Figure 3From: Repression of btuB gene transcription in Escherichia coliby the GadX proteinDNA fragments containing the btuB promoter used for lacZ fusions. The btuB initiation codon ATG is located at nucleotide position +242. Asterisk indicates the first nucleotide of the btuB mRNA. The trmA (tRNA methyltransferase) gene is located upstream from btuB. It has no known effect on btuB expression.Back to article page