COP9 signalosome complex subunit 6

COPS6 (COP9 signalosome complex subunit 6) is a component of the COP9 signalosome, a multi-subunit complex that regulates ubiquitin-dependent protein degradation and cellular signaling. The complex mediates deneddylation of cullin subunits in SCF-type E3 ligase complexes, thereby modulating ubiquitin ligase activity. COPS6 also stabilizes the COP1 protein and participates in phosphorylation of key transcription factors including p53 and c-jun (UniProt: Q7L5N1).

The COP9 signalosome is broadly involved in cellular and developmental processes across tissues. No UniProt-documented disease associations are currently curated for COPS6 itself, though the complex's role in protein quality control suggests potential relevance to neurodegenerative pathways.

COPS6 is associated with Alzheimer's disease in this dataset. Proteomic analysis of post-mortem AD brain tissue versus age-matched controls identified COPS6 as upregulated, with a mean log2 fold-change of 0.72 (Chaparral AD proteomics). This elevation may reflect altered ubiquitin-proteasome system activity or compensatory responses to proteostatic stress characteristic of AD pathology.