Record Information
Version1.0
Creation Date2016-09-30 22:34:52 UTC
Update Date2020-06-04 20:08:18 UTC
BMDB IDBMDB0000684
Secondary Accession Numbers
  • BMDB00684
Metabolite Identification
Common NameL-Kynurenine
DescriptionL-Kynurenine, also known as quinurenine, belongs to the class of organic compounds known as alkyl-phenylketones. These are aromatic compounds containing a ketone substituted by one alkyl group, and a phenyl group. L-Kynurenine exists as a solid, possibly soluble (in water), and a very strong basic compound (based on its pKa) molecule. L-Kynurenine exists in all eukaryotes, ranging from yeast to humans. L-Kynurenine participates in a number of enzymatic reactions, within cattle. In particular, L-Kynurenine and formic acid can be biosynthesized from n'-formylkynurenine; which is mediated by the enzyme kynurenine formamidase. In addition, L-Kynurenine can be converted into 2-aminobenzoic acid and L-alanine through the action of the enzyme kynureninase. In cattle, L-kynurenine is involved in the metabolic pathway called the tryptophan metabolism pathway.
Structure
Thumb
Synonyms
ValueSource
(2S)-2-Amino-4-(2-aminophenyl)-4-oxobutanoic acidChEBI
3-Anthraniloyl-L-alanineChEBI
KYNURENINEChEBI
(2S)-2-Amino-4-(2-aminophenyl)-4-oxobutanoateGenerator
(S)-alpha,2-Diamino-3-hydroxy-gamma-oxo-benzenebutanoateHMDB
(S)-alpha,2-Diamino-3-hydroxy-gamma-oxo-benzenebutanoic acidHMDB
3-Anthraniloyl-alanineHMDB
3-AnthraniloylalanineHMDB
alpha,2-Diamino-gamma-oxo-benzenebutanoateHMDB
alpha,2-Diamino-gamma-oxo-benzenebutanoic acidHMDB
DL-KynurenineHMDB
KynureninHMDB
QuinurenineHMDB
L-KynurenineHMDB
3-(2-aminobenzoyl)-L-alanineHMDB
KYNAHMDB
Chemical FormulaC10H12N2O3
Average Molecular Weight208.2139
Monoisotopic Molecular Weight208.08479226
IUPAC Name(2S)-2-amino-4-(2-aminophenyl)-4-oxobutanoic acid
Traditional NameL-kynurenine
CAS Registry Number2922-83-0
SMILES
N[C@@H](CC(=O)C1=CC=CC=C1N)C(O)=O
InChI Identifier
InChI=1S/C10H12N2O3/c11-7-4-2-1-3-6(7)9(13)5-8(12)10(14)15/h1-4,8H,5,11-12H2,(H,14,15)/t8-/m0/s1
InChI KeyYGPSJZOEDVAXAB-QMMMGPOBSA-N
Chemical Taxonomy
Description belongs to the class of organic compounds known as alkyl-phenylketones. These are aromatic compounds containing a ketone substituted by one alkyl group, and a phenyl group.
KingdomOrganic compounds
Super ClassOrganic oxygen compounds
ClassOrganooxygen compounds
Sub ClassCarbonyl compounds
Direct ParentAlkyl-phenylketones
Alternative Parents
Substituents
  • Alkyl-phenylketone
  • Butyrophenone
  • Alpha-amino acid
  • Alpha-amino acid or derivatives
  • L-alpha-amino acid
  • Benzoyl
  • Gamma-keto acid
  • Aniline or substituted anilines
  • Aryl alkyl ketone
  • Monocyclic benzene moiety
  • Beta-aminoketone
  • Keto acid
  • Benzenoid
  • Vinylogous amide
  • Amino acid
  • Amino acid or derivatives
  • Monocarboxylic acid or derivatives
  • Carboxylic acid
  • Carboxylic acid derivative
  • Primary aliphatic amine
  • Amine
  • Hydrocarbon derivative
  • Organopnictogen compound
  • Organic oxide
  • Organic nitrogen compound
  • Organonitrogen compound
  • Primary amine
  • Aromatic homomonocyclic compound
Molecular FrameworkAromatic homomonocyclic compounds
External Descriptors
Ontology
StatusDetected and Quantified
Origin
  • Endogenous
BiofunctionNot Available
ApplicationNot Available
Cellular locations
  • Cytoplasm
  • Mitochondria
Physical Properties
StateSolid
Experimental Properties
PropertyValueReference
Melting Point191 °CNot Available
Boiling PointNot AvailableNot Available
Water SolubilityNot AvailableNot Available
LogPNot AvailableNot Available
Predicted Properties
PropertyValueSource
logP-1.9ALOGPS
logP-1.9ChemAxon
logS-2.1ALOGPS
pKa (Strongest Acidic)1.19ChemAxon
pKa (Strongest Basic)8.96ChemAxon
Physiological Charge0ChemAxon
Hydrogen Acceptor Count5ChemAxon
Hydrogen Donor Count3ChemAxon
Polar Surface Area106.41 ŲChemAxon
Rotatable Bond Count4ChemAxon
Refractivity55.05 m³·mol⁻¹ChemAxon
Polarizability20.59 ųChemAxon
Number of Rings1ChemAxon
BioavailabilityYesChemAxon
Rule of FiveYesChemAxon
Ghose FilterYesChemAxon
Veber's RuleYesChemAxon
MDDR-like RuleYesChemAxon
Spectra
Spectra
Biological Properties
Cellular Locations
  • Cytoplasm
  • Mitochondria
Biospecimen Locations
  • Blood
  • Brain
  • Epidermis
  • Fibroblasts
  • Intestine
  • Liver
  • Longissimus Thoracis Muscle
  • Milk
  • Neuron
  • Placenta
  • Ruminal Fluid
  • Semimembranosus Muscle
  • Spleen
  • Testis
Pathways
Normal Concentrations
BiospecimenStatusValueAgeSexConditionReferenceDetails
BloodDetected and Quantified0.5-2 uMNot SpecifiedNot Specified
Normal
details
BloodDetected and Quantified7 +/- 2 uMNot SpecifiedNot Specified
Normal
    • Aidin Foroutan, C...
details
BloodDetected and Quantified3.9-7 uMNot SpecifiedNot Specified
Normal
details
BrainExpected but not QuantifiedNot QuantifiedNot SpecifiedNot SpecifiedNormal
  • Not Applicable
details
EpidermisExpected but not QuantifiedNot QuantifiedNot SpecifiedNot SpecifiedNormal
  • Not Applicable
details
FibroblastsExpected but not QuantifiedNot QuantifiedNot SpecifiedNot SpecifiedNormal
  • Not Applicable
details
IntestineExpected but not QuantifiedNot QuantifiedNot SpecifiedNot SpecifiedNormal
  • Not Applicable
details
LiverDetected but not QuantifiedNot QuantifiedNot SpecifiedNot Specified
Normal
details
LiverDetected and Quantified3 +/- 2 nmol/g of tissueNot SpecifiedNot Specified
Normal
    • Aidin Foroutan, C...
details
Longissimus Thoracis MuscleDetected and Quantified0.6 +/- 0.2 nmol/g of tissueNot SpecifiedNot Specified
Normal
    • Aidin Foroutan, C...
details
MilkDetected but not QuantifiedNot QuantifiedNot SpecifiedNot Specified
Normal
details
MilkDetected but not QuantifiedNot QuantifiedNot SpecifiedNot Specified
Normal
details
NeuronExpected but not QuantifiedNot QuantifiedNot SpecifiedNot SpecifiedNormal
  • Not Applicable
details
PlacentaExpected but not QuantifiedNot QuantifiedNot SpecifiedNot SpecifiedNormal
  • Not Applicable
details
Ruminal FluidDetected and Quantified20.2 +/- 0.03 uMNot SpecifiedNot SpecifiedNormal
    • Fozia Saleem, Sou...
details
Ruminal FluidDetected and Quantified20.23 +/- 0.03 uMNot SpecifiedNot Specified
Normal
    • Fozia Saleem, Sou...
details
Semimembranosus MuscleDetected and Quantified0.5 +/- 0.2 nmol/g of tissueNot SpecifiedNot Specified
Normal
    • Aidin Foroutan, C...
details
SpleenExpected but not QuantifiedNot QuantifiedNot SpecifiedNot SpecifiedNormal
  • Not Applicable
details
TestisDetected and Quantified0.9 +/- 0.4 nmol/g of tissueNot SpecifiedNot Specified
Normal
    • Aidin Foroutan, C...
details
Abnormal Concentrations
Not Available
HMDB IDHMDB0000684
DrugBank IDDB02070
Phenol Explorer Compound IDNot Available
FooDB IDFDB022181
KNApSAcK IDC00007604
Chemspider ID141580
KEGG Compound IDC00328
BioCyc IDCPD-14736
BiGG ID1445574
Wikipedia LinkKynurenine
METLIN ID72
PubChem Compound161166
PDB IDNot Available
ChEBI ID16946
References
Synthesis ReferenceHayaishi, Osamu. L-Kynurenine sulfate monohydrate. Biochemical Preparations (1953), 3 108-11.
Material Safety Data Sheet (MSDS)Not Available
General References
  1. Melzer N, Wittenburg D, Hartwig S, Jakubowski S, Kesting U, Willmitzer L, Lisec J, Reinsch N, Repsilber D: Investigating associations between milk metabolite profiles and milk traits of Holstein cows. J Dairy Sci. 2013 Mar;96(3):1521-34. doi: 10.3168/jds.2012-5743. [PubMed:23438684 ]
  2. Mung D, Li L: Development of Chemical Isotope Labeling LC-MS for Milk Metabolomics: Comprehensive and Quantitative Profiling of the Amine/Phenol Submetabolome. Anal Chem. 2017 Apr 18;89(8):4435-4443. doi: 10.1021/acs.analchem.6b03737. Epub 2017 Mar 28. [PubMed:28306241 ]
  3. Mung D, Li L: Applying quantitative metabolomics based on chemical isotope labeling LC-MS for detecting potential milk adulterant in human milk. Anal Chim Acta. 2018 Feb 25;1001:78-85. doi: 10.1016/j.aca.2017.11.019. Epub 2017 Nov 14. [PubMed:29291809 ]

Enzymes

General function:
Transcription
Specific function:
Transaminase with broad substrate specificity. Has transaminase activity towards aminoadipate, kynurenine, methionine and glutamate. Shows activity also towards tryptophan, aspartate and hydroxykynurenine. Accepts a variety of oxo-acids as amino-group acceptors, with a preference for 2-oxoglutarate, 2-oxocaproic acid, phenylpyruvate and alpha-oxo-gamma-methiol butyric acid. Can also use glyoxylate as amino-group acceptor (in vitro) (By similarity).
Gene Name:
AADAT
Uniprot ID:
Q5E9N4
Molecular weight:
47901.0
Reactions
L-Kynurenine + Oxoglutaric acid → 4-(2-Aminophenyl)-2,4-dioxobutanoic acid + L-Glutamic aciddetails
General function:
Amino acid transport and metabolism
Specific function:
Catalyzes the irreversible transamination of the L-tryptophan metabolite L-kynurenine to form kynurenic acid (KA). May catalyze the beta-elimination of S-conjugates and Se-conjugates of L-(seleno)cysteine, resulting in the cleavage of the C-S or C-Se bond (By similarity). Has transaminase activity towards L-kynurenine, tryptophan, phenylalanine, serine, cysteine, methionine, histidine, glutamine and asparagine with glyoxylate as an amino group acceptor (in vitro). Has lower activity with 2-oxoglutarate as amino group acceptor (in vitro) (By similarity).
Gene Name:
KYAT3
Uniprot ID:
Q0P5G4
Molecular weight:
51472.0
General function:
Not Available
Specific function:
Catalyzes the cleavage of L-kynurenine (L-Kyn) and L-3-hydroxykynurenine (L-3OHKyn) into anthranilic acid (AA) and 3-hydroxyanthranilic acid (3-OHAA), respectively. Has a preference for the L-3-hydroxy form. Also has cysteine-conjugate-beta-lyase activity.
Gene Name:
KYNU
Uniprot ID:
F1MCH2
Molecular weight:
52186.0
Reactions
L-Kynurenine + Water → 2-Aminobenzoic acid + L-Alaninedetails
General function:
Not Available
Specific function:
Catalyzes the hydrolysis of N-formyl-L-kynurenine to L-kynurenine, the second step in the kynurenine pathway of tryptophan degradation. Kynurenine may be further oxidized to nicotinic acid, NAD(H) and NADP(H). Required for elimination of toxic metabolites.
Gene Name:
AFMID
Uniprot ID:
E1BLL5
Molecular weight:
35460.0
Reactions
N'-Formylkynurenine + Water → L-Kynurenine + Formic aciddetails
General function:
Not Available
Specific function:
Not Available
Gene Name:
KMO
Uniprot ID:
E1BN59
Molecular weight:
51032.0
Reactions
L-Kynurenine + NADPH + Oxygen → L-3-Hydroxykynurenine + NADP + Waterdetails