z-RNA immunoglobulin G (IgG) antibodies.
    • Immunofluorescence microscopy for Z-RNA detection in fixed protozoan cells.
    • Enzymatic digestion (RNase A, T1, DNase I, mung bean nuclease) and drug inhibition assays (doxorubicin, ethidium bromide, actinomycin D).

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  • Competitive binding assays using synthetic nucleic acid structures.

    • Main Results:

    • Specific anti-Z-RNA IgGs successfully detected Z-RNA in the cytoplasm of fixed protozoan cells.
    • Nuclear staining was observed with anti-DNA antibodies (B-DNA, Z-DNA), while pre-immune IgGs showed no binding.
    • RNase digestion abolished Z-RNA signal, whereas DNase treatment had no effect, indicating RNA specificity.
    • Doxorubicin and ethidium bromide inhibited Z-RNA antibody binding, consistent with Z-RNA's double-helical structure.
    • Competition assays confirmed the specificity of anti-Z-RNA antibodies for Z-RNA over other nucleic acid forms.

    Conclusions:

    • Specific immunochemical probes confirm the existence of Z-RNA in the cytoplasm of fixed protozoan cells.
    • These findings provide direct evidence for the Z-RNA conformation occurring in vivo.
    • The study validates the use of immunochemical approaches for identifying non-canonical nucleic acid structures within cells.