Proteasome 26S subunit non-ATPase 6 (PSMD6) (PSMD6)

Proteasome 26S subunit non-ATPase 6 (PSMD6) is a non-catalytic component of the 19S regulatory particle of the 26S proteasome (UniProt P51665). It plays a critical role in the assembly, stability, and substrate recognition of the proteasome complex, which is responsible for the degradation of ubiquitinated proteins (NCBI Gene 5712). PSMD6 is frequently overexpressed in various malignancies, such as colorectal and breast cancers, where it promotes tumor cell survival and proliferation by facilitating the rapid turnover of regulatory proteins (PubMed PMID: 31428805, PMID: 28656234). High levels of PSMD6 mRNA are associated with poor clinical outcomes and resistance to standard therapies in cancer patients. Targeting PSMD6 mRNA using small interfering RNA (siRNA) or antisense oligonucleotides (ASOs) has been shown to disrupt proteasome assembly, leading to the accumulation of misfolded proteins and the induction of apoptosis (PubMed PMID: 31428805). While current FDA-approved proteasome inhibitors like bortezomib primarily target the 20S catalytic core, PSMD6 represents a promising alternative target within the regulatory particle to enhance therapeutic specificity and overcome resistance. Experimental studies demonstrate that silencing PSMD6 can effectively inhibit tumor growth in vivo, highlighting its potential as a therapeutic target. Monitoring PSMD6 expression levels may also serve as a valuable biomarker for patient stratification and monitoring treatment efficacy. This target is particularly relevant in the context of hematological malignancies and solid tumors that exhibit high proteasome dependency. Future development of PSMD6-specific inhibitors could provide a more targeted approach to cancer therapy with potentially fewer side effects than broad-spectrum inhibitors.

Other names

Rpn7p44S10S10P42AProteasome (prosome, macropain) 26S subunit, non-ATPase, 6

Inhibition of proteasome assembly and function through the degradation or silencing of the PSMD6 transcript, leading to proteotoxic stress and apoptosis (PubMed PMID: 31428805).