An isoenzyme (or isozyme) is one of a group of enzymes that are very similar in catalytic properties, but may be differentiated by variations in physical properties, such as isoelectric point or electrophoretic mobility
(isozyme)- When two different enzymes catalyze the same reaction(s), they are isoenzymes of each other Isoenzymes could differ from each other in their primary structure or electrophoretic mobility