3LWB:
reference: Structure of the Mycobacterium tuberculosis D-alanine:D-alanine Ligase: a target of the anti-tuberculosis drug D-cycloserine., Bruning JB, Murillo AC, Chacon O, Barletta RG, Sacchettini JC, Antimicrob Agents Chemother. 2010 Oct 18. PMID: 20956591

This OCA Structure page
uses Jmol, developed by the Jmol Development Team (documentation).