Possible Interference by an Acid-stable Enzyme during the Extraction of Nucleoside Di- and Triphosphates from Higher Plant Tissues.
Acid extracts from tissues of two solanaceous plants were found to contain a heat-labile, nondialyzable factor which hydrolyzes nucleoside di- and triphosphates to nucleoside monophosphates. This acid-resistant factor shows optimal ATP-hydrolyzing activity at pH 5, whereas practically no activity was detected below pH 3 and above pH 9. It does not hydrolyze sugar phosphates, nucleoside monophosphates, uridine diphosphoglucose, and phosphoenolpyruvate. In order to estimate quantitatively the amount of nucleoside di- and triphosphates in a plant extract, care must be taken to circumvent possible interference by this factor. This is achieved by carefully maintaining the extract below pH 3.
Ikuma
H
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Department of Cellular and Molecular Biology, Division of Biological Sciences, University of Michigan, Ann Arbor, Michigan 48109.
Tetley
R M
RM