Citizendium - a community developing a quality, comprehensive compendium of knowledge, online and free.
Click here to join and contribute
CZ thanks our previous donors. Donate here. Treasurer's Financial Report

Chorismate

From Citizendium
Jump to: navigation, search
This article is a stub and thus not approved.
Main Article
Discussion
Related Articles  [?]
Bibliography  [?]
External Links  [?]
Citable Version  [?]
 
This editable Main Article is under development and subject to a disclaimer.
(CC) Image: David E. Volk
Chorismate structure.

Chorismate is the chemical precursor for the bacterial synthesis of the essential amino acids phenylalanine, tyrosine and tryptophan. The synthesis of phenylalanine and tyrosine occur from the conversion of chorismate to prephenate, at which point their syntheses diverge. Chorismate itself results from a six-step reaction starting from erythrose-4-phosphate. For the synthesis of phenylalanine, chorismate is converted to prephenate by a mutase. Prephenate is then dehydrated and decarboxylated to provide phenylpyruvate. In the synthesis of tyrosine, this step is an oxidative decarboxylation reaction that leaves the hydroxyl group on the aromatic ring. Finally, the α-keto acid is converted to phenylalanine by a transamination reaction.

(CC) Image: David E. Volk
Conversion of chorismate to phenylalanine and tyrosine.