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Cycloserine works as an antibiotic by inhibiting cell-wall biosynthesis in bacteria.   As a cyclic analogue of D -alanine , cycloserine acts against two crucial enzymes important in the cytosolic stages of peptidoglycan synthesis: alanine racemase (Alr) and D -alanine: D -alanine ligase (Ddl).  The first enzyme is a pyridoxal 5'-phosphate-dependent enzyme which converts the L -alanine to the D -alanine form.  The second enzyme is involved in joining two of these D -alanine residues together by catalyzing the formation of the ATP -dependent D -alanine- D -alanine dipeptide bond between the resulting D -alanine molecules.  If both of these enzymes are inhibited, then D -alanine residues cannot form and previously formed D -alanine molecules cannot be joined together.  This effectively leads to inhibition of peptidoglycan synthesis.