Plant Physiol. Journal of Pharmacology and Experimental Therapeutics
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Plant Physiology 54:601-607 (1974)
© 1974 American Society of Plant Biologists

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Multiple Amine Oxidases in Cucumber Seedlings 1

Frank W. Percival2 and William K. Purves3

a Department of Biological Sciences, University of California, Santa Barbara, California 93106

Cell-free extracts of cucumber (Cucumis sativus L. cv. National Pickling) seedlings were found to have amine oxidase activity when assayed with tryptamine as a substrate. Studies of the effect of lowered pH on the extract indicated that this activity was heterogeneous, and three amine oxidases could be separated by ion exchange chromatography. The partially purified enzymes were tested for their activities with several substrates and for their sensitivities to various amine oxidase inhibitors. One of the enzymes may be a monoamine oxidase, although it is inhibited by some diamine oxidase inhibitors. The other two enzymes have properties more characteristic of the diamine oxidases. The possible relationship of the amine oxidases to indoleacetic acid biosynthesis in cucumber seedlings is discussed.

2 Present address: Department of Botany and Plant Pathology, Michigan State University, East Lansing, Mich. 48823.

3 To whom inquiries should be addressed. Present address: Biological Sciences Group, University of Connecticut, Storrs, Conn. 06268.

1 Research was supported by National Science Foundation Grant GB-13219 to W. K. Purves and a National Science Foundation Predoctoral Fellowship to F. W. Percival.




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A. J. Tipping and M. J. McPherson
Cloning and Molecular Analysis of the Pea Seedling Copper Amine Oxidase
J. Biol. Chem., July 14, 1995; 270(28): 16939 - 16946.
[Abstract] [Full Text] [PDF]


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Copyright © 1974 by the American Society of Plant Biologists