Enzymes
| UniProtKB help_outline | 982 proteins |
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- Name help_outline H2O Identifier CHEBI:15377 (Beilstein: 3587155; CAS: 7732-18-5) help_outline Charge 0 Formula H2O InChIKeyhelp_outline XLYOFNOQVPJJNP-UHFFFAOYSA-N SMILEShelp_outline [H]O[H] 2D coordinates Mol file for the small molecule Search links Involved in 6,204 reaction(s) Find molecules that contain or resemble this structure Find proteins in UniProtKB for this molecule
- Name help_outline kynuramine Identifier CHEBI:180898 Charge 1 Formula C9H13N2O InChIKeyhelp_outline QLPVTIQQFGWSQQ-UHFFFAOYSA-O SMILEShelp_outline NC1=CC=CC=C1C(=O)CC[NH3+] 2D coordinates Mol file for the small molecule Search links Involved in 1 reaction(s) Find molecules that contain or resemble this structure Find proteins in UniProtKB for this molecule
- Name help_outline O2 Identifier CHEBI:15379 (CAS: 7782-44-7) help_outline Charge 0 Formula O2 InChIKeyhelp_outline MYMOFIZGZYHOMD-UHFFFAOYSA-N SMILEShelp_outline O=O 2D coordinates Mol file for the small molecule Search links Involved in 2,709 reaction(s) Find molecules that contain or resemble this structure Find proteins in UniProtKB for this molecule
- Name help_outline 3-(2-aminophenyl)-3-oxopropanal Identifier CHEBI:180899 Charge 0 Formula C9H9NO2 InChIKeyhelp_outline IDWFMUPAEMSFNQ-UHFFFAOYSA-N SMILEShelp_outline C(CC=O)(=O)C1=CC=CC=C1N 2D coordinates Mol file for the small molecule Search links Involved in 2 reaction(s) Find molecules that contain or resemble this structure Find proteins in UniProtKB for this molecule
- Name help_outline H2O2 Identifier CHEBI:16240 (Beilstein: 3587191; CAS: 7722-84-1) help_outline Charge 0 Formula H2O2 InChIKeyhelp_outline MHAJPDPJQMAIIY-UHFFFAOYSA-N SMILEShelp_outline [H]OO[H] 2D coordinates Mol file for the small molecule Search links Involved in 449 reaction(s) Find molecules that contain or resemble this structure Find proteins in UniProtKB for this molecule
- Name help_outline NH4+ Identifier CHEBI:28938 (CAS: 14798-03-9) help_outline Charge 1 Formula H4N InChIKeyhelp_outline QGZKDVFQNNGYKY-UHFFFAOYSA-O SMILEShelp_outline [H][N+]([H])([H])[H] 2D coordinates Mol file for the small molecule Search links Involved in 528 reaction(s) Find molecules that contain or resemble this structure Find proteins in UniProtKB for this molecule
Cross-references
| RHEA:59596 | RHEA:59597 | RHEA:59598 | RHEA:59599 | |
|---|---|---|---|---|
| Reaction direction help_outline | undefined | left-to-right | right-to-left | bidirectional |
| UniProtKB help_outline |
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Related reactions help_outline
More general form(s) of this reaction
Publications
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Substrate-specific enhancement of the oxidative half-reaction of monoamine oxidase.
Tan A.K., Ramsay R.R.
Monoamine oxidases A and B have identical flavin sites but different, although overlapping, amine substrate specificity. Reoxidation of ternary complexes containing substrate is much faster than of free enzyme, and the enhancement is greater in the A form than the B form. The oxidative half-reacti ... >> More
Monoamine oxidases A and B have identical flavin sites but different, although overlapping, amine substrate specificity. Reoxidation of ternary complexes containing substrate is much faster than of free enzyme, and the enhancement is greater in the A form than the B form. The oxidative half-reaction was studied with a variety of substrates to elucidate the specificity of the effect and to probe the different influences of substrate on the flavin reoxidation in the two forms of the enzyme. The second-order rate constant for the reoxidation was highest with monoamine oxidase A when kynuramine was the ligand (508 x 10(3) M-1 s-1) compared to 4 x 10(3) M-1 s-1 in its absence. MPTP (166 x 10(3) M-1 s-1) also enhanced reoxidation well, but indole substrates stimulated only poorly (e.g., tryptamine, 29 x 10(3) M-1 s-1; serotonin, 50 x 10(3) M-1 s-1). For the A form, the reduction of the flavin was rate-limiting in all cases. For the B form, reoxidation was rate-limiting for beta-phenylethylamine and contributed to the determination of the overall rate with several substrates. The ratio of the enhanced rate of oxidation to the rate of reduction correlated with the redox state of the enzyme in turnover experiments. All the observations are consistent with alternate paths of reoxidation, via either free enzyme or a reduced enzyme-substrate complex. The flux through each path is determined by the relative dissociation constants and rate constants. << Less
Biochemistry 32:2137-2143(1993) [PubMed] [EuropePMC]
This publication is cited by 5 other entries.
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Kinetic mechanism of monoamine oxidase A.
Ramsay R.R.
Steady-state kinetic data for monoamine oxidase A in crude extracts suggest an exclusively ping-pong mechanism, in contrast to those for monoamine oxidase B, which indicate alternate mechanisms involving either a binary or ternary complex. In this study, with use of purified monoamine oxidase A, s ... >> More
Steady-state kinetic data for monoamine oxidase A in crude extracts suggest an exclusively ping-pong mechanism, in contrast to those for monoamine oxidase B, which indicate alternate mechanisms involving either a binary or ternary complex. In this study, with use of purified monoamine oxidase A, steady-state data for the inhibition by D-amphetamine of the oxidation of primary amines indicate the possibility of a ternary complex mechanism for monoamine oxidase A also. Stopped-flow studies demonstrate that the rate of reoxidation of reduced enzyme is enhanced by substrates but not by the product, 1-methyl-4-phenylpyridinium. Thus, for the A enzyme, the ternary complex with substrate, but not product, is reoxidized at a faster rate than the free, reduced enzyme. For both the A and B forms of monoamine oxidase, the mechanism is determined by competition between alternate pathways on the basis of the relative rate constants and dissociation constants. << Less
Biochemistry 30:4624-4629(1991) [PubMed] [EuropePMC]
This publication is cited by 1 other entry.