Record Information |
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Version | 2.0 |
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Created at | 2005-11-16 15:48:42 UTC |
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Updated at | 2024-09-03 04:19:21 UTC |
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NP-MRD ID | NP0000904 |
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Natural Product DOI | https://doi.org/10.57994/1724 |
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Secondary Accession Numbers | None |
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Natural Product Identification |
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Common Name | Homogentisic acid |
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Description | Homogentisic acid, also known as melanic acid, is an intermediate in the breakdown or catabolism of tyrosine and phenylalanine. It is generated from the compound p-hydroxyphenylpyruvate through the enzyme p-hydroxyphenylpyruvate dehydrogenase. The resulting homogentisic acid is then broken down into 4-maleylacetoacetate via the enzyme homogentisate 1,2-dioxygenase. Homogentisic acid is also found in other organisms. For instance, it can found in Arbutus unedo (strawberry-tree) honey, in the bacterial plant pathogen Xanthomonas campestris as well as in the yeast Yarrowia lipolytica where it is associated with the production of brown pigments. Homogentisic acid can be oxidatively dimerized to form hipposudoric acid, one of the main constituents of the 'blood sweat' of hippopotamuses. When present in sufficiently high levels, homogentisic acid can function as an osteotoxin and a renal toxin. An osteotoxin is a substance that causes damage to bones and/or joints. A renal toxin causes damage to the kidneys. Chronically high levels of homogentisic acid are associated with alkaptonuria (OMIM: 203500 ), An inborn error of metabolism. Alkaptonuria is a rare inherited genetic disorder in which the body cannot process the amino acids phenylalanine and tyrosine. It is caused by a mutation in the enzyme homogentisate 1,2-dioxygenase (EC 1.13.11.5), Which leads to an accumulation of homogentisic acid in the blood and tissues. Homogentisic acid and its oxidized form benzoquinone acetic acid are excreted in the urine, giving it an unusually dark color. The accumulating homogentisic acid (and benzoquinone acetic acid) causes damage to cartilage (ochronosis, leading to osteoarthritis) and heart valves as well as precipitating as kidney stones and stones in other organs. More specifically, homogentisic acid can be converted to benzoquinone acetic acid (BQA), and the resulting BQA can be readily converted to polymers that resemble the dark skin pigment melanin. These polymers are deposited in the collagen, a connective tissue protein, of particular tissues such as cartilage. This process is called ochronosis (as the tissue looks ochre); ochronotic tissue is stiffened and unusually brittle, impairing its normal function and causing damage. Homogentisic acid is the primary precursor of melanin synthesis in Vibrio cholerae. |
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Structure | InChI=1S/C8H8O4/c9-6-1-2-7(10)5(3-6)4-8(11)12/h1-3,9-10H,4H2,(H,11,12) |
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Synonyms | Value | Source |
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2,5-Dihydroxyphenylacetic acid | ChEBI | 2-(3,6-DIHYDROXYPHENYL)acetIC ACID | ChEBI | 2,5-Dihydroxyphenylacetate | Kegg | 2-(3,6-DIHYDROXYPHENYL)acetate | Generator | Homogentisate | Generator | (2,5-Dihydroxyphenyl)-acetate | HMDB | (2,5-Dihydroxyphenyl)-acetic acid | HMDB | 2,5-Dihydroxy-a-toluate | HMDB | 2,5-Dihydroxy-a-toluic acid | HMDB | 2,5-Dihydroxy-alpha-toluate | HMDB | 2,5-Dihydroxy-alpha-toluic acid | HMDB | 2,5-Dihydroxy-benzeneacetate | HMDB | 2,5-Dihydroxy-benzeneacetic acid | HMDB | Alcapton | HMDB | Homogentisate acid | HMDB | Homogentisinate | HMDB | Homogentisinic acid | HMDB | Melanic acid | HMDB | Acid, homogentisic | HMDB |
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Chemical Formula | C8H8O4 |
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Average Mass | 168.1467 Da |
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Monoisotopic Mass | 168.04226 Da |
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IUPAC Name | 2-(2,5-dihydroxyphenyl)acetic acid |
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Traditional Name | homogentisic acid |
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CAS Registry Number | 451-13-8 |
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SMILES | OC(=O)CC1=C(O)C=CC(O)=C1 |
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InChI Identifier | InChI=1S/C8H8O4/c9-6-1-2-7(10)5(3-6)4-8(11)12/h1-3,9-10H,4H2,(H,11,12) |
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InChI Key | IGMNYECMUMZDDF-UHFFFAOYSA-N |
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Experimental Spectra |
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| Spectrum Type | Description | Depositor Email | Depositor Organization | Depositor | Deposition Date | View |
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HMBC NMR | [1H, 13C] NMR Spectrum (2D, 600 MHz, CD3OD, experimental) | bgnzk@missouri.edu | MU Metabolomics Center, University of Missouri, Columbia. MO, USA | Dr. Bharat Goel | 2024-02-05 | View Spectrum | HSQC NMR | [1H, 13C] NMR Spectrum (2D, 600 MHz, CD3OD, experimental) | bgnzk@missouri.edu | MU Metabolomics Center, University of Missouri, Columbia. MO, USA | Dr. Bharat Goel | 2024-02-05 | View Spectrum | COSY NMR | [1H, 1H] NMR Spectrum (2D, 600 MHz, CD3OD, experimental) | bgnzk@missouri.edu | MU Metabolomics Center, University of Missouri, Columbia. MO, USA | Dr. Bharat Goel | 2024-02-05 | View Spectrum | 1D NMR | 13C NMR Spectrum (1D, 201 MHz, CD3OD, experimental) | bgnzk@missouri.edu | MU Metabolomics Center, University of Missouri, Columbia. MO, USA | Dr. Bharat Goel | 2024-02-05 | View Spectrum | 1D NMR | 1H NMR Spectrum (1D, 600 MHz, CD3OD, experimental) | bgnzk@missouri.edu | MU Metabolomics Center, University of Missouri, Columbia. MO, USA | Dr. Bharat Goel | 2024-02-05 | View Spectrum | 1D NMR | 1H NMR Spectrum (1D, 600 MHz, H2O, experimental) | Wishart Lab | Wishart Lab | David Wishart | 2021-06-20 | View Spectrum | 2D NMR | [1H, 13C]-HSQC NMR Spectrum (2D, 600 MHz, H2O, experimental) | Wishart Lab | Wishart Lab | David Wishart | 2021-06-20 | View Spectrum |
| Predicted Spectra |
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| Spectrum Type | Description | Depositor ID | Depositor Organization | Depositor | Deposition Date | View |
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| Chemical Shift Submissions |
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| Not Available | Species |
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Species of Origin | |
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Species Where Detected | |
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Chemical Taxonomy |
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Description | Belongs to the class of organic compounds known as 2(hydroxyphenyl)acetic acids. These are phenylacetic acids that carry a hydroxyl group at the 2-position. |
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Kingdom | Organic compounds |
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Super Class | Benzenoids |
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Class | Benzene and substituted derivatives |
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Sub Class | Phenylacetic acids |
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Direct Parent | 2(hydroxyphenyl)acetic acids |
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Alternative Parents | |
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Substituents | - 2(hydroxyphenyl)acetic acid
- Hydroquinone
- 1-hydroxy-2-unsubstituted benzenoid
- Phenol
- Monocarboxylic acid or derivatives
- Carboxylic acid
- Carboxylic acid derivative
- Organic oxygen compound
- Organic oxide
- Hydrocarbon derivative
- Organooxygen compound
- Carbonyl group
- Aromatic homomonocyclic compound
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Molecular Framework | Aromatic homomonocyclic compounds |
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External Descriptors | |
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Physical Properties |
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State | Solid |
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Experimental Properties | Property | Value | Reference |
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Melting Point | 153 °C | Not Available | Boiling Point | 439.30 °C. @ 760.00 mm Hg (est) | The Good Scents Company Information System | Water Solubility | 850 mg/mL at 25 °C | Not Available | LogP | 0.86 | Sangster, J. (1993). LOGKOW- a Databank of Evaluated Octanol-Water Partition Coefficients. Sangster Research Laboratories, Montreal. |
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Predicted Properties | |
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General References | - Phornphutkul C, Introne WJ, Perry MB, Bernardini I, Murphey MD, Fitzpatrick DL, Anderson PD, Huizing M, Anikster Y, Gerber LH, Gahl WA: Natural history of alkaptonuria. N Engl J Med. 2002 Dec 26;347(26):2111-21. [PubMed:12501223 ]
- Concepcion Masip T, Banares Baudet F, Traba ML, Rodriguez de Minon Cifuentes JL: [Alkaptonuria, prostatic calculi, and ectopic ureter]. Actas Urol Esp. 1997 Feb;21(2):167-70. [PubMed:9214216 ]
- Ehongo A, Schrooyen M, Pereleux A: [Important bilateral corneal astigmatism in a case of ocular ochronosis]. Bull Soc Belge Ophtalmol. 2005;(295):17-21. [PubMed:15849984 ]
- Deutsch JC, Santhosh-Kumar CR: Quantitation of homogentisic acid in normal human plasma. J Chromatogr B Biomed Appl. 1996 Feb 23;677(1):147-51. [PubMed:8925087 ]
- Janocha S, Wolz W, Srsen S, Srsnova K, Montagutelli X, Guenet JL, Grimm T, Kress W, Muller CR: The human gene for alkaptonuria (AKU) maps to chromosome 3q. Genomics. 1994 Jan 1;19(1):5-8. [PubMed:8188241 ]
- de Haas V, Carbasius Weber EC, de Klerk JB, Bakker HD, Smit GP, Huijbers WA, Duran M, Poll-The BT: The success of dietary protein restriction in alkaptonuria patients is age-dependent. J Inherit Metab Dis. 1998 Dec;21(8):791-8. [PubMed:9870204 ]
- Hegedus ZL, Nayak U: Homogentisic acid and structurally related compounds as intermediates in plasma soluble melanin formation and in tissue toxicities. Arch Int Physiol Biochim Biophys. 1994 May-Jun;102(3):175-81. [PubMed:8000039 ]
- Venkataseshan VS, Chandra B, Graziano V, Steinlauf P, Marquet E, Irmiere V, Needle MA: Alkaptonuria and renal failure: a case report and review of the literature. Mod Pathol. 1992 Jul;5(4):464-71. [PubMed:1495952 ]
- Bory C, Boulieu R, Chantin C, Mathieu M: Diagnosis of alcaptonuria: rapid analysis of homogentisic acid by HPLC. Clin Chim Acta. 1990 Jul;189(1):7-11. [PubMed:2383921 ]
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