A common factor in the enzymatic acetylation of sulfanilamide and of choline.

Lipmann shared the 1953 Nobel Prize in Physiology or Medicine for his discovery of coenzyme A, an important catalytic substance involved in the cellular conversion of food into energy. He first described the discovery in his paper entitled "Acetylation of sulfanilamide by liver homogenates and extracts," Journal of Biological Chemistry 160, 1945. See No. 14284. In the above paper (No. 751.3) Lipmann isolated the new co-factor and named it coenzyme A.