1A3G:
reference: Three-dimensional structure of Escherichia coli branched-chain amino acid aminotransferase at 2.5 A resolution., Okada K, Hirotsu K, Sato M, Hayashi H, Kagamiyama H, J Biochem (Tokyo) 1997 Apr;121(4):637-41. PMID: 9163511

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