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EMBO Rep. 2020 Jan 9:e48902. doi: 10.15252/embr.201948902. [Epub ahead of print]

NBR1-mediated p62-liquid droplets enhance the Keap1-Nrf2 system.

Author information

1
Department of Physiology, Juntendo University Graduate School of Medicine, Bunkyo-ku, Japan.
2
Department of Cell Biology and Neuroscience, Juntendo University Graduate School of Medicine, Bunkyo-ku, Japan.
3
Department of Anatomy and Histology, Fukushima Medical University School of Medicine, Fukushima, Japan.

Abstract

p62/SQSTM1 is a multivalent protein that has the ability to cause liquid-liquid phase separation and serves as a receptor protein that participates in cargo isolation during selective autophagy. This protein is also involved in the non-canonical activation of the Keap1-Nrf2 system, a major oxidative stress response pathway. Here, we show a role of neighbor of BRCA1 gene 1 (NBR1), an autophagy receptor structurally similar to p62/SQSTM1, in p62-liquid droplet formation and Keap1-Nrf2 pathway activation. Overexpression of NBR1 blocks selective degradation of p62/SQSTM1 through autophagy and promotes the accumulation and phosphorylation of p62/SQSTM1 in liquid-like bodies, which is required for the activation of Nrf2. NBR1 is induced in response to oxidative stress, which triggers p62-mediated Nrf2 activation. Conversely, loss of Nbr1 suppresses not only the formation of p62/SQSTM1-liquid droplets, but also of p62-dependent Nrf2 activation during oxidative stress. Taken together, our results show that NBR1 mediates p62/SQSTM1-liquid droplet formation to activate the Keap1-Nrf2 pathway.

KEYWORDS:

NBR1; Nrf2; autophagy; liquid droplet; p62/SQSTM1

PMID:
31916398
DOI:
10.15252/embr.201948902

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