_EC 1.5.5.- With a quinone or similar compound as acceptor. 18 PDB entries  
EC 1.-.-.- Oxidoreductases. [8,844 PDB entries]
EC 1.5.-.- Acting on the CH-NH group of donors. [619 PDB entries]
EC 1.5.5.- With a quinone or similar compound as acceptor. [18 PDB entries]    
EC 1.5.5.1 Electron-transferring-flavoprotein dehydrogenase. [2 PDB entries]
EC 1.5.5.2 Proline dehydrogenase. [16 PDB entries]