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Coated vesicles: characterization, selective dissociation, and reassembly.

M P Woodward, T F Roth

    Proceedings of the National Academy of Sciences of the United States of America
    |September 1, 1978
    PubMed
    Summary
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    Researchers isolated major proteins from porcine brain coated vesicles, identifying clathrin as a key component. They found clathrin can be solubilized and reassembled into coat structures under specific conditions.

    Area of Science:

    • Cell Biology
    • Biochemistry

    Background:

    • Coated vesicles are essential for intracellular transport.
    • Understanding their protein composition is crucial for elucidating their function.

    Purpose of the Study:

    • To identify and characterize the major proteins of porcine brain coated vesicles.
    • To investigate the conditions under which clathrin, a major coat protein, can be solubilized and reassembled.

    Main Methods:

    • Sodium dodecyl sulfate/polyacrylamide gel electrophoresis (SDS-PAGE) was used to analyze protein composition.
    • Coated vesicles and their coats were isolated from porcine brain.
    • Protein solubilization and reassembly were induced using urea, MgCl2, and pH changes.

    Main Results:

    Related Experiment Videos

  • Three major proteins (180,000, 125,000, and 55,000 daltons) constituted 73% of coated vesicle protein.
  • Clathrin (180,000 daltons) comprised 40% of the total coated vesicle protein.
  • Clathrin was solubilized by 2 M urea, 0.25 M MgCl2, or pH 7.5 and could be reassembled into coat structures.
  • Conclusions:

    • Clathrin is the predominant protein in porcine brain coated vesicle coats.
    • Clathrin's ability to disassemble and reassemble suggests a dynamic role in vesicle formation and transport.