This domain is found at the C-terminal end of Protein ChrB from the Proteobacteria Cupriavidus metallidurans, a protein involved in the reduction of chromate accumulation that is essential for chromate resistance [1,2]. This domain may carry the metal detection motives that are important for its function [3].

1: New genes involved in chromate resistance in Ralstonia metallidurans strain CH34. Juhnke S, Peitzsch N, Hubener N, Grosse C, Nies DH; Arch Microbiol. 2002;179:15-25. PMID:12471500

2: Nucleotide sequence and expression of a plasmid-encoded chromate resistance determinant from Alcaligenes eutrophus. Nies A, Nies DH, Silver S; J Biol Chem. 1990;265:5648-5653. PMID:2180932

3: Identification and characterization of the transcriptional regulator ChrB in the chromate resistance determinant of Ochrobactrum tritici 5bvl1. Branco R, Morais PV; PLoS One. 2013;8:e77987. PMID:24223748