This family represents the C-terminus (approximately 250 residues) of protein ENHANCED DISEASE RESISTANCE 2 (EDR2) from plants. EDR2 is a negative regulator of the salicylic acid (SA)-mediated resistance to pathogens, including the biotrophic powdery mildew pathogens Golovinomyces cichoracearum and Blumeria graminis, and the downy mildew pathogen Hyaloperonospora parasitica, probably by limiting the initiation of cell death and the establishment of the hypersensitive response (HR) [1,2].

1: Regulation of plant defense responses in Arabidopsis by EDR2, a PH and START domain-containing protein. Tang D, Ade J, Frye CA, Innes RW; Plant J. 2005;44:245-257. PMID:16212604

2: EDR2 negatively regulates salicylic acid-based defenses and cell death during powdery mildew infections of Arabidopsis thaliana. Vorwerk S, Schiff C, Santamaria M, Koh S, Nishimura M, Vogel J, Somerville C, Somerville S; BMC Plant Biol. 2007;7:35. PMID:17612410