| P31892 | n/a | 4iub | S3F | S | 1003 | e4iubS1 | Fe-S cluster-binding domain in nickel-iron hydrogenase small subunit | Fe-S cluster-binding domain in nickel-iron hydrogenase small subunit | Fe-S cluster-binding domain in nickel-iron hydrogenase small subunit | NiFe_hyd_SSU_C |
| P31892 | n/a | 4iub | S3F | S | 1003 | e4iubS2 | Flavodoxin-like | Class I glutamine amidotransferase-like | CheY-like | Oxidored_q6 |
| P31892 | n/a | 4iuc | S3F | S | 1003 | e4iucS1 | Fe-S cluster-binding domain in nickel-iron hydrogenase small subunit | Fe-S cluster-binding domain in nickel-iron hydrogenase small subunit | Fe-S cluster-binding domain in nickel-iron hydrogenase small subunit | NiFe_hyd_SSU_C |
| P31892 | n/a | 4iuc | S3F | S | 1003 | e4iucS2 | Flavodoxin-like | Class I glutamine amidotransferase-like | CheY-like | Oxidored_q6 |
| P31892 | n/a | 4iud | S3F | S | 1003 | e4iudS1 | Fe-S cluster-binding domain in nickel-iron hydrogenase small subunit | Fe-S cluster-binding domain in nickel-iron hydrogenase small subunit | Fe-S cluster-binding domain in nickel-iron hydrogenase small subunit | NiFe_hyd_SSU_C |
| P31892 | n/a | 4iud | S3F | S | 1003 | e4iudS2 | Flavodoxin-like | Class I glutamine amidotransferase-like | CheY-like | Oxidored_q6 |