| Q56220 | n/a | 3i9v | MN | 4 | 411 | e3i9v41 | alpha-helical domain in nickel-iron hydrogenase, large subunit | alpha-helical domain in nickel-iron hydrogenase, large subunit | alpha-helical domain in nickel-iron hydrogenase, large subunit | Complex1_49kDa |
| Q56220 | n/a | 3i9v | MN | 4 | 411 | e3i9v42 | FAD-linked reductases, C-terminal domain-like | Ni-Fe binding domain in nickel-iron hydrogenase large subunit | Ni-Fe binding domain in nickel-iron hydrogenase large subunit | Complex1_49kDa |
| Q56220 | n/a | 3i9v | MN | 7 | 202 | e3i9v43 | FAD-linked reductases, C-terminal domain-like | Ni-Fe binding domain in nickel-iron hydrogenase large subunit | Ni-Fe binding domain in nickel-iron hydrogenase large subunit | Complex1_49kDa |
| Q56220 | n/a | 3i9v | MN | D | 410 | e3i9vD6 | alpha-helical domain in nickel-iron hydrogenase, large subunit | alpha-helical domain in nickel-iron hydrogenase, large subunit | alpha-helical domain in nickel-iron hydrogenase, large subunit | Complex1_49kDa |
| Q56220 | n/a | 3i9v | MN | H | 202 | e3i9vD4 | FAD-linked reductases, C-terminal domain-like | Ni-Fe binding domain in nickel-iron hydrogenase large subunit | Ni-Fe binding domain in nickel-iron hydrogenase large subunit | Complex1_49kDa |