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Nat Plants ; 2: 15218, 2016 01 25.
Article in English | MEDLINE | ID: mdl-27250875

ABSTRACT

Precise control of cell death is essential for the survival of all organisms. Arabidopsis thaliana BRASSINOSTEROID INSENSITIVE 1-associated receptor kinase 1 (BAK1) and somatic embryogenesis receptor kinase 4 (SERK4) redundantly and negatively regulate cell death through elusive mechanisms. By deploying a genetic screen for suppressors of cell death triggered by virus-induced gene silencing of BAK1/SERK4 on Arabidopsis knockout collections, we identified STT3a, a protein involved in N-glycosylation modification, as an important regulator of bak1/serk4 cell death. Systematic investigation of glycosylation pathway and endoplasmic reticulum (ER) quality control (ERQC) components revealed distinct and overlapping mechanisms of cell death regulated by BAK1/SERK4 and their interacting protein BIR1. Genome-wide transcriptional analysis revealed the activation of members of cysteine-rich receptor-like kinase (CRK) genes in the bak1/serk4 mutant. Ectopic expression of CRK4 induced STT3a/N-glycosylation-dependent cell death in Arabidopsis and Nicotiana benthamiana. Therefore, N-glycosylation and specific ERQC components are essential to activate bak1/serk4 cell death, and CRK4 is likely to be among client proteins of protein glycosylation involved in BAK1/SERK4-regulated cell death.


Subject(s)
Arabidopsis Proteins/metabolism , Arabidopsis/genetics , Gene Expression Regulation, Plant , Protein Kinases/metabolism , Protein Serine-Threonine Kinases/metabolism , Arabidopsis/cytology , Arabidopsis/enzymology , Arabidopsis/physiology , Arabidopsis Proteins/genetics , Cell Death , Gene Expression Profiling , Glycosylation , Mutation , Phenotype , Plant Leaves/cytology , Plant Leaves/enzymology , Plant Leaves/genetics , Plant Leaves/physiology , Plant Roots/cytology , Plant Roots/enzymology , Plant Roots/genetics , Plant Roots/physiology , Protein Kinases/genetics , Protein Serine-Threonine Kinases/genetics , Seedlings/cytology , Seedlings/enzymology , Seedlings/genetics , Seedlings/physiology
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