_EC 1.12.98.- With other, known, acceptors. 30 PDB entries  
EC 1.-.-.- Oxidoreductases. [21,435 PDB entries]
EC 1.12.-.- Acting on hydrogen as donors. [251 PDB entries]
EC 1.12.98.- With other, known, acceptors. [30 PDB entries]
EC 1.12.98.1 coenzyme F420 hydrogenase. [10 PDB entries]
EC 1.12.98.2 5,10-methenyltetrahydromethanopterin hydrogenase. [18 PDB entries]
EC 1.12.98.3 Methanosarcina-phenazine hydrogenase. [-]
EC 1.12.98.4 sulfhydrogenase. [2 PDB entries]

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