Definitions

1. noun

An enzyme that catalyzes the same reaction, but is encoded by a different gene and often has a different pH optimum, temperature optimum, or substrate specificity.

“Isoenzymes of lactate dehydrogenase are found in most body tissues, including muscle, liver, and red blood cells.”

2. noun

A form of an enzyme that differs in some of its properties but catalyzes the same reaction as the enzyme from which it is derived.

“The isoenzymes of the enzyme pyruvate kinase have different substrate specificities.”