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An epoxidation mechanism of carbamazepine by CYP3A4.

Abstract：

:Human CYP3A4 catalyzes the 10,11-epoxidation of carbamazepine (CBZ). However, the epoxide is less stable in terms of potential energy than hydroxides of the six-membered aromatic ring. To clarify the reason why CYP3A4 produces such an energetically unfavorable compound, the mechanism of epoxidation of CBZ by CYP3A4 was investigated by theoretical calculations. The reaction consisted of two elementary processes in which two C-O bonds were generated stepwise. The rate-determining step was the first one and the activation energy was 21.3kcal/mol at the DFT (B3LYP/6-31G( * *)) level. The activation energy level of the first step of the 10,11-epoxidation was lower than that of the hydroxylation of the aromatic ring. For this reason, 10,11-epoxidation is more probable than hydroxylation of the aromatic ring, and only 10,11-epoxide is formed.

journal_name

Bioorg Med Chem

journal_title

Bioorganic & medicinal chemistry

authors

Hata M,Tanaka Y,Kyoda N,Osakabe T,Yuki H,Ishii I,Kitada M,Neya S,Hoshino T

doi

10.1016/j.bmc.2008.03.023

subject

Has Abstract

pub_date

2008-05-01 00:00:00

pages

5134-48

issue

9

eissn

0968-0896

issn

1464-3391

pii

S0968-0896(08)00236-8

journal_volume

16

pub_type

杂志文章

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