Comparison of ubiquinol and cytochrome c terminal oxidases
- 26 July 1993
- journal article
- research article
- Published by Wiley in FEBS Letters
- Vol. 327 (2) , 131-136
- https://doi.org/10.1016/0014-5793(93)80156-o
Abstract
There have been numerous instances in the recent literature where the properties of ubiquinol and cytochrome c terminal oxidases are compared. Here we specifically examine the cytochrome bo 3-type ubiquinol oxidase from Escherichia coli and the cytochrome aa 3-type cytochrome c oxidases. A second redox-active copper site (CuA) is present only in the cytochrome c oxidases and the physiological electron donors for the two enzymes are different (ubiquinol-8 vs. ferrocytochrome c). In our opinion, these differences are significant and most likely indicate that distinct turnover mechanisms are operative in the two enzymes.Keywords
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