Primary Citation of Related Structures: 4B8V, 4B9H
PubMed Abstract:
While host immune receptors detect pathogen-associated molecular patterns to activate immunity, pathogens attempt to deregulate host immunity through secreted effectors. Fungi employ LysM effectors to prevent recognition of cell wall-derived chitin by host immune receptors, although the mechanism to compete for chitin binding remained unclear ...
While host immune receptors detect pathogen-associated molecular patterns to activate immunity, pathogens attempt to deregulate host immunity through secreted effectors. Fungi employ LysM effectors to prevent recognition of cell wall-derived chitin by host immune receptors, although the mechanism to compete for chitin binding remained unclear. Structural analysis of the LysM effector Ecp6 of the fungal tomato pathogen Cladosporium fulvum reveals a novel mechanism for chitin binding, mediated by intrachain LysM dimerization, leading to a chitin-binding groove that is deeply buried in the effector protein. This composite binding site involves two of the three LysMs of Ecp6 and mediates chitin binding with ultra-high (pM) affinity. Intriguingly, the remaining singular LysM domain of Ecp6 binds chitin with low micromolar affinity but can nevertheless still perturb chitin-triggered immunity. Conceivably, the perturbation by this LysM domain is not established through chitin sequestration but possibly through interference with the host immune receptor complex. DOI:http://dx.doi.org/10.7554/eLife.00790.001.
Related Citations:
Conserved Fungal Lysm Effector Ecp6 Prevents Chitin-Triggered Immunity in Plants. De Jonge, R., Van Esse, H.P., Kombrink, A., Shinya, T., Desaki, Y., Bours, R., Van Der Krol, S., Shibuya, N., Joosten, M.H.A.J., Thomma, B.P.H.J. (2010) Science 329: 953
Organizational Affiliation:
Centro de Biotecnología y Genómica de Plantas , Universidad Politécnica de Madrid , Madrid , Spain ; Laboratory of Phytopathology , Wageningen University , Wageningen , Netherlands.
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