The EIF2AK2 Knockout Jurkat Polyclonal Cells are a CRISPR/Cas9-edited polyclonal knockout population derived from the Jurkat human T-lymphocyte line. These cells harbor a diverse array of gene disruptions at the EIF2AK2 locus, collectively abolishing functional PKR (protein kinase R) expression. As a pooled polyclonal model, they avoid clonal selection bias while enabling robust loss-of-function analysis in innate immune and stress signaling studies.
The Jurkat host cell line originates from an acute T-cell leukemia patient and displays an immortalized T-cell phenotype expressing CD3, CD4, and IL-2 receptor. Extensively utilized to dissect TCR signaling, apoptosis, and HIV replication, Jurkat cells provide a physiologically relevant T-cell context for investigating PKR-dependent processes, particularly those linking antiviral responses to leukemic cell growth and survival.
EIF2AK2 encodes PKR, a serine/threonine kinase activated by double-stranded RNA (dsRNA) and the cellular activator PACT (PRKRA). Upon activation, PKR phosphorylates eIF2?? (EIF2S1), leading to global translational arrest and ATF4-mediated integrated stress response induction. PKR also phosphorylates I??B?? (NFKBIA) to activate NF-??B-driven pro-inflammatory transcription and engages MAPK cascades to modulate apoptosis. The kinase interacts with viral proteins such as HIV-1 Tat and influenza NS1, the RNA-editing enzyme ADAR1, and cellular partners including TRBP (TARBP2), and regulates downstream effectors like TP53 and STAT1, thereby integrating innate antiviral immunity with cell fate decisions.
Ablation of PKR in Jurkat cells offers a powerful system to study its role in T-cell antiviral defense, particularly during HIV-1 infection where PKR restricts viral replication and promotes apoptosis. Jurkat’s intact TCR and cytokine signaling pathways enable dissection of PKR-mediated NF-??B and MAPK activation in a leukemic background. This model is especially suited for examining crosstalk between dsRNA sensing, the integrated stress response, and immune mediator transcription.
Researchers can utilize these EIF2AK2 knockout cells for monitoring eIF2?? phosphorylation by Western blot, profiling interferon-stimulated genes via RT-qPCR, and assessing NF-??B activity with luciferase reporters. Co-immunoprecipitation experiments enable probing PKR interactions with PACT, TRBP, or viral proteins, while flow cytometry using Annexin V/PI quantifies apoptosis. The polyclonal population is also applicable for functional screens of PKR modulators and viral infection assays to dissect innate immune mechanisms. For further product details, please contact Ascent Research.
