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• W2136188009 abstract "N,N'-dicyclohexylcarbodiimide (DCCD) has been reported to inhibit proton translocation by cytochrome bc(1) and b(6)f complexes without significantly altering the rate of electron transport, a process referred to as decoupling. To understand the possible role of DCCD in inhibiting the protonogenic reactions of cytochrome bc(1) complex, we investigated the effect of DCCD modification on flash-induced electron transport and electrochromic bandshift of carotenoids in Rb. sphaeroides chromatophores. DCCD has two distinct effects on phase III of the electrochromic bandshift of carotenoids reflecting the electrogenic reactions of the bc(1) complex. At low concentrations, DCCD increases the magnitude of the electrogenic process because of a decrease in the permeability of the membrane, probably through inhibition of F(o)F(1). At higher concentrations (>150 microM), DCCD slows the development of phase III of the electrochromic shift from about 3 ms in control preparations to about 23 ms at 1.2 mM DCCD, without significantly changing the amplitude. DCCD treatment of chromatophores also slows down the kinetics of flash-induced reduction of both cytochromes b and c, from 1.5-2 ms in control preparations to 8-10 ms at 0.8 mM DCCD. Parallel slowing of the reduction of both cytochromes indicates that DCCD treatment modifies the reaction of QH(2) oxidation at the Q(o) site. Despite the similarity in the kinetics of both cytochromes, the onset of cytochrome c re-reduction is delayed 1-2 ms in comparison to cytochrome b reduction, indicating that DCCD inhibits the delivery of electrons from quinol to heme c(1). We conclude that DCCD treatment of chromatophores leads to modification of the rate of Q(o)H(2) oxidation by the iron-sulfur protein (ISP) as well as the donation of electrons from ISP to c(1), and we discuss the results in the context of the movement of ISP between the Q(o) site and cytochrome c(1)." @default.
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• W2136188009 date "2000-12-01" @default.
• W2136188009 modified "2023-09-26" @default.
• W2136188009 title "DCCD Inhibits the Reactions of the Iron−Sulfur Protein in <i>Rhodobacter sphaeroides</i> Chromatophores" @default.
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• W2136188009 doi "https://doi.org/10.1021/bi001482u" @default.
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