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Dehydroquinate synthase (DHQS) catalyzes the conversion of DAHP to DHQ in shikimate pathway for aromatic compounds synthesis Dehydroquinate synthase (DHQS) catalyzes the conversion of 3-deoxy-D-arabino-heptulosonate-7-phosphate (DAHP) to dehydroquinate (DHQ) in the second step of the shikimate pathway. This pathway, which involves seven sequential enzymatic steps in the conversion of erythrose 4-phosphate and phosphoenolpyruvate into chorismate for subsequent synthesis of aromatic compounds, is found in bacteria, microbial eukaryotes, and plants, but not in mammals. Therefore, enzymes of this pathway are attractive targets for the development of non-toxic antimicrobial compounds, herbicides and anti-parasitic agents. The activity of DHQS requires nicotinamide adenine dinucleotide (NAD) as cofactor. A single active site in DHQS catalyzes five sequential reactions involving alcohol oxidation, phosphate elimination, carbonyl reduction, ring opening, and intramolecular aldol condensation. The binding of substrates and ligands induces domain conformational changes. In some fungi and protozoa, this domain is fused with the other four domains in shikimate pathway and forms a penta-domain AROM protein, which catalyzes steps 2-6 in the shikimate pathway. |
Jiyao W et al.(2023). "The conserved domain database in 2023.",