Cascade regulation of dimethyl sulfoxide reductase (dor) gene expression in the facultative phototroph Rhodobacter sphaeroides 2.4.1(super T)

The mechanism behind the regulation of dimethyl sulfoxide (DMSO) reductase genes of the phototroph Rhodobacter sphaeroides by both DMSO and oxygen was studied by investigating the transcriptional regulation of the dorC, dorR and dorS promoters. The dorC::lacZ expression was minimized by up to one-third when the cells were grown photosynthetically with DMSO and with medium to high lighting. The induction also depends on the DorR and DorS proteins.