Fig. 2 Absorbance changes during reaction of the fully reduced ba3 CytcO with O2. Absorbance changes during reaction of the fully reduced ba3 CytcO with.

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Fig. 2 Absorbance changes during reaction of the fully reduced ba3 CytcO with O2. Absorbance changes during reaction of the fully reduced ba3 CytcO with O2. (A and B) pH 7 at 10° and 45°C, respectively. (C and D) pH 10 at 10° and 45°C, respectively. At 610 and 560 nm, the absorbance changes are mainly attributed to redox changes at heme a3 and heme b, respectively. The black lines are fits of the data with a model that is described by a sum of three exponential functions. The rate constants obtained from the fit are given in the text and in Table 1. The difference between the fit and the data (that is, the residuals) is shown below each panel. In addition, in (A), we show the residuals of a fit with a single rate constant (5 × 104 s−1) for electron transfer from heme b to the catalytic site and PR formation (gray lines). Experimental conditions after mixing: 0.6 to 0.8 μM CytcO (scaled to 1 μM), 0.05% DDM, 90 mM Hepes (pH 7) or 90 mM CAPS (pH 10), and ~1 mM O2. The cuvette path length was 1.00 cm. The 560-nm traces are shifted up by 1.7 × 10−3 units for clarity. Federica Poiana et al. Sci Adv 2017;3:e1700279 Copyright © 2017, The Authors