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Related Experiment Videos

A link between streptomycin and rifampicin mutation.

S L Chakrabarti, L Gorini

    Proceedings of the National Academy of Sciences of the United States of America
    |June 1, 1975
    PubMed
    Summary

    Mutations in strA make E. coli susceptible to bacteriophage T7, but rif mutations can block this. This suggests a link between ribosome function and bacteriophage T7 genome transcription.

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    Interaction between mutations of ribosomes and RNA polymerase: a pair of strA and rif mutants individually temperature-insensitive but temperature-sensitive in combination.

    Proceedings of the National Academy of Sciences of the United States of America·1977

    Area of Science:

    • Microbiology
    • Molecular Biology
    • Genetics

    Background:

    • Certain mutations in Escherichia coli, specifically strA, can render the bacteria permissive to bacteriophage T7 infection.
    • Rifampicin resistance (rif) mutations have been observed to reverse this permissive phenotype conferred by strA mutations.

    Purpose of the Study:

    • To investigate the functional relationship between ribosomal protein S1 (encoded by strA) and bacteriophage T7 genome transcription.
    • To elucidate the mechanism by which rif mutations counteract the effects of strA mutations on bacteriophage T7 permissiveness.

    Main Methods:

    • Genetic analysis of Escherichia coli strains with specific mutations (strA and rif).
    • Assessment of bacteriophage T7 permissiveness in different mutant strains.
    • Quantification of bacteriophage T7 genome transcription levels in relation to bacterial mutations.

    Main Results:

    • strA mutations confer permissiveness to bacteriophage T7, correlating with enhanced T7 genome transcription.
    • Introduction of non-permissive rif alleles into strA mutant strains significantly reduces or eliminates T7 genome transcription.
    • These findings imply a functional connection between the bacterial ribosome and the bacteriophage T7 RNA polymerase.

    Conclusions:

    • The study establishes a link between the function of the bacterial ribosome and the transcriptional activity of bacteriophage T7.
    • Ribosomal mutations (strA) influence bacteriophage transcription, and specific resistance mutations (rif) can restore normal regulation.
    • This suggests that components of the translational machinery can directly or indirectly impact viral gene expression.

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