The structure of the covalent adduct formed by the interaction of 3-dimethylamino-1-propyne and the flavine of mitochondrial amine oxidase

Biochemistry
A L MaycockT P Singer

Abstract

3-Dimethylamino-1-propyne irreversibly inactivates mitochondrial monoamine oxidase from bovine liver. The inactivation results in the loss of absorption in the 450-500-nm region of the flavine spectrum and a concomitant increase in absorbance at 410 nm. For the enzyme-bound adduct epsilon410 = 28000. The spectral properties of the adduct of the liver enzyme with 3-dimethylamino-1-propyne are similar to those observed when the pig kidney enzyme is inactivated with pargyline (Chuang et al. (1974), J. Biol. Chem. 249, 2381). From a proteolytic digest of the enzyme inactivated with labeled inhibitor a flavine peptide has been isolated which contains 1 mol of inactivator/mol of flavine. The chemical and spectral properties of the adduct are those of compounds containing the structure --N--CH==CH--CH==N+ less than. It was concluded that the flavine-inhibtor adduct is a N-5 substituted dihydroflavine and its structure has been determined.

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Related Concepts

Alkynes
Metazoa
Bos indicus
Dimethylamines
Flavins
Glyoxal
Hydrogen-Ion Concentration
Mitochondria, Liver
Reversible Inhibitors of Monoamine Oxidase
Plasma Protein Binding Capacity

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