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- W2000313247 abstract "Formamide is a slow-onset inhibitor of mitochondrial cytochrome c oxidase that is proposed to act by blocking water movement through the protein. In the presence of formamide the redox level of mitochondrial cytochrome c oxidase evolves over the steady state as the apparent electron transfer rate from cytochrome a to cytochrome a(3) slows. At maximal inhibition cytochrome a and cytochrome c are fully reduced, whereas cytochrome a(3) and Cu(B) remain fully oxidized consistent with the idea that formamide interferes with electron transfer between cytochrome a and the oxygen reaction site. However, transient kinetic studies show that intrinsic rates of electron transfer are unchanged in the formamide-inhibited enzyme. Formamide inhibition is demonstrated for another member of the heme-oxidase family, cytochrome c oxidase from Bacillus subtilis, but the onset of inhibition is much quicker than for mitochondrial oxidase. If formamide inhibition arises from a steric blockade of water exchange during catalysis then water exchange in the smaller bacterial oxidase is more open. Subunit III removal from the mitochondrial oxidase hastens the onset of formamide inhibition suggesting a role for subunit III in controlling water exchange during the cytochrome c oxidase reaction." @default.
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- W2000313247 date "2007-01-01" @default.
- W2000313247 modified "2023-09-23" @default.
- W2000313247 title "Formamide probes a role for water in the catalytic cycle of cytochrome c oxidase" @default.
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- W2000313247 doi "https://doi.org/10.1016/j.bbabio.2006.10.005" @default.
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