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Related Experiment Videos

Mapping and complementation studies of the gene for release factor 1.

M Ryden, J Murphy, R Martin

    Journal of Bacteriology
    |December 1, 1986
    PubMed
    Summary

    Researchers identified the Escherichia coli release factor 1 (RF1) gene, mapping it to the prfA locus. This finding clarifies the genetic basis of translation termination and suppressor mutations.

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    Area of Science:

    • Molecular Biology
    • Genetics
    • Bacteriology

    Background:

    • Escherichia coli release factor 1 (RF1) is crucial for recognizing and terminating translation at specific stop codons (UAG and UAA).
    • The genetic location of the RF1 gene was previously unconfirmed, though linked to the uar gene locus.

    Purpose of the Study:

    • To precisely map the cloned gene for RF1 in Escherichia coli.
    • To confirm the identity of the uar gene mutation.
    • To investigate the genetic location of the sueB mutation relative to RF1.

    Main Methods:

    • Utilized ColE1 plasmid integration in polA strains for gene mapping.
    • Employed complementation assays to assess phenotypic rescue.
    • Applied homologous recombination for allele cloning.

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  • Conducted P1 mapping to determine gene linkage.

    • Main Results:

    • The RF1 gene was mapped to the 27-minute mark on the E. coli chromosome, coinciding with the uar gene locus.
    • Complementation and homologous recombination confirmed that the uar mutation resides within the RF1 gene.
    • Data suggests sueB is also located at the RF1 gene locus.

    Conclusions:

    • The uar gene mutation is definitively located within the gene encoding RF1.
    • The gene for RF1 is proposed to be named prfA.
    • This study elucidates the genetic basis of translation termination and suppressor mutations in E. coli.