Serine/threonine-protein kinase that may function as a signaling receptor of extracellular matrix component. ATP + L-seryl-[protein] = ADP + H(+) + O-phospho-L-seryl-[protein] ATP + L-threonyl-[protein] = ADP + H(+) + O-phospho-L-threonyl-[protein] Belongs to the protein kinase superfamily. Ser/Thr protein kinase family. Lacks the calcium-binding EGF-like domain which is a conserved feature of the wall-associated receptor kinase family.