Chorismic acid

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Chorismic acid
Chemical structure of chorismic acid
IUPAC name
(3R,4R)-3-[(1-carboxyvinyl)oxy]-4-hydroxycyclohexa-1,5-diene-1-carboxylic acid
3D model (JSmol)
ECHA InfoCard 100.164.204
Molar mass 226.184 g·mol−1
Melting point 140 °C (284 °F; 413 K)
GHS pictograms The exclamation-mark pictogram in the Globally Harmonized System of Classification and Labelling of Chemicals (GHS)The health hazard pictogram in the Globally Harmonized System of Classification and Labelling of Chemicals (GHS)
GHS signal word Danger
H302, H312, H315, H319, H332, H335, H350, H361
P201, P202, P261, P264, P270, P271, P280, P281, P301+312, P302+352, P304+312, P304+340, P305+351+338, P308+313, P312, P321, P322, P330, P332+313, P337+313, P362, P363, P403+233, P405, P501
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references

Chorismic acid, more commonly known as its anionic form chorismate, is an important biochemical intermediate in plants and microorganisms. It is a precursor for:

The name chorismic acid derives from a classical Greek word, χωρίζω meaning "to separate",[2] because the compound plays a role as a branch-point in aromatic amino acid biosynthesis.[3]


Shikimate → shikimate-3-phosphate → 5-enolpyruvylshikimate-3-phosphate (5-O-(1-carboxyvinyl)-3-phosphoshikimate)

Chorismate pathway 1.png

Chorismate synthase is an enzyme that catalyzes the final chemical reaction 5-O-(1-carboxyvinyl)-3-phosphoshikimate → chorismate + phosphate.

Chorismate pathway 2.png


Chorismate is transformed into para-aminobenzoic acid by the enzymes 4-amino-4-deoxychorismate synthase and 4-amino-4-deoxychorismate lyase.

Chorismate lyase is an enzyme that transforms chorismate into 4-hydroxybenzoate and pyruvate. This enzyme catalyses the first step in ubiquinone biosynthesis in Escherichia coli and other Gram-negative bacteria.


  1. ^ Wildermuth MC, Dewdney J, Wu G, Ausubel FM (2001). "Isochorismate synthase is required to synthesize salicylic acid for plant defence". Nature. 414 (6863): 562–5. doi:10.1038/35107108. PMID 11734859.
  2. ^ Henry George Liddell; Robert Scott; Henry Stuart Jones & Roderick McKenzie. A Greek-English Lexicon. ISBN 0-19-864226-1.
  3. ^ Gibson, F. (1999). "The elusive branch-point compound of aromatic amino acid biosynthesis". Trends in Biochemical Sciences. 24 (1): 36–38. doi:10.1016/S0968-0004(98)01330-9. PMID 10087921.

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