Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
2049629 | FEBS Letters | 2008 | 5 Pages |
Abstract
In the presence of the uncoupler, external zinc ions inhibit rapidly turnover of cytochrome c oxidase reconstituted in phospholipid vesicles or bound to the membrane of intact mitochondria. The effect is promoted by electron leaks into the oxidase during preincubation with Zn2+. Inhibition of liposome-bound bovine cytochrome oxidase by external Zn2+ titrates with a Ki of 1 ± 0.3 μM. Presumably, the Zn2+-binding group at the positively charged side is not reactive in the oxidized enzyme, but becomes accessible to the cation in some partially reduced state(s) of the oxidase; reduction of CuB is tentatively proposed to be responsible for the effect.
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Authors
Tatiana V. Vygodina, Wiolanta Zakirzianova, Alexander A. Konstantinov,