See isozyme. 
<biochemistry> Variants of enzymes that catalyse the same reaction, but owing to differences in amino acid sequence can be distinguished by techniques such as electrophoresis or isoelectric focusing. ... Different tissues often have different isoenzymes. The sequence differences generally confer different enzyme kinetic parameters that can so...
(i″so-en´zīm) isozyme.
An enzyme performing the same function as another enzyme but having a different set of amino acids.
One or more forms of an enzyme having catalytic properties ascribed to that enzyme.
Type: Term Pronunciation: ī′sō-en′zīm Definitions: 1. An enzyme (one of a group) that catalyze the same reaction but may be differentiated by variations in physical properties, such as isoelectric point, electrophoretic mobility, kinetic parameters, or modes of regulation, lactate dehydrogenase, a tetramer composed of var...