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• W2064375934 startingPage "9" @default.
• W2064375934 abstract "Structures of reaction intermediates of bovine cytochrome c oxidase (CcO) in the reactions of its fully reduced form with O2 and fully oxidized form with H2O2 were investigated with time-resolved resonance Raman (RR) and infrared spectroscopy. Six oxygen-associated RR bands were observed for the reaction of CcO with O2. The isotope shifts for an asymmetrically labeled dioxygen, (16)O(18)O, has established that the primary intermediate of cytochrome a3 is an end-on type dioxygen adduct and the subsequent intermediate (P) is an oxoiron species with Fe=O stretch (nu(Fe=O)) at 804/764 cm(-1) for (16)O2/(18)O2 derivatives, although it had been long postulated to be a peroxy species. The P intermediate is converted to the F intermediate with nu(Fe=O) at 785/751 cm(-1) and then to a ferric hydroxy species with nu(Fe-OH) at 450/425 cm(-1) (443/417 cm(-1) in D2O). The rate of reaction from P to F intermediates is significantly slower in D2O than in H2O. The reaction of oxidized CcO with H2O2 yields the same oxygen isotope-sensitive bands as those of P and F, indicating the identity of intermediates. Time-resolved infrared spectroscopy revealed that deprotonation of carboxylic acid side chain takes place upon deligation of a ligand from heme a3. UV RR spectrum gave a prominent band due to cis C=C stretch of phospholipids tightly bound to purified CcO." @default.
• W2064375934 created "2016-06-24" @default.
• W2064375934 creator A5088930598 @default.
• W2064375934 date "2000-11-01" @default.
• W2064375934 modified "2023-09-23" @default.
• W2064375934 title "Structures of reaction intermediates of bovine cytochrome c oxidase probed by time-resolved vibrational spectroscopy" @default.
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• W2064375934 doi "https://doi.org/10.1016/s0162-0134(00)00155-0" @default.
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