TY - JOUR
T1 - Arabidopsis translation initiation factor binding protein CBE1 negatively regulates accumulation of the NADPH oxidase respiratory burst oxidase homolog D
AU - George, Jeoffrey
AU - Stegmann, Martin
AU - Monaghan, Jacqueline
AU - Bailey-Serres, Julia
AU - Zipfel, Cyril
N1 - Data availability statement: All data are contained within the manuscript.
Funding Information: This work was funded by The Gatsby Charitable Foundation (to C. Z.), The Biotechnology and Biological Research Council (BB/P012574/1), the University of Zürich (to C. Z.), and the Swiss National Science Foundation grant no. 31003A_182625 (to C. Z.). M. S. was supported by the Deutsche Forschungsgemeinschaft (Fellowship STE 2448/1) and J. M. by the European Molecular Biology Organization (Fellowships ALTF 459-2011).
PY - 2023/8
Y1 - 2023/8
N2 - Cell surface pattern recognition receptors sense invading pathogens by binding microbial or endogenous elicitors to activate plant immunity. These responses are under tight control to avoid excessive or untimely activation of cellular responses, which may otherwise be detrimental to host cells. How this fine-tuning is accomplished is an area of active study. We previously described a suppressor screen that identified Arabidopsis thaliana mutants with regained immune signaling in the immunodeficient genetic background bak1-5, which we named modifier of bak1-5 (mob) mutants. Here, we report that bak1-5 mob7 mutant restores elicitor-induced signaling. Using a combination of map-based cloning and whole-genome resequencing, we identified MOB7 as conserved binding of eIF4E1 (CBE1), a plant-specific protein that interacts with the highly conserved eukaryotic translation initiation factor eIF4E1. Our data demonstrate that CBE1 regulates the accumulation of respiratory burst oxidase homolog D, the NADPH oxidase responsible for elicitor-induced apoplastic reactive oxygen species production. Furthermore, several mRNA decapping and translation initiation factors colocalize with CBE1 and similarly regulate immune signaling. This study thus identifies a novel regulator of immune signaling and provides new insights into reactive oxygen species regulation, potentially through translational control, during plant stress responses.
AB - Cell surface pattern recognition receptors sense invading pathogens by binding microbial or endogenous elicitors to activate plant immunity. These responses are under tight control to avoid excessive or untimely activation of cellular responses, which may otherwise be detrimental to host cells. How this fine-tuning is accomplished is an area of active study. We previously described a suppressor screen that identified Arabidopsis thaliana mutants with regained immune signaling in the immunodeficient genetic background bak1-5, which we named modifier of bak1-5 (mob) mutants. Here, we report that bak1-5 mob7 mutant restores elicitor-induced signaling. Using a combination of map-based cloning and whole-genome resequencing, we identified MOB7 as conserved binding of eIF4E1 (CBE1), a plant-specific protein that interacts with the highly conserved eukaryotic translation initiation factor eIF4E1. Our data demonstrate that CBE1 regulates the accumulation of respiratory burst oxidase homolog D, the NADPH oxidase responsible for elicitor-induced apoplastic reactive oxygen species production. Furthermore, several mRNA decapping and translation initiation factors colocalize with CBE1 and similarly regulate immune signaling. This study thus identifies a novel regulator of immune signaling and provides new insights into reactive oxygen species regulation, potentially through translational control, during plant stress responses.
KW - innate immunity
KW - NADPH oxidase
KW - ROS
KW - signaling
KW - translation
UR - http://www.scopus.com/inward/record.url?scp=85166905187&partnerID=8YFLogxK
U2 - 10.1016/j.jbc.2023.105018
DO - 10.1016/j.jbc.2023.105018
M3 - Article
C2 - 37423301
AN - SCOPUS:85166905187
SN - 0021-9258
VL - 299
JO - Journal of Biological Chemistry
JF - Journal of Biological Chemistry
IS - 8
M1 - 105018
ER -