The AP3B2 Knockout HeLa Polyclonal Cells are a CRISPR/Cas9-edited polyclonal knockout population targeting the AP3B2 gene. AP3B2 encodes the beta-2 subunit of the adaptor protein 3 complex, essential for vesicular trafficking. This product consists of a heterogeneous pool of HeLa cells harboring gene disruptions introduced by non-homologous end joining following Cas9-mediated double-strand breaks. The polyclonal format provides a robust loss-of-function model without clonal selection, enabling assessment of AP3B2 function across a diverse genetic background.
HeLa cells, the parental line, are a human cervical epithelial adenocarcinoma line immortalized by integrated human papillomavirus 18 (HPV-18) DNA. Constitutive expression of HPV E6 and E7 oncoproteins inactivates p53 and Rb, conferring a tumorigenic, aneuploid phenotype. HeLa cells are widely employed for studies of cell cycle, apoptosis, and as a transfection-competent host. Their extensive characterization and ease of genetic manipulation make them an ideal platform for generating knockout models to dissect gene function in a cancer-relevant context.
AP3B2 functions within the heterotetrameric AP-3 complex, together with AP3D1, AP3M1, and AP3S1 subunits. Recruited to the trans-Golgi network by ARF1, the complex interacts with clathrin and recognizes tyrosine-based sorting signals (YXX??) on cargo proteins such as LAMP1, CD63, and tyrosinase. Transcriptional regulation is mediated by TFEB and MITF, downstream of mTORC1 signaling. Knockout of AP3B2 dismantles AP-3 complex formation, leading to missorting of lysosomal membrane proteins and defective biogenesis of lysosomes and lysosome-related organelles. Additional pathways affected include melanogenesis and synaptic vesicle recycling.
In HeLa cells, AP3B2 knockout disrupts lysosomal and endosomal protein trafficking, manifesting as altered localization of LAMP1 and CD63. This perturbation is relevant to modeling Hermansky-Pudlak syndrome type 2 and the neurodevelopmental disorder NEDESBA, both linked to AP3B2 mutations. Moreover, because lysosomes are critical for nutrient sensing and autophagy in rapidly dividing cancer cells, this cell model offers unique opportunities to study the intersection of lysosomal biology with tumor metabolism. The HeLa background ensures reproducibility and compatibility with standard cell biology techniques.
Typical applications include Western blotting for AP3B2 and LAMP1, immunofluorescence microscopy to track CD63 and LAMP1 distribution, and LysoTracker staining for lysosomal pH assessment. Co-immunoprecipitation with AP-3 subunits or clathrin probes complex integrity, and cargo sorting assays using CD63-GFP quantify trafficking efficiency. Electron microscopy can visualize lysosomal ultrastructural changes. These tools enable screening for AP-3 function modulators and mechanistic studies of lysosomal biogenesis. For further information or ordering, please contact Ascent Research.
