The Regulation of Invertase Synthesis in Sugar-Cane: Effects of Sugars, Sugar Derivatives, and Polyhydric Alcohols

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Abstract
The acid invertase content of tissue slices from immature internodes of sugarcane decreases rapidly when glucose is supplied in the bathing medium, maximum effectiveness occurring at about 0.03m. The extracted enzyme is unstable in solution at pH values below 5.0, but glucose (0.1m) does not effect stability. The pH of juice was not altered by incubation of tissues in glucose for 8 hr. Treatments which induced a sixfold change in invertase content gave no significant changes in protein nitrogen content of the tissue. The effectiveness of a large number of sugars and related compounds in changing the acid invertase content of the tissue has been examined. An interpretation is given in terms of the hypothesis that occupation of a controller site by D-glucose or suitable structural analogues regulates synthesis of the enzyme.

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