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  • Title: The riboflavin kinase encoding gene ribR of Bacillus subtilis is a part of a 10 kb operon, which is negatively regulated by the yrzC gene product.
    Author: Solovieva IM, Kreneva RA, Errais Lopes L, Perumov DA.
    Journal: FEMS Microbiol Lett; 2005 Feb 01; 243(1):51-8. PubMed ID: 15668000.
    Abstract:
    The riboflavin kinase encoding gene ribR is situated within a 12 genes locus ytmI-ytnM of the Bacillus subtilis chromosome. Here we demonstrate that ribR is transcribed as part of a 10 kb ytmI-ytnM operon. The riboflavin overproduction phenotype of B. subtilis ribC mutant strains, which is a result of the strongly reduced flavokinase activity of the riboflavin kinase/FAD synthetase RibC, was suppressed by ribR expression. Analysis of mutations with an upregulated ribR gene revealed 2 different groups of mutants. One class of mutants contained base substitutions in an 8 nucleotide sequence of the promoter region of the ytmI-ytnM operon. A second class of mutants had single point mutations within the yrzC gene or in the RBS of this gene. Dot-blot analysis of ytmI-ytnM transcription and the results of in trans complementation experiments for the yrzC mutants confirmed a role of the yrzC gene product as a negative regulator for the ytmI-ytnM operon.
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