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Some of the multiple forms of 2-electron reduced Erv2p. The forms B–D have an oxidized flavin ring and various redox states of cysteine I–IV. CYS I is the one closest to the flavin and could participate as a charge-transfer donor and C4a adduct formation. CYS II can form an interchain disulfide bridge with the distal disulfide (here depicted as involving CYS III). Charge-transfer complex would only occur with the deprotonated thiolate form of CYS I in either of states B and C.
