This uncharacterised domain was identified by Iyer and colleagues [1]. It is found associated with a helicase domain of superfamily type II.

1: MutL homologs in restriction-modification systems and the origin of eukaryotic MORC ATPases. Iyer LM, Abhiman S, Aravind L; Biol Direct. 2008;3:8. PMID:18346280