_EC 1.2.99.- With other acceptors. 34 PDB entries  
EC 1.-.-.- Oxidoreductases. [8,010 PDB entries]
EC 1.2.-.- Acting on the aldehyde or oxo group of donors. [471 PDB entries]
EC 1.2.99.- With other acceptors. [34 PDB entries]    
EC 1.2.99.1 Transferred entry: 1.17.99.4. [-]
EC 1.2.99.2 Carbon-monoxide dehydrogenase (acceptor). [26 PDB entries]
EC 1.2.99.3 Aldehyde dehydrogenase (pyrroloquinoline-quinone). [-]
EC 1.2.99.4 Formaldehyde dismutase. [1 PDB entries]
EC 1.2.99.5 Formylmethanofuran dehydrogenase. [-]
EC 1.2.99.6 Carboxylate reductase. [-]
EC 1.2.99.7 Aldehyde dehydrogenase (FAD-independent). [7 PDB entries]
EC 1.2.99.8 Glyceraldehyde dehydrogenase (FAD-containing). [-]

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