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- W4200291292 abstract "Abstract Pathenogenesis-related (PR) proteins are extensively used as molecular markers to dissect the signaling cascades leading to plant defense responses. However, studies focusing on the biochemical or biological properties of these proteins remain rare. Here, we identify and characterize a class of apple (Malus domestica) PR proteins, named M. domestica AGGLUTININS (MdAGGs), belonging to the amaranthin-like lectin family. By combining molecular and biochemical approaches, we show that abundant production of MdAGGs in leaf tissues corresponds with enhanced resistance to the bacterium Erwinia amylovora, the causal agent of the disease fire blight. We also show that E. amylovora represses the expression of MdAGG genes by injecting the type 3 effector DspA/E into host cells and by secreting bacterial exopolysaccharides. Using a purified recombinant MdAGG, we show that the protein agglutinates E. amylovora cells in vitro and binds bacterial lipopolysaccharides at low pH, conditions reminiscent of the intercellular pH occurring in planta upon E. amylovora infection. We finally provide evidence that negatively charged polysaccharides, such as the free exopolysaccharide amylovoran progressively released by the bacteria, act as decoys relying on charge–charge interaction with the MdAGG to inhibit agglutination. Overall, our results suggest that the production of this particular class of PR proteins may contribute to apple innate immunity mechanisms active against E. amylovora." @default.
- W4200291292 created "2021-12-31" @default.
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- W4200291292 date "2021-11-22" @default.
- W4200291292 modified "2023-10-16" @default.
- W4200291292 title "Search for host defense markers uncovers an apple agglutination factor corresponding with fire blight resistance" @default.
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- W4200291292 doi "https://doi.org/10.1093/plphys/kiab542" @default.
- W4200291292 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/34904175" @default.
- W4200291292 hasPublicationYear "2021" @default.
- W4200291292 type Work @default.