| lyases | <enzyme> A class of enzymes that catalyze the cleavage of c-c, c-o, and c-n, and other bonds by other means than by hydrolysis or oxidation. Registry number: EC 4. (12 Dec 1998) |
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| aldehyde-lyases | <enzyme> Enzymes that catalyze cleavage of a carbon-carbon bond in a molecule containing a hydroxyl group and a carbonyl group to form two smaller molecules, each being an aldehyde or a ketone. The reaction is the reverse of an aldol condensation. These enzymes are also known as aldolases. Registry number: EC 4.1.2. (12 Dec 1998) |
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| amidine-lyases | <enzyme> These enzymes catalyze the elimination of ammonia from amidines with the formation of a double bond. Registry number: EC 4.3.2 (12 Dec 1998) |
| ammonia-lyases | <enzyme> Enzymes that catalyze the formation of a c=c bond in a molecule by liberation of ammonia. Registry number: EC 4.3.1. (12 Dec 1998) |
| carbon-carbon lyases | <enzyme> Enzymes that catalyze the cleavage of a carbon-carbon bond by means other than hydrolysis or oxidation. This subclass contains the decarboxylases, the aldehyde-lyases, and the oxo-acid-lyases. Registry number: EC 4.1 (12 Dec 1998) |
| carbon-nitrogen lyases | <enzyme> Enzymes that catalyze the cleavage of a carbon-nitrogen bond by means other than hydrolysis or oxidation. Subclasses are the ammonia-lyases, the amidine-lyases, the amine-lyases, and other carbon-nitrogen lyases. Registry number: EC 4.3 (12 Dec 1998) |
| carbon-oxygen lyases | <enzyme> Enzymes that catalyze the cleavage of a carbon-oxygen bond by means other than hydrolysis or oxidation. Registry number: EC 4.2 (12 Dec 1998) |
| carbon-sulfur lyases | <enzyme> Enzymes that catalyze the cleavage of a carbon-sulfur bond by means other than hydrolysis or oxidation. Registry number: EC 4.4 (12 Dec 1998) |
| carboxy-lyases | <enzyme> Enzymes that catalyze the nonhydrolytic addition or removal of a carboxyl group to or from a compound. They include the carboxylases and decarboxylases. Registry number: EC 4.1.1. (12 Dec 1998) |
| chondroitinases and chondroitin lyases | <enzyme> Enzymes which catalyze the elimination of glucuronate residues from chondroitin a,b, and c or which catalyze the hydrolysis of sulfate groups of the 2-acetamido-2-deoxy-d-galactose 6-sulfate units of chondroitin sulfate. Registry number: EC 4.2.2.- (12 Dec 1998) |
| chondroitin lyases | <enzyme> Enzymes which catalyze the elimination of delta-4,5-d-glucuronate residues from polysaccharides containing 1,4-beta-hexosaminyl and 1,3-beta-d-glucuronosyl or 1,3-alpha-l-iduronosyl linkages thereby bringing about depolymerization. Acts on chondroitin sulfate a and c as well as on dermatan sulfate and slowly on hyaluronate. Acts on chondroitin sulfate a and c. Registry number: EC 4.2.2.- (12 Dec 1998) |
| phosphorus-oxygen lyases | <enzyme> Enzymes that catalyze the cleavage of a phosphorus-oxygen bond by means other than hydrolysis or oxidation. Registry number: EC 4.6 (12 Dec 1998) |
| polysaccharide-lyases | <enzyme> A group of carbon-oxygen lyases. These enzymes catalyze the breakage of a carbon-oxygen bond in polysaccharides leading to an unsaturated product and the elimination of an alcohol. Registry number: EC 4.2.2. (12 Dec 1998) |
| hydro-lyases | <enzyme> Enzymes that catalyze the removal of water from a substrate by breakage of a carbon-oxygen bond, leading to formation of a double bond. The recommended name is usually dehydratase. The term synthase or hydratase is used when the reverse aspect of the reaction is dominant. Registry number: EC 4.2.1. (12 Dec 1998) |
| intramolecular lyases | <enzyme> Enzymes of the isomerase class that catalyze reactions in which a group can be regarded as eliminated from one part of a molecule, leaving a double bond, while remaining covalently attached to the molecule. Registry number: EC 5.5 (12 Dec 1998) |
| oxo-acid-lyases | <enzyme> Enzymes that catalyze the cleavage of a carbon-carbon bond of a 3-hydroxy acid. Registry number: EC 4.1.3. (12 Dec 1998) |