5KMT:
reference: Predicting allosteric mutants that increase activity of a major antibiotic resistance enzyme., Latallo MJ, Cortina GA, Faham S, Nakamoto RK, Kasson PM, Chem Sci. 2017 Sep 1;8(9):6484-6492. doi: 10.1039/c7sc02676e. Epub 2017 Jul 19. PMID: 28989673

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