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An example of a medicinal enzyme inhibitor is sildenafil (Viagra), a common treatment for male erectile dysfunction. Drugs also are used to inhibit enzymes needed for the survival of pathogens. For example, bacteria are surrounded by a thick cell wall made of a net-like polymer called peptidoglycan.
The inhibitor chemicallyresembles a (one of the) substrate(s) and binds in the active site in the same way as thesubstrate(s) binds. The inhibitor, however, has a functional group, ususally a leaving group,that is replaced by a nucleophile in the enzyme active site.herefore thistype of inhibition is called suicide inhibition or affinity labeling and the inhibitor is called a suicide inhibitor. This reaction with the suicide inhibitor removes active enzyme from the system; this removal is measured as inhibition.