title: An infrared study of the carbon monoxide complexes of cytochrome P-450 and cytochrome P-420.
abstract: The infrared stretch vibrations (upsilonCO) of the CO-complexes of cytochrome P-450 and cytochrome P-420 have been determined from infrared difference spectra. The CO-complexes exhibit IR-bands at 1949 cm-1 and 1966 cm-1 with half widths of approximately 17 cm-1 and approximately 20 cm-1 respectively. These results are compared with the CO-stretch frequencies of other haemoproteins and discussed with respect to specific interactions of the CO-ligand with the protein moiety and to the ligand trans to CO of the cytochromes.
mesh_terms: D001665:Binding Sites; D002248:Carbon Monoxide; D003577:Cytochrome P-450 Enzyme System; D003580:Cytochromes; D013055:Spectrophotometry, Infrared
chemical_list: D003580:Cytochromes; D002248:Carbon Monoxide; D003577:Cytochrome P-450 Enzyme System