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Related Experiment Videos

Isolation of a replication origin complex from Escherichia coli.

K Nagai, W Hendrickson, R Balakrishnan

    Proceedings of the National Academy of Sciences of the United States of America
    |January 1, 1980
    PubMed
    Summary

    Researchers isolated a DNA-protein complex from E. coli, identifying outer membrane proteins involved in DNA replication origins. This complex reforms upon dialysis, aiding further purification of essential replication machinery.

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    Area of Science:

    • Molecular Biology
    • Bacterial Genetics
    • Protein Biochemistry

    Background:

    • Understanding the molecular mechanisms of DNA replication initiation in bacteria is crucial.
    • The precise composition and localization of replication origin-binding proteins remain incompletely characterized in Escherichia coli.

    Purpose of the Study:

    • To isolate and characterize the protein-DNA complex associated with the replicative origin in Escherichia coli.
    • To identify the protein components of this complex and their association with cellular structures.

    Main Methods:

    • Isolation of a DNA-protein complex from labeled Escherichia coli cells.
    • Sucrose gradient centrifugation for fractionation and purification of the complex.
    • Potassium chloride gradient dissociation and dialysis for complex reformation and constituent analysis.

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  • SDS-PAGE to identify protein components.

    • Main Results:

    • A highly purified complex containing replicative origin DNA was isolated.
    • The complex dissociated above 0.2 M KCl but reformed upon dialysis.
    • Three major protein bands were identified, corresponding to outer membrane proteins.
    • The complex did not sediment with membrane fractions but adhered to the outer membrane in the presence of magnesium.

    Conclusions:

    • A specific DNA-protein complex at the replicative origin of Escherichia coli involves outer membrane proteins.
    • The complex's dissociation and reformation properties facilitate purification of its components.
    • These findings suggest a novel association of replication machinery with the bacterial outer membrane.