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Deoxyribonucleic acid-membrane complexes in the Bacillus subtilis transformation system.

D C Dooley, E W Nester

    Journal of Bacteriology
    |May 1, 1973
    PubMed
    Summary

    Transforming deoxyribonucleic acid (DNA) binds to Bacillus subtilis cell membranes upon uptake. Integrated DNA is enriched at the membrane, suggesting integration occurs near this cellular structure.

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    Area of Science:

    • Microbiology
    • Molecular Biology
    • Genetics

    Background:

    • Bacterial transformation is a key mechanism for genetic exchange.
    • Understanding the intracellular fate of transforming DNA is crucial for microbial genetics.

    Purpose of the Study:

    • To investigate the localization and fate of transforming deoxyribonucleic acid (DNA) within Bacillus subtilis cells.
    • To determine if DNA integration occurs at the cell membrane.

    Main Methods:

    • Isolation of DNA-membrane complexes using Renografin density gradients.
    • Analysis of donor DNA association with the cell membrane post-uptake.
    • Quantification of integrated versus unintegrated donor DNA.

    Main Results:

    • Transforming DNA rapidly binds to the Bacillus subtilis cell membrane after uptake.
    • Integrated donor DNA shows a 1.5- to 1.7-fold enrichment in the membrane complex.
    • A portion of donor DNA is released from the membrane, primarily as inactive, unintegrated fragments.

    Conclusions:

    • The cell membrane serves as a site for the association of transforming DNA in Bacillus subtilis.
    • Integration of transforming DNA into the recipient genome likely occurs at or near the cell membrane.

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