Artzatbanov V, Müller M, Azzi A. Isolation and partial characterization of the cytochrome c oxidase of Micrococcus luteus (lysodeikticus).
Arch Biochem Biophys 1987;
257:476-80. [PMID:
2821914 DOI:
10.1016/0003-9861(87)90593-5]
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Abstract
The cell membrane of Micrococcus luteus (lysodeikticus) contains a respiratory chain composed of hemes a, b, and c, which contain 171, 457, and 407 pmol/mg protein, respectively. Cytochrome c oxidase, the heme a containing component, has been purified after solubilization in Triton X-100, by gel filtration on Sepharose 4B-CL ammonium sulfate precipitation and ion-exchange and affinity chromatographies on a yeast cytochrome c-Sepharose 4B column. The purified complex, which contains three polypeptides of apparent Mr 47,000, 31,000, and 19,000, has CN-sensitive ferrocytochrome c oxidase activity (Ki = 0.35 microM) and a characteristic absorption spectrum with maxima in the oxidized form at 595 and 426 nm and in the reduced form at 601 and 444 nm. The purified enzyme contains 17.4 nmol/mg protein and its copper content is 23.2 nmol/mg protein. The enzyme was purified about 100-fold with respect to its content in crude membranes. The total heme a yield, also with respect to crude membranes content, was 6.8%.
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