- A: a+b complex topology
- X: Uridine diphospho-N-Acetylenolpyruvylglucosamine reductase, MurB, C-terminal domain
- H: Uridine diphospho-N-Acetylenolpyruvylglucosamine reductase, MurB, C-terminal domain
- T: Uridine diphospho-N-Acetylenolpyruvylglucosamine reductase, MurB, C-terminal domain
- F: MurB_C