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Table 1 The E.C. classification layout of enzymes according to the IUBMB enzyme nomenclature
Class
Subclass
sub-subclass
Reaction type
EC 1: Oxidoreductases
EC 1.1
Acting on the CH–OH group of donors
EC 1.1.1 NAD or NADP as acceptor
EC 1.1.2 Cytochrome as acceptor
EC 1.1.3 Oxygen as acceptor
EC 1.1.4 Disulfide as acceptor
EC 1.1.5 Quinine or similar compound as acceptor
EC 1.1.99 Other acceptors
EC 1.2
Acting on the aldehyde or oxo group of donors
EC 1.2.1 NAD or NADP as acceptor
EC 1.2.2 Cytochrome as acceptor
EC 1.2.3 Oxygen as acceptor
EC 1.2.4 Disulfide as acceptor
EC 1.2.7 Iron–sulfur protein as acceptor
EC 1.2.99 Other acceptors
EC 1.3
Acting on the CH–CH group of donors
EC 1.3.1 NAD or NADP as acceptor
EC 1.3.2 Cytochrome as acceptor
EC 1.3.3 Oxygen as acceptor
EC 1.3.5 Quinine or similar compound as acceptor
EC 1.3.7 Iron–sulfur protein as acceptor
EC 1.3.99 Other acceptors
EC 1.4
Acting on the CH–NH 2 group of donor
EC 1.4.1 NAD or NADP as acceptor
EC 1.4.2 Cytochrome as acceptor
EC 1.4.3 Oxygen as acceptor
EC 1.4.4 Disulfide as acceptor
EC 1.4.7 Iron–sulfur protein as acceptor
EC 1.4.99 Other acceptors
EC 1.5
Acting on the CH–NH group of donors
EC 1.5.1 NAD or NADP as acceptor
EC 1.5.3 Oxygen as acceptor
EC 1.5.4 Disulfide as acceptor
EC 1.5.5 Quinine or similar compound as acceptor
EC 1.5.99 Other acceptors
EC 1.6
Acting on NADH or NADPH
EC 1.6.1 NAD or NADP as acceptor
EC 1.6.2 Cytochrome as acceptor
EC 1.6.4 Disulfide as acceptor
EC 1.6.5 Quinine or similar compound as acceptor
EC 1.6.6 Nitrogenous group as acceptor
(continued)
S. A. Rather et al.