Energy Coupling to Pyridine Nucleotide Transhydrogenase in Chromatophores from Phototrophic Bacteria

The membrane-bound pyridine nucleotide transhydrogenase of Rhodobacter capsulatus catalysing the reaction, like that from mitochondria and from E. coli, is a consumer of Ap in the direction from left to right. It offers several important advantages in the study of energy coupling (1).