5YU4:
reference: Structural Basis for Recognition of L-lysine, L-ornithine, and L-2,4-diamino Butyric Acid by Lysine Cyclodeaminase., Min K, Yoon HJ, Matsuura A, Kim YH, Lee HH, Mol Cells. 2018 Apr 30;41(4):331-341. doi: 10.14348/molcells.2018.2313. Epub 2018, Apr 5. PMID: 29629557

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