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Enantioselectivity mechanism of DTD. A, crystal structure of DTD in complex with d-Tyr3AA (PDB entry 4NBI). The active site is at the dimeric interface (each monomer is colored differently). The ligand is shown in magenta, and the GP-motif is shown in green sticks. B, d-Tyr in the active site; the side chain projects out of the pocket, and the GP-motif forms the base. C, l-Tyr modeled in the active site, clearly showing the side chain clash with the GP-motif.
