apoenzyme

(ăp'ō-ĕn'zīm)
n.
The protein component of an enzyme, to which the coenzyme attaches to form an active enzyme.

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The protein part of an enzyme which requires a coenzyme for activity, and is therefore inactive if the coenzyme is absent. See also coenzyme; enzyme activation; prosthetic group.

(ăp'ō-ĕn'zīm)
n.

The protein component of an enzyme that combines with the coenzyme to form the active enzyme.

the protein part of an enzyme that forms a catalytically active enzyme (holoenzyme) when combined with an activator, a coenzyme, or a prosthetic group. It determines the specificity of the catalytic system.

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The protein component of an enzyme that requires the presence of the prosthetic group (cofactor) to form the functioning enzyme.