5UBD:
reference: The replication initiator of the cholera pathogen's second chromosome shows structural similarity to plasmid initiators., Orlova N, Gerding M, Ivashkiv O, Olinares PD, Chait BT, Waldor MK, Jeruzalmi D, Nucleic Acids Res. 2016 Dec 27. pii: gkw1288. doi: 10.1093/nar/gkw1288. PMID: 28031373

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