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Overall structure of the active site. Positions of the side chains and metals are well preserved in all structures, regardless of the mutation. The structures also contain a covalently attached PO3 group on S84 and a water molecule attached to M1 in a position suitable for hydrolyzing the PO3-S84 bond. Structures are colored as follows: H135D-2Zn2+Mg2+-TAP in pale wheat, H135D-3Zn2+-TAP in green, H135E-TAP in red, and the wtTAP9 in white.
