Structural basis of host autophagy-related protein 8 (ATG8) binding by the Irish Potato Famine pathogen effector protein PexRD54

Maqbool, Abbas, Hughes, Richard K., Dagdas, Yasin F., Tregidgo, Nicholas, Zess, Erin, Belhaj, Khaoula, Round, Adam, Bozkurt, Tolga O., Kamoun, Sophien ORCID: and Banfield, Mark J. (2016) Structural basis of host autophagy-related protein 8 (ATG8) binding by the Irish Potato Famine pathogen effector protein PexRD54. Journal of Biological Chemistry, 291 (38). pp. 20270-20282. ISSN 0021-9258

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Filamentous plant pathogens deliver effector proteins to host cells to promote infection. The Phytophthora infestans RXLR-type effector PexRD54 binds potato ATG8 via its ATG8 family-interacting motif (AIM) and perturbs host-selective autophagy. However, the structural basis of this interaction remains unknown. Here, we define the crystal structure of PexRD54, which includes a modular architecture, including five tandem repeat domains, with the AIM sequence presented at the disordered C terminus. To determine the interface between PexRD54 and ATG8, we solved the crystal structure of potato ATG8CL in complex with a peptide comprising the effector's AIM sequence, and we established a model of the full-length PexRD54-ATG8CL complex using small angle x-ray scattering. Structure-informed deletion of the PexRD54 tandem domains reveals retention of ATG8CL binding in vitro and in planta. This study offers new insights into structure/function relationships of oomycete RXLR effectors and how these proteins engage with host cell targets to promote disease.

Item Type: Article
Additional Information: Author's Choice—Final version free via Creative Commons CC-BY license.
Uncontrolled Keywords: autophagy,host-pathogen interaction,plant molecular biology,protein structure,protein-protein interaction,effector protein,plant pathogen
Faculty \ School: Faculty of Science > The Sainsbury Laboratory
Faculty of Science > School of Biological Sciences
UEA Research Groups: Faculty of Science > Research Groups > Plant Sciences
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Depositing User: Pure Connector
Date Deposited: 12 Oct 2016 14:00
Last Modified: 03 Jul 2023 11:30
DOI: 10.1074/jbc.M116.744995


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