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A new bacterial gene (groPC) which affects lambda DNA replication.

C P Georgopoulos

    Molecular & General Genetics : MGG
    |February 28, 1977
    PubMed
    Summary
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    A bacterial mutation, groPC756, inhibits lambda DNA replication and bacterial growth. Specific lambda mutants (pi) can overcome this inhibition, suggesting a link between DNA replication and bacterial host factors.

    Area of Science:

    • Bacteriology
    • Molecular Biology
    • Genetics

    Background:

    • A bacterial mutation, groPC756, identified between the thr and leu loci, significantly impairs lambda DNA replication.
    • The groPC756 mutation also confers a temperature-sensitive growth defect in bacteria at 42°C.

    Purpose of the Study:

    • To investigate the genetic basis of the groPC756 mutation's effect on lambda DNA replication.
    • To identify bacterial host factors involved in bacteriophage lambda DNA replication.

    Main Methods:

    • Genetic mapping of the groPC756 mutation.
    • Isolation and characterization of lambda mutants (pi) resistant to the groPC756 mutation.
    • Complementation analysis using a lambda-transducing phage carrying the wild-type groPC+ allele.

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    Main Results:

    • The groPC756 mutation maps between the bacterial thr and leu genes.
    • Lambda mutants (pi) located in the lambda P gene were found to bypass the replication block caused by groPC756.
    • A lambda-transducing phage carrying groPC+ restored normal bacterial growth and lambda replication in groPC756 host cells.

    Conclusions:

    • The groPC locus represents a bacterial gene essential for lambda DNA replication.
    • Bacterial host factors encoded by the groPC locus are critical for efficient bacteriophage lambda DNA replication.
    • The groPC+ allele can complement the temperature-sensitive defect and restore lambda replication.