The GNB5 Knockout HEK293T Polyclonal Cells represent a CRISPR/Cas9-edited polyclonal knockout cell population designed for loss-of-function studies of the GNB5 gene in a human embryonic kidney background. This product consists of a heterogeneous pool of HEK293T cells carrying targeted gene disruption at the GNB5 locus, providing a robust model for investigating G protein-coupled receptor (GPCR) signaling networks without clonal selection. The polyclonal format mirrors natural genetic variation and is particularly suited for pooled functional screens, pathway analysis, and applications where population-wide knockout effects are assessed rather than single-cell-derived phenotypes.
The host cell line, HEK293T, is a widely utilized derivative of the HEK293 cell line that stably expresses the SV40 large T antigen, enabling episomal replication of plasmids containing the SV40 origin of replication. Originally derived from human embryonic kidney cells transformed with sheared adenovirus type 5 DNA, HEK293T cells are highly transfectable and support high-level recombinant protein expression, making them an industry standard for transient transfection, viral production, and biochemical assays. These features render HEK293T an ideal platform for dissecting GPCR signal transduction and for reconstituting signaling components in a tractable cellular environment.
GNB5 encodes the G protein subunit beta 5, a divergent member of the G?? family that forms obligate complexes with R7 family regulators of G protein signaling (RGS proteins) such as RGS7, RGS6, RGS9, and RGS11. Rather than pairing with G?? subunits, G??5 interacts with these RGS proteins and the membrane anchor R9AP to accelerate GTP hydrolysis on G?? subunits, thereby terminating GPCR signaling. The GNB5?CRGS complex acts downstream of various GPCRs, including dopamine and adrenergic receptors, and modulates key effectors such as adenylyl cyclase, phospholipase C beta, and voltage-gated calcium channels. Mechanistically, GNB5/RGS7 complexes enhance the GTPase activity of G??i/o, leading to reduced cAMP production and altered PKA-CREB transcriptional output, while also influencing MAPK/ERK and PI3K-Akt cascades.
In the HEK293T background, disruption of GNB5 is expected to impair RGS-mediated signal termination, resulting in sustained GPCR responses and potential dysregulation of downstream pathways. Given the expression of endogenous GPCRs and signal transducers in HEK293T cells, this knockout model permits the deconvolution of G??5-dependent signaling events from other G protein subunits. The loss of GNB5 function is particularly relevant for studying cardiac electrophysiology, as mutations in GNB5 are associated with cardiac arrhythmias, and for modeling neurological disorders linked to G protein signaling imbalances. Furthermore, the high transfectability of HEK293T cells allows for complementation experiments with wild-type or mutant GNB5 constructs to probe structure-function relationships.
This knockout cell pool is suitable for a broad range of experimental workflows. Typical applications include cAMP accumulation assays and calcium flux measurements to quantify GPCR signaling dynamics, co-immunoprecipitation studies to assess GNB5?CRGS complex formation, and patch-clamp electrophysiology to examine ion channel modulation. The cells can be employed in reporter gene assays for transcription factors like CREB and NFAT, as well as in high-throughput drug screening campaigns targeting GPCR pathways. Researchers may also use them for western blotting and RT-qPCR to validate knockout efficiency and for cell proliferation studies in the context of cancer and metabolic syndrome. For additional details or technical support, please contact Ascent Research.
