IUBMB Enzyme Nomenclature


Accepted name: UDP-glucuronic acid dehydrogenase (UDP-4-keto-hexauronic acid decarboxylating)

Reaction: UDP-glucuronate + NAD+ = UDP-β-L-threo-pentapyranos-4-ulose + CO2 + NADH + H+

For diagram of reaction click here.

Other name(s): UDP-GlcUA decarboxylase; ArnADH

Systematic name: UDP-glucuronate:NAD+ oxidoreductase (decarboxylating)

Comments: The activity is part of a bifunctional enzyme also performing the reaction of EC (UDP-4-amino-4-deoxy-L-arabinose formyltransferase).

Links to other databases: BRENDA, EXPASY, KEGG, Metacyc, PDB, CAS registry number:


1. Breazeale, S.D., Ribeiro, A.A., McClerren, A.L. and Raetz, C.R.H. A formyltransferase required for polymyxin resistance in Escherichia coli and the modification of lipid A with 4-amino-4-deoxy-L-arabinose. Identification and function of UDP-4-deoxy-4-formamido-L-arabinose. J. Biol. Chem. 280 (2005) 14154-14167. [PMID: 15695810]

2. Gatzeva-Topalova, P.Z., May, A.P. and Sousa, M.C. Crystal structure of Escherichia coli ArnA (PmrI) decarboxylase domain. A key enzyme for lipid A modification with 4-amino-4-deoxy-L-arabinose and polymyxin resistance. Biochemistry 43 (2004) 13370-13379. [PMID: 15491143]

3. Williams, G.J., Breazeale, S.D., Raetz, C.R.H. and Naismith, J.H. Structure and function of both domains of ArnA, a dual function decarboxylase and a formyltransferase, involved in 4-amino-4-deoxy-L-arabinose biosynthesis. J. Biol. Chem. 280 (2005) 23000-23008. [PMID: 15809294]

4. Gatzeva-Topalova, P.Z., May, A.P. and Sousa, M.C. Structure and mechanism of ArnA: conformational change implies ordered dehydrogenase mechanism in key enzyme for polymyxin resistance. Structure 13 (2005) 929-942. [PMID: 15939024]

5. Yan, A., Guan, Z. and Raetz, C.R.H. An undecaprenyl phosphate-aminoarabinose flippase required for polymyxin resistance in Escherichia coli. J. Biol. Chem. 282 (2007) 36077-36089. [PMID: 17928292]

[EC created 2010]

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