1.8.5.6 cytoplasm subunits SoeA and SoeB are located in the cytoplasm and attached to the cytoplasmic membrane by interaction with subunit SoeC 5737 -, 739014 1.8.5.6 membrane the enzyme is membrane-bound and quinone reactive (via the SoeC subunit), facing the cytoplasm where SoeB (a module that carries FeeS centers) and the SoeA (the Mo-carrying catalytic subunit) are exposed. The enzyme is a large membrane-bound complex, formerly called SreABC 16020 764198