This family includes NurA a nuclease exhibiting both single-stranded endonuclease activity and 5'-3' exonuclease activity on single-stranded and double-stranded DNA from the hyperthermophilic archaeon Sulfolobus acidocaldarius [2].

1: Comparative genomics of the FtsK-HerA superfamily of pumping ATPases: implications for the origins of chromosome segregation, cell division and viral capsid packaging. Iyer LM, Makarova KS, Koonin EV, Aravind L; Nucleic Acids Res. 2004;32:5260-5279. PMID:15466593

2: NurA, a novel 5'-3' nuclease gene linked to rad50 and mre11 homologs of thermophilic Archaea. Constantinesco F, Forterre P, Elie C; EMBO Rep. 2002;3:537-542. PMID:12052775