* *No Wikipedia article EC 5.2: cis-trans-Isomerases EC 5.2.1: cis-trans Isomerases (only sub-subclass identified to date) : maleate isomerase : maleylacetoacetate isomerase : Now known to be catalysed by a pathway involving , NADP-retinol dehydrogenase; , phosphatidylcholine—retinol O-acyltransferase; , retinoid isomerohydrolase; and , 11-cis-retinol dehydrogenase. : maleylpyruvate isomerase : linoleate isomerase : furylfuramide isomerase : transferred to , retinoid isomerohydrolase : peptidylprolyl isomerase : farnesol 2-isomerase : 2-chloro-4-carboxymethylenebut-2-en-1,4-olide isomerase : The existence of this enzyme has been called into question by one of the authors of the reference cited : ζ-carotene isomerase : prolycopene isomerase : β-carotene isomerase EC 5.3: Intramolecular Oxidoreductases EC 5.3.1: Interconverting Aldoses and Ketoses : triose-phosphate isomerase : deleted : D-arabinose isomerase : L-arabinose isomerase : xylose isomerase : ribose-5-phosphate isomerase : mannose isomerase : mannose-6-phosphate isomerase : glucose-6-phosphate isomerase : Now , glucosamine-6-phosphate deaminase : deleted : glucuronate isomerase : arabinose-5-phosphate isomerase : L-rhamnose isomerase : D-lyxose ketol-isomerase : 1-(5-phosphoribosyl)-5-[(5-phosphoribosylamino)methylideneamino]imidazole-4-carboxamide isomerase : 5-dehydro-4-deoxy-D-glucuronate isomerase : deleted: reaction is due to glucose-6-phosphate isomerase, in the presence of arsenate, or xylose isomerase : Now , glutamine—fructose-6-phosphate transaminase (isomerizing) : ribose isomerase : corticosteroid side-chain-isomerase : hydroxypyruvate isomerase : S-methyl-5-thioribose-1-phosphate isomerase : phosphoribosylanthranilate isomerase : L-fucose isomerase : galactose-6-phosphate isomerase : 6-phospho-3-hexuloisomerase : D-sedoheptulose 7-phosphate isomerase : ribose 1,5-bisphosphate isomerase * : 5-deoxy-glucuronate isomerase * : sulfoquinovose isomerase * : (4S)-4-hydroxy-5-phosphooxypentane-2,3-dione isomerase * : L-erythrulose 1-phosphate isomerase * : D-erythrulose 4-phosphate isomerase * : 2-dehydrotetronate isomerase * : D-apiose isomerase * *No Wikipedia article EC 5.3.2: Interconverting Keto- and Enol-Groups : phenylpyruvate tautomerase : oxaloacetate tautomerase : TDP-4-oxo-6-deoxy-α-glucose-3,4-oxoisomerase (dTDP-3-dehydro-6-deoxy-α-D-galactopyranose-forming) : TDP-4-oxo-6-deoxy-α-D-glucose-3,4-oxoisomerase (dTDP-3-dehydro-6-deoxy-α-D-glucopyranose-forming) : 2,3-diketo-5-methylthiopentyl-1-phosphate enolase : 2-hydroxymuconate tautomerase : ascopyrone tautomerase : 4-oxalomesaconate tautomerase EC 5.3.3: Transposing C=C Bonds : steroid Δ-isomerase : isopentenyl-diphosphate Δ-isomerase : vinylacetyl-CoA Δ-isomerase : muconolactone Δ-isomerase : cholestenol Δ-isomerase : methylitaconate Δ-isomerase : aconitate Δ-isomerase : Δ3-Δ2-enoyl-CoA isomerase : prostaglandin-A1 Δ-isomerase : 5-carboxymethyl-2-hydroxymuconate Δ-isomerase : isopiperitenone Δ-isomerase : L-dopachrome isomerase : polyenoic fatty acid isomerase : trans-2-decenoyl-[acyl-carrier protein] isomerase : Now , ascopyrone tautomerase : Now , 4-oxalomesaconate tautomerase : trans-2,3-dihydro-3-hydroxyanthranilate isomerase : 2-(1,2-epoxy-1,2-dihydrophenyl)acetyl-CoA isomerase : 3-[(4R)-4-hydroxycyclohexa-1,5-dien-1-yl]-2-oxopropanoate isomerase * : Now , 2-hydroxyisobutanoyl-CoA mutase : Δ3,5-Δ2,4-dienoyl-CoA isomerase * : lutein isomerase * : S-methyl-5-thioribulose 1-phosphate isomerase * *No Wikipedia article EC 5.3.4: Transposing S-S Bonds : protein disulfide-isomerase EC 5.3.99: Other Intramolecular Oxidoreductases : deleted, reaction due to combined action of (hydroperoxide dehydratase) and (allene-oxide cyclase) : prostaglandin-D synthase : prostaglandin-E synthase :