Record Information
Version 1.0
Update Date 1/22/2018 12:54:54 PM
Metabolite IDPAMDB000178
Name: Methylcitric acid
Description:Methylcitric acid (MCA) is formed by condensation of accumulated propionyl- CoA and oxalacetate by the enzyme si-citrate synthase (EC MCA molecule has two stereogenic centers so that it can occur in the form of four stereoisomers.
  • (2S,3S)-2-hydroxybutane-1,2,3-tricarboxylate
  • (2S,3S)-2-hydroxybutane-1,2,3-tricarboxylate
  • (2S,3S)-2-hydroxybutane-1,2,3-tricarboxylic acid
  • (2S,3S)-2-methylcitrate
  • (2S,3S)-2-methylcitric acid
  • 2-Hydroxy-1,2,3-butanetricarboxylate
  • 2-Hydroxy-1,2,3-butanetricarboxylic acid
  • 2-Hydroxybutane-1,2,3-tricarboxylate
  • 2-Hydroxybutane-1,2,3-tricarboxylic acid
  • 2-Methylcitrate
  • 2-Methylcitric acid
  • Methylcitrate
Chemical Formula: C7H10O7
Average Molecular Weight: 206.1501
Monoisotopic Molecular Weight: 206.042652674
CAS number: 6061-96-7
IUPAC Name:2-hydroxy-1-methylpropane-1,2,3-tricarboxylic acid
Traditional IUPAC Name: methylcitric acid
Chemical Taxonomy
Taxonomy DescriptionThis compound belongs to the class of organic compounds known as tricarboxylic acids and derivatives. These are carboxylic acids containing exactly three carboxyl groups.
Kingdom Organic compounds
Super ClassOrganic acids and derivatives
Class Carboxylic acids and derivatives
Sub ClassTricarboxylic acids and derivatives
Direct Parent Tricarboxylic acids and derivatives
Alternative Parents
  • Tricarboxylic acid or derivatives
  • Beta-hydroxy acid
  • Hydroxy acid
  • Alpha-hydroxy acid
  • Tertiary alcohol
  • Carboxylic acid
  • Hydrocarbon derivative
  • Organooxygen compound
  • Carbonyl group
  • Alcohol
  • Aliphatic acyclic compound
Molecular Framework Aliphatic acyclic compounds
External Descriptors Not Available
Physical Properties
State: Solid
Melting point: Not Available
Experimental Properties:
Predicted Properties
Water Solubility175.0 mg/mLALOGPS
pKa (Strongest Acidic)3.18ChemAxon
pKa (Strongest Basic)-4.3ChemAxon
Physiological Charge-3ChemAxon
Hydrogen Acceptor Count7ChemAxon
Hydrogen Donor Count4ChemAxon
Polar Surface Area132.13 Å2ChemAxon
Rotatable Bond Count5ChemAxon
Refractivity40.2 m3·mol-1ChemAxon
Polarizability17.21 Å3ChemAxon
Number of Rings0ChemAxon
Rule of FiveYesChemAxon
Ghose FilterYesChemAxon
Veber's RuleYesChemAxon
MDDR-like RuleYesChemAxon
Biological Properties
Cellular Locations: Cytoplasm
Spectrum TypeDescriptionSplash Key
Predicted LC-MS/MSPredicted LC-MS/MS Spectrum - 10V, Positivesplash10-000i-0900000000-be0da5c29220e9e50325View in MoNA
Predicted LC-MS/MSPredicted LC-MS/MS Spectrum - 20V, Positivesplash10-05i0-9600000000-2bead66ba2514df6497fView in MoNA
Predicted LC-MS/MSPredicted LC-MS/MS Spectrum - 40V, Positivesplash10-1093-7900000000-e7a5530b8562d859e032View in MoNA
Predicted LC-MS/MSPredicted LC-MS/MS Spectrum - 10V, Negativesplash10-0900-1910000000-0a84eb8e0df2e6eb450dView in MoNA
Predicted LC-MS/MSPredicted LC-MS/MS Spectrum - 20V, Negativesplash10-07vi-4900000000-e89ea7de4d7e433cae1eView in MoNA
Predicted LC-MS/MSPredicted LC-MS/MS Spectrum - 40V, Negativesplash10-0a4i-9300000000-c68ffdf8bf6f5380005eView in MoNA
  • Allen RH, Stabler SP, Savage DG, Lindenbaum J: Elevation of 2-methylcitric acid I and II levels in serum, urine, and cerebrospinal fluid of patients with cobalamin deficiency. Metabolism. 1993 Aug;42(8):978-88. Pubmed: 8345822
  • Bergstrom T, Greter J, Levin AH, Steen G, Tryding N, Wass U: Propionyl-CoA carboxylase deficiency: case report, effect of low-protein diet and identification of 3-oxo-2-methylvaleric acid 3-hydroxy-2-methylvaleric acid, and maleic acid in urine. Scand J Clin Lab Invest. 1981 Apr;41(2):117-26. Pubmed: 7313494
  • Busch M, Stein G, Poppitz W, Hein G, Muller A: Validated capillary gas chromatographic-mass spectrometric assay to determine 2-methylcitric acid I and II levels in human serum by using a pulsed splitless injection procedure. J Chromatogr B Analyt Technol Biomed Life Sci. 2002 Aug 5;775(2):215-23. Pubmed: 12113988
  • Guneral F, Bachmann C: Age-related reference values for urinary organic acids in a healthy Turkish pediatric population. Clin Chem. 1994 Jun;40(6):862-6. Pubmed: 8087979
  • Kanehisa, M., Goto, S., Sato, Y., Furumichi, M., Tanabe, M. (2012). "KEGG for integration and interpretation of large-scale molecular data sets." Nucleic Acids Res 40:D109-D114. Pubmed: 22080510
  • Keseler, I. M., Collado-Vides, J., Santos-Zavaleta, A., Peralta-Gil, M., Gama-Castro, S., Muniz-Rascado, L., Bonavides-Martinez, C., Paley, S., Krummenacker, M., Altman, T., Kaipa, P., Spaulding, A., Pacheco, J., Latendresse, M., Fulcher, C., Sarker, M., Shearer, A. G., Mackie, A., Paulsen, I., Gunsalus, R. P., Karp, P. D. (2011). "EcoCyc: a comprehensive database of Escherichia coli biology." Nucleic Acids Res 39:D583-D590. Pubmed: 21097882
  • Krawczyk H, Gradowska W: 1H NMR spectra of methylcitric acid in urine. J Inherit Metab Dis. 2007 Apr;30(2):263. Epub 2007 Feb 14. Pubmed: 17295121
  • Thompson GN, Chalmers RA: Increased urinary metabolite excretion during fasting in disorders of propionate metabolism. Pediatr Res. 1990 Apr;27(4 Pt 1):413-6. Pubmed: 2342832
  • van der Werf, M. J., Overkamp, K. M., Muilwijk, B., Coulier, L., Hankemeier, T. (2007). "Microbial metabolomics: toward a platform with full metabolome coverage." Anal Biochem 370:17-25. Pubmed: 17765195
  • Vijayendran, C., Barsch, A., Friehs, K., Niehaus, K., Becker, A., Flaschel, E. (2008). "Perceiving molecular evolution processes in Escherichia coli by comprehensive metabolite and gene expression profiling." Genome Biol 9:R72. Pubmed: 18402659
  • Winder, C. L., Dunn, W. B., Schuler, S., Broadhurst, D., Jarvis, R., Stephens, G. M., Goodacre, R. (2008). "Global metabolic profiling of Escherichia coli cultures: an evaluation of methods for quenching and extraction of intracellular metabolites." Anal Chem 80:2939-2948. Pubmed: 18331064
Synthesis Reference: Ewering, Christian; Braemer, Christian Oliver; Steinbuechel, Alexander. Production of 2-methylcitric acid by a recombinant Ralstonia eutropha strain. PCT Int. Appl. (2007), 30pp. CODEN: PIXXD2 WO 2007101866 A2 20070913 CAN 147:363646 AN 20
Material Safety Data Sheet (MSDS) Download (PDF)
External Links:
Pubchem Compound ID515
Kegg IDC02225
ChemSpider ID500
Wikipedia IDNot Available
BioCyc IDCPD-622
EcoCyc IDCPD-622