Eubacterial DnaG primases interact with several factors to from the replisome. One of these factors in DnaB, a helicase. This domain has been demonstrated to be responsible for the interaction between DnaG and DnaB[1].

1: Identification of a domain of Escherichia coli primase required for functional interaction with the DnaB helicase at the replication fork. Tougu K, Peng H, Marians KJ; J Biol Chem 1994;269:4675-4682. PMID:8308039