TITLE:
Structural and Functional Insights into an Arabidopsis NBS-LRR Receptor in Nicotiana benthamiana
AUTHORS:
Jianzhong Huang, Xiuying Guan, Xiaoju Zhong, Peng Jia, Hongbin Zhang, Honglei Ruan
KEYWORDS:
CC-NBS-LRR, Hypersensitive Response, Nicotiana benthamiana, Plasma Membrane Localization
JOURNAL NAME:
American Journal of Molecular Biology,
Vol.14 No.2,
April
18,
2024
ABSTRACT: Nucleotide-binding site leucine-rich repeat receptors (NBS-LRR/NLRs) are crucial intracellular immune proteins in plants. Previous article reported a novel NLR protein SUT1 (SUPPRESSORS OF TOPP4-1, 1), which is involved in autoimmunity initiated by type one protein phosphatase 4 mutation (topp4-1) in Arabidopsis, however, its role in planta is still unclear. This study employed Nicotiana benthamiana, a model platform, to conduct an overall structural and functional analysis of SUT1 protein. The transient expression results revealed that SUT1 is a typical CNL (CC-NBS-LRR) receptor, both fluorescence data and biochemical results showed the protein is mainly anchored on the plasma membrane due to its N-terminal acylation site. Further truncation experiments announced that its CC (coiled-coil) domain possessed cell-death-inducing activity. The outcomes of point mutations analysis revealed that not only the CC domain, but also the full-length SUT1 protein, whose function and subcellular localization are influenced by highly conserved hydrophobic residues. These research outcomes provided favorable clues for elucidating the activation mechanism of SUT1.