COMM domain-containing protein 7

COMMD7 (COMM domain-containing protein 7) is a 200-amino-acid scaffold protein that functions as a core component of the commander complex, which mediates endosomal recycling of transmembrane cargo proteins (UniProt: Q86VX2). The protein also associates with the NF-κB signaling complex where it acts as a transcriptional suppressor, and may modulate activity of cullin-RING E3 ubiquitin ligase complexes.

The commander complex integrates the CCC and retriever subcomplexes to regulate intracellular trafficking and cargo sorting (UniProt: Q86VX2). COMMD7's role in endosomal recycling positions it at a key nexus of cellular homeostasis and signal transduction pathways relevant to neuronal function and protein handling.

In Alzheimer's Disease, COMMD7 is significantly upregulated in post-mortem AD brain tissue compared to age-matched controls (Chaparral AD proteomics). The protein shows a mean log2 fold-change of +0.31 across analyzed subcellular fractions from TMT-labeled proteomics of four compartments (P2, P3, S2, S3) in a data-dependent acquisition experiment. This upregulation may reflect altered endosomal-recycling dynamics or compensatory responses to proteostatic stress in AD pathology.