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An enzymatically driven membrane reconstitution from solubilized components.

D W Deamer, D E Boatman

    The Journal of Cell Biology
    |February 1, 1980
    PubMed
    Summary
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    Rat liver microsomes were solubilized using acyltransferase substrates, then reformed into vesicular membranes. This process preserves key proteins and enzyme activity, offering a model for membrane biogenesis studies.

    Area of Science:

    • Biochemistry
    • Cell Biology
    • Membrane Biology

    Background:

    • Acyltransferase activity is found in various membranes, including rat liver microsomes.
    • Enzyme substrates, lysophosphatides and acyl CoA derivatives, exhibit detergent properties.

    Purpose of the Study:

    • To investigate the use of acyltransferase substrates for solubilizing and re-forming rat liver microsomes.
    • To characterize the reconstituted membranes and assess their suitability as a model system.

    Main Methods:

    • Solubilization of rat liver microsomes using detergent effects of enzyme substrates.
    • Incubation of solubilized fractions to allow acyltransferase-mediated re-formation of vesicular membranes.
    • Analysis of reconstituted membranes using gel electrophoresis, enzyme activity assays, and freeze-fracture electron microscopy.

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    Main Results:

    • Reconstituted membranes retained major protein components of original microsomes.
    • NADPH-cytochrome c reductase activity in reconstituted membranes was 70% of original specific activity.
    • Freeze-fracture electron microscopy confirmed the presence of intramembrane particles on all fracture faces of reconstituted membranes.

    Conclusions:

    • The study demonstrates a method for reconstituting functional vesicular membranes from solubilized microsomes.
    • The reconstituted system serves as a valuable model for studying membrane biogenesis involving acyltransferase activity in vivo.