“…In the plant pathogen Pseudomonas syringae, the HopZ1 subfamily is represented by three closely related alleles, HopZ1a, HopZ1b, and HopZ1c, that diversified under pressure from the host immune system (10). The most phylogenetically basal representative of this subfamily, HopZ1a, is recognized in Arabidopsis by the ZAR1 NB-LRR protein (16,17) as well as by unidentified proteins in rice, Nicotiana benthamiana, sesame, and soybean (10). Like YopJ, HopZ1a is an acetyltransferase and can promote pathogen growth in Arabidopsis plants lacking the ZAR1 NB-LRR protein.…”