This family contains several actinomycete proteins. Family members such as DciA (dna[CI] antecedent) found in Pseudomonas aeruginosa, has been shown to share a common function with DnaC (in Escherichia coli) and DnaI (in Bacillus subtilis), acting as a replicative helicase. Furthermore, functional analysis revealed that DciA is essential for replication initiation and protein depletion resulted in a blockage of the initiation of replication after the formation of the open complex [1].

1: DciA is an ancestral replicative helicase operator essential for bacterial replication initiation. Brezellec P, Vallet-Gely I, Possoz C, Quevillon-Cheruel S, Ferat JL; Nat Commun. 2016;7:13271. PMID:27830752