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How lac repressor recognizes lac operator.

D V Goeddel, D G Yansura, M H Caruthers

    Proceedings of the National Academy of Sciences of the United States of America
    |August 1, 1978
    PubMed
    Summary
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    Researchers modified the lac operator DNA sequence to identify key binding sites for the lac repressor protein. The 5 methyl of thymine and 2 amino of guanine are crucial for this interaction.

    Area of Science:

    • Molecular Biology
    • Biochemistry
    • Genetics

    Background:

    • The lac operon is a fundamental system in molecular biology, regulating gene expression in bacteria.
    • Understanding the lac repressor-operator interaction is crucial for deciphering gene regulation mechanisms.

    Purpose of the Study:

    • To identify specific nucleotide residues within the lac operator that are critical for lac repressor binding.
    • To develop a refined model of the lac repressor-operator complex.

    Main Methods:

    • Chemical and enzymatic synthesis of modified lac operator DNA sequences containing nucleotide analogs.
    • Nitrocellulose filter binding assays to quantify repressor-operator interactions.
    • Integration of experimental data with existing literature.

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    Main Results:

    • Specific nucleotide modifications directly impacted repressor binding affinity.
    • The 5' methyl group of thymine and the 2' amino group of guanine were identified as key contact sites.
    • A model was proposed where the repressor binds to specific sites on one side of the operator.

    Conclusions:

    • The N7 of guanine, 5' methyl of thymine, 2' amino of guanine, and the central major groove are vital for repressor recognition.
    • The lac repressor binds to a defined surface on one face of the lac operator DNA.