Plant Physiol.
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Plant Physiology 61:1037-1039 (1978)
© 1978 American Society of Plant Biologists

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Isoenzyme of Pyruvate Kinase in Proplastids from Developing Castor Bean Endosperm 1

Vincenzo De Luca and David T. Dennis

Department of Biology, Queen's University, Kingston, Ontario Canada K7L 3N6

Proplastids from developing castor bean (Ricinus communis) endosperm have a pyruvate kinase activity which is extremely unstable on isolation from the organelle. It can be stabilized by 20 mM 2-mercaptoethanol in 20% ethylene glycol. In contrast the soluble pyruvate kinase is stable at 60 C for 10 minutes. The two activities have different pH optima. The soluble and the proplastid activities are eluted from a diethylaminoethyl-Sephadex A-25 sievorptive column at different ionic strengths.

1 This research was supported by a grant to D. T. D. from the National Research Council of Canada and an Ontario Graduate Fellowship to V. D.




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L. D. Gottlieb
Conservation and Duplication of Isozymes in Plants
Science, April 23, 1982; 216(4544): 373 - 380.
[Abstract] [PDF]


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Copyright © 1978 by the American Society of Plant Biologists