1RR9:
reference: The catalytic domain of E.coli Lon protease has a unique fold and a Ser-Lys dyad in the active site., Botos I, Melnikov EE, Cherry S, Tropea JE, Khalatova AG, Rasulova F, Dauter Z, Maurizi MR, Rotanova TV, Wlodawer A, Gustchina A, J Biol Chem 2003 Dec 9;. PMID: 14665623

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