COPS7B Knockout Raji Polyclonal Cells provide a heterogeneous population of Raji B lymphocytes with CRISPR/Cas9-mediated disruption of the COPS7B gene, encoding a key subunit of the COP9 signalosome (CSN). Unlike clonal knockout lines, this polyclonal pool preserves the inherent biological variability of the editing process, enabling robust functional studies without clonal selection artifacts. The product is a ready-to-use model for investigating CSN-mediated deneddylation in a lymphoma-relevant context and can be employed for loss-of-function analyses, drug screening, and signaling pathway dissection.
The host Raji cell line originates from an EBV-positive human Burkitt’s lymphoma and displays a highly proliferative B-lymphocyte phenotype. These cells are widely recognized for their utility in B-cell receptor (BCR) signaling studies, apoptosis research, and viral oncogenesis due to their well-characterized transcriptional and post-translational regulatory networks. The EBV-driven background also provides a relevant milieu for examining the interplay between oncogenic viruses and the ubiquitin-proteasome system.
COPS7B is an integral component of the CSN, which catalyzes the removal of NEDD8 from cullin-RING E3 ubiquitin ligases (CRLs), thereby dynamically controlling CRL activity. In the Raji context, the knockout of COPS7B disrupts CSN assembly and function, leading to hyperneddylation of cullins such as CUL1 and consequent constitutive activation of CRL complexes. This deregulates ubiquitination and turnover of substrates including p27 (CDKN1B), I??B??, and HIF1??, with downstream effects on pathways governed by NF-??B, Wnt/??-catenin, and cyclin-dependent kinases. The COPS7B-deficient state also perturbs interactions with other CSN subunits (COPS1?CCOPS8), cullin family members, and regulatory proteins like RBX1, altering the balance of protein degradation and signaling fidelity.
In B-cell lymphoma, CSN-mediated deneddylation is increasingly recognized as a vulnerability that can be exploited therapeutically. COPS7B knockout in Raji cells sensitizes these lymphoma cells to proteotoxic stress and exposes reliance on CRL-dependent pathways for survival and proliferation. This model is particularly informative for understanding how aberrant neddylation contributes to oncogenesis, given the central role of CRLs in degrading tumor suppressors and cell cycle regulators. The polyclonal population also mimics the genetic heterogeneity of tumors more closely than monoclonal derivatives, enhancing the translational relevance of mechanistic and pharmacological studies.
Researchers can utilize COPS7B Knockout Raji Polyclonal Cells in a variety of experimental workflows. Key applications include Western blot analysis of cullin neddylation status using anti-NEDD8 antibodies, ubiquitination assays to assess substrate turnover, co-immunoprecipitation to probe CSN complex integrity, flow cytometry for cell cycle and apoptosis profiling, and RT-qPCR to measure transcriptional changes in downstream targets like cyclin E and c-MYC. Additionally, these cells are suitable for drug sensitivity testing with neddylation inhibitors such as MLN4924 or proteasome inhibitors like bortezomib, enabling validation of therapeutic targets within the ubiquitin-proteasome system. For further technical assistance, please contact Ascent Research.
