This family represents the N-terminus (approximately 120 residues) of bacterial primosomal DnaI proteins, although one family member appears to be of viral origin. DnaI is one of the components of the Bacillus subtilis replication restart primosome, and is required for the DnaB75-dependent loading of the DnaC helicase [1].

1: DnaB, DnaD and DnaI proteins are components of the Bacillus subtilis replication restart primosome. Bruand C, Farache M, McGovern S, Ehrlich SD, Polard P; Mol Microbiol 2001;42:245-255. PMID:11679082