_EC 5.3.1.- Interconverting aldoses and ketoses, and related compounds. 482 PDB entries  
EC 5.-.-.- Isomerases. [2,270 PDB entries]
EC 5.3.-.- Intramolecular oxidoreductases. [862 PDB entries]
EC 5.3.1.- Interconverting aldoses and ketoses, and related compounds. [482 PDB entries]    
EC 5.3.1.1 Triose-phosphate isomerase. [168 PDB entries]
EC 5.3.1.2 Deleted entry. [-]
EC 5.3.1.3 D-arabinose isomerase. [1 PDB entries]
EC 5.3.1.4 L-arabinose isomerase. [4 PDB entries]
EC 5.3.1.5 Xylose isomerase. [100 PDB entries]
EC 5.3.1.6 Ribose-5-phosphate isomerase. [40 PDB entries]
EC 5.3.1.7 Mannose isomerase. [-]
EC 5.3.1.8 Mannose-6-phosphate isomerase. [10 PDB entries]
EC 5.3.1.9 Glucose-6-phosphate isomerase. [75 PDB entries]
EC 5.3.1.10 Transferred entry: 3.5.99.6. [1 PDB entries]
EC 5.3.1.11 Deleted entry. [-]
EC 5.3.1.12 Glucuronate isomerase. [3 PDB entries]
EC 5.3.1.13 Arabinose-5-phosphate isomerase. [3 PDB entries]
EC 5.3.1.14 L-rhamnose isomerase. [7 PDB entries]
EC 5.3.1.15 D-lyxose ketol-isomerase. [-]
EC 5.3.1.16 1-(5-phosphoribosyl)-5- [18 PDB entries]
EC 5.3.1.17 5-dehydro-4-deoxy-D-glucuronate isomerase. [3 PDB entries]
EC 5.3.1.18 Deleted entry. [-]
EC 5.3.1.19 Transferred entry: 2.6.1.16. [-]
EC 5.3.1.20 Ribose isomerase. [-]
EC 5.3.1.21 Corticosteroid side-chain-isomerase. [-]
EC 5.3.1.22 Hydroxypyruvate isomerase. [2 PDB entries]
EC 5.3.1.23 S-methyl-5-thioribose-1-phosphate isomerase. [8 PDB entries]
EC 5.3.1.24 Phosphoribosylanthranilate isomerase. [15 PDB entries]
EC 5.3.1.25 L-fucose isomerase. [7 PDB entries]
EC 5.3.1.26 Galactose-6-phosphate isomerase. [-]
EC 5.3.1.27 6-phospho-3-hexuloisomerase. [3 PDB entries]
EC 5.3.1.28 D-sedoheptulose 7-phosphate isomerase. [8 PDB entries]
EC 5.3.1.29 Ribose 1,5-bisphosphate isomerase. [3 PDB entries]
EC 5.3.1.30 5-deoxy-glucuronate isomerase. [-]
EC 5.3.1.31 Sulfoquinovose isomerase. [3 PDB entries]
EC 5.3.1.n1 Transferred entry: 5.3.1.30. [-]
EC 5.3.1.n2 Transferred entry: 5.3.1.29. [-]

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