ArticleStress biology2025
A CNL protein forms an NLR pair with NRCX to modulate plant immunity.
Article in Stress biology, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Nucleotide-binding leucine-rich repeat (NLR) proteins assemble into genetically linked pairs to mediate effector-triggered immunity (ETI) in plants. Here, we characterize the paired NLRs NRCX and NARY (NRCX adjacent resistance gene Y) in Nicotiana benthamiana. CRISPR/Cas9 knockout of NRCX caused severe dwarfism and constitutively activated immunity, marked by PR1 upregulation and enhanced resistance to Phytophthora capsici. Co-silencing or double knockout of the adjacent NLR NARY partially rescued the nrcx phenotype, revealing NARY as a compensatory regulator that modulates growth and immunity. Structural analysis revealed that NARY harbors non-canonical Walker B and MHD motifs, which lack autoactivation capacity despite their divergence from canonical NLR executors. Split-luciferase and co-immunoprecipitation assays showed that NRCX and NARY interact exclusively through their CC domains, forming a non-canonical regulatory complex. Notably, simultaneous silencing of NRC2/3 and NARY incompletely restored growth in nrcx mutants, implicating additional factors in immune modulation. Our findings establish NARY as a compensatory NLR partner of NRCX that fine-tunes immunity without triggering cell death, revealing a novel mechanism for balancing growth and defense in Solanaceae.
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