This of family of predicted proteins represents the N-terminus (approximately 80 residues) of replication initiator protein A (RepA), a DNA replication initiator in plasmids. Most proteins in this family are bacterial, but archaeal and eukaryotic members are also included [1].

1: Structural changes in RepA, a plasmid replication initiator, upon binding to origin DNA. Diaz-Lopez T, Lages-Gonzalo M, Serrano-Lopez A, Alfonso C, Rivas G, Diaz-Orejas R, Giraldo R; J Biol Chem 2003;278:18606-18616. PMID:12637554