Brassinosteroid insensitive 1 (BR1)-associated receptor-like kinase 1 (BAK1) is spontaneously glutathionylated in vitro by GSSG or GSH plus H2O2. The glutaredoxin (GRX) AtGRXC2 (GRX C2) interacts with and can catalyse glutathionylation of the BAK1 in vitro. Potential redox control of BAK1 and a novel activity for plant GRXs are discussed.

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