Plant immunity: the EDS1 regulatory node

Curr Opin Plant Biol. 2005 Aug;8(4):383-9. doi: 10.1016/j.pbi.2005.05.010.


ENHANCED DISEASE SUSCEPTIBILITY 1 (EDS1) and its interacting partner, PHYTOALEXIN DEFICIENT 4 (PAD4), constitute a regulatory hub that is essential for basal resistance to invasive biotrophic and hemi-biotrophic pathogens. EDS1 and PAD4 are also recruited by Toll-Interleukin-1 receptor (TIR)-type nucleotide binding-leucine rich repeat (NB-LRR) proteins to signal isolate-specific pathogen recognition. Recent work points to a fundamental role of EDS1 and PAD4 in transducing redox signals in response to certain biotic and abiotic stresses. These intracellular proteins are important activators of salicylic acid (SA) signaling and also mediate antagonism between the jasmonic acid (JA) and ethylene (ET) defense response pathways. EDS1 forms several molecularly and spatially distinct complexes with PAD4 and a newly discovered in vivo signaling partner, SENESCENCE ASSOCIATED GENE 101 (SAG101). Together, EDS1, PAD4 and SAG101 provide a major barrier to infection by both host-adapted and non-host pathogens.

Publication types

  • Research Support, Non-U.S. Gov't
  • Review

MeSH terms

  • Arabidopsis / immunology*
  • Arabidopsis / metabolism
  • Arabidopsis Proteins / metabolism
  • Arabidopsis Proteins / physiology*
  • Carboxylic Ester Hydrolases / metabolism
  • Carboxylic Ester Hydrolases / physiology*
  • DNA-Binding Proteins / metabolism
  • DNA-Binding Proteins / physiology*
  • Gene Expression Regulation, Plant
  • Oxidative Stress
  • Plant Diseases*
  • Signal Transduction


  • Arabidopsis Proteins
  • DNA-Binding Proteins
  • EDS1 protein, Arabidopsis
  • Carboxylic Ester Hydrolases
  • PAD4 protein, Arabidopsis