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  • Title: Chloramphenicol induces translation of the mRNA for a chloramphenicol-resistance gene in Bacillus subtilis.
    Author: Duvall EJ, Lovett PS.
    Journal: Proc Natl Acad Sci U S A; 1986 Jun; 83(11):3939-43. PubMed ID: 3086871.
    Abstract:
    cat-86 is a plasmid gene specifying chloramphenicol-inducible chloramphenicol acetyltransferase activity in Bacillus subtilis. Inducibility has been suggested to result primarily from activation of the translation of cat-86 mRNA by subinhibitory levels of chloramphenicol. To directly test the involvement of transcription in cat-86 induction, the gene was transcriptionally activated with a strong promoter, resulting in the synthesis of relatively high levels of cat-86 mRNA in uninduced cells. When RNA synthesis was blocked with rifampin (100 micrograms/ml), de novo inducibility of cat-86 by chloramphenicol could be demonstrated for more than 30 min. These results indicate that concurrent transcription is not essential for cat-86 induction. Accordingly, cat-86 is one of only a few inducible bacterial genes in which the primary form of regulation is at the translational level. This form of regulation may apply to other cat genes of Gram-positive origin whose expression is also inducible by chloramphenicol.
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