- an enzyme that can be detected in a growing culture of a microorganism, after the addition of a particular substance (inducer) to the culture medium, but was not detectable prior to the addition and can act on the inducer. A prototype is the ß-galactosidase of Escherichia coli, synthesized on the addition of various galactosides, regardless whether these are good substrates.
- any enzyme that has its rate of biosynthesis increased due to the presence of the substrate or some other molecular entity.
Synonym(s): adaptive enzyme
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