A predicted RNase toxin found in bacterial polymorphic toxin systems. The toxin possesses a most all-alpha helical fold and a conserved HxxD motif. In bacterial polymorphic toxin systems, the toxin is usually exported by the type 2, type 6, type 7 or Photorhabdus virulence cassette (PVC)-type secretion systems [1]. This is shown to be a type IV secretion system protein that behaves as DNase [2].

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

2: Agrobacterium tumefaciens deploys a superfamily of type VI secretion DNase effectors as weapons for interbacterial competition in planta. Ma LS, Hachani A, Lin JS, Filloux A, Lai EM; Cell Host Microbe. 2014;16:94-104. PMID:24981331