Nucleotide sequence of the Rhodospirillum rubrum atp operon

The nucleotide sequence was determined of a 8775-base-pair region of DNA cloned from the photosynthetic non-sulphur bacterium Rhodospirillum rubrum. It contains a cluster of five genes encoding F1-ATPase subunits. The genes are arranged in the same order as F1 genes in the Escherichia coli unc operon. However, as in the related organism Rhodopseudomonas blastica, neither genes for components of F0, the membrane sector of ATP synthase, nor a homologue of the E. coli uncI gene are associated with this locus, as they are in E. coli.