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Unformatted text preview: phosphate group using energy obtained from some energy-rich molecule (like glucose). Cofactors are nonprotein molecules that assist enzymes. A holoenzyme is the union of the cofactor and the enzyme (called an apoenzyme when part of a holoenzyme). If cofactors are organic, they are called coenzymes and usually function to donate or accept some component of a reaction, often electrons. Some vitamins are coenzymes or components of coenzymes. Inorganic cofactors are often metal ions, such as Fe ++ . Figure 1. The high-energy bonds of adenosine triphosphate (ATP)....
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- Fall '10