| TCID | Name | Organismal Type | Example |
|---|---|---|---|
| 3.D.2.1.1 | H+-translocating transhydrogenase | Bacteria | α2β2 heterotetrameric PTH of E. coli |
| 3.D.2.2.1 | H+-translocating transhydrogenase | Bacteria | (α1)2(α2)2β2 heterohexameric PTH of Rhodospirillum rubrum |
| 3.D.2.3.1 | H+-translocating transhydrogenase | Animals | Homodimeric PTH of Bos taurus |
| 3.D.2.4.1 | H+-translocating transhydrogenase | Eukaryotic protista | PTH of Eimeria tenella |
