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Title: Salicylic acid-independent role of NPR1 is required for protection from proteotoxic stress in the plant endoplasmic reticulum

Journal Article · · Proceedings of the National Academy of Sciences of the United States of America
 [1];  [2];  [2]; ORCiD logo [2];  [3]; ORCiD logo [4]
  1. Michigan State University-US Department of Energy Plant Research Laboratory, Michigan State University, East Lansing, MI 48824,, Cell and Molecular Biology Program, Michigan State University, East Lansing, MI 48824,
  2. Michigan State University-US Department of Energy Plant Research Laboratory, Michigan State University, East Lansing, MI 48824,
  3. Michigan State University-US Department of Energy Plant Research Laboratory, Michigan State University, East Lansing, MI 48824,, Plant Biology Department, Michigan State University, East Lansing, MI 48824,, Howard Hughes Medical Institute, Michigan State University, East Lansing, MI 48824
  4. Michigan State University-US Department of Energy Plant Research Laboratory, Michigan State University, East Lansing, MI 48824,, Plant Biology Department, Michigan State University, East Lansing, MI 48824,

The unfolded protein response (UPR) is an ancient signaling pathway designed to protect cells from the accumulation of unfolded and misfolded proteins in the endoplasmic reticulum (ER). Because misregulation of the UPR is potentially lethal, a stringent surveillance signaling system must be in place to modulate the UPR. The vital signaling arms of the plant UPR have been discovered and rely on the transcriptional activity of the transcription factors bZIP60 and bZIP28 and on the kinase and ribonuclease activity of IRE1, which splices mRNA to activate bZIP60. Both bZIP28 and bZIP60 modulate UPR gene expression to overcome ER stress. In this study, we demonstrate at a genetic level that the transcriptional role of bZIP28 and bZIP60 in ER-stress responses is antagonized by nonexpressor of PR1 genes 1 (NPR1), a critical redox-regulated master regulator of salicylic acid (SA)-dependent responses to pathogens, independently of its role in SA defense. Moreover, we establish that the function of NPR1 in the UPR is concomitant with ER stress-induced reduction of the cytosol and translocation of NPR1 to the nucleus where it interacts with bZIP28 and bZIP60. Our findings indicate a cellular role for NPR1 as well as a model for plant UPR regulation whereby SA-independent ER stress-induced redox activation of NPR1 suppresses the transcriptional role of bZIP28 and bZIP60 in the UPR.

Research Organization:
Michigan State Univ., East Lansing, MI (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences, and Biosciences Division; National Institutes of Health (NIH)
Grant/Contract Number:
FG02-91ER20021
OSTI ID:
1437094
Alternate ID(s):
OSTI ID: 1540290
Journal Information:
Proceedings of the National Academy of Sciences of the United States of America, Journal Name: Proceedings of the National Academy of Sciences of the United States of America Vol. 115 Journal Issue: 22; ISSN 0027-8424
Publisher:
Proceedings of the National Academy of SciencesCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 46 works
Citation information provided by
Web of Science

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