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- Name help_outline 4-methyl-2-oxopentanoate Identifier CHEBI:17865 Charge -1 Formula C6H9O3 InChIKeyhelp_outline BKAJNAXTPSGJCU-UHFFFAOYSA-M SMILEShelp_outline CC(C)CC(=O)C([O-])=O 2D coordinates Mol file for the small molecule Search links Involved in 21 reaction(s) Find molecules that contain or resemble this structure Find proteins in UniProtKB for this molecule
- Name help_outline L-kynurenine Identifier CHEBI:57959 Charge 0 Formula C10H12N2O3 InChIKeyhelp_outline YGPSJZOEDVAXAB-QMMMGPOBSA-N SMILEShelp_outline Nc1ccccc1C(=O)C[C@H]([NH3+])C([O-])=O 2D coordinates Mol file for the small molecule Search links Involved in 35 reaction(s) Find molecules that contain or resemble this structure Find proteins in UniProtKB for this molecule
- Name help_outline 4-(2-aminophenyl)-2,4-dioxobutanoate Identifier CHEBI:58147 Charge -1 Formula C10H8NO4 InChIKeyhelp_outline CAOVWYZQMPNAFJ-UHFFFAOYSA-M SMILEShelp_outline Nc1ccccc1C(=O)CC(=O)C([O-])=O 2D coordinates Mol file for the small molecule Search links Involved in 15 reaction(s) Find molecules that contain or resemble this structure Find proteins in UniProtKB for this molecule
- Name help_outline L-leucine Identifier CHEBI:57427 Charge 0 Formula C6H13NO2 InChIKeyhelp_outline ROHFNLRQFUQHCH-YFKPBYRVSA-N SMILEShelp_outline CC(C)C[C@H]([NH3+])C([O-])=O 2D coordinates Mol file for the small molecule Search links Involved in 55 reaction(s) Find molecules that contain or resemble this structure Find proteins in UniProtKB for this molecule
Cross-references
| RHEA:66072 | RHEA:66073 | RHEA:66074 | RHEA:66075 | |
|---|---|---|---|---|
| Reaction direction help_outline | undefined | left-to-right | right-to-left | bidirectional |
| UniProtKB help_outline |
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Publications
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Substrate specificity and structure of human aminoadipate aminotransferase/kynurenine aminotransferase II.
Han Q., Cai T., Tagle D.A., Robinson H., Li J.
KAT (kynurenine aminotransferase) II is a primary enzyme in the brain for catalysing the transamination of kynurenine to KYNA (kynurenic acid). KYNA is the only known endogenous antagonist of the N-methyl-D-aspartate receptor. The enzyme also catalyses the transamination of aminoadipate to alpha-o ... >> More
KAT (kynurenine aminotransferase) II is a primary enzyme in the brain for catalysing the transamination of kynurenine to KYNA (kynurenic acid). KYNA is the only known endogenous antagonist of the N-methyl-D-aspartate receptor. The enzyme also catalyses the transamination of aminoadipate to alpha-oxoadipate; therefore it was initially named AADAT (aminoadipate aminotransferase). As an endotoxin, aminoadipate influences various elements of glutamatergic neurotransmission and kills primary astrocytes in the brain. A number of studies dealing with the biochemical and functional characteristics of this enzyme exist in the literature, but a systematic assessment of KAT II addressing its substrate profile and kinetic properties has not been performed. The present study examines the biochemical and structural characterization of a human KAT II/AADAT. Substrate screening of human KAT II revealed that the enzyme has a very broad substrate specificity, is capable of catalysing the transamination of 16 out of 24 tested amino acids and could utilize all 16 tested alpha-oxo acids as amino-group acceptors. Kinetic analysis of human KAT II demonstrated its catalytic efficiency for individual amino-group donors and acceptors, providing information as to its preferred substrate affinity. Structural analysis of the human KAT II complex with alpha-oxoglutaric acid revealed a conformational change of an N-terminal fraction, residues 15-33, that is able to adapt to different substrate sizes, which provides a structural basis for its broad substrate specificity. << Less
Biosci. Rep. 28:205-215(2008) [PubMed] [EuropePMC]
This publication is cited by 26 other entries.
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Cysteine and keto acids modulate mosquito kynurenine aminotransferase catalyzed kynurenic acid production.
Han Q., Li J.
Kynurenine aminotransferase (KAT) catalyzes the formation of kynurenic acid (KYNA), the natural antagonist of ionotropic glutamate receptors. This study tests potential substrates and assesses the effects of amino acids and keto acids on the activity of mosquito KAT. Various keto acids, when simul ... >> More
Kynurenine aminotransferase (KAT) catalyzes the formation of kynurenic acid (KYNA), the natural antagonist of ionotropic glutamate receptors. This study tests potential substrates and assesses the effects of amino acids and keto acids on the activity of mosquito KAT. Various keto acids, when simultaneously present in the same reaction mixture, display a combined effect on KAT catalyzed KYNA production. Moreover, methionine and glutamine show inhibitory effects on KAT activity, while cysteine functions as either an antagonist or an inhibitor depending on the concentration. Therefore, the overall level of keto acids and cysteine might modulate the KYNA synthesis. Results from this study will be useful in the study of KAT regulation in other animals. << Less
FEBS Lett. 577:381-385(2004) [PubMed] [EuropePMC]
This publication is cited by 28 other entries.
Comments
RHEA:66072 part of RHEA:66068