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Abstract
The assembly of cytochrome-c oxidase was studied in human cells cultured in the presence of inhibitors of mitochondrial or cytosolic protein synthesis. Mitochondrial fractions were resolved using two-dimensional PAGE (blue native PAGE and tricine/SDS/PAGE) and subsequent western blots were developed with monoclonal antibodies against specific subunits of cytochrome-c oxidase. Proteins were also visualized using metabolic labeling followed by two-dimensional electrophoresis and fluorography. These techniques allowed identification of two assembly intermediates of cytochrome-c oxidase. Assembly of the 13 subunits of cytochrome-c oxidase starts with the association of subunit I with subunit IV. Then a larger subcomplex is formed, lacking only subunits VIa and either VIIa or VIIb.
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