4AHQ:
reference: Structural Insights into the Recovery of Aldolase Activity in N-Acetylneuraminic Acid Lyase by Replacement of the Catalytically Active Lysine with gamma-Thialysine by Using a Chemical Mutagenesis Strategy., Timms N, Windle CL, Polyakova A, Ault JR, Trinh CH, Pearson AR, Nelson A, Berry A, Chembiochem. 2013 Mar 4;14(4):474-81. doi: 10.1002/cbic.201200714. Epub 2013 Feb , 18. PMID: 23418011

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