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The low-resolution three-dimensional structure of purified native beef heart mitochondrial cytochrome c oxidase (COX) in asolectin unilamellar liposomes has been measured by small-angle neutron scattering under the conditions where the protein remains fully functional. From a neutron scattering perspective, the use of mixed-lipid liposomes provided for a more homogeneous matrix than can be achieved...
The cytochrome c oxidase activity of the bovine heart enzyme decreases substantially at alkaline pH, from 650 s −1 at pH 7.0 to less than 10 s −1 at pH 9.75. In contrast, the cytochrome c peroxidase activity of the enzyme shows little or no pH dependence (30–50 s −1 ) at pH values greater than 8.5. Under the conditions employed, it is demonstrated that the dramatic decrease...
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