6CYK:
reference: Synergistic effects of functionally distinct substitutions in beta-lactamase variants shed light on the evolution of bacterial drug resistance., Patel MP, Hu L, Brown CA, Sun Z, Adamski CJ, Stojanoski V, Sankaran B, Prasad BVV, Palzkill T, J Biol Chem. 2018 Oct 1. pii: RA118.003792. doi: 10.1074/jbc.RA118.003792. PMID: 30275013

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