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- W2111903211 abstract "Complete solubilization of both the A and B forms of human brain monoamine oxidase (MAO) occurred when crude mitochondria were incubated in the presence of 50 mM octylglucoside (OG). Upon removal of this nonionic detergent by dialysis, approximately 100% of the starting activity was present in the dialysate. The effects of solubilization were examined by comparison of several properties of the membrane-bound and OG-treated oxidases. The percentage inhibition of phenylethylamine (PEA) and the 5-hydroxytryptamine (5-HT) deamination by deprenyl and clorgyline were identical. The Km values obtained for the deamination of PEA, a B-selective substrate, 5-HT, an A-selective substrate, and tyramine (TYR), a nonselective substrate, were also comparable. OG was found to inhibit type A (I50 = 8.1 mM) and B (I50 = 4.7 mM) MAO activities at concentrations at least 10-fold below those used to solubilize the oxidases. Kinetic studies revealed that OG was an apparent competitive inhibitor of PEA deamination whereas OG produced a mixed-type pattern of inhibition when 5-HT was the variable substrate. Inhibition of TYR deamination by either the A or B form of MAO produced a mixed pattern of inhibition. The findings herein suggest that solubilization of the A and B forms of MAO by OG does not significantly alter the substrate and inhibitor specificity of the oxidases following removal of detergent. However, in the presence of concentrations of OG 50 times less than the critical micellar concentration of this detergent, marked inhibition of deamination by both forms of human brain MAO is observed. Accordingly, the usefulness of OG is limited to situations where the detergent is completely removed before quantitation of MAO activity." @default.
- W2111903211 created "2016-06-24" @default.
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- W2111903211 date "1983-07-01" @default.
- W2111903211 modified "2023-09-26" @default.
- W2111903211 title "Human brain monoamine oxidase: Solubilization and kinetics of inhibition by octylglucoside" @default.
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- W2111903211 doi "https://doi.org/10.1016/0003-9861(83)90233-3" @default.
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