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Intact spheroplasts of the cyanobacterium (blue-green alga) Anacystis nidulans oxidized various exogenous c-type cytochromes with concomitant outward proton translocation while exogenous ferricytochrome c was not reduced. The H(+)/e(-) stoichiometry was close to 1 with each of the cytochromes and did not depend on the actual rate of the oxidase reaction. Observed proton ejections were abolished by the uncoupler carbonyl cyanide m-chlorophenylhydrazone. Cyanide, azide, and carbon monoxide inhibited cytochrome c oxidation and proton extrusion in parallel while dicyclohexylcarbodiimide affected proton translocation more strongly than cytochrome c oxidation. The cytoplasmic membrane of A. nidulans appears to contain a proton-translocating cytochrome c oxidase similar to the one described for mitochondria.

plant physiology

Characterization of the Proton-Translocating Cytochrome <i>c</i> Oxidase Activity in the Plasma Membrane of Intact <i>Anacystis nidulans</i> Spheroplasts

Characterization of the Proton-Translocating Cytochrome c Oxidase Activity in the Plasma Membrane of Intact Anacystis nidulans Spheroplasts