EEF1AKMT3 Knockout THP-1 Cell Line

The EEF1AKMT3 Knockout THP-1 Cell Line is a CRISPR/Cas9-edited knockout cell line derived from the THP-1 human monocytic leukemia line. It features targeted disruption of EEF1AKMT3, which encodes a methyltransferase specific for eukaryotic translation elongation factor 1A (eEF1A). This loss-of-function model enables dissection of eEF1A Lys-318 trimethylation in translation control, providing a stable system to study methylation-dependent regulation of protein synthesis.

The THP-1 host cell line is a widely used human monocytic leukemia model originally isolated from an acute monocytic leukemia patient. These suspension cells can be differentiated into macrophage-like cells upon phorbol ester treatment, offering a versatile platform for studies of monocyte/macrophage biology, inflammatory signaling, and leukemogenesis. Their use in translation research is especially relevant given the integration of metabolic and stress cues in immune cell function.

EEF1AKMT3 (also known as METTL21B) catalyzes trimethylation of eEF1A at Lys-318, a modification critical for translation elongation fidelity and efficiency. Its activity is regulated by upstream signals including mTOR kinase, amino acid availability, and cellular stress, positioning it as a node linking nutrient sensing to protein synthesis. Downstream effectors of mTOR such as S6K and 4E-BP modulate EEF1AKMT3 function. The methyltransferase interacts directly with its substrate eEF1A, the methyl donor S-adenosylmethionine, and elongation factors eEF1B and eEF1G. Methylation status of eEF1A influences translation elongation rate, ribosome processivity, and protein fidelity; dysregulated methylation can lead to ribosome stalling and activate stress response pathways.

In the THP-1 leukemia background, EEF1AKMT3 knockout allows dissection of how methylation-driven translation control impacts monocytic malignancy and macrophage differentiation. Since dysregulated protein synthesis is a hallmark of cancer, this model facilitates investigation of eEF1A methylation effects on leukemic cell proliferation and survival. Moreover, the ability to induce macrophage-like differentiation enables studies of proteomic reprogramming during immune cell maturation. This cell line also provides a system to explore connections between translation defects and neurodevelopmental disorders linked to altered eEF1A function.

Key applications include western blotting and RT-qPCR for gene expression analysis, SUnSET-based puromycin incorporation assays to measure global translation, and eEF1A methylation assessment using methyl-specific antibodies or mass spectrometry. The line is compatible with macrophage differentiation assays, cell proliferation studies, and genome-wide transcriptomic profiling via RNA-seq. These tools allow detailed dissection of the mTOR?CEEF1AKMT3?CeEF1A signaling axis, stress response mechanisms, and the role of protein methylation in leukemogenesis. For further information or to inquire about this model, please contact Ascent Research.