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(Upper) Crystallographic structure of SAM bound to the [4Fe–4S] cluster in SPL (left: 4fhf.pdb), which undergoes photochemical liberation of 5′-dAdo·, and in HydE (right: 3iiz.pdb), which undergoes photochemical liberation of ·CH3. (Lower) Overlay of the two structures. Together, the figures show nearly identical positioning and orientation of the sulfonium center with respect to the unique Fe of the [4Fe–4S] cluster.
