4KG4:
reference: Active Site Conformational Dynamics Are Coupled to Catalysis in the mRNA Decapping Enzyme Dcp2., Aglietti RA, Floor SN, McClendon CL, Jacobson MP, Gross JD, Structure. 2013 Jul 31. pii: S0969-2126(13)00245-1. doi:, 10.1016/j.str.2013.06.021. PMID: 23911090

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