alexa Effect of natural and synthetic benzyl benzoates on calmodulin.
Chemistry

Chemistry

Natural Products Chemistry & Research

Author(s): RiveroCruz B, RiveroCruz I, RodrguezSotres R, Mata R

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Abstract The present investigation describes the effect of the spasmolytic benzylbenzoates 1-9 from Brickellia veronicifolia on CaM using a functional in vitro enzymatic assay. Bovine brain PDE1 was used as a monitoring enzyme. The most active natural inhibitors of the system CaM-PDE1 were benzyl benzoates 3-5, which inhibited the activity of PDE1 in a concentration-dependent manner. In addition, three series of analogs of compound 4, compounds 10a-32a, were prepared and assayed. The benzyl benzoates from the first series, namely 10a-24a, possess no substituents on ring B but different number and position of hydroxyl or methoxy groups in ring A. The second group (25-32a), on the other hand, possesses an A ring identical to that on compound 4, but different substituents in Ring B. The most active compounds were 14a, 15a and 30a. These compounds were two to six times more potent than chlorpromazine, a well known CaM inhibitor. Benzyl benzoates 14a and 15a have methoxyl groups at C-2/C-4 and C-3/C-4 in ring A, respectively; while 30a, in addition to the methoxyl groups at C-2/C-6 of ring A, hold a benzoyloxy moiety at C-3' of ring B. Kinetic studies revealed that compounds 3, 4, 14a, 15a and 30a behave as competitive CaM antagonists. This article was published in Phytochemistry and referenced in Natural Products Chemistry & Research

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