Chloroplastic Protein NRIP1 Mediates Innate Immune Receptor Recognition of a Viral Effector

نویسندگان

  • Jeffrey L. Caplan
  • Padmavathi Mamillapalli
  • Tessa M. Burch-Smith
  • Kirk Czymmek
  • S. P. Dinesh-Kumar
چکیده

Plant innate immunity relies on the recognition of pathogen effector molecules by nucleotide-binding-leucine-rich repeat (NB-LRR) immune receptor families. Previously we have shown the N immune receptor, a member of TIR-NB-LRR family, indirectly recognizes the 50 kDa helicase (p50) domain of Tobacco mosaic virus (TMV) through its TIR domain. We have identified an N receptor-interacting protein, NRIP1, that directly interacts with both N's TIR domain and p50. NRIP1 is a functional rhodanese sulfurtransferase and is required for N to provide complete resistance to TMV. Interestingly, NRIP1 that normally localizes to the chloroplasts is recruited to the cytoplasm and nucleus by the p50 effector. As a consequence, NRIP1 interacts with N only in the presence of the p50 effector. Our findings show that a chloroplastic protein is intimately involved in pathogen recognition. We propose that N's activation requires a prerecognition complex containing the p50 effector and NRIP1.

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عنوان ژورنال:
  • Cell

دوره 132  شماره 

صفحات  -

تاریخ انتشار 2008