This domain is found in 3-Deoxy-d-arabino-heptulosonate-7-phosphate synthase (DAHPS) present in Thermotoga maritime. DAHPS catalyzes the first reaction of the aromatic biosynthetic pathway in bacteria, fungi, and plants, the condensation of PEP and E4P with the formation of DAHP. The domain is ferredoxin-like and is thought to play a critical role in feedback regulation of the enzyme [1].

1: Crystal structure of the reaction complex of 3-deoxy-D-arabino-heptulosonate-7-phosphate synthase from Thermotoga maritima refines the catalytic mechanism and indicates a new mechanism of allosteric regulation. Shumilin IA, Bauerle R, Wu J, Woodard RW, Kretsinger RH; J Mol Biol. 2004;341:455-466. PMID:15276836