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Related Experiment Videos

Nuclear ribonucleoprotein particles probed in living cells

S Mayrand, T Pederson

    Proceedings of the National Academy of Sciences of the United States of America
    |April 1, 1981
    PubMed
    Summary

    Photochemical crosslinking in intact cells confirmed that heterogeneous nuclear RNA (hnRNA) and proteins form stable nuclear ribonucleoprotein (hnRNP) particles. These in vivo crosslinked hnRNP particles represent native structures, crucial for understanding gene regulation.

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    Area of Science:

    • Molecular Biology
    • Cell Biology
    • Biochemistry

    Background:

    • Nuclear ribonucleoprotein (hnRNP) particles are essential for RNA processing and transport.
    • Understanding the in vivo structure of hnRNPs is critical for elucidating gene expression regulation.

    Purpose of the Study:

    • To investigate the in vivo structure and stability of hnRNP particles.
    • To determine if hnRNP particles isolated by conventional methods represent native structures.

    Main Methods:

    • Photochemical crosslinking of hnRNA-protein contacts in intact HeLa and Friend erythroleukemia cells using 254-nm UV irradiation.
    • Isolation and characterization of crosslinked hnRNP particles via nuclear fractionation, ultracentrifugation, and density gradient banding.
    • Analysis of RNA integrity and hybridizability using gel blot hybridization.

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    Main Results:

    • In vivo crosslinked hnRNP particles were identical to non-irradiated particles by multiple criteria (fractionation, sedimentation, nuclease digestion, RNA-to-protein ratio).
    • Beta-globin RNA sequences remained intact and hybridizable after crosslinking in Friend cells.
    • Crosslinked hnRNA-protein bonds demonstrated high stability in denaturing conditions and Cs2SO4 density gradients.

    Conclusions:

    • Heterogeneous nuclear RNA (hnRNA) is tightly complexed with nuclear proteins in vivo.
    • hnRNP particles isolated through nuclear fractionation accurately represent native structures.
    • The established crosslinking method provides a reliable tool for studying hnRNP composition and organization.