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Reductive trapping of substrate to methylamine oxidase from Arthrobacter P1
Author(s) -
Hartmann Christa,
Klinman Judith P.
Publication year - 1990
Publication title -
febs letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.593
H-Index - 257
eISSN - 1873-3468
pISSN - 0014-5793
DOI - 10.1016/0014-5793(90)80611-l
Subject(s) - methylamine , amine oxidase , chemistry , substrate (aquarium) , benzylamine , enzyme , arthrobacter , cofactor , oxidase test , amine gas treating , covalent bond , stereochemistry , biochemistry , medicinal chemistry , organic chemistry , biology , ecology
Methylamine oxidase (EC 1.4.3.6) from Arthrobacter P1 was inactivated by NaCNBH 3 in the presence of [ 14 C]benzylamine, leading to the incorporation of 1 mol of radiolabeled substrate/mol of enzyme subunit at complete inactivation. By contrast, no labeling of enzyme was observed using [ 3 H]NaCNBH 3 as reductant. These results are analogous to those previously reported for the eukaryotic enzyme, bovine serum plasma anaine oxidase [(1987) J. Biol. Chem. 262, 962‐965]. The observed pattern of labeling is consistent with the presence of dicarbonyl cofactor at the active site of methylamine oxidase. Further, these studies suggest that our reductive trapping technique, in which the pattern of radiolabeling of an enzyme is compared using C‐14 substrate vs tritiated reductant, may serve as a general assay for covalently bound dicarbonyl structures.