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Mutant lambda phage repressor with a specific defect in its positive control function.

L Guarente, J S Nye, A Hochschild

    Proceedings of the National Academy of Sciences of the United States of America
    |April 1, 1982
    PubMed
    Summary
    This summary is machine-generated.

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    A mutant lambda phage repressor lost its activator function, failing to stimulate transcription. This repressor mutant still binds operator sites and represses promoters, indicating a specific defect in transcriptional activation.

    Area of Science:

    • Molecular Biology
    • Genetics
    • Virology

    Background:

    • The lambda phage repressor protein regulates gene transcription through both activation and repression.
    • The repressor's amino-terminal domain is crucial for stimulating transcription from the PRM promoter.

    Purpose of the Study:

    • To characterize a mutant lambda phage repressor with a specific loss of transcriptional activator function.
    • To investigate the role of the amino-terminal domain in repressor-mediated transcriptional activation.

    Main Methods:

    • Genetic analysis of a lambda phage repressor mutant.
    • Assessment of repressor binding to operator sites.
    • Assay of repressor's effect on transcription from lambda phage promoters (PR, PL, and PRM).

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    Main Results:

    • The mutant repressor retains DNA binding and repression capabilities at PR and PL promoters.
    • The mutant repressor fails to stimulate transcription from the PRM promoter.
    • The mutation is located in the amino-terminal domain, previously implicated in PRM activation.

    Conclusions:

    • The mutation specifically disrupts the activator function of the lambda phage repressor.
    • The amino-terminal domain of the repressor is essential for contacting RNA polymerase to activate PRM transcription.
    • This finding elucidates a key mechanism in phage gene regulation.