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Isolation of a recombination-deficient mutant of Streptococcus lactis ML3

D G Anderson, L L McKay

    Journal of Bacteriology
    |August 1, 1983
    PubMed

    Insights

    A new mutant of Streptococcus lactis, MMS36, is sensitive to DNA damaging agents like methyl methanesulfonate and UV light. This mutant is deficient in homologous recombination, impacting DNA repair mechanisms.

    Area of Science:

    • Microbiology
    • Molecular Biology
    • Genetics

    Background:

    • Streptococcus lactis is a key lactic acid bacterium.
    • DNA repair mechanisms are crucial for bacterial survival and genome stability.
    • Mutagenesis studies help elucidate DNA repair pathways.

    Purpose of the Study:

    • To isolate and characterize recombination-deficient mutants of Streptococcus lactis.
    • To investigate the role of homologous recombination in DNA repair in Streptococcus lactis.
    • To understand the sensitivity of mutants to DNA damaging agents.

    Main Methods:

    • Isolation of a mutant (MMS36) based on sensitivity to methyl methanesulfonate.
    • Assessment of mutant sensitivity to UV irradiation.
    • Evaluation of homologous recombination proficiency using plasmid and chromosomal markers via transduction.

    Main Results:

    • The isolated mutant MMS36 exhibited sensitivity to both methyl methanesulfonate and UV irradiation.
    • MMS36 demonstrated an inability to mediate homologous recombination.
    • Recombination deficiency was evident for plasmid-linked markers but not chromosomal markers.

    Conclusions:

    • The mutant MMS36 is recombination-deficient in Streptococcus lactis.
    • Homologous recombination plays a significant role in repairing DNA damage induced by methyl methanesulfonate and UV radiation in this bacterium.
    • Further studies are needed to fully characterize the genetic basis of recombination deficiency in MMS36.

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