_EC 1.2.3.- With oxygen as acceptor. 47 PDB entries  
EC 1.-.-.- Oxidoreductases. [21,435 PDB entries]
EC 1.2.-.- Acting on the aldehyde or oxo group of donors. [1,276 PDB entries]
EC 1.2.3.- With oxygen as acceptor. [47 PDB entries]
EC 1.2.3.1 aldehyde oxidase. [9 PDB entries]
EC 1.2.3.2 Transferred entry: 1.17.3.2. [-]
EC 1.2.3.3 pyruvate oxidase. [11 PDB entries]
EC 1.2.3.4 oxalate oxidase. [5 PDB entries]
EC 1.2.3.5 glyoxylate oxidase. [21 PDB entries]
EC 1.2.3.6 pyruvate oxidase (CoA-acetylating). [-]
EC 1.2.3.7 indole-3-acetaldehyde oxidase. [-]
EC 1.2.3.8 pyridoxal oxidase. [1 PDB entries]
EC 1.2.3.9 aryl-aldehyde oxidase. [-]
EC 1.2.3.10 Deleted entry. [-]
EC 1.2.3.11 Transferred entry: 1.2.3.1. [-]
EC 1.2.3.12 Transferred entry: 1.14.13.82. [-]
EC 1.2.3.13 4-hydroxyphenylpyruvate oxidase. [-]
EC 1.2.3.14 abscisic-aldehyde oxidase. [-]
EC 1.2.3.15 (methyl)glyoxal oxidase. [-]

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