A predicted RNase toxin found in bacterial polymorphic toxin systems. The toxin possesses an all-beta fold and two conserved histidines present in an RxH and THIP motif. The domain additionally has a highly conserved arginine residue. In bacterial polymorphic toxin systems, the toxin is usually exported by the type 2, type 6 or type 7 secretion systems [1].

1: Polymorphic toxin systems: comprehensive characterization of trafficking modes, processing, mechanisms of action, immunity and ecology using comparative genomics. Zhang D, de Souza RF, Anantharaman V, Iyer LM, Aravind L; Biol Direct. 2012;7:18. PMID:22731697