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Crh proteins catalyze crosslinking of chitin and glucan polymers in fungal cell walls. Here, we show that the BcCrh1 protein from the phytopathogenic fungus  Botrytis cinerea  acts as a cytoplasmic effector and elicitor of plant defense. BcCrh1 is localized in vacuoles and the endoplasmic reticulum during saprophytic growth. However, upon plant infection, the protein accumulates in infection cushions; it is then secreted to the apoplast and translocated into plant cells, where it induces cell death and defense responses. Two regions of 53 and 35 amino acids are sufficient for protein uptake and cell death induction, respectively. BcCrh1 mutant variants that are unable to dimerize lack transglycosylation activity, but are still able to induce plant cell death. Furthermore,  Arabidopsis  lines expressing the  bccrh1  gene exhibit reduced sensitivity to  B. cinerea , suggesting a potential use of the BcCrh1 protein in plant immunization against this necrotrophic pathogen.

The Botrytis cinerea Crh1 transglycosylase is a cytoplasmic effector triggering plant cell death and defense response