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Plant Physiology 72:604-605 (1983)
© 1983 American Society of Plant Biologists

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Regulation of Chloroplastic Carbonic Anhydrase 1

Effect of Magnesium

Michael A. Porter and Bernard Grodzinski2

Department of Horticulture Science, University of Guelph, Guelph, Ontario N1G 2W1 Canada

It was previously reported that magnesium ion inhibited carbonic anhydrase (Bamberger and Avron 1975 Plant Physiol 56: 481-485). Studies with partially purified carbonic anhydrase from spinach (Spinacia oleracea L.) chloroplasts show that the effect was the result of the chloride counterion and not the magnesium ion. Enzyme activity was reduced 50% upon addition of 3 to 10 millimolar MgCl2 or KCl while all additions of MgSO4 between 0.3 and 10 millimolar were mildly stimulatory.

2 To whom correspondence may be addressed.

1 Supported by grants from the Ontario Ministry of Agriculture and Food and the Natural Science and Engineering Research Council, Canada, to B. G.






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