FIG. 10.

Putative regulatory sites in the promoter region of the pst operon of C. acetobutylicum. The transcription start point of the pst operon is marked by a gray circle and +1. The deduced −10 and −35 promoter sequences are boxed. Bold arrowheads above the sequence indicate direct 11-bp repeats and arrowheads below the sequence an inverted repeat. Thick bars over sequences represent those exactly matching the B. subtilis Pho box motif, and thin bars over sequences represent those of similar motifs in which two nucleotides are changed. The ribosome binding site of pstS is underlined, and the start codon is printed in bold letters.