Rhodobacter capsulatus CycH: a bipartite gene product with pleiotropic effects on the biogenesis of structurally different c-type cytochromes

Photosynthetic-negative (Ps-) mutants of Rhodobacter capsulatus without CycH lack c-type chromosomes due to their inability to undergo cytochrome c biogenesis. The Rhodobacter capsulatus cycH mutants possess complex Ps- Nadi- growth phenotypes. The Ps+ phenotype cannot be complemented by the incomplete cytochromes of the mutants and the absence of cytochrome co and cp have made them cytochrome cd negative-bacteria.