ExplorEnz: EC 1.1.1.203

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1.1.1.203

Accepted name:

uronate dehydrogenase

Reaction:

(1) β-D-galacturonate + NAD⁺ = D-galactaro-1,5-lactone + NADH + H⁺
(2) β-D-glucuronate + NAD⁺ = D-glucaro-1,5-lactone + NADH + H⁺

Other name(s):

uronate:NAD-oxidoreductase; uronic acid dehydrogenase

Systematic name:

uronate:NAD⁺ 1-oxidoreductase

Comments:

Requires Mg²⁺. The enzyme, characterized from the bacterium Agrobacterium fabrum, participates in oxidative degradation pathways for galacturonate and glucuronate. The enzyme can only accept the β anomeric form of the substrate [4]. The 1,5-lactone product is rather stable at cytosolic pH and does not hydrolyse spontaneously at a substantial rate.

Links to other databases:

BRENDA, EXPASY, Gene, KEGG, MetaCyc, PDB, CAS registry number: 37250-98-9

References:

1.	Kilgore, W.W. and Starr, M.P. Uronate oxidation by phytopathogenic pseudomonads. Nature (Lond.) 183 (1959) 1412–1413. [PMID: 13657147]
2.	Boer, H., Maaheimo, H., Koivula, A., Penttila, M. and Richard, P. Identification in Agrobacterium tumefaciens of the D-galacturonic acid dehydrogenase gene. Appl. Microbiol. Biotechnol. 86 (2010) 901–909. [DOI] [PMID: 19921179]
3.	Andberg, M., Maaheimo, H., Boer, H., Penttila, M., Koivula, A. and Richard, P. Characterization of a novel Agrobacterium tumefaciens galactarolactone cycloisomerase enzyme for direct conversion of D-galactarolactone to 3-deoxy-2-keto-L-threo-hexarate. J. Biol. Chem. 287 (2012) 17662–17671. [DOI] [PMID: 22493433]
4.	Parkkinen, T., Boer, H., Janis, J., Andberg, M., Penttila, M., Koivula, A. and Rouvinen, J. Crystal structure of uronate dehydrogenase from Agrobacterium tumefaciens. J. Biol. Chem. 286 (2011) 27294–27300. [DOI] [PMID: 21676870]

[EC 1.1.1.203 created 1972 as EC 1.2.1.35, transferred 1984 to EC 1.1.1.203, modified 2014]