1TKK:
reference: Evolution of enzymatic activities in the enolase superfamily: structure of a substrate-liganded complex of the L-Ala-D/L-Glu epimerase from Bacillus subtilis., Klenchin VA, Schmidt DM, Gerlt JA, Rayment I, Biochemistry 2004 Aug 17;43(32):10370-8. PMID: 15301535

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