6JIL:
reference: Cyclization mechanism catalyzed by an ATP-grasp enzyme essential for D-cycloserine biosynthesis., Matoba Y, Uda N, Kudo M, Sugiyama M, FEBS J. 2019 Dec 3. doi: 10.1111/febs.15163. PMID: 31793174

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