DNA-dependent ATPase and 5'-3' DNA helicase (By similarity). Involved in the repair of replication forks and tolerance of the chain-terminating nucleoside analog 3' azidothymidine (AZT). May unwind potentially damaged 3' nascent ends such as those terminated by AZT, promote repair and AZT excision (PubMed:26544712). ATP + H2O = ADP + H(+) + phosphate Binds 1 [4Fe-4S] cluster. Interacts with the DNA polymerase III subunit Chi (holC). Knockout mutants are sensitive to AZT. Belongs to the helicase family. DinG subfamily.