1KAN:
reference: Molecular structure of kanamycin nucleotidyltransferase determined to 3.0-A resolution., Sakon J, Liao HH, Kanikula AM, Benning MM, Rayment I, Holden HM, Biochemistry 1993 Nov 16;32(45):11977-84. PMID: 8218273

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