1.8.98.1	Fe	the purified catalytic subunit HrdD contains 7.0 mol non-heme iron per mol monomer	742500	
1.8.98.1	Fe2+	[2Fe-2S] cluster core with complete cysteinyl ligation in center C, sensitive to dithionite	680622	
1.8.98.1	Iron	1 mol H2: heterodisulfide oxidoreductase complex with MW 250000 Da contains approximately 26 mol non-heme iron	655398	
1.8.98.1	Iron	active-site [4Fe-4S] cluster that is directly involved in mediating heterodisulfide reduction	655551	
1.8.98.1	Iron	coenzyme M binds to a [4Fe-4S] cluster in the active site	655568, 667866	
1.8.98.1	Iron	contains an active-site [4Fe-4S] cluster that is directly involved in mediating heterodisulfide reduction	655593	
1.8.98.1	Iron	contains two [Fe4S4] clusters. Only the low spin heme and the high potential FeS cluster are involved in reduction of N-(7-[(2-sulfoethyl)dithio]heptanoyl)-3-O-phospho-L-threonine. A 4 Fe cluster is the initial electron acceptor	639394	
1.8.98.1	Iron	the C-terminal CCG domain of the subunit B of heterodisulfide binds to the [4Fe-4S]3+ cluster	685106	
1.8.98.1	Iron	the enzyme contains 280 nmol of non-heme iron per mg of protein	655400	
1.8.98.1	Iron	the enzyme contains two distinct [Fe4S4]2+/1+ clusters in the large subunit	639393