adaptive enzyme


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in·duced en·zyme

, inducible enzyme
1. 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 β-galactosidase of Escherichia coli, synthesized on the addition of various galactosides, regardless whether these are good substrates. Compare: constitutive enzyme.
2. 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

adaptive enzyme

an enzyme that is produced by an organism, e.g. a bacterium, only in the presence of its normal substrate or a closely similar substance. Such enzymes are not produced in circumstances to which the organism is not adapted. See OPERON MODEL.
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