The MopB_CT_DmsA-EC CD includes the DmsA enzyme of the dmsABC operon encoding the anaerobic dimethylsulfoxide reductase (DMSOR) of Escherichia coli and other related DMSOR-like enzymes. Unlike other DMSOR-like enzymes, this group has a predicted N-terminal iron-sulfur [4Fe-4S] cluster binding site. This CD is of the conserved molybdopterin_binding C-terminal (MopB_CT) region present in many, but not all, MopB homologs.