A predicted nuclease of the HNH/EndoVII superfamily of the treble clef fold which is closely related to the NucA-like family. The name is derived from the conserved G, H and E residues. It is found in several bacterial polymorphic toxin systems [1]. Some GH-E members preserve the conserved cysteines of the treble-clef suggesting that they might represent potential evolutionary intermediates from a classical HNH domain to the derived NucA-like form [1].

1: A novel immunity system for bacterial nucleic acid degrading toxins and its recruitment in various eukaryotic and DNA viral systems. Zhang D, Iyer LM, Aravind L; Nucleic Acids Res. 2011;39:4532-4552. PMID:21306995