apoenzyme
/ˌæpoʊˈɛnzaɪm/
noun
- The protein part of an enzyme that requires a cofactor (such as a vitamin or metal ion) to become active.
- Without its cofactor, the apoenzyme cannot catalyze any reaction.
- The scientist isolated the apoenzyme and then added the necessary metal ion.
- In the lab, students learned how an apoenzyme combines with a coenzyme to form a complete enzyme.