4PTA:
reference: Mechanism of staphylococcal multiresistance plasmid replication origin assembly by the RepA protein., Schumacher MA, Tonthat NK, Kwong SM, Chinnam NB, Liu MA, Skurray RA, Firth N, Proc Natl Acad Sci U S A. 2014 Jun 9. pii: 201406065. PMID: 24927575

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