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Related Experiment Videos

Nuclear ribonucleoprotein complexes containing polyadenylate from mouse ascites cells.

T J Quinlan, P B Billings, T E Martin

    Proceedings of the National Academy of Sciences of the United States of America
    |July 1, 1974
    PubMed
    Summary

    Researchers isolated distinct nuclear ribonucleoprotein complexes containing polyadenylated RNA from mouse cells. These 15S and 17S complexes differ in protein composition from larger 30S complexes, revealing new insights into RNA processing.

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    Area of Science:

    • Molecular Biology
    • Cell Biology
    • Biochemistry

    Background:

    • Nuclear polyadenylated RNA plays crucial roles in gene expression.
    • Heterogeneous nuclear RNA (hnRNA) exists in various ribonucleoprotein (RNP) complex forms.
    • Understanding the composition of these RNPs is key to deciphering RNA metabolism.

    Purpose of the Study:

    • To characterize the distinct poly(A)-containing nuclear ribonucleoprotein complexes in mouse ascites cells.
    • To differentiate these complexes from the bulk heterogeneous nuclear RNA (hnRNA) components.
    • To identify the protein constituents of the isolated poly(A)-containing RNPs.

    Main Methods:

    • Extraction of nuclear ribonucleoprotein complexes from mouse ascites cells under specific conditions.
    • Resolution of poly(A)-containing RNA fractions using sedimentation analysis (15-17S vs. 30S complexes).

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  • Analysis of polypeptide composition of the isolated RNP particles via gel electrophoresis.

    • Main Results:

    • Nuclear poly(A)-containing RNA was extracted as 15S and 17S ribonucleoprotein complexes.
    • These complexes were distinct from the bulk 30S hnRNP particles and lacked their specific polypeptides.
    • The 17S particle comprised six polypeptides (17-30 kDa), while the 15S complex contained four polypeptides, including an 80 kDa species.

    Conclusions:

    • Mouse ascites cells contain distinct 15S and 17S nuclear ribonucleoprotein complexes associated with poly(A)-containing RNA.
    • These complexes possess unique protein compositions, differing from larger hnRNP particles.
    • The findings contribute to understanding the structural organization and protein factors involved in nuclear RNA processing and transport.