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Plant Physiology 65:447-450 (1980)
© 1980 American Society of Plant Biologists

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Articles

Biochemical Characterization of an Acetylcholine-hydrolyzing Enzyme from Bean Seedlings 1

Manfred Ernst and Elmar Hartmann

Institut für Allgemeine Botanik der Johannes Gutenberg-Universität Mainz, Saarstrasse 21, 6500 Mainz, Federal Republic of Germany

An acetylcholine hydrolyzing enzyme was prepared and purified (40 times) from dwarf bean hypocotyl hooks. The purity of the enzyme was proved by polyacrylamide gel electrophoresis. The molecular weight of the enzyme was determined to be 65,000 daltons. Enzyme activity was the highest at pH 8.0 and between 30 and 36 C. The enzyme had an apparent affinity constant (Km) for acetylcholine of 460/micromolar. The affinity for substrate analogs increased from butyrylthiocholine to propionylthiocholine to acetylthiocholine. The enzyme activity was inhibited by choline, neostigmine, physostigmine, manganese, and calcium. Magnesium had no influence on the enzyme activity. We conclude that the enzyme from dwarf beans is an acetylcholinesterase (EC 3.1.1.7).

1 This work was supported by a grant from the Deutsche Forschungsgemeinschaft.






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Copyright © 1980 by the American Society of Plant Biologists