Which enzyme is classified as a transferase?

The enzyme classified as a transferase is creatine kinase (CK). Transferases are enzymes that catalyze the transfer of a functional group from one molecule to another. In the case of CK, it facilitates the transfer of a phosphate group from ATP to creatine, forming creatine phosphate and ADP. This reaction is crucial in energy metabolism, particularly in muscle tissues where quick energy release is necessary during intense physical activity.

Understanding CK's primary function helps clarify its classification as a transferase, distinguishing it from other types of enzymes. Alkaline phosphatase (ALP) functions as a hydrolase, amylase is a carbohydrase that breaks down starches, and lactate dehydrogenase (LD) catalyzes the conversion of lactate and pyruvate through oxidation-reduction reactions, thus being categorized as an oxidoreductase rather than a transferase.