1. Enzyme classification

The classification of enzymes, based on the nomenclature of the Enzyme Commission (EC), allows each enzyme to be designated by a code name, and takes into account the specific nomenclature of the IUBMB (International Union of Biochemistry and Molecular Biology).

Each enzyme is assigned a series of numbers. The first number, N, following the EC, corresponds to the enzyme class. There are 7, each of which relates to a type of catalyzed reaction.

After the number N corresponding to the class (EC N), we find the number X of the sub-class most often designating the donor, the transferred group, the nature of the substrate, as the case may be, in relation to the family of the transformed substrate(s).

The number of the subclass X (EC N-X) is followed by the number Y of the sub-subclass designating a characteristic complementary...