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The rice receptor-like cytoplasmic kinase 185 (OsRLCK185) interacts with the chitin receptor complex OsCERK1/CEBiP and positively regulates chitin-induced immune responses including MAP kinase activation, ROS production and defense gene expression. To elucidate the regulatory mechanisms of OsRLCK185-mediated immunity, we searched for interactors of OsRLCK185. OsDRE2a, rice homologs of the yeast Dre2 protein, were identified as novel interactors of OsRLCK185. OsDRE2a interacted with OsRLCK185 at plasma membrane. The conserved cysteine residues in CIAPIN1 domain of OsDRE2a were essential for tight interaction of OsRLCK185. OsDRE2a was phosphorylated by OsRLCK185. The expression of OsDRE2a and OsDRE2b was induced after chitin treatment. Reduction of OsDRE2a and OsDRE2b mRNA levels by RNA interference resulted in the decreased chitin-induced ROS production. Thus, it is likely that OsDRE2 regulates OsRLCK185-mediated immune responses. [ABSTRACT FROM AUTHOR]

The article focuses on a study on the suppression of rice immunity by Xanthomonas oryzae Type III Effector Xoo2875. It states that transgenic rice plants expressing Xoo2875 exhibited semi-dwarfism. It mentions that in the study, it was found that the virulent activity of Xoo2875 is mediated by its interaction with OsBAKl, an essential component of microbe-associated molecular patterns (MAMPs) and brassinosteroid (BR) receptors.