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[Bacteriophage MS2 mutants with disrupted phage replicase repressor activity]

A V Dishler, P P Pumpen, E Ia Gren

    Genetika
    |January 1, 1980
    PubMed
    Summary

    This study details temperature-sensitive mutants of bacteriophage MS2, revealing that mutant ts130 overproduces replicase subunits. This suggests a loss of replicase control over its own synthesis at elevated temperatures.

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    Area of Science:

    • Molecular Biology
    • Virology
    • Genetics

    Background:

    • Bacteriophage MS2 is a single-stranded RNA virus crucial for studying viral replication mechanisms.
    • Temperature-sensitive (ts) mutants are valuable tools for dissecting essential gene functions under specific conditions.

    Purpose of the Study:

    • To isolate and characterize ts-mutants of bacteriophage MS2 with defects in RNA synthesis at elevated temperatures.
    • To investigate the molecular basis of altered RNA synthesis and protein production in a specific mutant, ts130.

    Main Methods:

    • Nitrous acid (HNO2) treatment of bacteriophage MS2am623 to induce mutations.
    • Analysis of RNA synthesis kinetics and yield in infected non-suppressor cells at permissive and restrictive temperatures.
    • Quantification of phage subunit (replicase) and RNA levels to determine ratios.

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    Main Results:

    • Isolation of several ts-mutants affecting RNA synthesis at high temperatures.
    • Detailed characterization of mutant ts130: delayed RNA synthesis peak, 5-10 fold reduction in total RNA, and complete inhibition of RNA synthesis at 46°C.
    • Observed a 20-fold higher replicase/RNA ratio in ts130 compared to the wild-type at 42°C, indicating replicase overproduction.

    Conclusions:

    • Mutant ts130 exhibits significantly altered RNA synthesis and replicase production characteristics.
    • The findings suggest a defect in the replicase-RNA repressor complex activity in ts130, leading to uncontrolled replicase synthesis.
    • Control of coat protein synthesis appears unaffected in ts130, indicating specificity in the regulatory defect.