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Related Experiment Videos

Acetylcholine receptor synthesis from membrane polysomes

J P Merlie, J G Hofler, R Sebbane

    The Journal of Biological Chemistry
    |July 10, 1981
    PubMed
    Summary
    This summary is machine-generated.

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    Researchers isolated active cytoplasmic and membrane-bound polyribosomes from mouse cells. These fractions synthesized distinct proteins, including forms of the acetylcholine receptor alpha subunit, aiding cell biology research.

    Area of Science:

    • Cell Biology
    • Molecular Biology
    • Biochemistry

    Background:

    • Polyribosomes are crucial for protein synthesis.
    • Distinguishing between cytoplasmic and membrane-bound polyribosomes is important for understanding protein localization and function.
    • The BC3H-1 cell line provides a model for studying these processes.

    Purpose of the Study:

    • To establish conditions for effective fractionation of cytoplasmic and membrane-bound polyribosomes.
    • To assess the protein synthesis activity and specificity of the isolated polyribosome fractions.
    • To identify the proteins synthesized by membrane-bound versus cytoplasmic polyribosomes, particularly those related to the acetylcholine receptor.

    Main Methods:

    • Fractionation of polyribosomes from BC3H-1 mouse cell line.

    Related Experiment Videos

  • Incubation of polyribosomes with nuclease-treated rabbit reticulocyte lysates for protein synthesis assays.
  • Immunoprecipitation and sodium dodecyl sulfate (SDS) gel electrophoresis for protein analysis.
  • Peptide mapping to characterize synthesized protein species.

    • Main Results:

    • Polyribosome fractions were obtained in high yield and purity.
    • Both cytoplasmic and membrane-bound polyribosomes were active in protein synthesis.
    • Distinct sets of proteins were synthesized by each fraction.
    • Membrane-bound polyribosomes synthesized two protein species (Mr = 39,000 and 42,000) homologous to the acetylcholine receptor alpha subunit.
    • Peptide mapping indicated these species may represent nonglycosylated and glycosylated forms.

    Conclusions:

    • The study successfully fractionated and characterized active cytoplasmic and membrane-bound polyribosomes.
    • These fractions synthesize distinct protein repertoires, highlighting differential gene expression and protein targeting.
    • The findings demonstrate that membrane-bound polyribosomes are involved in synthesizing components of the acetylcholine receptor, likely including its alpha subunit in different glycosylation states.