Coenzyme A

Coenzyme A's functionalty depends on the presence of a Cofactor, which is a non protein group, that enables the Enzyme to function. Coenzyme A carries and Acetyl group to become Acetyl Coenzyme A ( Acetyl CoA)

References:

Alberts, B et al. (2008). Molecular Biology of the Cell. 5th ed. US: Garland Science.  p83-84

Hames, D et al. (2005) Biochemistry, 3rd ed.UK Taylor and Francis p88