| aldose-ketose isomerases | <enzyme> Enzymes that catalyze the interconversion of aldoses and ketoses. Registry number: EC 5.3.1 (12 Dec 1998) |
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| amino acid isomerases | <enzyme> Enzymes that catalyze either the racemization or epimerization of chiral centres within amino acids or derivatives. Registry number: EC 5.1.1.- (12 Dec 1998) |
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| carbon-carbon double bond isomerases | <enzyme> Enzymes that catalyze the shifting of a carbon-carbon double bond from one position to another within the same molecule. Registry number: EC 5.3.3 (12 Dec 1998) |
| cis-trans-isomerases | <enzyme> Enzymes that catalyze the rearrangement of geometry about double bonds. Registry number: EC 5.2 (12 Dec 1998) |
| steroid isomerases | <enzyme> Enzymes that catalyze the transposition of double bond(s) in a steroid molecule. Registry number: EC 5.3.3.- (12 Dec 1998) |
| sulfur-sulfur bond isomerases | <enzyme> Enzymes that catalyze the transposition of a sulfur-sulfur bond. Registry number: EC 5.3.4 (12 Dec 1998) |
| isomerases | <enzyme> A class of enzymes that catalyze geometric or structural changes within a molecule to form a single product. The reactions do not involve a net change in the concentrations of compounds other than the substrate and the product. Registry number: EC 5. (12 Dec 1998) |