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. 1989 Sep;171(9):4881–4887. doi: 10.1128/jb.171.9.4881-4887.1989

Gene cluster containing the genes for tyrocidine synthetases 1 and 2 from Bacillus brevis: evidence for an operon.

G Mittenhuber 1, R Weckermann 1, M A Marahiel 1
PMCID: PMC210293  PMID: 2768192

Abstract

From a genomic library of the tyrocidine producer Bacillus brevis ATCC 8185 constructed in the bacteriophage vector EMBL3, a recombinant phage which contains the structural genes coding for tyrocidine synthetases 1 and 2, TycA and TycB, was identified. The location of the tycA gene within the 16-kilobase insert of this clone, EMBL25-1, was mapped by hybridization studies by using the previously isolated tycA DNA as a probe. Restriction analyses, the construction of subclones, and the analysis of proteins encoded by the subclones located the tycB gene at the 3' end of the tycA gene and revealed that the two genes are transcribed in the same direction. Nuclease S1 protection studies and DNA sequencing studies of the intergenic region indicated that tycA and tycB are separated by a 94-base-pair noncoding region and suggested that these genes are organized as an operon.

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