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• W2035341774 abstract "The structures of P(M) and F intermediates of bovine and Paracoccus denitrificans cytochrome c oxidase were investigated by perfusion-induced attenuated total reflection-Fourier transform infrared (ATR-FTIR) spectroscopy. Transitions from the fast oxidized state to the P(M) or F states were initiated by perfusion with buffer containing either CO/oxygen or H(2)O(2). Intermediates were quantitated by simultaneous monitoring of visible absorption changes in the protein film. For both bovine and P. denitrificans oxidase, the major features of the IR difference spectrum of P(M) were similar when produced by CO/oxygen or by H(2)O(2) treatments. These IR difference spectra were distinctly different from the IR difference spectrum of F that formed with extended treatment with H(2)O(2). Some IR bands could be assigned tentatively to perturbations of heme a(3) ring modes and substituents, and these perturbations were greater in P(M) than in F. Other bands could be assigned to surrounding protein changes. Strong perturbation of the environment of a carboxylic acid, most likely E-242 (bovine numbering), occurred in P(M) and relaxed back in F. A second redox-sensitive carboxylic acid was also perturbed in the bovine P(M) intermediate. Further consistent signatures of P(M) in both oxidases that were absent in F were strong negative bands at 1547 and 1313 cm(-1) in bovine oxidase (1542 and 1314 cm(-1) in P. denitrificans) and a positive band at approximately 1519 cm(-1). From comparison with available IR data on model compounds, it is suggested that these reflect changes in the covalent tyrosine-histidine ligand to Cu(B). These findings are discussed in relation to the oxidase catalytic cycle." @default.
• W2035341774 created "2016-06-24" @default.
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• W2035341774 date "2003-07-01" @default.
• W2035341774 modified "2023-09-23" @default.
• W2035341774 title "ATR-FTIR Spectroscopy of the P_M and F Intermediates of Bovine and <i>Paracoccus denitrificans</i> Cytochrome <i>c</i> Oxidase" @default.
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• W2035341774 doi "https://doi.org/10.1021/bi034522d" @default.
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