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Related Experiment Videos

Expression of T4 early genes 62, 44, 45 and 46 in the lambda-T4 recombinant phage lambda 806-17.

C Y Yu, K K Mark

    The Journal of General Virology
    |June 1, 1985
    PubMed
    Summary
    This summary is machine-generated.

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    Researchers studied a lambda-T4 recombinant phage carrying T4 early genes. They found extensive expression of gene 46 and significant expression of genes 62 and 45, suggesting a new T4 promoter near gene 46.

    Area of Science:

    • Molecular Biology
    • Genetics
    • Virology

    Background:

    • Bacteriophage lambda and T4 are extensively studied viruses.
    • Recombinant phages are crucial tools for studying gene expression and regulation.
    • Understanding early gene expression in T4 phage is key to viral replication.

    Purpose of the Study:

    • To investigate the expression of cloned T4 early genes (62, 44, 45, 46) within a lambda-T4 recombinant phage.
    • To identify potential regulatory elements, including novel promoters, controlling T4 gene expression.
    • To determine the influence of expression time on the complementation efficiency of these genes.

    Main Methods:

    • Construction of a lambda-T4 recombinant phage (lambda 806-17) carrying specific T4 early genes.
    • Culturing the recombinant phage within a homoimmune lysogen to enable lambda promoter-driven gene expression.

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  • Assessing gene expression levels through complementation assays and analyzing expression extent over time.

    • Main Results:

    • Demonstrated extensive expression of T4 gene 46.
    • Observed significant expression of T4 genes 62 and 45.
    • Identified a potential new T4 promoter located proximally to gene 46.
    • Showed that gene expression, measured by complementation, increases with incubation time.

    Conclusions:

    • The cloned T4 early genes are expressed under the control of T4 promoters present on the recombinant DNA fragment.
    • A novel promoter near T4 gene 46 plays a role in regulating the expression of these early genes.
    • Expression levels of these T4 genes are time-dependent, with longer incubation periods yielding higher complementation activity.