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Characterization of the purified microsomal FAD-containing monooxygenase from mouse and pig liver.

Abstract：

:The FAD-containing monooxygenase (FMO) has been purified from both mouse and pig liver microsomes by similar purification procedures. Characterization of the enzyme from these two sources has revealed significant differences in catalytic and immunological properties. The pH optimum of mouse FMO is slightly higher than that of pig FMO (9.2 vs. 8.7) and, while pig FMO is activated 2-fold by n-octylamine, mouse FMO is activated less than 20%. Compounds, including primary, secondary and tertiary amines, sulfides, sulfoxides, thiols, thioureas and mercaptoimidazoles were tested as substrates for both the mouse and pig liver FMO. Km- and Vmax-values were determined for substrates representative of each of these groups. In general, the mouse FMO had higher Km-values for all of the amines and disulfides tested. Mouse FMO had Km-values similar to those of pig FMO for sulfides, mercaptoimidazoles, thioureas, thiobenzamide and cysteamine. Vmax-values for mouse FMO with most substrates was approximately equal, indicating that as with pig FMO, breakdown of the hydroxyflavin is the rate limiting step in the reaction mechanism. Either NADPH or NADH will serve as an electron donor for FMO, however, NADPH is the preferred donor. Pig and mouse FMOs have similar affinity for NADPH (Km = 0.97 and 1.1 microM, respectively) and for NADH (Km = 48 and 73 microM, respectively). An antibody, prepared by immunizing rabbits with purified pig liver FMO, reacts with purified pig liver FMO but not with mouse liver FMO, indicating structural differences between these two enzymes. This antibody inhibited pig FMO activity up to 60%.

journal_name

Chem Biol Interact

journal_title

Chemico-biological interactions

authors

Sabourin PJ,Hodgson E

doi

10.1016/0009-2797(84)90025-5

subject

Has Abstract

pub_date

1984-09-15 00:00:00

pages

125-39

issue

2

eissn

0009-2797

issn

1872-7786

pii

0009-2797(84)90025-5

journal_volume

51

pub_type

杂志文章

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