A member of the ParB/sulfiredoxin superfamily of proteins found in polyvalent proteins prototyped by the version in the phage P1 ddRB protein. These proteins are predicted to function as nucleases [1].

1: Polyvalent Proteins, a Pervasive Theme in the Intergenomic Biological Conflicts of Bacteriophages and Conjugative Elements. Iyer LM, Burroughs AM, Anand S, de Souza RF, Aravind L; J Bacteriol. 2017; [Epub ahead of print] PMID:28559295