Figure 2.

Chemical structure and biological functions of CoQ₁₀. (A) Enzymatic conversion of coenzyme-Q₁₀ from oxidized Ubiquinone (UQ) to reduced Ubiquinol (UQH2) form that is crucial for enzymatic activities of multiple cellular oxidoreductases (depicted in (B)). (B) Schematic representation of cellular and subcellular organelles indicating enzymatic complexes using CoQ₁₀ conversion for their activities (A).