Differential ubiquitin modifications of ESCRT‐I subunits VPS37‐1 and VPS28‐2 positively regulate plant immunity
- 1Department of Plant Pathology, Center for Plant Science Innovation University of Nebraska Lincoln NE 68588 USA
Abstract
Sensing of pathogen‐associated molecular patterns (PAMPs) by pattern recognition receptors at the cell surface initiates the first layer of host immunity against invading microbial pathogens. In plants, the immune receptor Flagellin Sensing 2 (FLS2) perceives bacterial flagellin to trigger downstream signaling that culminates in PAMP‐triggered immunity (PTI).
FLS2 protein levels are critical for effective PTI, yet the regulatory mechanisms governing its stability remain to be fully elucidated. Our previous work showed that the Arabidopsis Really Interesting Gene (RING) type ubiquitin ligase XBAT35.2 positively regulates plant immunity against bacterial pathogen Pseudomonas syringae pv tomato by promoting FLS2 stability.
In this study, we demonstrate that XBAT35.2 interacts in vivo with two key ESCRT‐I complex components, VPS37‐1 and VPS28‐2. XBAT35.2 ubiquitinates VPS37‐1 with K48‐linked polyubiquitin chains, leading to its proteasomal degradation, and modifies VPS28‐2 with K63‐linked chains, reducing its interaction with FLS2. VPS37‐1 and VPS28‐2 play redundant, negative roles in FLS2‐mediated immunity by promoting vacuolar degradation of FLS2, displaying differential effects on distinct FLS2‐mediated immune responses. By targeting VPS37‐1 and VPS28‐2, XBAT35.2 intercepts this degradative pathway, thereby stabilizing FLS2 and enhancing host immunity.
These findings uncover a novel regulatory circuit modulating FLS2 abundance and deepen our understanding of controlling the cell‐surface receptor homeostasis in plant immunity.
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BibTeX
@article{wang2026differential,
title = {{Differential ubiquitin modifications of ESCRT‐I subunits VPS37‐1 and VPS28‐2 positively regulate plant immunity}},
author = {Chaofeng Wang and Yi Zhang and Bangjun Zhou and Pooja Verma and Lirong Zeng},
journal = {The New Phytologist},
year = {2026},
month = sep,
doi = {10.1111/nph.71590},
url = {https://doi.org/10.1111/nph.71590},
note = {CC BY 4.0},
}
RIS
TY - JOUR
TI - Differential ubiquitin modifications of ESCRT‐I subunits VPS37‐1 and VPS28‐2 positively regulate plant immunity
AU - Chaofeng Wang
AU - Yi Zhang
AU - Bangjun Zhou
AU - Pooja Verma
AU - Lirong Zeng
PY - 2026
DA - 2026/09/29
JO - The New Phytologist
DO - 10.1111/nph.71590
UR - https://doi.org/10.1111/nph.71590
AB - Sensing of pathogen‐associated molecular patterns (PAMPs) by pattern recognition receptors at the cell surface initiates the first layer of host immunity against invading microbial pathogens. In plants, the immune receptor Flagellin Sensing 2 (FLS2) perceives bacterial flagellin to trigger downstream signaling that culminates in PAMP‐triggered immunity (PTI). FLS2 protein levels are critical for effective PTI, yet the regulatory mechanisms governing its stability remain to be fully elucidated. Our previous work showed that the Arabidopsis Really Interesting Gene (RING) type ubiquitin ligase XBAT35.2 positively regulates plant immunity against bacterial pathogen Pseudomonas syringae pv tomato by promoting FLS2 stability. In this study, we demonstrate that XBAT35.2 interacts in vivo with two key ESCRT‐I complex components, VPS37‐1 and VPS28‐2. XBAT35.2 ubiquitinates VPS37‐1 with K48‐linked polyubiquitin chains, leading to its proteasomal degradation, and modifies VPS28‐2 with K63‐linked chains, reducing its interaction with FLS2. VPS37‐1 and VPS28‐2 play redundant, negative roles in FLS2‐mediated immunity by promoting vacuolar degradation of FLS2, displaying differential effects on distinct FLS2‐mediated immune responses. By targeting VPS37‐1 and VPS28‐2, XBAT35.2 intercepts this degradative pathway, thereby stabilizing FLS2 and enhancing host immunity. These findings uncover a novel regulatory circuit modulating FLS2 abundance and deepen our understanding of controlling the cell‐surface receptor homeostasis in plant immunity.
SN - 0028-646X
SN - 1469-8137
ER -