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Plant Physiology 99:1251-1253 (1992)
© 1992 American Society of Plant Biologists

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Metabolism and Enzymology

Galactinol Synthase is an Extravacuolar Enzyme in Tubers of Japanese Artichoke (Stachys sieboldii) 1

Felix Keller

Institute of Plant Biology, University of Zürich, Zollikerstr. 107, CH-8008 Zürich, Switzerland

Galactinol synthase (GS, UDP-{alpha}-D-galactose:1L-myo-inositol-1-O- {alpha}-D-galactopyranosyltransferase) is a key enzyme in the biosynthetic pathway of the raffinose family of oligosaccharides. The subcellular location of GS was studied in the parenchyma of stachyose-storing tubers of Japanese artichoke (Stachys sieboldii) by isolation of protoplasts and vacuoles. A comparison of the activities of GS, malate dehydrogenase, and alcohol dehydrogenase (extravacuolar markers) and {alpha}-mannosidase and {beta}-N-acetylglucosaminidase (vacuolar markers) in parenchyma protoplasts with those of vacuoles isolated from them showed that GS was an extravacuolar enzyme.

1 This work was supported by the Swiss National Foundation.




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Copyright © 1992 by the American Society of Plant Biologists