Skip to main content

Classification of Enzyme, IUB classification

Apollo Pharmacy hiring

GPAT courses

Apollo Pharmacy hiring

pharma courses

                            Classification of Enzymes

Enzymes are broadly of two types:

1.) Intracellular or Endoenzymes:-
They are functional within cells where they are synthesized.

2.)Extracellular or Exoenzymes:
These enzymes are active outside the cells.
Example: Digestive enzymes like Pepsin, Trypsin, Amylase.

Classification of Enzymes by IUB System,
Enzymes are classified by complex system, suggested by commission on enzymes of International Union of Biochemistry (IUB). Based on their action they are divided into 6 major classes. Each enzyme is assigned a 4 Digit code number.

Enzymes in this class are involved in Oxidation-Reduction reactions.
Example: Alcohol Dehydrogenase.

Enzymes that catalyze transfer of Functional groups are called as Transferases.
Example: Phosphorylases

These are enzymes that bring about hydrolysis of various compounds.
Example: Lipase

Enzymes specialized in addition or removal of water.
Example: Aldolase

Enzymes involved in all isomerization reactions.
Example: Phosphotriose Isomerase.

Enzymes catalyzing synthetic reactions where two molecules are joined together and ATP are used.
Example: Succinate thiokinase