This domain is found in chorismate pyruvate-lyases (EC:4.1.3.40, also known as 4-HB synthase and p-hydroxybenzoic acid synthase) such as those found in Mycobacterium tuberculosis where it removes the pyruvyl group from chorismate to provide 4-hydroxybenzoate (4HB) [1]. The chorismate pyruvate-lyase encoded by sll1797 in cyanobacteria Synechocystis sp. , has been shown to catalyse the initial and essential step in plastoquinone biosynthesis [2]. In E. coli, the chorismate lyase (UbiC) catalyses the conversion of chorismate to p-hydroxybenzoate and pyruvate in the biosynthesis of ubiquinone as well [3].

1: p-Hydroxybenzoic acid synthesis in Mycobacterium tuberculosis. Stadthagen G, Kordulakova J, Griffin R, Constant P, Bottova I, Barilone N, Gicquel B, Daffe M, Jackson M; J Biol Chem. 2005;280:40699-40706. PMID:16210318

2: Chorismate pyruvate-lyase and 4-hydroxy-3-solanesylbenzoate decarboxylase are required for plastoquinone biosynthesis in the cyanobacterium Synechocystis sp. PCC6803. Pfaff C, Glindemann N, Gruber J, Frentzen M, Sadre R; J Biol Chem. 2014;289:2675-2686. PMID:24337576

3: Functional analysis of genes for benzoate metabolism in the albicidin biosynthetic region of Xanthomonas albilineans. Hashimi SM, Birch RG; Appl Microbiol Biotechnol. 2010;87:1475-1485. PMID:20437231