IUBMB Enzyme Nomenclature


Accepted name: citrate (Si)-synthase

Reaction: acetyl-CoA + H2O + oxaloacetate = citrate + CoA

For diagram of reaction click here or click here.

Other name(s): (R)-citric synthase; citrate oxaloacetate-lyase [(pro-3S)-CH2COO-→acetyl-CoA]

Systematic name: acetyl-CoA:oxaloacetate C-acetyltransferase [thioester-hydrolysing, (pro-S)-carboxymethyl forming]

Comments: The stereospecificity of this enzyme is opposite to that of EC, citrate (Re)-synthase, which is found in some anaerobes. Citrate synthase for which the stereospecificity with respect to C-2 of oxaloacetate has not been established are included in EC, citrate synthase.

Links to other databases: BRENDA, EXPASY, GTD, KEGG, MetaCyc, PDB, CAS registry number: 9027-96-7


1. Lenz, H., Buckel, W., Wunderwald, P., Biedermann, G., Buschmeier, V., Eggerer, H., Cornforth, J.W., Redmond, J.W. and Mallaby, R. Stereochemistry of si-citrate synthase and ATP-citrate-lyase reactions. Eur. J. Biochem. 24 (1971) 207-215. [PMID: 5157292]

2. Karpusas, M., Branchaud, B. and Remington, S.J. Proposed mechanism for the condensation reaction of citrate synthase: 1.9-Å structure of the ternary complex with oxaloacetate and carboxymethyl coenzyme A. Biochemistry 29 (1990) 2213-2219. [PMID: 2337600]

3. van Rooyen, J.P., Mienie, L.J., Erasmus, E., De Wet, W.J., Ketting, D., Duran, M. and Wadman, S.K. Identification of the stereoisomeric configurations of methylcitric acid produced by si-citrate synthase and methylcitrate synthase using capillary gas chromatography-mass spectrometry. J. Inherit. Metab. Dis. 17 (1994) 738-747. [PMID: 7707698]

[EC created 1961 as EC, transferred 2002 to EC, modified 2014]

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