: friedelin synthase : baccharis oxide synthase : α-seco-amyrin synthase : marneral synthase : β-seco-amyrin synthase : δ-amyrin synthase : tirucalladienol synthase : baruol synthase : methylornithine synthase : dTDP-fucopyranose mutase * : cobalt-precorrin-8 methylmutase * : precorrin-8X methylmutase * : D-ribose pyranase * : ethylmalonyl-CoA mutase * : 2-hydroxyisobutanoyl-CoA mutase * : pre-α-onocerin synthase * : α-onocerin synthase * : 4-amino-4-deoxychorismate mutase * *No Wikipedia article EC 5.5: Intramolecular Lyases EC 5.5.1: Intramolecular lyases (only sub-subclass identified to date) : muconate cycloisomerase : 3-carboxy-cis,cis-muconate cycloisomerase : tetrahydroxypteridine cycloisomerase : inositol-3-phosphate synthase : carboxy-cis,cis-muconate cyclase : chalcone isomerase : chloromuconate cycloisomerase : (+)-bornyl diphosphate synthase : cycloeucalenol cycloisomerase : α-pinene-oxide decyclase : dichloromuconate cycloisomerase : copalyl diphosphate synthase : ent-copalyl diphosphate synthase : syn-copalyl-diphosphate synthase : terpentedienyl-diphosphate synthase : halimadienyl-diphosphate synthase : (S)-β-macrocarpene synthase : lycopene ε-cyclase : lycopene β-cyclase : prosolanapyrone-III cycloisomerase : copal-8-ol diphosphate synthase. The enzyme was discovered at the public-review stage to have been misclassified and so was withdrawn. See , copal-8-ol diphosphate hydratase : (–)-bornyl diphosphate synthase * : aklanonic acid methyl ester cyclase * : tocopherol cyclase * : 3,6-anhydro-L-galactonate cycloisomerase * : nogalonic acid methyl ester cyclase * : D-galactarolactone cycloisomerase * : (–)-kolavenyl diphosphate synthase * : (+)-kolavenyl diphosphate synthase * : labda-7,13-dienyl diphosphate synthase * : hapalindole H synthase * : 12-epi-hapalindole U synthase * : 12-epi-fischerindole U synthase * : (+)-cis,trans-nepetalactol synthase * : (+)-cis,cis-nepetalactol synthase * : (+)-cis,cis-nepetalactol synthase * *No Wikipedia article EC 5.6: Isomerases altering macromolecular conformation EC 5.6.1: Enzymes altering polypeptide conformation or assembly (No entries at present) EC 5.6.2: Enzymes altering nucleic acid conformation (No entries at present) EC 5.99: Other Isomerases EC 5.99.1: Sole sub-subclass for isomerases that do not belong in the other subclasses : thiocyanate isomerase : Now , DNA topoisomerase : Now , DNA topoisomerase (ATP-hydrolysing) : 2-hydroxychromene-2-carboxylate isomerase References EC5 Isomerases