1KN9:
reference: Crystal structure of a bacterial signal peptidase apoenzyme: implications for signal peptide binding and the Ser-Lys dyad mechanism., Paetzel M, Dalbey RE, Strynadka NC, J Biol Chem 2002 Mar 15;277(11):9512-9. PMID: 11741964

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