S10/1 Interactions of nitric oxide with cytochrome c and cytochrome c oxidase
نویسندگان
چکیده
منابع مشابه
The mechanism of cytochrome C oxidase inhibition by nitric oxide.
The basic biochemistry of the inhibition of cytochrome oxidase by NO is reviewed. Three possible mechanisms that include the binding of NO to the fully reduced Fe(a3)-Cu(B) site, to the semi-reduced Fe(a3)-Cu(B) site, and to the fully oxidized Fe(a3)-Cu(B) site are confronted with the experimental data. Mathematical models are used to facilitate the analysis and to solve puzzling observations c...
متن کاملCytochrome cb-type nitric oxide reductase with cytochrome c oxidase activity from Paracoccus denitrificans ATCC 35512.
A highly active nitric oxide reductase was purified from Paracoccus denitrificans ATCC 35512, formerly named Thiosphaera pantotropha, which was anaerobically cultivated in the presence of nitrate. The enzyme was composed of two subunits with molecular masses of 34 and 15 kDa and contained two hemes b and one heme c per molecule. Copper was not found in the enzyme. The spectral properties sugges...
متن کاملNitric oxide, cytochrome c and mitochondria.
Nitric oxide (NO) and its derivative, peroxynitrite (ONOO-), inhibit mitochondrial respiration, and this inhibition may contribute to both the physiological and cytotoxic actions of NO. Nanomolar concentrations of NO rapidly and reversibly inhibited cytochrome oxidase in competition with oxygen, as shown with isolated cytochrome oxidase, mitochondria, brain nerve terminals and cells. Cultured a...
متن کاملCytochrome c oxidase.
Within the past year, the structures of the cytochrome c oxidase from the soil bacterium Paracoccus denitrificans and of the metal centers of the cytochrome c oxidase from bovine heart mitochondria, both determined at 2.8 A resolution by X-ray crystallography, have been reported. The structures form a basis for understanding the mechanism of this redox-coupled transmembrane proton pump, which i...
متن کاملThe Cytochrome C-cytochrome Oxidase Complex
In the preceding paper the oxidation of substrates by “indophenol oxidase” was demonstrated to be a joint action of cytochrome and cytochrome oxidase. It was further shown that with a given amount of oxidase the velocity of hydroquinone oxidation reached a maximum as the amount of added cytochrome was increased. The latter fact immediately suggested the probability that the rapid aerobic oxidat...
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ژورنال
عنوان ژورنال: Biochimica et Biophysica Acta (BBA) - Bioenergetics
سال: 2008
ISSN: 0005-2728
DOI: 10.1016/j.bbabio.2008.05.227