Abstract
Crystalline cytochrome c oxidase and ubiquinol: cytochrome c oxidoreductase which diffracted X-rays at 7–8A˚resolution were obtained from bovine heart mitochondria. The methods for the purification and crystallization of these enzymes indicate that large membrane protein complexes are easier to purify and crystallize than smaller homologous membrane protein complexes, because the former have more hydrophilic surface than the latter. Bulky and polydispersed detergents such as Brij-35 and Tween 20 attached to the isolated complex are not always obstructive to crystallization if they are effective for stabilizing the complexes.
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