Enzymes
| UniProtKB help_outline | 1,936 proteins |
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- Name help_outline ATP Identifier CHEBI:30616 (Beilstein: 3581767) help_outline Charge -4 Formula C10H12N5O13P3 InChIKeyhelp_outline ZKHQWZAMYRWXGA-KQYNXXCUSA-J SMILEShelp_outline Nc1ncnc2n(cnc12)[C@@H]1O[C@H](COP([O-])(=O)OP([O-])(=O)OP([O-])([O-])=O)[C@@H](O)[C@H]1O 2D coordinates Mol file for the small molecule Search links Involved in 1,256 reaction(s) Find molecules that contain or resemble this structure Find proteins in UniProtKB for this molecule
- Name help_outline pyridoxine Identifier CHEBI:16709 (Beilstein: 139854; CAS: 65-23-6) help_outline Charge 0 Formula C8H11NO3 InChIKeyhelp_outline LXNHXLLTXMVWPM-UHFFFAOYSA-N SMILEShelp_outline CC1=C(O)C(CO)=C(CO)C=N1 2D coordinates Mol file for the small molecule Search links Involved in 9 reaction(s) Find molecules that contain or resemble this structure Find proteins in UniProtKB for this molecule
- Name help_outline ADP Identifier CHEBI:456216 (Beilstein: 3783669) help_outline Charge -3 Formula C10H12N5O10P2 InChIKeyhelp_outline XTWYTFMLZFPYCI-KQYNXXCUSA-K SMILEShelp_outline Nc1ncnc2n(cnc12)[C@@H]1O[C@H](COP([O-])(=O)OP([O-])([O-])=O)[C@@H](O)[C@H]1O 2D coordinates Mol file for the small molecule Search links Involved in 835 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 pyridoxine 5'-phosphate Identifier CHEBI:58589 Charge -2 Formula C8H10NO6P InChIKeyhelp_outline WHOMFKWHIQZTHY-UHFFFAOYSA-L SMILEShelp_outline Cc1ncc(COP([O-])([O-])=O)c(CO)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
Cross-references
| RHEA:25108 | RHEA:25109 | RHEA:25110 | RHEA:25111 | |
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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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Expression, purification, and kinetic constants for human and Escherichia coli pyridoxal kinases.
di Salvo M.L., Hunt S., Schirch V.
Pyridoxal kinase is an ATP dependent enzyme that phosphorylates pyridoxal, pyridoxine, and pyridoxamine forming their respective 5'-phosphorylated esters. The kinase is a part of the salvage pathway for re-utilizing pyridoxal 5'-phosphate, which serves as a coenzyme for dozens of enzymes involved ... >> More
Pyridoxal kinase is an ATP dependent enzyme that phosphorylates pyridoxal, pyridoxine, and pyridoxamine forming their respective 5'-phosphorylated esters. The kinase is a part of the salvage pathway for re-utilizing pyridoxal 5'-phosphate, which serves as a coenzyme for dozens of enzymes involved in amino acid and sugar metabolism. Clones of two pyridoxal kinases from Escherichia coli and one from human were inserted into a pET 22b plasmid and expressed in E. coli. All three enzymes were purified to near homogeneity and kinetic constants were determined for the three vitamin substrates. Previous studies had suggested that ZnATP was the preferred trinucleotide substrate, but our studies show that under physiological conditions MgATP is the preferred substrate. One of the two E. coli kinases has very low activity for pyridoxal, pyridoxine, and pyridoxamine. We conclude that in vivo this kinase may have an alternate substrate involved in another metabolic pathway and that pyridoxal has only a poor secondary activity for this kinase. << Less
Protein Expr. Purif. 36:300-306(2004) [PubMed] [EuropePMC]
This publication is cited by 2 other entries.
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Identification and function of the pdxY gene, which encodes a novel pyridoxal kinase involved in the salvage pathway of pyridoxal 5'-phosphate biosynthesis in Escherichia coli K-12.
Yang Y., Tsui H.C., Man T.K., Winkler M.E.
pdrK encodes a pyridoxine (PN)/pyridoxal (PL)/pyridoxamine (PM) kinase thought to function in the salvage pathway of pyridoxal 5'-phosphate (PLP) coenzyme biosynthesis. The observation that pdxK null mutants still contain PL kinase activity led to the hypothesis that Escherichia coli K-12 contains ... >> More
pdrK encodes a pyridoxine (PN)/pyridoxal (PL)/pyridoxamine (PM) kinase thought to function in the salvage pathway of pyridoxal 5'-phosphate (PLP) coenzyme biosynthesis. The observation that pdxK null mutants still contain PL kinase activity led to the hypothesis that Escherichia coli K-12 contains at least one other B6-vitamer kinase. Here we support this hypothesis by identifying the pdxY gene (formally, open reading frame f287b) at 36.92 min, which encodes a novel PL kinase. PdxY was first identified by its homology to PdxK in searches of the complete E. coli genome. Minimal clones of pdxY+ overexpressed PL kinase specific activity about 10-fold. We inserted an omega cassette into pdxY and crossed the resulting pdxY::omegaKan(r) mutation into the bacterial chromosome of a pdrB mutant, in which de novo PLP biosynthesis is blocked. We then determined the growth characteristics and PL and PN kinase specific activities in extracts of pdxK and pdxY single and double mutants. Significantly, the requirement of the pdxB pdxK pdxY triple mutant for PLP was not satisfied by PL and PN, and the triple mutant had negligible PL and PN kinase specific activities. Our combined results suggest that the PL kinase PdxY and the PN/PL/PM kinase PdxK are the only physiologically important B6 vitamer kinases in E. coli and that their function is confined to the PLP salvage pathway. Last, we show that pdxY is located downstream from pdxH (encoding PNP/PMP oxidase) and essential tyrS (encoding aminoacyl-tRNA(Tyr) synthetase) in a multifunctional operon. pdxY is completely cotranscribed with tyrS, but about 92% of tyrS transcripts terminate at a putative Rho-factor-dependent attenuator located in the tyrS-pdxY intercistronic region. << Less
J. Bacteriol. 180:1814-1821(1998) [PubMed] [EuropePMC]
This publication is cited by 1 other entry.
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Pyridoxal phosphokinases. I. Assay, distribution, I. Assay, distribution, purification, and properties.
MCCORMICK D.B., GREGORY M.E., SNELL E.E.
J Biol Chem 236:2076-2084(1961) [PubMed] [EuropePMC]
This publication is cited by 2 other entries.