Photoheterotrophic (anoxic/light) growth of Rhodobacter sphaeroides 2.4.1. R. sphaeroides wild-type, ΔacuI::kan mutant, ΔacuI::kan mutant complemented with constitutively expressing acuI, SPO_1914, yhdH, or ccr from the plasmid (indicated in parentheses), and ΔacuI::kan mutant carrying the null vector pBBRsm2MCS5 were grown in the minimal medium containing 3-hydroxypropionate (10 mM) (A) or succinate (10 mM) (B) as a sole carbon source. See Materials and Methods for the names of the plasmids used in the study.