Plant Physiol. Drug Metab Dispos
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Plant Physiology 66:1091-1094 (1980)
© 1980 American Society of Plant Biologists

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S-Adenosylmethionine Decarboxylase of Corn Seedlings 1

Yonezo Suzuki and Eiji Hirasawa

Department of Biology, Faculty of Science, Osaka City University, Sumiyoshi-ku, Osaka 558, Japan

S-Adenosylmethionine decarboxylase (EC 4.1.1.50) has been purified 500-fold in 30% yield from the extract of etiolated corn seedlings (cv. Golden Crossbantam Bell). This preparation had a molecular weight of approximately 25,000. The Km value was 5 micromolar for S-adenosylmethionine. Methylglyoxal bis(guanylhydrazone), hydroxylamine, and sulfhydryl reagents (such as p-hydroxymercuriphenylsulfonate and N-ethylmaleimide) were effective inhibitors of this enzyme. Germination of corn seed was accompanied by a rapid increase in enzyme activity and maximum activity occurred in 5-day-old seedlings.

1 This work was supported in part by Grant-in-Aid for Scientific Research 434034 from the Ministry of Education, Science and Culture, Japan.






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Copyright © 1980 by the American Society of Plant Biologists