_EC 5.5.1.- Intramolecular lyases. 59 PDB entries  
EC 5.-.-.- Isomerases. [2,250 PDB entries]
EC 5.5.-.- Intramolecular lyases. [59 PDB entries]
EC 5.5.1.- Intramolecular lyases. [59 PDB entries]    
EC 5.5.1.1 Muconate cycloisomerase. [15 PDB entries]
EC 5.5.1.2 3-carboxy-cis,cis-muconate cycloisomerase. [4 PDB entries]
EC 5.5.1.3 Tetrahydroxypteridine cycloisomerase. [-]
EC 5.5.1.4 Inositol-3-phosphate synthase. [13 PDB entries]
EC 5.5.1.5 Carboxy-cis,cis-muconate cyclase. [1 PDB entries]
EC 5.5.1.6 Chalcone isomerase. [9 PDB entries]
EC 5.5.1.7 Chloromuconate cycloisomerase. [4 PDB entries]
EC 5.5.1.8 (+)-bornyl diphosphate synthase. [7 PDB entries]
EC 5.5.1.9 Cycloeucalenol cycloisomerase. [-]
EC 5.5.1.10 Alpha-pinene-oxide decyclase. [-]
EC 5.5.1.11 Dichloromuconate cycloisomerase. [-]
EC 5.5.1.12 Copalyl diphosphate synthase. [1 PDB entries]
EC 5.5.1.13 Ent-copalyl diphosphate synthase. [3 PDB entries]
EC 5.5.1.14 Syn-copalyl-diphosphate synthase. [-]
EC 5.5.1.15 Terpentedienyl-diphosphate synthase. [-]
EC 5.5.1.16 Halimadienyl-diphosphate synthase. [-]
EC 5.5.1.17 (S)-beta-macrocarpene synthase. [-]
EC 5.5.1.18 Lycopene epsilon-cyclase. [-]
EC 5.5.1.19 Lycopene beta-cyclase. [-]
EC 5.5.1.20 Prosolanapyrone-III cycloisomerase. [-]
EC 5.5.1.21 Transferred entry: 4.2.1.133. [-]
EC 5.5.1.22 (-)-bornyl diphosphate synthase. [-]
EC 5.5.1.23 Aklanonic acid methyl ester cyclase. [2 PDB entries]
EC 5.5.1.24 Tocopherol cyclase. [-]
EC 5.5.1.n1 D-ribose pyranase. [-]
EC 5.5.1.n2 Transferred entry: 5.5.1.19. [-]

[-] signifies that there are no PDB entries for the given enzyme subclass