Comparison of the promoter regions of the phyL gene from B. licheniformis and the phyC gene from B. amyloliquefaciens FZB42. Consensus sequences (− 35 and − 10) are underlined. The boxes indicate the putative ribosome binding sites. Grey shading indicates the putative PhoP binding boxes. The structure of the phyC promoter of B. amyloliquefaciens FZB42 was investigated in detail by Makarewicz et al.