Mostly alpha helical. Fused to HEPN (MAE_28990 superfamily), RES domain, a potential RNase found in various toxin systems [1].

1: Comprehensive analysis of the HEPN superfamily: identification of novel roles in intra-genomic conflicts, defense, pathogenesis and RNA processing. Anantharaman V, Makarova KS, Burroughs AM, Koonin EV, Aravind L; Biol Direct. 2013;8:15. PMID:23768067