COMM domain-containing protein 1 (COMMD1) (COMMD1)

COMM domain-containing protein 1 (COMMD1) is a highly conserved scaffold protein and the founding member of the COMMD family [1, 6]. It plays a critical role in copper homeostasis by interacting with the copper transporters ATP7A and ATP7B to facilitate biliary copper excretion [7, 15]. Beyond copper metabolism, COMMD1 is a key regulator of the NF-kappaB and HIF-1 signaling pathways, typically acting to terminate their activity by promoting the ubiquitination and degradation of their subunits [1, 4, 13]. It is an integral component of the Commander complex, which mediates the endosomal recycling of various transmembrane proteins, including ion channels like ENaC and CFTR [7, 15]. Mutations in COMMD1 are the primary cause of hereditary copper toxicosis in Bedlington Terriers and act as a phenotypic modifier in human Wilson disease [15, 16]. In oncology, COMMD1 often functions as a tumor suppressor, and its downregulation is associated with poor prognosis in several cancers [1, 3]. Experimental therapeutics such as the peptide CIGB-552 target COMMD1 to induce NF-kappaB degradation, offering a novel strategy for treating inflammatory diseases and malignancies [1, 9]. Despite its therapeutic potential, the broad regulatory reach of COMMD1 across multiple essential pathways presents challenges for drug development, as complete loss of the protein is embryonically lethal in animal models [3, 14].

Other names

MURR1Copper metabolism MURR1 domain-containing protein 1Protein Murr1Copper metabolism gene MURR1

CIGB-552 is a synthetic peptide that interacts with COMMD1, increasing its levels and promoting the ubiquitination and proteasomal degradation of the NF-kappaB subunit RelA (p65), thereby inhibiting NF-kappaB-mediated pro-survival and pro-inflammatory signaling [1, 9].