The work uncovers a direct functional link between an atypical immune receptor and a crucial component of early immune signaling: increased immunity in exo70B1 depends on TN2 and CPK5 and in a positive feedback loop TN2 keeps CPK5 enzymatically active beyond the initiating stimulus.
Transiently expressed RIN4 but not the plasma membrane (PM) protein aquaporin PIP2 recruits EXO70B1 to the plasma membrane (PM). Unlike EXO70B1 RIN4 does not recruit the core exocyst subunit SEC6 to the PM under these conditions.
Our data are consistent with a speculative model wherein pathogen effectors could evolve to target EXO70B1 to manipulate plant secretion machinery. TN2 could monitor EXO70B1 integrity as part of an immune receptor complex
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