Receptor-like serine/threonine-protein kinase that represses the disease resistance signaling pathway triggered in response to bacterial pathogen such as Pseudomonas syringae pv. tomato. ATP + L-seryl-[protein] = ADP + H(+) + O-phospho-L-seryl-[protein] ATP + L-threonyl-[protein] = ADP + H(+) + O-phospho-L-threonyl-[protein] Interacts with PUB9, PUB13 and PUB14. Binds to calmodulin (CaM) in a Ca(2+)-dependent manner. Mostly expressed in rosette leaves, and, to a lower extent, in cauline leaves and stems. By P.syringae and salicylic acid (SA). Autophosphorylated. Enhanced resistances to the virulent bacterial pathogen P.syringae pv. tomato accompanied by an increase in PR1 expression. Belongs to the protein kinase superfamily. Ser/Thr protein kinase family.