Stabilized ubisemiquinone in reconstituted succinate ubiquinone reductase.
Stabilized ubisemiquinone in reconstituted succinate ubiquinone reductase.
复制标题
重构琥珀酸泛醌还原酶中稳定的泛半醌。
DOI:
10.1016/s0006-291x(87)80512-0
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发表时间:
1987
影响因子:
3.1
通讯作者:
King,TE
中科院分区:
文献类型:
--
作者:
Xu,Y;Salerno,JC;Wei,YH;King,TE
QP-S, a ubiquinone (Q) protein, accepts electrons from succinate through succinate dehydrogenase (SDH). A new method has produced a preparation of QP-S which has a different amino acid composition and SDS gel electrophoretic pattern from that of the old preparation (Biochemistry19, 3579–3585 (1980)). The new preparation contains less than 1 nmol heme/mg protein; the activity of the preparation was not proportional to its heme content. A thenoyltrifluoroacetone sensitive free radical signal was detected by EPR spectroscopy in succinate-Q reductase reconstituted from this QP-S and SDH; the characteristics of this species identify it as ubisemiquinone. At pH 7.4, the Em of the two electron step was about 70 mV with E1= 5 mV and E2= 125 mV. The properties of the radical differed slightly from those of “Qs” radical in more intact preparations (e.g.submitochondrial particles). The present is the simplest system in which such a succinate reducible ubisemiquinone free radical has been demonstrated.
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