2Z7K:
reference: Crystal structure analysis and in silico pKa calculations suggest strong pKa shifts of ligands as driving force for high-affinity binding to TGT., Ritschel T, Hoertner S, Heine A, Diederich F, Klebe G, Chembiochem. 2009 Mar 2;10(4):716-27. PMID: 19199329

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