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Plant Physiology 92:381-385 (1990)
© 1990 American Society of Plant Biologists

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Metabolism and Enzymology

Characteristics of the Inhibition of Potato (Solanum tuberosum) Invertase by an Endogenous Proteinaceous Inhibitor in Potatoes

Geracimo E. Bracho and John R. Whitaker

Department of Food Science and Technology, University of California, Davis, California 95616

Effect of several parameters on inhibition of potato (Solanum tuberosum) invertase by its endogenous proteinaceous inhibitor was determined using homogeneous preparations of both proteins. The inhibitor and invertase formed an inactive complex with an observed association rate constant at pH 4.70 and 37°C of 8.82 x 102 per molar per second and a dissociation rate constant of 3.3 x 10–3 per minute. The inhibitor appeared to bind to invertase in more than one step. Initial interaction (measured by loss of invertase activity) was rapid, relatively weak, readily reversible (Ki of 2 x 10–6 molar) and noncompetitive with substrate at pH 4.70. Initial interaction was probably followed by isomerization to a tighter (Ki of 6.23 x 10–8 molar) complex, which dissociated slowly with a half-time of 3.5 hour. Interaction between enzyme and inhibitor appeared to be of ionic character and essentially pH independent between pH 3.5 and 7.4.




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M.-R. Hajirezaei, Y. Takahata, R. N. Trethewey, L. Willmitzer, and U. Sonnewald
Impact of elevated cytosolic and apoplastic invertase activity on carbon metabolism during potato tuber development
J. Exp. Bot., February 1, 2000; 51(90001): 439 - 445.
[Abstract] [Full Text]


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