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Figure 3
Fe K-edge XAS near-edge spectra showing X-ray-induced photo-reduction of superoxide reductase from Pyrococcus furiosus (data re-plotted from Clay et al., 2002BB14) showing (a) oxidized Fe(III) enzyme, (b) photo-reduced enzyme and (c) dithionite-reduced Fe(II) enzyme. The spectra of photo-reduced enzyme can be represented by a linear combination of Fe(III) and dithionite-reduced Fe(II) enzyme. The inset shows quantification of photo-reduction with time since start of irradiation using linear-combination fitting, indicating pseudo first-order kinetics (Clay et al., 2002BB14). Data were measured on SSRL BL7-3.

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