Pantoic acid
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| Names | |
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| Preferred IUPAC name
(2R)-2,4-Dihydroxy-3,3-dimethylbutanoic acid | |
| Other names
D-Pantoic acid; D-Pantoate; B(R)-2,4-dihydroxy-3,3-dimethylbutanoic acid | |
| Identifiers | |
3D model (JSmol) |
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| ChemSpider | |
PubChem CID |
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| UNII | |
CompTox Dashboard (EPA) |
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| Properties | |
| C6H12O4 | |
| Molar mass | 148.158 g·mol−1 |
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Pantoic acid is the alpha hydroxy acid with the formula HOCH2C(CH3)2CH(OH)CO2H. The compound is almost always encountered in a biological context, as an aqueous solution of its conjugate base pantoate HOCH2C(CH3)2CH(OH)CO2-. The amide of pantoic acid with β-alanine is pantothenic acid (vitamin B5),[1] a component of coenzyme A.
Biosynthesis
[edit]Its biosynthesis proceeds from ketoisovalerate by hydroxymethylation:
- (CH3)2CHC(O)CO2− + CH2O → HOCH2(CH3)2CC(O)CO2−
This conversion is catalyzed by ketopantoate hydroxymethyltransferase, which gives ketopantoic acid. This compound is reduced by ketopantoate reductase to (R)-pantoic acid, using NADPH as the hydride source.[2][3]
The amide derived from pantoic acid and GABA is the pharmaceutical drug hopantenic acid.
References
[edit]- ↑ Pantoic acid, Merriam Webster Medical Dictionary
- ↑ Enzyme 1.1.1.169 at KEGG Pathway Database.
- ↑ Begley, Tadhg P.; Kinsland, Cynthia; Strauss, Erick (2001). "The Biosynthesis of Coenzyme a in Bacteria". Cofactor Biosynthesis. Vitamins & Hormones. Vol. 61. pp. 157–171. doi:10.1016/S0083-6729(01)61005-7. ISBN 9780127098616. PMID 11153265.
External links
[edit]
Media related to Pantoic acid at Wikimedia Commons
