Lyase enzymes typically catalyze the breakdown of chemical bonds through a double bond or ring formation.
Hydrolase enzymes catalyze the hydrolysis of chemical bonds. They cleave bonds by adding water.
Transferase enzymes catalyze the transfer of a group from one compound to another compound, such as methyl, phospho or glycosyl groups.
Isomerase enzymes catalyze the structural rearrangement of isomers. Isomers are compounds with the same molecular formula but different structural formulas, and isomerases convert a molecule from one isomer to another.
Oxidoreductase enzymes catalyze oxidation and reduction reactions. This is the transfer of electrons (e-) from the oxidized molecule to the reduced molecule. Common names include dehydrogenase, reductase and oxidase.
Ligase enzymes catalyze the joining of two larger molecules by forming a chemical bond.
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