2.8.1.15	[4Fe-4S]-center	TtuA requires oxygen-labile [4Fe-4S]-type iron (Fe)-S clusters for its enzymatic activity. The [4Fe-4S] cluster is coordinated by three highly conserved cysteine residues, and one of the Fe atoms is exposed to the active site. The cluster is coordinated by conserved residues Cys130, Cys133, and Cys222	741346