Determination of the mechanism of demethylenation of (methylenedioxy)phenyl compounds by cytochrome P450 using deuterium isotope effects.
The mechanism of demethylenation of (methylenedioxy)benzene (MDB), (methylenedioxy)amphetamine (MDA), and (methylenedioxy)methamphetamine (MDMA) by purified rabbit liver cytochrome P450IIB4 has been investigated by using deuterium isotope effects. A comparison of the magnitude and direction of the observed kinetic isotope effects indicates that the three compounds are demethylenated by different mechanisms. The different mechanisms of demethylenation have been proposed on the basis of comparisons of the observed biochemical isotope effects with the isotope effects from purely chemical systems.
Department of Pharmacology, UCLA School of Medicine 90024-1735.
J M
JM
Fukuto
Y
Y
Kumagai
A K
AK
Cho
D015104:3,4-Methylenedioxyamphetamine / Q000031:analogs & derivatives / Q000378:metabolism*; D000818:Animals; D003577:Cytochrome P-450 Enzyme System / Q000378:metabolism*; D003903:Deuterium; D006878:Hydroxides; D017665:Hydroxyl Radical; D007554:Isotopes; D008297:Male; D008862:Microsomes, Liver / Q000201:enzymology; D018817:N-Methyl-3,4-methylenedioxyamphetamine; D009251:NADPH-Ferrihemoprotein Reductase / Q000378:metabolism; D010084:Oxidation-Reduction; D011817:Rabbits; D013379:Substrate Specificity
D006878:Hydroxides; D007554:Isotopes; D017665:Hydroxyl Radical; D015104:3,4-Methylenedioxyamphetamine; D003577:Cytochrome P-450 Enzyme System; D003903:Deuterium; D009251:NADPH-Ferrihemoprotein Reductase; D018817:N-Methyl-3,4-methylenedioxyamphetamine