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The FASEB Journal, Vol 10, 683-689, Copyright © 1996 by The Federation of American Societies for Experimental Biology

REVIEWS

Structural flexibility and functional versatility of mammalian P450 enzymes

M Negishi, T Uno, TA Darden, T Sueyoshi and LG Pedersen
Laboratory of Reproductive and Developmental Toxicology, National Institute of Environmental Health Sciences, National Institutes of Health, Research Triangle Park, North Carolina 27709 USA.

P450 enzymes have evolved into a large superfamily that displays great diversity in substrate and product specificities by fixing the natural amino acid substitutions with high frequency. Site-directed mutagenesis has been used to correlate the substitutions with the diverse specificities in various P450s. As a result, the common residues that determine the specificities of various mammalian P450s have been identified and aligned to the corresponding residues in the substrate- heme pocket of the 3-dimensional structures of bacterial P450s. The substrate-heme pocket appears to be structurally variable so that only a minor substitution (Ala -> -> Val, for example) at the critical positions is enough to define the altered specificity. Thus, the structural variability of the P450s provides the inherent versatility in acquiring a novel activity. Recent mutational studies indicate that the side chain size is the major determining factor of specificity, outweighing other factors such as polarity. Further understanding of the paradoxical characteristics observed may provide us with the underlying principles that determine P450 activities, and may lead to the ability to predict P450 activities based on the types of key amino acid residues.


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