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标题：Partial Purification and Substrate Specificity of Flavin-Containing Monooxygenase from Rat Brain Microsomes
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作者：Akiko KAWAJI ; Takuichi MIKI ; Eigo TAKABATAKE 等
期刊名称：Biological and Pharmaceutical Bulletin
印刷版ISSN：0918-6158
电子版ISSN：1347-5215
出版年度：1995
卷号：18
期号：12
页码：1657-1659
DOI：10.1248/bpb.18.1657
出版社：The Pharmaceutical Society of Japan
摘要：Flavin-containing monooxygenase (FMO) was partially purified from rat brain microsomes through two successive chromatographies on columns of DEAE Sepharose and 2', 5'-ADP Sepharose. The specific activity, benzydamine N-oxidation of partially purified brain FMO, was 122-fold higher than that of microsomes. A single band of 60 kDa was recognized by Western blotting analysis with anti-rat liver FMO. The K_m value of brain FMO for thiourea was 4-fold lower, but that for cysteamine was 10-fold higher than that of liver FMO. The enzymatic activity for n-octylamine was detected in neither brain nor liver FMO. Kinetic analysis for neurotoxins also revealed that K_m values of brain FMO for 1-methyl-4-phenyl-1, 2, 3, 6-tetrahydropyridine (MPTP), 1, 2, 3, 4-tetrahydroisoquinoline (TIQ) and N-methyl TIQ (NMTIQ) were lower than those of liver FMO. These results indicate that rat brain FMO catalyzes several substrates of liver FMO involving neurotoxins, but it seems likely that the kinetic properties of brain FMO are somewhat different from those of liver FMO.
关键词：flavin-containing monooxygenase;rat brain;neurotoxin