This conserved region is found in the C-terminal region of archaeal Nre proteins. While most archaeal organisms encode only a single Nre protein, some encode two, NreA and NreB.

1: A novel archaeal DNA repair factor that acts with the UvrABC system to repair mitomycin C-induced DNA damage in a PCNA-dependent manner. Giroux X, MacNeill SA; Mol Microbiol. 2016;99:1-14. PMID:26337406