The ABTB1 Knockout HEK293T Polyclonal Cells are a CRISPR/Cas9-edited human cell population generated from HEK293T embryonic kidney epithelial cells, engineered to disrupt the ABTB1 gene. This polyclonal knockout pool contains a diverse array of edited alleles, offering a robust loss-of-function model that avoids the biases of single-cell clones. The product is provided as live cells and is intended for advanced research into ubiquitin-proteasome system dynamics and CUL3-RING E3 ligase function.
HEK293T cells are a human embryonic kidney epithelial derivative that stably expresses the SV40 large T antigen, conferring exceptional transfectability and the capacity for high-level transient protein expression and viral production. This host is a cornerstone for biochemical, pharmacological, and genomic studies, enabling efficient delivery of nucleic acids and rapid evaluation of protein function. Its well-characterized background makes it particularly suitable for dissecting pathways such as ubiquitin-mediated degradation.
The ABTB1 protein contains an N-terminal BTB domain that mediates assembly into CUL3-RING E3 ubiquitin ligase complexes, where it acts as a substrate-specific adaptor. In this role, ABTB1 interacts with the scaffold protein CUL3 and the RING protein RBX1 to facilitate ubiquitin conjugation to target substrates, directing them to the proteasome for degradation. This adaptor function is essential for protein quality control and the selective turnover of cellular proteins, although its specific substrates remain to be identified. ABTB1??s activity may be modulated by stress signals, and its knockout is anticipated to stabilize client proteins, thereby perturbing homeostasis. The pathway includes core components such as CUL3, RBX1, ubiquitin, and the 26S proteasome.
In the HEK293T background, ABTB1 knockout provides a powerful tool for investigating how loss of a single adaptor alters ubiquitin-proteasome network activity. The polyclonal cell population reduces confounding effects from clonal variation, enhancing reproducibility in functional studies. The host??s high transfectability allows for complementation with ABTB1 variants and ectopic expression of putative substrates, facilitating pulse-chase or cycloheximide chase assays to measure protein half-life. Additionally, the presence of SV40 large T antigen may reveal synergies or dependencies in stress-response pathways, expanding the model??s utility in cancer and neurodegeneration research.
This knockout model supports diverse experimental workflows, including western blotting to detect changes in substrate abundance, co-immunoprecipitation to isolate ABTB1 complexes, and in vitro ubiquitination assays to assess E3 ligase activity. Proteasome inhibition assays can differentiate between degradation routes, while quantitative mass spectrometry enables global interactome and ubiquitinome profiling. Typical research applications encompass the identification of ABTB1 substrates, elucidation of CUL3-based E3 ligase regulatory mechanisms, and functional analysis of protein quality control pathways. For additional technical information or customization requests, please contact Ascent Research.
