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• W124638320 abstract "The reaction of ascorbate-reduced Pseudomonas cytochrome oxidase with oxygen was studied by using stopped-flow techniques at pH 7.0 and 25 degrees C. The observed time courses were complex, the reaction consisting of three phases. Of these, only the fastest process, with a second-order rate constant of 3.3 × 10(4) M-1.S-1, was dependent on oxygen concentration. The two slower processes were first-order reactions with rates of 1.0 +/- 0.4s-1 and 0.1 +/- 0.03s-1. A kinetic titration experiment revealed that the enzyme had a relatively low affinity constant for oxygen, approx. 10(4)M-1. Kinetic difference spectra were determined for all three reaction phases, showing each to have different characteristics. The fast-phase difference spectrum showed that changes occurred at both the haem c and haem d1 components of the enzyme during this process. These changes were consistent with the haem c becoming oxidized, but with the haem d1 assuming a form that did not correspond to the normal oxidized state, a situation that was not restored even after the second kinetic phase, which reflected further changes in the haem d1 component. The results are discussed in terms of a kinetic scheme." @default.
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• W124638320 date "1978-07-01" @default.
• W124638320 modified "2023-09-24" @default.
• W124638320 title "The reaction of <i>Pseudomonas aeruginosa</i> cytochrome <i>c</i>-551 oxidase with oxygen" @default.
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• W124638320 doi "https://doi.org/10.1042/bj1730011" @default.
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