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Plant Physiology 72:1127-1129 (1983)
© 1983 American Society of Plant Biologists

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Subcellular Localization of Asparaginase and Asparagine Aminotransferase in Pisum sativum Leaves 1

Robert J. Ireland and Kenneth W. Joy

Biology Department, Carleton University, Ottawa, Ontario K1S 5B6 Canada

Protoplasts isolated from young and mature pea leaves (Pisum sativum L.) were broken and their contents fractionated by differential centrifugation or on sucrose-density gradients. Asparaginase was found only in the cytosol of young leaves. Asparagine aminotransferase was found in both young and mature leaves and was localized exclusively in the peroxisome. This corroborates the observation that asparagine transamination is catalyzed by the serine:glyoxylate aminotransferase.

1 Supported by grants to R. J. I. and K. W. J. from the Natural Sciences and Engineering Research Council of Canada.






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ASPB Publications PLANT PHYSIOLOGY THE PLANT CELL
Copyright © 1983 by the American Society of Plant Biologists