Coiled-coil and RPW8-type immune receptors function at the plasma membrane in a phospholipid dependent manner
Saile, S. C.; Ackermann, F. M.; Sunil, S.; Bayless, A.; Stoebbe, E.; Bonardi, V.; Wan, L.; Doumane, M.; Jaillais, Y.; Caillaud, M.-C.; Dangl, J. L.; Nishimura, M. T.; El Kasmi, F.
Show abstract
Activation of intracellular nucleotide-binding leucine-rich repeat receptors (NLRs) results in immunity and a localized cell death response of infected cells. Cell death activity of many NLRs requires oligomerization and in some cases plasma membrane (PM) localization. However, the exact mechanisms underlying PM localization of NLRs lacking recognizable N- or C-terminal lipidation motifs or predicted transmembrane domains remains elusive. Here we show that the PM localization and stability of members of the RPW8-like coiled-coil (CCR) domain NLRs (RNLs) and a CC-type NLR (CNL) depend on the interaction with PM phospholipids. Depletion of phosphatidylinositol-4-phosphate (PI4P) from the PM led to a mislocalization of the analyzed NLRs and consequently inhibited their cell death activity. We further demonstrate activation-dependent self-association of cell death inducing RNLs. Our results provide new insights into the molecular mechanism of NLR PM localization and defines an important role of phospholipids for CNL and RNL activity during immunity.
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