The integrated LIM-peptidase domain of the CSA1/CHS3 paired immune receptor detects changes in DA1 family peptidase inhibitors to confer Albugo candida resistance in Arabidopsis.
Gu, B.; Parkes, T.; Smith, C.; Lu, F.-H.; McKenzie, N.; Dong, H.; Jones, J. D. G.; Cevik, V.; Bevan, M. W.
Show abstract
White blister rust, caused by the oomycete Albugo candida, is a widespread disease of Brassica crops. The Arabidopsis CSA1/DAR4 (also known as CSA1/CHS3) paired immune receptor carries an Integrated Domain (ID) with homology to the DA1 family of peptidases. Using domain swaps with DA1 family members, we show that the DAR4 ID acts as an integrated decoy for DAR3, which interacts with and inhibits the peptidase activities of DA1, DAR1 and DAR2 family members. Albugo infection rapidly lowered DAR3 levels and activates DA1 peptidase activity. This promotes endoreduplication of host tissues to support pathogen growth. We propose that DAR4/CSA1 senses the actions of a putative Albugo effector that reduces DAR3 levels and initiates defense.
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