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The diiron(II) complex of soluble methane monooxygenase hydroxylase (sMMOHred) reacts with dioxygen and saturated hydrocarbons (RH) to give alcohols (ROH) and the resting diiron(III) state of the protein (sMMOHox). sMMOHox can be reduced back to sMMOHred by acquiring two electrons from a reductase protein (sMMOR). The active site structures of sMMOHred and sMMOHox are depicted.
