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Proposed model for VciB function. Functional VciB forms a dimeric structure in the inner membrane. Electrons from the electron transport chain, either from the Na+-NQR (shown) or oxidation of other energy sources by other electron transport chain (ETC) constituents, are passed from VciB to Fe3+ to result in reduction to Fe2+. It is not clear at this time if VciB directly mediates iron reduction.
