coenzyme, Any of a number of freely diffusing organic compounds that function as cofactor s with enzyme s in promoting a variety of metabolic reactions. Coenzyme Q10, also called CoQ10, supplements might be helpful for treating conditions such as congestive heart failure and preventing migraines. Most healthcare professionals think CoQ10 is safe, with few side effects. You can think of a coenzyme or cosubstrate as a helper molecule that aids an enzyme in catalyzing a chemical reaction. A coenzyme requires the presence of an enzyme in order to function. It is not active on its own. While enzymes are proteins, coenzymes are small, nonprotein molecules. Image Credit: Explode / Shutterstock.com What are coenzymes? A coenzyme is defined as an organic molecule that binds to the active sites of certain enzymes to assist in the catalysis of a. The meaning of COENZYME is a thermostable nonprotein compound that forms the active portion of an enzyme system after combination with an apoenzyme. A coenzyme is defined as a cocatalyst that is converted into a new product during each turnover of substrate and is subsequently regenerated through other enzyme-catalyzed reactions. Examples include pyridine nucleotides and flavins, which are involved in various oxidation–reduction reactions. A coenzyme functions by acting as a temporary carrier, shuttling specific chemical groups, electrons, or hydrogen atoms between molecules during a reaction. This transfer mechanism allows enzymes to transform starting materials, known as substrates, into the desired end products. Coenzyme A (CoA, SHCoA, CoASH) is a coenzyme, notable for its role in the synthesis and oxidation of fatty acids, and the oxidation of pyruvate in the citric acid cycle. A coenzyme is an organic non-protein compound that binds with an enzyme to catalyze a reaction. Coenzymes are often broadly called cofactors, but they are chemically different. Coenzyme Q10 (CoQ10) is a nutrient your body makes naturally. It’s also in many foods. CoQ10 acts as an antioxidant, which protects cells from damage and plays an important part in your.