Avirulence protein ATR1 is a secreted effector that acts as an elicitor of hypersensitive response (HR) specifically on plants. It activates the N-terminal Toll-interleukin-1 receptor (TIR) domain of Arabidopsis NLR RPP1 [1]. This entry represents the C-terminal helical domain, referred to as the WY-domain.

1: Direct pathogen-induced assembly of an NLR immune receptor complex to form a holoenzyme. Ma S, Lapin D, Liu L, Sun Y, Song W, Zhang X, Logemann E, Yu D, Wang J, Jirschitzka J, Han Z, Schulze-Lefert P, Parker JE, Chai J; Science. 2020; [Epub ahead of print] PMID:33273071