Photosynthesis gene cluster arrangement in the purple bacteria Bradyrhizobium sp, R. centenum, R. rubrum, and Rhodobacter capsulatus. Genes are presented as arrows indicating their direction of transcription. Genes are colored as listed: chlorophyll biosynthesis (bch) in green, carotenoid biosynthesis (crt) in yellow, reaction centers (puf) and light-harvesting complexes (puh) in red, regulatory proteins (aerR, ppsR, and crtJ) in purple, other functional proteins in light blue, and uncharacterized genes in white. Brbphp in orange is a bacteriophytochrome unique in Bradyrhizobium sp. Lines illustrate gene rearrangement, and arrows illustrate the inversion of large superoperonal clusters.
Lu et al. BMC Genomics 2010 11:325 doi:10.1186/1471-2164-11-325