The COMMD (Copper Metabolism Murr1 (Mouse U2af1-rs1 region 1) Domain) proteins are highly conserved in metazoans and unicellular protozoa. There are ten family members that play key roles in intracellular trafficking and in the regulation of transcription. A hallmark of the COMMD family members is a highly conserved C-terminal sequence of 70-80 amino acids called the COMM domain, which has no known structure. This entry represents the N-terminal domain of these proteins, which is referred to as the HN (helical N-terminal) domain, is more variable in sequence across the ten proteins [1]. This helical N-terminal domain has a globular architecture and is composed of a six-helix bundle with a meander topology [1].

1: Structural insights into the architecture and membrane interactions of the conserved COMMD proteins. Healy MD, Hospenthal MK, Hall RJ, Chandra M, Chilton M, Tillu V, Chen KE, Celligoi DJ, McDonald FJ, Cullen PJ, Lott JS, Collins BM, Ghai R; Elife. 2018; [Epub ahead of print] PMID:30067224