EC 1.3 Acting on the CH-CH group of donors

This subclass contains enzymes that introduce a double-bond into the substrate by direct dehydrogenation at a carbon-carbon single bond. Sub-subclasses are based on the acceptor: NAD+ or NADP+ (EC 1.3.1), a cytochrome (EC 1.3.2), oxygen (EC 1.3.3), a quinone or related compound (EC 1.3.5), an iron-sulfur protein (EC 1.3.7), a flavin (EC 1.3.8) or some other acceptor (EC 1.3.99).