Positive regulator of hypersensitive response (HR)-like cell death. May be involved in potassium ion channel regulation. Self-interacts and forms heteromers (Ref.8). Interacts with NB-LRR class of R proteins before R proteins (e.g. RPS2 or RPM1) are activated by the effectors (Ref.8). Interacts with LRR1 (PubMed:19712067).