The AP3B2 Knockout HEK293T Polyclonal Cells are a CRISPR/Cas9-edited polyclonal knockout population derived from the HEK293T human embryonic kidney cell line, engineered to disrupt the AP3B2 gene and eliminate expression of the neuron-specific beta2 adaptin subunit of the AP-3 adaptor complex. This polyclonal format preserves the intrinsic genetic heterogeneity of a pooled knockout population, enabling robust, population-level studies of AP-3-dependent membrane trafficking while avoiding clonal selection biases. The cells are supplied as a ready-to-use, stable knockout model suitable for downstream molecular, biochemical, and pharmacological analyses.
The parental HEK293T cell line is an adherent epithelial line originally derived from human embryonic kidney cells transformed with sheared adenovirus type 5 DNA and stably expressing the SV40 large T antigen. This genetic background enables high-level amplification of plasmids bearing the SV40 origin of replication and facilitates transient protein expression and lentiviral or retroviral packaging. HEK293T cells are widely employed in biomedical research for signal transduction studies, functional genomics, and drug discovery due to their ease of culture, transfectability, and extensive molecular characterization.
AP3B2 encodes the ??2 subunit of the heterotetrameric AP-3 adaptor complex, which also includes ?? (AP3D1), ??3 (AP3M1), and ??3 (AP3S1) subunits. This complex is recruited to early endosomal membranes by the GTP-bound form of ARF1 and recognizes dileucine- and tyrosine-based sorting signals on transmembrane cargo proteins such as LAMP1, synaptophysin, VGLUT1, and ZnT3. The AP-3 complex subsequently directs these cargoes into transport vesicles destined for lysosomes, lysosome-related organelles, and synaptic vesicles. Upstream, AP-3 function is modulated by PI3K and mTORC1 signaling pathways and can be transcriptionally regulated by neurogenic factors such as NEUROD1. The ??2 subunit serves as a critical scaffold for stabilizing the complex and interacting with clathrin and accessory factors, including BLOC-1 and VAMP7, to ensure proper vesicle formation and cargo selection.
Although AP3B2 is predominantly associated with neuronal tissues, its knockout in HEK293T cells provides a unique and simplified epithelial model for dissecting conserved AP-3?Cmediated trafficking mechanisms. Disruption of AP3B2 expression abolishes functional AP-3 complexes containing the ??2 isoform, leading to predictable defects in the sorting of lysosomal membrane proteins and a redistribution of cargo markers to early endosomal compartments. This model allows researchers to study the intracellular itinerary of AP-3 clients in a cell system that lacks the complexity of polarized neurons, making it ideal for reconstitution experiments with wild-type or disease-associated AP3B2 variants and for high-throughput chemical genomics screens.
Researchers can employ this knockout model in a variety of experimental settings, including Western blotting and RT-qPCR to confirm loss of target gene expression, immunofluorescence colocalization assays to track LAMP1 and early endosome markers, ATP-based viability assays for drug sensitivity profiling with lysosomal modulators, and co-immunoprecipitation to probe AP-3 complex assembly. This product is particularly valuable for modeling AP-3 complex deficiency disorders, such as early-onset epileptic encephalopathy linked to AP3B2 mutations and Hermansky-Pudlak syndrome?Clike phenotypes, and for screening small molecules aimed at restoring lysosomal protein sorting. For technical inquiries or to place an order, please contact Ascent Research.
