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- Name help_outline 4-pyridoxolactone Identifier CHEBI:16871 (Beilstein: 140752; CAS: 4753-19-9) help_outline Charge 0 Formula C8H7NO3 InChIKeyhelp_outline HHPDVQLBYQFYFA-UHFFFAOYSA-N SMILEShelp_outline Cc1ncc2COC(=O)c2c1O 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 H2O Identifier CHEBI:15377 (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 6,264 reaction(s) Find molecules that contain or resemble this structure Find proteins in UniProtKB for this molecule
- Name help_outline 4-pyridoxate Identifier CHEBI:30959 Charge -1 Formula C8H8NO4 InChIKeyhelp_outline HXACOUQIXZGNBF-UHFFFAOYSA-M SMILEShelp_outline Cc1ncc(CO)c(C([O-])=O)c1O 2D coordinates Mol file for the small molecule Search links Involved in 4 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 9,521 reaction(s) Find molecules that contain or resemble this structure Find proteins in UniProtKB for this molecule
Cross-references
| RHEA:14301 | RHEA:14302 | RHEA:14303 | RHEA:14304 | |
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| Reaction direction help_outline | undefined | left-to-right | right-to-left | bidirectional |
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Publications
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Structure of 4-pyridoxolactonase from Mesorhizobium loti.
Kobayashi J., Yoshikane Y., Yagi T., Baba S., Mizutani K., Takahashi N., Mikami B.
4-Pyridoxolactonase from Mesorhizobium loti catalyzes the zinc-dependent lactone-ring hydrolysis of 4-pyridoxolactone (4PAL) to 4-pyridoxic acid (4PA) in vitamin B6 degradation pathway I. The crystal structures of 4-pyridoxolactonase and its complex with 5-pyridoxolactone (5PAL; the competitive in ... >> More
4-Pyridoxolactonase from Mesorhizobium loti catalyzes the zinc-dependent lactone-ring hydrolysis of 4-pyridoxolactone (4PAL) to 4-pyridoxic acid (4PA) in vitamin B6 degradation pathway I. The crystal structures of 4-pyridoxolactonase and its complex with 5-pyridoxolactone (5PAL; the competitive inhibitor) were determined. The overall structure was an αβ/βα sandwich fold, and two zinc ions were coordinated. This strongly suggested that the enzyme belongs to subclass B3 of the class B β-lactamases. In the complex structure, the carbonyl group of 5PAL pointed away from the active site, revealing why it acts as a competitive inhibitor. Based on docking simulation with 4PAL, 4PA and a reaction intermediate, 4-pyridoxolactonase probably catalyzes the reaction through a subclass B2-like mechanism, not the subclass B3 mechanism. << Less
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4-Pyridoxolactonase from a symbiotic nitrogen-fixing bacterium Mesorhizobium loti: cloning, expression, and characterization.
Funami J., Yoshikane Y., Kobayashi H., Yokochi N., Yuan B., Iwasaki K., Ohnishi K., Yagi T.
4-Pyridoxolactonase is involved in the degradation pathway for pyridoxine, a free form of vitamin B6. The gene (mlr6805) encoding the putative 4-pyridoxolactonase of nitrogen fixing symbiotic microorganism Mesorhizobium loti MAFF303099 has been identified based on the genome database. The gene was ... >> More
4-Pyridoxolactonase is involved in the degradation pathway for pyridoxine, a free form of vitamin B6. The gene (mlr6805) encoding the putative 4-pyridoxolactonase of nitrogen fixing symbiotic microorganism Mesorhizobium loti MAFF303099 has been identified based on the genome database. The gene was cloned and overexpressed in a cotransformant Escherichia coli cell. The recombinant enzyme was dimeric protein and contained one mole of Zn2+ per mole of subunit. The enzyme showed about 30% identity with various N-acylhomoserine lactone lactonases and metallo-beta-lactamases. The phylogram made with ClustalW shows that 4-pyridoxolactonase makes a cluster with Agrobacterium tumefaciens acyl-homoserine lactone lactonase. The alignment of amino acid sequences suggests that 4-pyridoxolactonase has three histidine residues probably involved in binding of Zn2+. << Less
Biochim. Biophys. Acta 1753:234-239(2005) [PubMed] [EuropePMC]