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DCAF1 inhibits the NF-κB pathway by targeting p65
Fang Huang1, Weitong Yao2, Binlian Sun3
1Jiangxia Laboratory in Hubei, Wuhan 430000, China; Departments of Medicine, University of California, San Francisco, San Francisco, CA 94143, USA; Departments of Microbiology and Immunology, University of California, San Francisco, San Francisco, CA 94143, USA.
Immunology Letters
|September 2, 2022
Summary
DCAF1 regulates immune responses by controlling NF-κB activation. This protein inhibits p65 nuclear transport, impacting cellular immunity beyond its known roles with viral proteins.
Area of Science:
- Immunology
- Molecular Biology
- Virology
Background:
- DCAF1 is a substrate-recognizing subunit of E3 ligases involved in cellular processes.
- DCAF1 is a binding partner of HIV-1 viral protein R (Vpr), essential for Vpr functions.
Purpose of the Study:
- To investigate the role of DCAF1 in NF-κB pathway activation.
- To elucidate the mechanism by which DCAF1 regulates cellular immune responses.
Main Methods:
- Investigated NF-κB activation by Vpr proteins in the presence and absence of DCAF1.
- Analyzed the effect of DCAF1 depletion on NF-κB induction.
- Examined the interaction between DCAF1 and p65 to understand nuclear transport inhibition.
Main Results:
- DCAF1 is crucial for Vpr-mediated NF-κB activation.
- DCAF1 restrains NF-κB induction by external stimuli; its depletion enhances activation.
- DCAF1 inhibits p65 nuclear translocation through direct interaction, thereby suppressing the NF-κB pathway.
Conclusions:
- DCAF1 plays a novel role in regulating cellular immune responses.
- DCAF1 acts as an inhibitor of the NF-κB pathway, independent of its adaptor function for other proteins.
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