Figure 4.
FTIR spectra of cyanide-bound, ascorbate-reduced P. furiosus 1Fe-SOR in the C–N stretching region: (a) natural abundance KCN in 1H2O buffer; (b) natural abundance KCN in 2H2O buffer; (c) K13CN in 1H2O buffer; (d) K13CN in 2H2O buffer. Sample and measurements conditions are the same as those described in Figure 3.