This bacterial domain is found at the C-terminus of Exodeoxyribonuclease I/Exonuclease I (Pfam:PF00929), which is a single-strand specific DNA nuclease affecting recombination and expression pathways. The exonuclease I protein in E. coli is associated with DNA deoxyribophosphodiesterase (dRPase) [1].

1: DNA deoxyribophosphodiesterase of Escherichia coli is associated with exonuclease I. Sandigursky M, Franklin WA; Nucleic Acids Res 1992;20:4699-4703. PMID:1329027