May be a nuclease involved in DNA recombination and repair. Interacts with DNA processing enzymes, including the restriction complex HsdMRS, the integrases IntF and IntS, and the recombinase PinE. Possesses a PD-(D/E)XK-like nuclease domain. Deletion of this gene results in a synthetic-lethal phenotype when combined with hypomorphic alleles of the replicative primosome (dnaB), DNA polymerase III (dnaN), and DNA topoisomerase IV (parE).