Enzymes
| Enzyme class help_outline |
|
Reaction participants Show >> << Hide
- Name help_outline isopyridoxal Identifier CHEBI:17889 (CAS: 66-72-8) help_outline Charge 0 Formula C8H9NO3 InChIKeyhelp_outline GNKXHPULSPWUAK-UHFFFAOYSA-N SMILEShelp_outline Cc1ncc(C=O)c(CO)c1O 2D coordinates Mol file for the small molecule Search links Involved in 3 reaction(s) Find molecules that contain or resemble this structure Find proteins in UniProtKB for this molecule
- Name help_outline NAD+ Identifier CHEBI:57540 (Beilstein: 3868403) help_outline Charge -1 Formula C21H26N7O14P2 InChIKeyhelp_outline BAWFJGJZGIEFAR-NNYOXOHSSA-M SMILEShelp_outline NC(=O)c1ccc[n+](c1)[C@@H]1O[C@H](COP([O-])(=O)OP([O-])(=O)OC[C@H]2O[C@H]([C@H](O)[C@@H]2O)n2cnc3c(N)ncnc23)[C@@H](O)[C@H]1O 2D coordinates Mol file for the small molecule Search links Involved in 1,142 reaction(s) Find molecules that contain or resemble this structure Find proteins in UniProtKB for this molecule
- Name help_outline 5-pyridoxolactone Identifier CHEBI:2124 (Beilstein: 140335; CAS: 4543-56-0) help_outline Charge 0 Formula C8H7NO3 InChIKeyhelp_outline PPAXBSPBIWBREI-UHFFFAOYSA-N SMILEShelp_outline Cc1ncc2C(=O)OCc2c1O 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 H+ Identifier CHEBI:15378 Charge 1 Formula H InChIKeyhelp_outline GPRLSGONYQIRFK-UHFFFAOYSA-N SMILEShelp_outline [H+] 2D coordinates Mol file for the small molecule Search links Involved in 9,176 reaction(s) Find molecules that contain or resemble this structure Find proteins in UniProtKB for this molecule
- Name help_outline NADH Identifier CHEBI:57945 (Beilstein: 3869564) help_outline Charge -2 Formula C21H27N7O14P2 InChIKeyhelp_outline BOPGDPNILDQYTO-NNYOXOHSSA-L SMILEShelp_outline NC(=O)C1=CN(C=CC1)[C@@H]1O[C@H](COP([O-])(=O)OP([O-])(=O)OC[C@H]2O[C@H]([C@H](O)[C@@H]2O)n2cnc3c(N)ncnc23)[C@@H](O)[C@H]1O 2D coordinates Mol file for the small molecule Search links Involved in 1,073 reaction(s) Find molecules that contain or resemble this structure Find proteins in UniProtKB for this molecule
Cross-references
| RHEA:51588 | RHEA:51589 | RHEA:51590 | RHEA:51591 | |
|---|---|---|---|---|
| Reaction direction help_outline | undefined | left-to-right | right-to-left | bidirectional |
| UniProtKB help_outline |
|
|||
| EC numbers help_outline | ||||
| MetaCyc help_outline |
Publications
-
Enzymes of vitamin B6 degradation. Purification and properties of isopyridoxal dehydrogenase and 5-formyl-3-hydroxy-2-methylpyridine-4-carboxylic-acid dehydrogenase.
Lee Y.C., Nelson M.J., Snell E.E.
Two NAD+-dependent, highly specific pyridine-5-aldehyde dehydrogenases, 5-formyl-3-hydroxy-2-methylpyridine-4-carboxylic-acid (Compound 1) dehydrogenase and isopyridoxal dehydrogenase, were purified to homogeneity from Pseudomonas MA-1 and Arthrobacter Cr-7, respectively. Both enzymes are induced ... >> More
Two NAD+-dependent, highly specific pyridine-5-aldehyde dehydrogenases, 5-formyl-3-hydroxy-2-methylpyridine-4-carboxylic-acid (Compound 1) dehydrogenase and isopyridoxal dehydrogenase, were purified to homogeneity from Pseudomonas MA-1 and Arthrobacter Cr-7, respectively. Both enzymes are induced in response to growth of the organisms on pyridoxine and catalyze steps in the degradation of this compound by these organisms. Compound 1 dehydrogenase (Mr = 65,000) contains two subunits of equal size with methionine as the NH2-terminal amino acid and acts optimally at pH 7.8-8.5. It catalyzes with equal facility (turnover number = 400-670 s-1 molecule-1) both the oxidation of Compound 1 (Km = 65 microM) by NAD+ (Km = 25 microM) to 3-hydroxy-2-methylpyridine-4,5-dicarboxylic acid and the reduction of Compound 1 by NADH (Km = 20 microM) to 4-pyridoxic acid and appears to act as a true dismutase. The possible advantage to the organism of its ability to act as a dismutase is discussed briefly. No oxidation of 4-pyridoxic acid by this enzyme was observed. Isopyridoxal dehydrogenase (Mr = 242,000) contains four subunits of equal size, again with methionine at the NH2 terminus. At its optimal pH of 8.0-8.6, it catalyzes the oxidation of isopyridoxal (Km = 40 microM, turnover number = 10 s-1 molecule-1) by NAD+ (Km = 40 microM) to a mixture of 5-pyridoxic acid and 5-pyridoxolactone, which are produced in constant ratio throughout the course of the reaction. Formation of the two products, although unusual, is readily understandable in terms of the structure of isopyridoxal in solution or the structure of a possible acyl-enzyme intermediate in the oxidative reaction. << Less
J Biol Chem 261:15106-15111(1986) [PubMed] [EuropePMC]
This publication is cited by 2 other entries.