The receptor kinase FER is a RALF-regulated scaffold controlling plant immune signaling

Martin Stegmann (Lead Author), Jacqueline Monaghan, Elwira Smakowska-Luzan, Hanna Rovenich, Anita Lehner, Nicholas Holton, Youssef Belkhadir, Cyril Zipfel

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In plants, perception of invading pathogens involves cell-surface immune receptor kinases. Here, we report that the Arabidopsis SITE-1 PROTEASE (S1P) cleaves endogenous RAPID ALKALINIZATION FACTOR (RALF) propeptides to inhibit plant immunity. This inhibition is mediated by the malectin-like receptor kinase FERONIA (FER), which otherwise facilitates the ligand-induced complex formation of the immune receptor kinases EF-TU RECEPTOR (EFR) and FLAGELLIN-SENSING 2 (FLS2) with their co-receptor BRASSINOSTEROID INSENSITIVE 1-ASSOCIATED KINASE 1 (BAK1) to initiate immune signaling. We show that FER acts as a RALF-regulated scaffold modulating receptor kinase complex assembly. A similar scaffolding mechanism may underlie RALF function in other signalling pathways.
Original languageEnglish
Pages (from-to)287-289
Number of pages3
Issue number6322
Publication statusPublished - 20 Jan 2017

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