Oligomerization of NLR immune receptor RPP7 triggered by atypical resistance protein RPW8/HR as ligand
Year: 2019
Type: preprint
Abstract: In certain plant hybrids, autoimmunity is triggered by immune components that interact in the absence of a pathogen trigger. Often, NLR immune receptors are involved, with a particularly interesting case in Arabidopsis thaliana involving variants of the NLR RPP7 as well as variants of RPW8/HR proteins, which are homologs of animal MLKL and fungal HELL domain proteins. We demonstrate that HR4 Fei-0 but not the closely related HR4 Col-0 protein directly disrupts intramolecular association of RPP7b Lerik1-3 , which in turn initiates P-loop dependent NLR signaling. In agreement, RPP7b Lerik1-3 forms a higher-order complex only in the presence of HR4 Fei-0 but not HR4 Col-0 . In addition, we find that HR4 Fei-0 on its own can form detergent-resistant oligomers suggestive of amyloid-like aggregates, which in turn can directly kill cells in an RPP7b Lerik1-3 -independent manner. Our work provides in vivo biochemical evidence for a plant resistosome complex and the mechanisms by which RPW8/HR proteins trigger cell death.
DOI: 10.1101/682807
Authors: Lei Li, Anette Habring, Kai Wang, Detlef Weigel
Institution: Max Planck Institute for Developmental Biology
Language: English
Subfield: Plant Science
Domain: Life Sciences
Open Access status: green
OpenAlex ID: W4243039810