Abstract

Macroautophagy/autophagy and the ubiquitin-proteasome system (UPS) are major proteolytic pathways that are increasingly recognized as battlegrounds during host-microbe interactions in eukaryotes. In plants, the UPS has emerged as central component of innate immunity and is manipulated by bacterial pathogens to enhance virulence. Autophagy has been ascribed a similar importance for anti-bacterial immunity in animals, but the contribution of autophagy to host-bacteria interactions remained elusive in plants. Here, we present and discuss our recent findings that revealed anti- and pro-bacterial roles of autophagy pathways during bacterial infection in the model plant Arabidopsis thaliana. We discovered that selective autophagy mediated by the autophagy cargo receptor AT4G24690/NBR1 limits growth of Pseudomonas syringae pv. tomato DC3000 (Pst) by suppressing the establishment of an aqueous extracellular space (water-soaking'). In turn, Pseudomonas employs the effector protein HopM1 to activate autophagy and proteasome degradation (proteaphagy'), thereby enhancing its pathogenicity. Thus, our study demonstrates that distinct selective autophagy pathways contribute to host immunity and bacterial pathogenesis during Pst infection and provide evidence for an intimate crosstalk between the proteasome and autophagy system in plant-bacterial interactions.

Keywords

Innate immunity; NBR1; plant bacterium; proteaphagy; Pseudomonas syringae; selective autophagy

Published in

Autophagy
2018, Volume: 14, number: 8, pages: 1465-1466
Publisher: TAYLOR & FRANCIS INC

SLU Authors

• Üstün, Suayib

  • Department of Plant Biology, Swedish University of Agricultural Sciences
    

• Hofius, Daniel

  • Department of Plant Biology, Swedish University of Agricultural Sciences
    

UKÄ Subject classification

Cell Biology


Publication identifier

DOI: https://doi.org/10.1080/15548627.2018.1475817

Permanent link to this page (URI)

https://res.slu.se/id/publ/96608