This region is found in the replication initiator protein RctB from Vibrio cholerae (Swiss:Q9KNG2) and similar sequences predominantly found in Vibrionales. RctB mediates oriCII-based replication and other regulatory processes. This protein is organised into four domains and adopts a dimeric configuration. This entry represents the two central domains, one consisting of a seven-stranded beta- sheet that forms the interface of the dimer by forming a swapped configuration with the same domain of the other monomer. It seems to be involved in DNA binding [1].

1: The replication initiator of the cholera pathogen's second chromosome shows structural similarity to plasmid initiators. Orlova N, Gerding M, Ivashkiv O, Olinares PDB, Chait BT, Waldor MK, Jeruzalmi D; Nucleic Acids Res. 2017;45:3724-3737. PMID:28031373