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ER-Resident Transcription Factor Nrf1 Regulates Proteasome Expression and Beyond

Laboratory of Protein Metabolism, Graduate School of Pharmaceutical Sciences, the University of Tokyo, Tokyo 1130033, Japan
Author to whom correspondence should be addressed.
Int. J. Mol. Sci. 2020, 21(10), 3683;
Received: 4 May 2020 / Revised: 18 May 2020 / Accepted: 20 May 2020 / Published: 23 May 2020
(This article belongs to the Special Issue ERAD and Ubiquitination)
Protein folding is a substantively error prone process, especially when it occurs in the endoplasmic reticulum (ER). The highly exquisite machinery in the ER controls secretory protein folding, recognizes aberrant folding states, and retrotranslocates permanently misfolded proteins from the ER back to the cytosol; these misfolded proteins are then degraded by the ubiquitin–proteasome system termed as the ER-associated degradation (ERAD). The 26S proteasome is a multisubunit protease complex that recognizes and degrades ubiquitinated proteins in an ATP-dependent manner. The complex structure of the 26S proteasome requires exquisite regulation at the transcription, translation, and molecular assembly levels. Nuclear factor erythroid-derived 2-related factor 1 (Nrf1; NFE2L1), an ER-resident transcription factor, has recently been shown to be responsible for the coordinated expression of all the proteasome subunit genes upon proteasome impairment in mammalian cells. In this review, we summarize the current knowledge regarding the transcriptional regulation of the proteasome, as well as recent findings concerning the regulation of Nrf1 transcription activity in ER homeostasis and metabolic processes. View Full-Text
Keywords: proteasome; Nrf1; DDI2; bounce back; proteostasis proteasome; Nrf1; DDI2; bounce back; proteostasis
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Hamazaki, J.; Murata, S. ER-Resident Transcription Factor Nrf1 Regulates Proteasome Expression and Beyond. Int. J. Mol. Sci. 2020, 21, 3683.

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