Essential for efficient chromosomal DNA transformation but not required for plasmid transformation (PubMed:7768823). Its disruption can be partially complemented by the smf gene of E.coli (PubMed:16978360). 2,000-fold decrease in transformation efficiency (PubMed:7768823, PubMed:16978360). Cells take up DNA but are defective in a later stage of chromosomal DNA transformation (PubMed:7768823). Belongs to the DprA/Smf family.