Lignostilbene-alpha,beta-dioxygenase (LSD, EC 184.108.40.206) is involved in oxidative cleavage of the central double bond of lignostilbene to form the corresponding aldehydes by a mechanism similar to those of 9-cis-epoxycarotenoid dioxygenase and beta-carotene 15,15'-dioxygenase, key enzymes in abscisic acid biosynthesis and vitamin A biosynthesis, respectively. In this study, several N-benzylideneanilines and amine were synthesized and examined for their efficacy as inhibitors of LSD. N-(4-Hydroxybenzylidene)-3-methoxyaniline was found to be a potent inhibitor with IC50 = 0.3 microM and N-(4-hydroxybenzyl)-3-methoxyaniline was also active with IC50 = 10 microM. The information obtained from the structure-activity relationships study here can aid in discovering inhibitors of both abscisic acid and vitamin A biosynthesis.
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