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. 1975 Nov 18;14(23):5123-8.
doi: 10.1021/bi00694a016.

The subunit structure of the cytochrome c oxidase complex

M Briggs, P F Kamp, N C Robinson, R A Capaldi

The subunit structure of the cytochrome c oxidase complex

M Briggs et al. Biochemistry. .

Abstract

The subunit structure of the cytochrome c oxidase complex has been obtained for three preparations each isolated by a different detergent procedure. Six polypeptides were present in all samples with the following molecular weights: subunits I, 36000; II, 22500, III, 17100; IV, 12500; V, 9700; and VI, 5300. These subunits have been purified by gel filtration in sodium dodecyl sulfate or in 6 M guanidine hydrochloride and their amino acid compositions have been determined. Subunit I is hydrophobic in character with a polarity of 35.7%. Subunits II through VI are more hydrophilic with polarities of 45.5, 48.6, 47.8, 49.7, and 53.7%, respectively.

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