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Comparison of the Tris binding site in the open conformation to the tripeptide binding site in the closed conformation. Domain 2 of the open conformation of MppA (PDB ID 4TOZ, red bonds) was superposed on the equivalent alpha carbons of the closed conformation (PDB ID 3O9P, blue bonds). The Tris buffer molecule (purple bonds) superposes near the L-alanyl moiety of the tripeptide (green bonds).
