Microbial plant pathogens secrete effector proteins, which manipulate the host to promote infection. Effectors can be recognized by intracellular nucleotide-binding leucine-rich repeat (NLR) receptors, initiating an immune response. The AVR-Pik from rice blast fungus Magnaporthe oryzae is a pair of NLR Pik-1 and Pik-2. contains noncanonical integrated heavy-metal-associated (HMA) domain, direct...