Glucuronidation (Mus musculus)

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21Uridine diphosphate glucuronic acid synthesis (co-substrate)UgdhUridine 5'-diphosphatePgm1Pgm2UGTPGM5NADHGlucose 6-phosphatePhosphate2H+NADAdenosine 3',5'-diphosphateAdenosine triphosphateUgp2Pgm3substrate-glucuronideGlucose 1-phosphateD-GlucoseUridine diphosphate glucoseHk1Uridine diphosphate glucuronic acidUridine triphosphatePhosphateSubstrateWaterUGT2B17Ugt1a5Ugt1a8Ugt2a3UGT1A6UGT2B15Ugt2b1Ugt2b34Ugt1a10Ugt1a5Ugt2a1Ugt1a1Ugt1a9UGT2B28Ugt2a2UGT2B7UGT2B11Ugt1a2UGT1A7


Metabolism of xenobiotic compounds consists of phase I and a phase II biotransformation reactions, being compound modification and conjugation reactions respectively. In phase I biotransformation, the compound is modificated via oxidation, reduction, hydrolysis, or other minor reactions, to reveal a reactive group to which a conjugation molecule can react to. In phase II, a small conjugation molecule reacts with the phase I modified molecule, producing a much more water-soluble molecule that can be excreted more easily. Glucuronidation is a phase II biotransformation reaction in which glucuronide acts as a conjugation molecule and binds to a substrate via the catalysis of glucuronosyltransferases. First, in a series of reactions the cosubstrate uridine diphosphate glucuronic acid (UDPGA) is formed. The glucuronosyltransferases (UGTs) then catalyze the transfer of glucuronic acid from UDPGA to a substrate resulting in a glucuronidated substrate and leaving uridine 5'-diphosphate. UGTs are a very broad and divers group of enzymes and count as the most significant group of conjugation enzymes in xenobiotic metabolism, qualitatively because glucuronic acid can be coupled to a large diversity of functional groups and quantitatively because of the large and divers number of substrates that are formed.


This pathway was inferred from Homo sapiens pathway WP698(r30281) with a 51% conversion rate.

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Ontology Terms



  1. Wei Q, Galbenus R, Raza A, Cerny RL, Simpson MA; ''Androgen-stimulated UDP-glucose dehydrogenase expression limits prostate androgen availability without impacting hyaluronan levels.''; Cancer Res, 2009 PubMed Europe PMC Scholia
  2. Testa B, Kramer SD; ''The biochemistry of drug metabolism--an introduction: part 4. reactions of conjugation and their enzymes.''; Chem Biodivers, 2008 PubMed Europe PMC Scholia


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106835view13:31, 17 September 2019MaintBotHMDB identifier normalization
79223view13:49, 15 March 2015EgonwReplaced the HMDB H2 identifier with H+ from ChEBI.
69090view18:11, 8 July 2013MaintBotUpdated to 2013 gpml schema
67288view10:32, 26 June 2013Christine ChichesterOntology Term : 'glucuronidation conjugation pathway' added !
59029view20:41, 21 February 2013MaintBotUpdated Ensembl and UniProt data source
41277view00:21, 2 March 2011MaintBotRemoved redundant pathway information and comments
34382view22:48, 9 December 2009MaintBotAutomatic update of empty xrefs
32955view19:21, 28 September 2009MaintBotAdded xrefs
32749view23:29, 3 September 2009MaintBotModified categories
31846view12:31, 14 August 2009MaintBotFixed group labels
30814view23:56, 29 July 2009MaintBotNew pathway

External references


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NameTypeDatabase referenceComment
2H+MetaboliteCHEBI:15378 (ChEBI)
Adenosine 3',5'-diphosphateMetaboliteHMDB0000061 (HMDB)
Adenosine triphosphateMetaboliteHMDB0000538 (HMDB)
D-GlucoseMetaboliteHMDB0000122 (HMDB)
Glucose 1-phosphateMetaboliteHMDB0001586 (HMDB)
Glucose 6-phosphateMetaboliteHMDB0001401 (HMDB)
Hk1GeneProductENSMUSG00000037012 (Ensembl)
NADHMetaboliteHMDB0001487 (HMDB)
NADMetaboliteHMDB0000902 (HMDB)
PGM5GeneProduct226041 (Entrez Gene)
Pgm1GeneProductENSMUSG00000029171 (Ensembl)
Pgm2GeneProductENSMUSG00000025791 (Ensembl)
Pgm3GeneProductENSMUSG00000056131 (Ensembl)
PhosphateMetaboliteHMDB0001429 (HMDB)
UgdhGeneProductENSMUSG00000029201 (Ensembl)
Ugp2GeneProductENSMUSG00000001891 (Ensembl)
Ugt1a10GeneProduct394430 (Entrez Gene)
Ugt1a1GeneProduct394436 (Entrez Gene)
Ugt1a2GeneProduct22236 (Entrez Gene)
Ugt1a5GeneProduct394433 (Entrez Gene)
Ugt1a8GeneProductMGI:3576090 (MGI)
Ugt1a9GeneProduct434493 (Entrez Gene)
Ugt2a1GeneProduct94215 (Entrez Gene)
Ugt2a2GeneProduct552899 (Entrez Gene)
Ugt2a3GeneProduct72094 (Entrez Gene)
Ugt2b1GeneProduct71773 (Entrez Gene)
Ugt2b34GeneProduct100727 (Entrez Gene)
Uridine 5'-diphosphateMetaboliteHMDB0000295 (HMDB)
Uridine diphosphate glucoseMetaboliteHMDB0000286 (HMDB)
Uridine diphosphate glucuronic acidMetaboliteHMDB0000935 (HMDB)
Uridine triphosphateMetaboliteHMDB0000285 (HMDB)
WaterMetaboliteHMDB0002111 (HMDB)

Annotated Interactions

No annotated interactions
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