Abstract
A specially prepared and partially fractionated preparation of gymnemic acid compounds were found to be inhibitory to the ATPase system from housefly brain and labellum, and fish brain. Enzyme activity in a homogenate fraction from labellum showed greatest sensitivity to the gymnemic acid preparation. Na +-K + ATPase activity from the labellum, which contains the sweet taste sensory receptors, was inhibited by over 92% at a concentration of 4 middot; 10 −6 M gymnemic acid. Because gymnemic acid compounds are specific suppressants of sweet receptors, the evidence presented in this paper implies that a portion of the ATPase system may be biochemically important in the sweet-sensing mechanism.
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