Nucleotide sequence of the outB locus of Bacillus subtilis and regulation of its expression.

The outB gene is one of the genes involved in the process of spore outgrowth in Bacillus subtilis. The gene has been cloned in bacteriophage lambda and subcloned in plasmids. We have determined the sequence of 2,553 base pairs around the outB locus. The locus was found to code for a protein of about 30,000 daltons. Analysis of the in vivo transcripts from this region by RNase protection experiments revealed the presence of two start sites for transcription. Two potential promoters for these transcripts can be tentatively assigned from the sequence data. The amount of one transcript is highest during outgrowth and vegetative growth and absent during the stationary phase. The second transcript is present at a low level throughout the cell cycle.