Figure 4

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.