_EC 5.3.2.- Interconverting keto- and enol- groups. 68 PDB entries  
EC 5.-.-.- Isomerases. [2,272 PDB entries]
EC 5.3.-.- Intramolecular oxidoreductases. [867 PDB entries]
EC 5.3.2.- Interconverting keto- and enol- groups. [68 PDB entries]    
EC 5.3.2.1 Phenylpyruvate tautomerase. [50 PDB entries]
EC 5.3.2.2 Oxaloacetate tautomerase. [-]
EC 5.3.2.3 TDP-4-oxo-6-deoxy-alpha-D-glucose-3,4-oxoisomerase (dTDP-3-dehydro-6- [4 PDB entries]
EC 5.3.2.4 TDP-4-oxo-6-deoxy-alpha-D-glucose-3,4-oxoisomerase (dTDP-3-dehydro-6- [-]
EC 5.3.2.5 2,3-diketo-5-methylthiopentyl-1-phosphate enolase. [6 PDB entries]
EC 5.3.2.6 2-hydroxymuconate tautomerase. [8 PDB entries]
EC 5.3.2.7 Ascopyrone tautomerase. [-]
EC 5.3.2.8 4-oxalomesaconate tautomerase. [-]
EC 5.3.2.n1 Transferred entry: 5.3.2.5. [-]

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