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Transport studies in bacterial membrane vesicles.

H R Kaback

    Science (New York, N.Y.)
    |December 6, 1974
    PubMed
    Summary

    Bacterial membrane vesicles effectively model active transport, particularly respiration-linked systems in E. coli, without ATP. These vesicles facilitate solute transport and offer insights into energy coupling mechanisms.

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    Area of Science:

    • Biochemistry
    • Molecular Biology
    • Cell Biology

    Background:

    • Bacterial membrane vesicles are valuable experimental systems for studying active transport mechanisms.
    • These vesicles, lacking cytoplasm, retain essential membrane components for solute transport.
    • Two primary transport systems identified: group translocation and respiration-linked transport.

    Purpose of the Study:

    • To investigate the utility of bacterial membrane vesicles for active transport research.
    • To elucidate the mechanisms of respiration-linked transport in E. coli.
    • To explore the role of (D)-lactate dehydrogenase and lac carrier protein in active transport.

    Main Methods:

    • Preparation of osmotically sensitized bacterial membrane vesicles.
    • Characterization of solute transport rates and energy coupling mechanisms.
    • Purification and reconstitution of (D)-lactate dehydrogenase in E. coli vesicles.
    • Use of fluorescent probes (dansylgalactosides) to study carrier protein accessibility.

    Main Results:

    • Vesicles catalyze active transport of various solutes, comparable to intact cells.
    • Respiration-linked transport in E. coli is coupled to (D)-lactate oxidation via a membrane-bound dehydrogenase.
    • ATP generation is not required for transport; energy is coupled to initial transport steps.
    • Reconstitution of (D)-lactate dehydrogenase restores transport activity in mutant vesicles.

    Conclusions:

    • Bacterial membrane vesicles are a robust model for active transport studies.
    • Respiration-linked transport is a significant mechanism for metabolite transport in bacteria.
    • Energy coupling in active transport involves membrane energization and specific protein interactions.
    • (D)-lactate dehydrogenase plays a crucial role in respiration-linked active transport.

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