The complexes of NO with CuB of cytochrome c oxidase in which cytochrome a3 may or may not be ligated to cyanide or fluoride are photodissociable. NO does not appear to react with CuB in complexes of cytochrome c oxidase in which sulphide or mercaptans are ligated to the haem iron of cytochrome a3. A comparison is made between the photoreactivity of the complexes of NO with cytochrome c oxidase and those with ceruloplasmin, ascorbate oxidase, and haemocyanin. It is shown that the photoreactivity of CuB 2+.NO in cytochrome c oxidase is not unique for this enzyme, but may also be observed in the complexes of NO with type-1 copper-containing enzymes. This would suggest that the ligation of CuB in cytochrome c oxidase shows some similarity to type-1 copper in blue oxidases.

译文

NO与细胞色素c氧化酶CuB的复合物是可光解的,其中细胞色素a3可能与氰化物或氟化物连接或不连接。NO似乎不会与细胞色素c氧化酶配合物中的CuB反应,其中硫化物或硫醇与细胞色素a3的血红素铁连接。比较了NO与细胞色素c氧化酶的配合物与铜蓝蛋白,抗坏血酸氧化酶和血色素的配合物的光反应活性。结果表明,细胞色素c氧化酶中CuB 2.NO的光反应不是该酶唯一的,但也可以在NO与1型含铜酶的复合物中观察到。这表明CuB在细胞色素c氧化酶中的连接与蓝色氧化酶中的1型铜有些相似。

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