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The effects of decyl aurachins C and D on the respiratory electron flow of facultative phototrophic bacteria
Author(s) -
Romagnoli Simona,
Oettmeier Walter,
Zani Davide
Publication year - 1996
Publication title -
iubmb life
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.132
H-Index - 113
eISSN - 1521-6551
pISSN - 1521-6543
DOI - 10.1080/15216549600201741
Subject(s) - rhodobacter , ubiquinol , rhodospirillaceae , cytochrome , phototroph , oxidase test , chemistry , cytochrome c oxidase , biochemistry , electron transport chain , facultative , titration , biology , cytochrome c , photosynthesis , botany , coenzyme q – cytochrome c reductase , enzyme , inorganic chemistry , mitochondrion , mutant , gene
Decyl aurachins C and D are two synthetic compounds related to the natural products aurachins C and D extracted from Stigmatella aurantiaca. Titrations of a range of partial respiratory activities in membranes from facultative phototrophs indicate that decyl aurachin C is more effective than aurachin D in inhibiting the quinol oxidase. Decyl aurachin C also affects the NADH‐ubiquinone oxidoreductase of Rhodobacter capsulatus and the cytochrome bc1 complexes of Rb. capsulatus and Rhodospirillum centenum. Titration of the light‐induced respiration in Rsp. centenum allowed us to estimate an upper limit for the ubiquinol oxidase concentration of 1.5±0.2 nmol/mg protein, or a ubiquinol oxidase/cytochrome c oxidase ratio of 3:1.