The DNAJB4 Knockout HeLa Polyclonal Cells constitute a CRISPR/Cas9-edited polyclonal knockout cell population designed for loss-of-function analysis of the DNAJB4 gene. This product provides a targeted gene disruption model in HeLa cells, enabling detailed investigation of DNAJB4-dependent cellular processes. The polyclonal knockout format ensures a heterogeneous population carrying diverse CRISPR/Cas9-mediated disruptions, reflecting a broad range of editing events without selection for single-cell clonal expansion. Researchers can employ this model to dissect the specific contributions of DNAJB4 to protein homeostasis and stress-responsive pathways in a well-characterized human epithelial cell background.
HeLa cells serve as the host line, an immortalized epithelial line derived from a cervical adenocarcinoma. These cells are robust and easy to manipulate, making them a mainstay in biomedical research, particularly for studies of cancer biology, signal transduction, and stress responses. Their rapid proliferation and well-documented molecular landscape facilitate reproducible experimental setups. The epithelial origin is especially relevant for investigations of protein quality control mechanisms that are frequently dysregulated in carcinomas, and the endogenous expression of heat shock pathway components in HeLa cells provides a relevant context for probing DNAJB4 function.
DNAJB4 functions as a co-chaperone that stimulates the ATPase activity of Hsp70 family members, including HSPA1A (Hsp70) and HSPA8 (Hsc70), thereby accelerating the cycle of substrate binding and release. This activity is essential for the folding, trafficking, and degradation of misfolded and aggregation-prone client proteins. The protein is integrated into the heat shock response and the unfolded protein response, with expression regulated by the transcription factor HSF1 upon exposure to stressors such as heat shock and oxidative stress. At the molecular level, DNAJB4 interacts with BAG family co-chaperones and the E3 ubiquitin ligase STUB1, forming complexes that channel irreparable substrates toward proteasomal clearance. Representative components of this signaling network include HSF1, HSPA1A, STUB1, and HSP90, which collectively govern proteostasis.
In the HeLa cellular environment, disruption of DNAJB4 creates a platform to interrogate the consequences of impaired Hsp70-mediated protein quality control. Without functional DNAJB4, the cell??s ability to manage misfolded protein loads under basal and stress conditions is compromised, potentially leading to increased protein aggregation and altered cell survival pathways. This model is therefore instrumental in linking chaperone dysfunction to pathological states such as cancer and neurodegeneration, where proteostatic collapse is a common feature. Researchers can monitor how loss of DNAJB4 affects the handling of endogenous aggregation-prone substrates or influences the cellular response to chemotherapeutic agents that induce proteotoxic stress.
The DNAJB4 Knockout HeLa Polyclonal Cells are suited for a wide range of experimental applications, including proteostasis studies, chaperone function assays, and protein aggregation research. Typical techniques employed include western blotting to assess changes in chaperone and client protein levels, co-immunoprecipitation to examine altered protein?Cprotein interactions within the Hsp70 machinery, and ATPase activity assays to quantify co-chaperone function directly. Protein aggregation assays and HSF1 activity reporter assays further enable modeling of stress response dynamics, while immunofluorescence can visualize localization changes of key effectors. For additional details, please contact Ascent Research.
