1XA1:
reference: Crystal structures of the Apo and penicillin-acylated forms of the BlaR1 beta-lactam sensor of Staphylococcus aureus., Wilke MS, Hills TL, Zhang HZ, Chambers HF, Strynadka NC, J Biol Chem 2004 Nov 5;279(45):47278-87. Epub 2004 Aug 18. PMID: 15322076

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