| Class d: Alpha and beta proteins (a+b) [53931] (376 folds) | 
| Fold d.224: SufE/NifU [82648] (1 superfamily) alpha(2)-beta(3)-alpha(3); 2 layers alpha/beta, 3-stranded antiparallel beta-sheet; order 123  | 
Superfamily d.224.1: SufE/NifU [82649] (4 families) ![]() iron-sulfur cluster assembly proteins  | 
| d.224.1.1: SufE-like [82650] (3 proteins) Fe-S metabolism associated domain automatically mapped to Pfam PF02657  | 
| d.224.1.2: NifU/IscU domain [102928] (4 proteins) | 
| d.224.1.3: SP1160 C-terminal domain-like [143216] (2 proteins) automatically mapped to Pfam PF10437  | 
| d.224.1.0: automated matches [191547] (1 protein) not a true family  | 
Timeline for Superfamily d.224.1: SufE/NifU: