Plant Physiol.
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Plant Physiology 44:759-764 (1969)
© 1969 American Society of Plant Biologists

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Potato Sucrose Synthetase: Purification, Properties, and Changes in Activity Associated With Maturation

Russell Pressey

a Red River Valley Potato Processing Laboratory 1, East Grand Forks, Minnesota 56721

Sucrose synthetase activity is high in young potato tubers but decreases markedly during maturation. The activity decreases rapidly after the tubers are harvested and remains low regardless of storage temperature. This enzyme was purified 34-fold from freshly harvested immature potatoes. It catalyzes both cleavage and synthesis of sucrose but the 2 activities differ in a number of ways. The pH optima are 6.6 and 8.8 for sucrose cleavage and synthesis. respectively. Sucrose cleavage is activated 4-fold by mercaptoethanol and is inhibited by Mn2+. In contrast, sucrose synthesis is activated only slightly by either mercaptoethanol or Mn2+ alone but 2-fold in the presence of both reagents. However, it was not possible to resolve the 2 activities, their stabilities to partial thermal inactivation are identical, and their ratios are constant over a wide range of activities.

1 A laboratory cooperatively operated by the Eastern Utilization Research and Development Division, Agricultural Research Service, United States Department of Agriculture; Minnesota Agricultural Experiment Station; North Dakota Agricultural Experiment Station; and the Red River Valley Potato Growers' Association.




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Copyright © 1969 by the American Society of Plant Biologists