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Schematic representation of the d-Ala:d-Ala ligase of E. faecalis. The positions of the amino acids implicated in the binding of d-Ala1, d-Ala2, and ATP are indicated by black, dotted, and hatched bars, respectively. Substitutions relative to the deduced DDl sequence of TJ282 (and the corresponding mutations in parentheses) are indicated in bold italic characters.
