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• W2038951842 abstract "The effects of two inhibitors of electron transfer in the cytochrome b(6)f complex have been studied in whole cells of Chlamydomonas reinhardtii. DNP-INT affected equally the two steps of the concerted oxidation of plastoquinol at the Q(o) site; it decreased the rates of both cytochrome f reduction and cytochrome b(6) turnover, without affecting the amplitude of their redox signals. On the contrary, DBMIB inhibited only the rate of cytochrome f reduction while reducing, at the same time, the amplitude of cytochrome b(6) signals. The accessibility of DNP-INT to the Q(o) site was unaffected by preillumination, while that of DBMIB was greatly enhanced, even after a single turnover of the cytochrome b(6)f complex. Similar results were obtained with a mutant strain (FUD2) where the Q(o) site has an affinity for plastoquinol that is diminished by a factor of approximately 50 [Finazzi, G., et al. (1997) Biochemistry 36, 2867-2874]. However, the binding of the two inhibitors was differentially influenced by the mutation: a factor of approximately 250 was calculated for DNP-INT and a factor of only approximately 5 for DBMIB. This suggests that they bind within the Q(o) site in two distinct pockets, which are differentially involved in the process of quinol oxidation, in agreement with a recent model where two distinct positions for the reduced and semireduced quinones are considered [Crofts, A. R., and Berry, E. A. (1998) Curr. Opin. Struct. Biol. 8, 501-509]." @default.
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• W2038951842 title "Effects of Inhibitors on the Activity of the Cytochrome <i>b</i>₆<i>f</i> Complex: Evidence for the Existence of Two Binding Pockets in the Lumenal Site" @default.
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• W2038951842 doi "https://doi.org/10.1021/bi990424+" @default.
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