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The prosthetic group of low-spin haem proteins is an iron porphyrin with two axial ligands, typically histidine, methionine or lysine. Determining the geometry of the axial ligands is an important step in structural characterisation, particularly in the paramagnetic oxidised forms. This work extends earlier studies of the hyperfine nuclear magnetic resonance (NMR) shifts of haem substituents in bis-His...
Different monohemic c-type cytochromes were analyzed by visible, EPR and 1 H NMR spectroscopies. While the visible and NMR data show unambiguously that the heme iron has a Met-His heme axial coordination, the EPR data indicate an axial ligand field typical of that for a bis-histidinyl ligation. The validity of the widely used EPR methods for the determination of the heme iron axial coordination,...
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