Comparison of YuaF and PH0471 structures. Superposition of the C-terminal domain of YuaF from B. subtilis as determined by NMR (PDB entry 2K12)  with the NfeD homolog PH0471 from P. horikoshii (PDB code: 2EXD). β-sheets are blue, the N-terminal α-helix of YuaF is red. Random coil regions are yellow. Both protein domains display a striking similarity in their β-barrel cores.