Journal article
The kinetic mechanism for cytochrome P450 metabolism of Type II binding compounds: Evidence supporting direct reduction
Archives of biochemistry and biophysics, Vol.511(1), pp.69-79
2011
Handle:
https://hdl.handle.net/2376/108938
PMCID: PMC3115501
PMID: 21530484
Abstract
[Display omitted]
► Nitrogen–iron coordination (type II binding) in P450 mediated reactions does not always lead to inhibition. ► Direct reduction of the type II bound P450 may be the kinetic mechanism for metabolism of some compounds. ► The off-rates for most P450 mediated reaction are very slow.
The metabolic stability of a drug is an important property that should be optimized during drug design and development. Nitrogen incorporation is hypothesized to increase the stability by coordination of nitrogen to the heme iron of cytochrome P450, a binding mode that is referred to as type II binding. However, we noticed that the type II binding compound
1 has less metabolic stability at sub-saturating conditions than a closely related type I binding compound
3. Three kinetic models will be presented for type II binder metabolism; (1) Dead-end type II binding, (2) a rapid equilibrium between type I and II binding modes before reduction, and (3) a direct reduction of the type II coordinated heme. Data will be presented on reduction rates of iron, the off rates of substrate (using surface plasmon resonance) and the catalytic rate constants. These data argue against the dead-end, and rapid equilibrium models, leaving the direct reduction kinetic mechanism for metabolism of the type II binding compound
1.
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Details
- Title
- The kinetic mechanism for cytochrome P450 metabolism of Type II binding compounds: Evidence supporting direct reduction
- Creators
- Joshua Pearson - Department of Pharmacokinetics and Drug Metabolism, Amgen Inc., 1201 Amgen Court West, Seattle, WA 98119, United StatesUpendra P Dahal - Department of Chemistry, Washington State University, P.O. Box 644630, Pullman, WA 99164-4630, United StatesDaniel Rock - Department of Pharmacokinetics and Drug Metabolism, Amgen Inc., 1201 Amgen Court West, Seattle, WA 98119, United StatesChi-Chi Peng - Department of Chemistry, Washington State University, P.O. Box 644630, Pullman, WA 99164-4630, United StatesJames O Schenk - Department of Chemistry, Washington State University, P.O. Box 644630, Pullman, WA 99164-4630, United StatesCarolyn Joswig-Jones - Department of Chemistry, Washington State University, P.O. Box 644630, Pullman, WA 99164-4630, United StatesJeffrey P Jones - Department of Chemistry, Washington State University, P.O. Box 644630, Pullman, WA 99164-4630, United States
- Publication Details
- Archives of biochemistry and biophysics, Vol.511(1), pp.69-79
- Academic Unit
- Chemistry, Department of
- Publisher
- Elsevier Inc
- Identifiers
- 99900547391001842
- Language
- English
- Resource Type
- Journal article