Figure 1.
Type I DHQD reaction intermediates and analogues. The DHQD-catalyzed reaction is depicted centrally. Quinate and shikimate, boxed on the sides, biosynthetically relate to DHQ and DHS, respectively. Schiff base formation occurs between the ε-amino group of Lys170 and C3 of the substrate. The atoms that are a part of Schiff base formation are colored red.