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Green sticks indicate Cα trace of amino acids involved in the active site and CPK (Corey-Pauling-Koltun) coloring scheme represents ligand GalNAc (N acetyl galactosamine) portion of GM2 ganglioside. Fig 4a: Wild type (αHex-A-GalNAc complex). Fig 4b: Mutant (αD322N-GalNAc), Red shows mutation p.D322N, Fig 4c: Mutant (αD322Y-GalNAc), Cyan shows mutation p.D322Y, Fig. 4d: Mutant (α E462V-GalNAc), yellow shows mutation p.E462Y.
