Enzymatic Liberation of Inorganic Phosphate from Adenosinetriphosphate by Tissues of Molgula manhattensis.

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Abstract
The enzymatic liberation of inorganic phosphate from adenosinetriphosphate was tested with homogenates of the pharynx, excretory organ, gonads, stomach, and gut of the tunicate Molgula following the method of Dubois and Potter [see B. A. 18(1): entry 193]. If calculated per dry wt. unit, the activity in the gut was found to be 4 times as high as in the stomach, 20 - 40 times as high as in the other tissues and twice as high as in mammalian muscle. Only a negligible activity was found with gut homogenates if glucerophosphate hexosediphosphate or ribonucleate was used as substrate or if Ca ions were omitted. An increase in the activity was found with increasing pH to 9.