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The polypeptide chains of bovine-heart cytochrome c oxidase were preparatively isolated by a simple large-scale procedure based on gel permeation chromatography in the presence of sodium dodecyl sulphate. The resolution of the subunits as a function of the cholate and phospholipid content of the preparation was investigated. Cholate, and to a lesser extent, phospholipids interfere with the separation of the subunits; however, they do not prevent dissociation of the enzyme by SDS. Bovine-heart cytochrome c oxidase consists of six major subunits (estimated molecular weights in thousands: 40, 25, 20, 14, 12 and 10). In addition, the enzyme preparation contains at least five minor constituents, present in less than stoichiometric amounts. The first two of the three large subunits, all of which are hydrophobic, have amino-terminal N-formylmethionine. Subunit III, however, has a free methionine N-terminus.
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