Structure-based Design of a New Inhibitor for D-alanine:D-alanine Ligase: Isabelle Tytgat, Stéphane Vandevuer, Isabelle Ortmans, Finton Sirockin, Evelina Colacino, Françoise Van Bambeke, Jacques H. Poupaert, Paul M. Tulkens, Annick Dejaegere, Martine Prévost