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Schematic structures of the substrates used for enzyme activity analysis and the bulky alkaloid substrates hydrolysed by some GH1 representatives. Structures of para-nitrophenyl-beta-D-glucopyranoside (A.), quercetin species (B.), and the alkaloids strictosidine (C.), and raucaffricine (D.). Quercetin (R, R' = H), quercetin-3-glucoside (R = glucose and R' = H), quercetin-4'-glucoside (R = H and R' = glucose) and quercetin-3,4'-glucoside (R, R' = glucose).
