| D | MNNL | e4xuuD1 | A: beta barrels | X: Anticodon-binding domain of Class II aaRS | H: Anticodon-binding domain of Class II aaRS | T: Anticodon-binding domain of Class II aaRS | F: MNNL | ECOD (v294.2) |
| C | MNNL | e4xuuC1 | A: beta barrels | X: Anticodon-binding domain of Class II aaRS | H: Anticodon-binding domain of Class II aaRS | T: Anticodon-binding domain of Class II aaRS | F: MNNL | ECOD (v294.2) |
| B | MNNL | e4xuuB1 | A: beta barrels | X: Anticodon-binding domain of Class II aaRS | H: Anticodon-binding domain of Class II aaRS | T: Anticodon-binding domain of Class II aaRS | F: MNNL | ECOD (v294.2) |
| A | Helicase_C | e4xuuA1 | A: beta barrels | X: OB-fold | H: Rossmann-related | T: FAD/NAD(P)-binding domain | F: Helicase_C | ECOD (v294.2) |