IPTG is an analog of galactose that is nonmetabolizable and inactivates
the lac repressor to induce synthesis of β-galactosidase in E. coli.
The expression of cloned genes under the control of the lac operon is
induced by IPTG. IPTG is often used in the induction of recombinant
proteins, is a substrate for thigalactoside transacetylase and has been
reported to induce penicillinase in bacteria. IPTG is commonly used in
cloning procedures that require induction of β-galactosidase and is most
often used with X-Gal for blue/white bacterial colony screening.
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