SGK3 Knockout HAP1 Cell Line

The choice depends on whether you are studying SGK3 (serum and glucocorticoid-regulated kinase 3)'s role as a PI3K-dependent kinase activated by endosomal PI(3)P or its emerging functions as a compensatory pathway for AKT-targeted cancer therapy. The Knockout line is the standard tool for asking whether SGK3 is required for these activities — SGK3 is uniquely activated by PI(3)P (via its PX domain) and PDK1 phosphorylation, distinguishing it from AKT and other SGK family members. Overexpression is useful for studying SGK3 in cancer contexts where it provides PI3K signaling redundancy. For PI3K-AKT pathway research, the EDITGENE SGK3 Knockout in HAP1 is highly informative — SGK3 has emerged as a critical bypass pathway for AKT inhibitor resistance in cancer, particularly in PIK3CA-mutant tumors. Rescue with wild-type, kinase-dead (K191A), or PX-domain-mutant (PI(3)P-binding-deficient) SGK3 enables comprehensive structure-function studies. The knockout serves as a critical specificity control for SGK3 inhibitors (14h, others) in cancer drug development.

Primary applications: • Substrate phosphorylation: phospho-NDRG1 and other AKT/SGK family substrates Western blot to assess SGK3-dependent phosphorylation. • PI3K bypass studies: cellular response to AKT inhibitors (MK-2206, ipatasertib) in SGK3-null cells — SGK3 mediates AKT-independent PI3K signaling. • Endosomal PI(3)P regulation: SGK3 localization analysis using PX domain-tagged constructs to characterize PI(3)P-dependent activation. • Cancer phenotype assays: proliferation in PI3K pathway-active cancer cells under various inhibitor combinations. EDITGENE recommends this model for researchers investigating SGK3 kinase biology, PI3K pathway redundancy, and AKT inhibitor resistance mechanisms.

Yes. SGK3 rescue experiments require attention to PI(3)P-dependent activation: • Construct design: use a codon-modified SGK3 sequence with a small C-terminal tag (FLAG, HA). SGK3 contains an N-terminal PX domain (PI(3)P-binding) and kinase domain — preserve both. • Kinase-dead rescue: the K191A mutation in the ATP-binding lysine abolishes catalytic activity and is the standard specificity control. • PX-domain-mutant rescue: PI(3)P-binding-deficient mutations (e.g., R90A) disrupt endosomal targeting without affecting kinase activity, enabling activation mechanism studies. • Functional readout: rescue should restore SGK3 substrate phosphorylation (NDRG1) and PI3K pathway redundancy under AKT inhibition. HAP1-specific considerations: • Diploidization: HAP1 cells gradually diploidize during extended culture — confirm ploidy by flow cytometry at the time of phenotypic assay. • Integration site sensitivity: position effects on transgene expression are more pronounced in near-haploid backgrounds; generating multiple independent rescue clones is strongly recommended. • Transduction efficiency: HAP1 transduces with lentivirus at moderate efficiency — increase MOI compared to standard immortalized lines.