Among Bacillus subtilis riboflavin-resistant mutants we identified one, which differed from other regulatory mutants by overproduction of riboflavin and simultaneous upregulation of the ribC gene encoding flavokinase/FAD-synthase. Genetic and biochemical analysis showed that the ribU1 mutation determines a trans-acting factor that simultaneously regulates activity of riboflavin and truB-ribC-rpsO operons. Regulatory activity of the ribU1 mutation comprises about 10% of Rfn element activity on interaction with flavins. The ribU1 mutation can be presumably ascribed to a gene of the transcriptional regulators family.
Russian Journal of Genetics – Springer Journals
Published: Oct 11, 2009
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