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Comparison of spectral properties of 3-MC induced cytochrome P-448 from rabbits and rats.

EPR and optical spectral properties of cytochrome P-488 from 3-methylcholanthrene-induced rabbits are compared with those of rats. In the EPR spectra at 77K and in the optical absorption spectra at room temperature a considerable temperature independent high spin content of the rabbit cytochrome is observed which has been estimated to about 55% by titration with n-octylamine. On the other hand the high spin content of the rat cytochrome depends strongly on temperature and amounts to about 6% at 5 degrees C and to about 35% at 34 degrees C. The binding of substrates and ligands to the rabbit cytochrome as well as its reduction by sodium dithionite are slower as compared with the rat cytochrome but also with phenobarbital-induced cytochrome P-450 from rats and rabbits. Contrary to the 3-methylcholanthrene induced cytochrome P-448 from rats, that from rabbits does not bind 3-methylcholanthrene. A particular protein structure establishing the high spin state and an absent binding site for type I substrates is assumed to be responsible for these and other peculiarities of cytochrome P-448 from 3-methylcholanthrene-induced rabbits.