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Repression and autogenous stimulation in vitro by bacteriophage lambda repressor.

R P Dottin, L S Cutler, M L Pearson

    Proceedings of the National Academy of Sciences of the United States of America
    |March 1, 1975
    PubMed
    Summary
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    Lambda repressor protein inhibits lambda DNA-directed protein synthesis in vitro. It represses two classes of proteins via operators o-L and o-R, and stimulates its own synthesis.

    Area of Science:

    • Molecular Biology
    • Genetics
    • Biochemistry

    Background:

    • Bacteriophage lambda utilizes a repressor protein to control its gene expression.
    • Understanding the regulatory mechanisms of lambda repressor is crucial for comprehending viral replication and gene control.

    Purpose of the Study:

    • To investigate the in vitro effects of purified lambda repressor protein on lambda DNA-directed protein synthesis.
    • To elucidate the specific operators (o-L and o-R) involved in repressor-mediated gene regulation.
    • To identify potential auto-regulatory functions of the lambda repressor.

    Main Methods:

    • In vitro protein synthesis assays using lambda DNA templates.
    • Analysis of synthesized proteins via sodium dodecyl sulfate/polyacrylamide gel electrophoresis (SDS-PAGE).

    Related Experiment Videos

  • Utilizing lambda DNA templates with specific deletion and point mutations in operator regions (o-L, o-R).

    • Main Results:

    • Purified lambda repressor protein demonstrably reduced overall protein synthesis in vitro.
    • Repression was observed for two distinct classes of lambda proteins (class c via o-L, class d via o-R), with differential sensitivity to repressor concentration.
    • Some proteins, including those from the J-att region, were not repressed.
    • Lambda repressor was found to stimulate the synthesis of the repressor protein itself, acting at the prm site.

    Conclusions:

    • Lambda repressor protein functions to inhibit the expression of specific viral genes in vitro.
    • The operators o-L and o-R differentially regulate distinct sets of lambda proteins.
    • Lambda repressor exhibits a positive auto-regulatory function, enhancing its own production via the prm site.