The action of beta-secretase is strongly tied to the onset of Alzheimer's disease. The development of inhibitors of beta-secretase is thus critical to combating this disease, which threatens an ever increasing number of the population and grows in importance as the population ages. Herein we show that flavones from Morus lhou potently inhibit beta-secretase. Our aim in this manuscript is to explore the inhibitory kinetics of natural compounds and develop a phamacophore model which details the critical features responsible for inhibitory activity. The IC(50) values of compounds for beta-secretase inhibition were determined to range between 3.4 and 146.1 muM. Prenylated flavone 2 (IC(50)=3.4 muM) was 20 times more effective than its parent compound, noratocarpetin 1 (IC(50)=60.6 muM). The stronger activity was related with resorcinol moiety on B-ring and isoprenyl functionality at C-3. Kinetic analysis shows that the four effective compounds (1-4) have a noncompetitive mode of action. The binding affinity of flavones for beta-secretase calculated using in silico docking experiments correlated well with their IC(50) values and noncompetitive inhibition modes.
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