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DNA methyltransferases affecting the sequence 5'CCGG.

S Jentsch, U Günthert, T A Trautner

    Nucleic Acids Research
    |June 25, 1981
    PubMed
    Summary
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    Bacillus subtilis phage SPbeta and Moraxella sp. encode DNA methyltransferases. Methylation of the outer cytosine in the 5

    Area of Science:

    • Molecular Biology
    • Genetics
    • Microbiology

    Background:

    • DNA methyltransferases play crucial roles in DNA modification and regulation.
    • Restriction-modification systems are essential for bacterial defense and genome maintenance.
    • The 5'CCGG sequence is recognized by specific DNA methyltransferases and restriction enzymes.

    Purpose of the Study:

    • To investigate the DNA methyltransferases encoded by B. subtilis phage SPbeta and Moraxella sp.
    • To determine the methylation specificity of these enzymes on the 5'CCGG sequence.
    • To elucidate the protective role of DNA methylation against restriction enzyme degradation.

    Main Methods:

    • Enzyme assays to characterize DNA methyltransferase activity.
    • DNA methylation analysis using B. subtilis strains with specific sensitivities to restriction enzymes.

    Related Experiment Videos

  • Restriction enzyme digestion experiments to assess DNA protection.

    • Main Results:

    • B. subtilis phage SPbeta and Moraxella sp. encode DNA methyltransferases.
    • These enzymes methylate both cytosines within the 5'CCGG sequence.
    • Methylation of the outer cytosine confers resistance to MspI restriction enzyme degradation.

    Conclusions:

    • DNA methylation by specific methyltransferases provides protection against cognate restriction enzymes.
    • Understanding these mechanisms is vital for microbial genetics and biotechnology.
    • The findings contribute to the knowledge of DNA modification and bacterial defense strategies.