title: ER quality control components UGGT and STT3a are required for activation of defense responses in bir1-1.
abstract: The receptor-like kinase SUPPRESSOR OF BIR1, 1 (SOBIR1) functions as a critical regulator in plant immunity. It is required for activation of cell death and defense responses in Arabidopsis bak1-interacting receptor-like kinase 1,1 (bir1-1) mutant plants. Here we report that the ER quality control component UDP-glucose:glycoprotein glucosyltransferase (UGGT) is required for the biogenesis of SOBIR1 and mutations in UGGT suppress the spontaneous cell death and constitutive defense responses in bir1-1. Loss of function of STT3a, which encodes a subunit of the oligosaccharyltransferase complex, also suppresses the autoimmune phenotype in bir1-1. However, it has no effect on the accumulation of SOBIR1, suggesting that additional signaling components other than SOBIR1 may be regulated by ER quality control. Our study provides clear evidence that ER quality control play critical roles in regulating defense activation in bir1-1.
authors.affiliation: Department of Botany, University of British Columbia, Vancouver, Canada.
authors.forename: Qian
authors.initials: Q
authors.lastname: Zhang
authors.affiliation: Department of Botany, University of British Columbia, Vancouver, Canada.
authors.forename: Tongjun
authors.initials: T
authors.lastname: Sun
authors.affiliation: Department of Botany, University of British Columbia, Vancouver, Canada.
authors.forename: Yuelin
authors.initials: Y
authors.lastname: Zhang
mesh_terms: D017360:Arabidopsis / Q000235:genetics / Q000276:immunology / Q000378:metabolism; D029681:Arabidopsis Proteins / Q000235:genetics / Q000378:metabolism*; D060467:Disease Resistance / Q000235:genetics / Q000276:immunology; D004721:Endoplasmic Reticulum / Q000378:metabolism*; D023061:Gene Order; D056426:Genetic Loci; D005964:Glucosyltransferases / Q000378:metabolism*; D006602:Hexosyltransferases / Q000378:metabolism*; D009154:Mutation; D010641:Phenotype; D057865:Plant Immunity / Q000235:genetics; D011494:Protein Kinases / Q000378:metabolism*; D011499:Protein Processing, Post-Translational
chemical_list: D029681:Arabidopsis Proteins; D005964:Glucosyltransferases; D006602:Hexosyltransferases; D011494:Protein Kinases; C000593371:SOBIR protein, Arabidopsis