This domain is found at the N-terminal of a group of bacterial phosphatases and arsenate reductases, including Protein-tyrosine- phosphatase from Corynebacterium glutamicum. This domain, often found associated to Pfam:PF01451, forms a three-helical bundle that interacts with the active site of the other chain in the dimeric interface [1].

1: Corynebacterium glutamicum survives arsenic stress with arsenate reductases coupled to two distinct redox mechanisms. Villadangos AF, Van Belle K, Wahni K, Dufe VT, Freitas S, Nur H, De Galan S, Gil JA, Collet JF, Mateos LM, Messens J; Mol Microbiol. 2011;82:998-1014. PMID:22032722