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  • Title: Low- and ultralow-temperature magnetic circular dichroism studies of reduced cytochromes P-450-LM2 and P-420-LM2 and of photo-products of their co-complexes. The spin-state and axial ligation of heme iron.
    Author: Sharonov YuA, Pismensky VF, Greschner S, Ruckpaul K.
    Journal: Biochem Biophys Res Commun; 1987 Jul 15; 146(1):165-72. PubMed ID: 3606614.
    Abstract:
    MCD spectra of reduced cytochromes P-450 and P-420 have been recorded in the spectral region 350-800 nm at temperatures 4.2-290 K and were compared with the respective low-temperature photolysed CO-complexes at 4.2 K. The MCD data are consistent with the suggestions that: the heme iron is high-spin in the reduced proteins and in the photolysed species; mercaptide is the protein-derived ligand of the heme iron in the reduced cytochrome P-450, as well as in its CO-complex; imidazole of histidine is the fifth ligand of the heme iron both in the reduced P-420 and its CO-complex; structural changes in the heme iron coordination sphere occur at CO-binding.
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