|  | Class c: Alpha and beta proteins (a/b) [51349] (130 folds) | 
|  | Fold c.59: MurD-like peptide ligases, peptide-binding domain [53243] (1 superfamily) 3 layers: a/b/a; mixed beta-sheet of 6 strands, order 126345; strand 1 is antiparallel to the rest | 
|  | Superfamily c.59.1: MurD-like peptide ligases, peptide-binding domain [53244] (2 families)  | 
|  | c.59.1.1: MurCDEF C-terminal domain [53245] (4 proteins) | 
|  | c.59.1.2: Folylpolyglutamate synthetase, C-terminal domain [53250] (1 protein) | 
Timeline for Superfamily c.59.1: MurD-like peptide ligases, peptide-binding domain: