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Use of homology modeling in conjunction with site-directed mutagenesis for analysis of structure-function relationships of mammalian cytochromes P450.

Authors
Type
Published Article
Journal
Life Sciences
0024-3205
Publisher
Elsevier
Publication Date
Volume
61
Issue
26
Pages
2507–2520
Identifiers
PMID: 9416773
Source
Medline

Abstract

In recent years, homology modeling has become an important tool to study cytochrome P450 function, especially in conjunction with experimental approaches such as site-directed mutagenesis. Molecular models of mammalian P450s can be constructed based on crystal structures of four bacterial enzymes, P450cam, P450 BM-3, P450terp and P450eryF, using molecular replacement or consensus methods. In a model built by molecular replacement, the coordinates are copied from those of a given template protein, while consensus methods utilize more then one protein as a template and are based on distance geometry calculations. The models can be used to identify or confirm key residues, evaluate enzyme-substrate interactions and explain changes in protein stability and/or regio- and stereospecificity of substrate oxidation upon residue substitution by site-directed mutagenesis. P450 models have also been utilized to analyze binding of inhibitors or activators, as well as alterations in inhibition and activation due to residue replacement.

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