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Published on: March 14, 2019
NFE2L1/Nrf1 forms a coactivator complex post-peptide:N-glycanase-mediated sequence editing and mitigates proteasome
Yukiko Yoshida1, Meari Okada1, Naoko Arai1
1Laboratory of Protein Metabolism, Tokyo Metropolitan Institute of Medical Science, Tokyo 156-8506, Japan.
Nuclear factor erythroid 2-like 1 (Nrf1) is activated by sequence editing, a unique process for transcription factors. This editing is crucial for proteasome gene expression and cell survival, but its constitutive activation can be toxic.
Area of Science:
- Molecular Biology
- Cellular Biology
- Biochemistry
Background:
- Nuclear factor erythroid 2-like 1 (NFE2L1/Nrf1) is an ER-associated transcription factor regulating proteasome genes.
- Nrf1 is unique as it undergoes sequence editing for transcriptional activation, a process involving peptide:N-glycanase (NGLY1).
Purpose of the Study:
- To elucidate the mechanism by which sequence editing regulates Nrf1's transcriptional activity.
- To investigate the role of N-glycosylation site editing in Nrf1's function and cellular response.
Main Methods:
- Studied sequence editing of N-glycosylation sites in human Nrf1 in HeLa cells.
- Investigated protein interactions and chromatin binding of Nrf1.
- Analyzed the impact of Nrf1 mutants on cell growth.
Main Results:
- Sequence editing of Nrf1's Asn574 site is essential for proteasome gene expression and interaction with host cell factor C1 and O-GlcNAc transferase.
- Editing of other N-glycosylation sites facilitates coactivator CREBBP/EP300 interaction, enhancing transcriptional activity.
- Constitutive activation of Nrf1 via mimicking proteolytic processing or NGLY1 editing reduced cell growth, indicating cytotoxicity.
Conclusions:
- Nrf1 activation is a regulated, on-demand process crucial for cellular survival during proteasomal stress.
- Sequence editing of Nrf1 is a key regulatory mechanism controlling its transcriptional activity and interaction with coactivator complexes.
- Uncontrolled Nrf1 activation can lead to cytotoxicity, highlighting the importance of its regulated expression.
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