Involved in DNA damage repair. Works together with the UvrABC proteins in repairing DNA damage resulting from exposure to the DNA damaging agent mitomycin C (MMC). Interacts with the DNA polymerase sliding clamp (PCNA) via the PIP (PCNA-interacting peptide) motif. Non-essential, but cells lacking this gene are sensitive to DNA damage induced by treatment with MMC. Does not display increased sensitivity to UV light or to the alkylating agent methyl methanesulphonate (MMS). Belongs to the Nre family.