Urease () :Category:EC 3.5.2 (In cyclic amides) Beta-lactamase () :Category:EC 3.5.3 (In linear amidines) Arginase () :Category:EC 3.5.4 (In cyclic amidines) Adenosine deaminase () GTP cyclohydrolase I () :Category:EC 3.5.5 (In nitriles) Nitrilase () :Category:EC 3.6 (act on acid anhydrides) :Category:EC 3.6.1 Helicase DnaB helicase RecQ helicase :Category:EC 3.6.3 ATPase NaKATPase () ATP synthase () :Category:EC 3.7 (act on carbon–carbon bonds) Kynureninase :Category:EC 3.8 (act on halide bonds) EC 3.8.1.3 Haloacetate dehalogenase :Category:EC 3.9 (act on phosphorus–nitrogen bonds) : Phosphoamidase : Protein arginine phosphatase : Phosphohistidine phosphatase :Category:EC 3.10 (act on sulfur–nitrogen bonds) : N-sulfoglucosamine sulfohydrolase : Cyclamate sulfohydrolase :Category:EC 3.11 (act on carbon–phosphorus bonds) : Phosphonoacetaldehyde hydrolase : Phosphonoacetate hydrolase : Phosphonopyruvate hydrolase :Category:EC 3.12 (act on sulfur–sulfur bonds) : Trithionate hydrolase :Category:EC 3.13 (act on carbon–sulfur bonds) : UDP-sulfoquinovose synthase : 2'-hydroxybiphenyl-2-sulfinate desulfinase : 3-sulfinopropanoyl—CoA desulfinase : Carbon disulfide hydrolase : (CysO sulfur-carrier protein)-S-L-cysteine hydrolase : Carbonyl sulfide hydrolase : S-adenosyl-L-methionine hydrolase (adenosine-forming) :Category:Lyases (EC 4) (Lyase) :Category:EC 4.1 (carbon–carbon lyases) :Category:EC 4.1.1 Ornithine decarboxylase () Uridine monophosphate synthetase () Aromatic-L-amino-acid decarboxylase () RubisCO () :Category:EC 4.1.2 Fructose-bisphosphate aldolase () :Category:EC 4.2 (carbon–oxygen lyases) :Category:EC 4.2.1 Carbonic anhydrase () Tryptophan synthase () :Category:EC 4.3 (carbon–nitrogen lyases) :Category:EC 4.3.1 Phenylalanine ammonia-lyase () :Category:EC 4.4 (carbon–sulfur lyases) :Category:EC 4.4.1 Cystathionine gamma-lyase Cystathionine beta-lyase Leukotriene C4 synthase :Category:EC 4.5 (carbon–halide lyases) :Category:EC 4.5.1 Dichloromethane dehalogenase Halohydrin dehalogenase :Category:EC 4.6 (phosphorus–oxygen lyases) :Category:EC 4.6.1 Adenylate cyclase () Guanylate cyclase () :Category:Isomerases (EC 5) (Isomerase) :Category:EC 5.1 (racemases and epimerases) :Category:EC 5.1.1 Amino-acid racemase: Phenylalanine racemase (ATP-hydrolysing) Serine racemase :Category:EC 5.1.2 Mandelate racemase :Category:EC 5.1.3 UDP-glucose 4-epimerase :Category:EC 5.1.99 Methylmalonyl CoA epimerase :Category:EC 5.2 (cis-trans-isomerases) :Category:EC 5.2 FKBP: FKBP1A FKBP1B FKBP2 FKBP3 FKBP4 FKBP5 FKBP6 FKBP8 FKBP9 FKBP10 FKBPL Cyclophilin Parvulin Prolyl isomerase 2-chloro-4-carboxymethylenebut-2-en-1,4-olide isomerase Beta-carotene isomerase Farnesol 2-isomerase Furylfuramide isomerase Linoleate isomerase Maleate isomerase Maleylacetoacetate isomerase Maleylpyruvate isomerase Parvulin Photoisomerase Prolycopene isomerase Prolyl isomerase Retinal isomerase Retinol isomerase Zeta-carotene isomerase :Category:EC 5.3 (intramolecular oxidoreductases) :Category:EC 5.3.3 Enoyl CoA isomerase () :Category:EC 5.3.4 Protein disulfide isomerase () :Category:EC 5.4 (intramolecular transferases -- mutases) :Category:EC 5.4.2 Phosphoglucomutase () :Category:EC 5.5 (intramolecular lyases) :Category:EC 5.99 (other isomerases) :Category:EC 5.99.1 Topoisomerase (type I: , type II: ) :Category:Ligases (EC 6) (Ligase) :Category:EC 6.1 (form carbon–oxygen bonds) 6-carboxytetrahydropterin synthase :Category:EC 6.1.1 FARSB () :Category:EC 6.2 (form carbon–sulfur bonds) : Acetate—CoA ligase : Medium-chain acyl—CoA ligase : Long-chain-fatty-acid—CoA ligase : Succinate—CoA ligase (GDP-forming) : Succinate—CoA ligase (ADP-forming) :