The Enzyme Database

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EC 4.2.1.79     
Accepted name: 2-methylcitrate dehydratase
Reaction: (2S,3S)-2-hydroxybutane-1,2,3-tricarboxylate = (Z)-but-2-ene-1,2,3-tricarboxylate + H2O
Glossary: (2S,3S)-2-methylcitrate = (2S,3S)-2-hydroxybutane-1,2,3-tricarboxylate
cis-2-methylaconitate = (Z)-but-2-ene-1,2,3-tricarboxylate
Other name(s): 2-methylcitrate hydro-lyase; PrpD; 2-hydroxybutane-1,2,3-tricarboxylate hydro-lyase
Systematic name: (2S,3S)-2-hydroxybutane-1,2,3-tricarboxylate hydro-lyase [(Z)-but-2-ene-1,2,3-tricarboxylate-forming]
Comments: The enzyme is specific for (2S,3S)-methylcitrate, showing no activity with (2R,3S)-methylcitrate [2]. The enzyme can also use cis-aconitate as a substrate but more slowly [2]. Both this enzyme and EC 4.2.1.3, aconitate hydratase, are required to complete the isomerization of (2S,3S)-methylcitrate to (2R,3S)-2-methylisocitrate [2].
Links to other databases: BRENDA, EXPASY, KEGG, MetaCyc, PDB, CAS registry number: 80891-26-5
References:
1.  Aoki, H. and Tabuchi, T. Purification and properties of 2-methylcitrate dehydratase from Yarrowia lipolytica. Agric. Biol. Chem. 45 (1981) 2831–2837.
2.  Brock, M., Maerker, C., Schütz, A., Völker, U. and Buckel, W. Oxidation of propionate to pyruvate in Escherichia coli. Involvement of methylcitrate dehydratase and aconitase. Eur. J. Biochem. 269 (2002) 6184–6194. [DOI] [PMID: 12473114]
[EC 4.2.1.79 created 1984]
 
 
EC 4.2.1.117     
Accepted name: 2-methylcitrate dehydratase (2-methyl-trans-aconitate forming)
Reaction: (2S,3S)-2-methylcitrate = 2-methyl-trans-aconitate + H2O
Glossary: (2S,3S)-2-methylcitrate = (2S,3S)-2-hydroxybutane-1,2,3-tricarboxylate
2-methyl-trans-aconitate = (2E)-but-2-ene-1,2,3-tricarboxylate
Systematic name: (2S,3S)-2-hydroxybutane-1,2,3-tricarboxylate hydro-lyase (2-methyl-trans-aconitate-forming)
Comments: Catalyses the dehydration of (2S,3S)-2-methylcitrate, forming the trans isomer of 2-methyl-aconitate (unlike EC 4.2.1.79, which forms only the cis isomer). Part of a propionate degradation pathway. The enzyme from Shewanella oneidensis can also accept citrate and cis-aconitate, but activity with (2S,3S)-2-methylcitrate was approximately 2.5-fold higher. 2-methylisocitrate and isocitrate were not substrates [1]. An iron-sulfur protein.
Links to other databases: BRENDA, EXPASY, KEGG, MetaCyc
References:
1.  Grimek, T.L. and Escalante-Semerena, J.C. The acnD genes of Shewenella oneidensis and Vibrio cholerae encode a new Fe/S-dependent 2-methylcitrate dehydratase enzyme that requires prpF function in vivo. J. Bacteriol. 186 (2004) 454–462. [DOI] [PMID: 14702315]
[EC 4.2.1.117 created 2009]
 
 


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