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AHH domain-containing protein
AHH is a predicted nuclease of the HNH/ENDO VII superfamily of the treble clef fold. The name is derived from the conserved motif, AHH. It is found in bacterial polymorphic toxin systems [1] and functions as a toxin module. Like WHH and LHH, the AHH nuclease contains 4 conserved histidines of which, the first one is predicted to bind a metal-ion and the other three ones are involved in activation of a water molecule for hydrolysis. [1]. 21306995. 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. (from Pfam)
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