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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Selective removal of subunit VIb increases the activity of cytochrome c oxidase.

Bovine heart cytochrome c oxidase was gel-filtered on Sephacryl S-300 in 0.05% dodecyl maltoside and in the presence or absence of 1 M KCl. The presence of KCl selectively removed subunit VIb from the enzyme complex, resulting in about doubling of enzymatic activity and an increase of the Km for ferrocytochrome c. In contrast, the proton pumping activity of the enzyme was unchanged. The increase of activity is due to removal of subunit VIb and not of lipids, because titration with asolectin or dodecyl maltoside could not abolish the difference in activity between the 12- and 13-subunit enzyme. Attempts to reconstitute cytochrome c oxidase from its separated components were unsuccessful. It is concluded that subunit VIb suppresses the activity of the mammalian enzyme complex by interaction with the active center.[1]


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