noun
apoenzyme
Biochemistry term for the protein part of an enzyme, without its cofactor or prosthetic group.
アポ酵素は補因子と結合して活性型のホロ酵素になる。
The apoenzyme combines with a cofactor to become the active holoenzyme.
From English 'apoenzyme', itself from 'apo-' (Greek 'away from, separate') + 'enzyme'. The Japanese form combines the katakana prefix アポ with 酵素 (enzyme).