Tertiary structure (b) of MMOR. The gray-colored regions in (a – d) were removed from the native structure for constructing the sMMO miniatures (mini-sMMOs). The gray region in (a, b) indicates the ferredoxin domain, while the remaining cyan region represents the FAD domain. The FAD domain of MMOR (defined as RFAD) in (a, b) are included in the mini-sMMOs.
