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NF-κB-dependent Luciferase Activation and Quantification of Gene Expression in Salmonella Infected Tissue Culture Cells
Published on: January 12, 2020
EHMT1 protein binds to nuclear factor-κB p50 and represses gene expression
Chee-Kwee Ea1, ShengLi Hao, Kok Siong Yeo
1Institute of Biological Sciences, Faculty of Science, University of Malaya, 50603 Kuala Lumpur, Malaysia.
The Journal of Biological Chemistry
|July 18, 2012
Summary
EHMT1, a histone methyltransferase, negatively regulates gene expression by methylating H3K9. Its role in suppressing NF-κB and interferon pathways enhances antiviral immunity when silenced.
Area of Science:
- Molecular Biology
- Epigenetics
- Immunology
Background:
- Transcriptional homeostasis requires a balance of gene activation and repression.
- Histone H3 lysine 9 (H3K9) methylation is typically associated with gene silencing.
- The role of euchromatic H3K9 methyltransferases in inflammatory and immune gene regulation is not fully understood.
Purpose of the Study:
- To investigate the function of EHMT1, a euchromatic H3K9 methyltransferase, in gene transcription regulation.
- To elucidate EHMT1's role in NF-κB and type I interferon signaling pathways.
- To determine the impact of EHMT1 on antiviral immunity.
Main Methods:
- Investigated EHMT1's catalytic activity on H3K9 methylation at target gene promoters.
- Examined protein-protein interactions between EHMT1 and p50.
- Utilized RNA interference (RNAi) to silence EHMT1 expression and assess gene expression changes, interferon production, and antiviral responses.
Main Results:
- EHMT1 catalyzes H3K9 methylation at promoters of NF-κB target genes, acting as a negative regulator.
- EHMT1 interacts with p50, which recruits EHMT1 to repress type I interferon-stimulated genes via H3K9 methylation.
- Silencing EHMT1 enhances NF-κB-regulated gene expression, boosts interferon production, and improves antiviral immunity.
Conclusions:
- EHMT1 functions as a critical negative regulator in both NF-κB and type I interferon-mediated gene induction.
- The p50-EHMT1 complex plays a key role in suppressing interferon-driven immune responses.
- Targeting EHMT1 can augment interferon production and enhance antiviral immunity, suggesting therapeutic potential.
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