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- W2890772005 abstract "Crop diseases caused by fungi constitute one of the most important problems in agriculture, posing a serious threat to food security [1]. To establish infection, phytopathogens interfere with plant immune responses [2, 3]. However, strategies to promote virulence employed by fungal pathogens, especially non-model organisms, remain elusive [4], mainly because fungi are more complex and difficult to study when compared to the better-characterized bacterial pathogens. Equally incomplete is our understanding of the birth of microbial virulence effectors. Here, we show that the cacao pathogen Moniliophthora perniciosa evolved an enzymatically inactive chitinase (MpChi) that functions as a putative pathogenicity factor. MpChi is among the most highly expressed fungal genes during the biotrophic interaction with cacao and encodes a chitinase with mutations that abolish its enzymatic activity. Despite the lack of chitinolytic activity, MpChi retains substrate binding specificity and prevents chitin-triggered immunity by sequestering immunogenic chitin fragments. Remarkably, its sister species M. roreri encodes a second non-orthologous catalytically impaired chitinase with equivalent function. Thus, a class of conserved enzymes independently evolved as putative virulence factors in these fungi. In addition to unveiling a strategy of host immune suppression by fungal pathogens, our results demonstrate that the neofunctionalization of enzymes may be an evolutionary pathway for the rise of new virulence factors in fungi. We anticipate that analogous strategies are likely employed by other pathogens." @default.
- W2890772005 created "2018-09-27" @default.
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- W2890772005 date "2018-09-01" @default.
- W2890772005 modified "2023-10-16" @default.
- W2890772005 title "Suppression of Plant Immunity by Fungal Chitinase-like Effectors" @default.
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- W2890772005 doi "https://doi.org/10.1016/j.cub.2018.07.055" @default.
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