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Multiple forms of alkaline phosphatase from Escherichia coli cells with repressed and derepressed biosynthesis of the enzyme.

ABSTRACT

Isolation of multiple forms of alkaline phosphatase from Escherichia coli cells with repressed and derepressed biosynthesis of the enzyme is reported. Three enzyme forms were isolated from cells with derepressed synthesis, and one form was isolated from cells with repressed enzyme synthesis. The multiple enzyme forms did not differ in pH optimum, thermostability, or the degree of inhibition with orthophosphate; however, they did differ in the relative rate of hydrolysis of different substrates. The addition of substrates to the cells during enzyme derepression resulted in changes of the ratio of the multiple forms.

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