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Inhibition of respiration and destruction of cytochrome a3 by light in mitochondria and cytochrome oxidase from beef heart |
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| Authors: | Helga Ninnemann W L Butler and B L Epel |
| Institution: | Department of Biology, Revelle College University of California, San Diego, La Jolla, Calif. 92037, U.S.A. |
| Abstract: | Irradiation of beef-heart mitochondria and of cytochrome oxidase purified from beef-heart mitochondria with blue light inhibited electron transport from substrate (succinate for the mitochondria and reduced cytochrome c for the cytochrome oxidase) to O2. The irradiation treatment also destroyed cytochrome a3 as assayed by the absorption band for the reduced cyanide-cytochrome a3 complex at 587 nm in the low-temperature absorption spectrum. Irradiation under anaerobic conditions was not inhibitory. Cytochrome a3 was protected against photodestruction if cyanide was present during the irradiation. |
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