This domain is a copper-binding domain found in single or multiple copies at the N-terminus of a wide variety of copper or other heavy metal binding transporters and other proteins.

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2: Crystal structure of the CusBA heavy-metal efflux complex of Escherichia coli. Su CC, Long F, Zimmermann MT, Rajashankar KR, Jernigan RL, Yu EW; Nature. 2011;470:558-562. PMID:21350490

3: Crystal structure of a copper-transporting PIB-type ATPase. Gourdon P, Liu XY, Skjorringe T, Morth JP, Moller LB, Pedersen BP, Nissen P; Nature. 2011;475:59-64. PMID:21716286

4: Copper-transporting P-type ATPases use a unique ion-release pathway. Andersson M, Mattle D, Sitsel O, Klymchuk T, Nielsen AM, Moller LB, White SH, Nissen P, Gourdon P; Nat Struct Mol Biol. 2014;21:43-48. PMID:24317491