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Sites of contact between lambda operators and lambda repressor

Z Humayun, D Kleid, M Ptashne

    Nucleic Acids Research
    |January 1, 1977
    PubMed
    Summary
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    The lambda repressor protein alters DNA methylation patterns in operator sequences. It selectively blocks or enhances methylation of guanine (G) residues, indicating major groove interactions.

    Area of Science:

    • Molecular Biology
    • Genetics
    • Biochemistry

    Background:

    • Bacteriophage lambda repressor protein regulates viral gene expression by binding to specific DNA operator sequences.
    • DNA methylation is a crucial epigenetic modification influencing gene regulation and protein-DNA interactions.
    • Dimethyl sulfate (DMS) is a chemical agent used to probe DNA accessibility by methylating purine residues.

    Purpose of the Study:

    • To investigate the effect of lambda repressor binding on the methylation patterns of lambda operator DNA sequences.
    • To determine the specific DNA residues affected by the repressor and infer the nature of repressor-DNA interactions.

    Main Methods:

    • Treatment of lambda operator DNA with dimethyl sulfate (DMS) in the presence and absence of lambda repressor.

    Related Experiment Videos

  • Analysis of methylation sites on purine residues (Adenine and Guanine) within the operator sequences.
  • Correlation of methylation changes with known repressor-binding sites.

    • Main Results:

    • DMS methylation of purine residues in lambda operator DNA was observed.
    • The lambda repressor significantly altered the methylation status of specific guanine (G) residues.
    • Repressor binding blocked methylation at some G sites while enhancing it at others.
    • These methylation changes were localized to the proposed repressor-binding regions within the operator.

    Conclusions:

    • The lambda repressor interacts with the major groove of the DNA helix.
    • The observed G-methylation alterations provide direct evidence for repressor contacts within the operator sequences.
    • The repressor's influence on methylation is precise and confined to specific DNA segments crucial for its binding.