cytochrome c
c-type cytochrome SorU, i.e. Smc04048
cytochrome c-551
intimately associated with the enzyme
cytochrome c-551
MW 23000 Da, necessary for the enzyme as an integral part
cytochrome c550
enzyme reacts exclusively with cytochrome c550
FAD
enzyme covalently binds one FAD
heme
0.91 heme c per holoenzyme
heme
contains b-type heme