This presumed domain is found in bacteria, and is approximately 60 amino acids in length. Structure prediction suggests that it has a ribbon-helix-helix motif, a DNA-binding motif commonly found in antitoxin families [1,2]. Members containing this domain may be related to CopG antitoxin family.

1: The structure of plasmid-encoded transcriptional repressor CopG unliganded and bound to its operator. Gomis-R th FX, Sol M, Acebo P, Parraga A, Guasch A, Eritja R, Gonzalez A, Espinosa M, del Solar G, Coll M EMBO J 1998;17:7404-7415. PMID:9857196

2: Prokaryotic toxin-antitoxin stress response loci. Gerdes K, Christensen SK, Lobner-Olesen A; Nat Rev Microbiol. 2005;3:371-382. PMID:15864262