#apoenzyme

• Apoferment — The proteinaceous, macromolecular, and thermolabile component of a conjugated enzyme, which determines its action specificity toward a specific substrate; a constituent part of a holoenzyme. To become catalytically active, this pure protein structure requires mandatory coupling with a non-protein component called a coenzyme or cofactor.
• Apozymase — The thermolabile protein component of an enzyme (also known as an apoenzyme), which becomes catalytically active only when combined with a non-protein structure called a coenzyme or cofactor. This macromolecular structural unit specifically determines the substrate specificity of the chemical reaction within living organisms.