Serine/threonine-kinase of unknown function. ATP + L-seryl-[protein] = ADP + H(+) + O-phospho-L-seryl-[protein] ATP + L-threonyl-[protein] = ADP + H(+) + O-phospho-L-threonyl-[protein] Interacts with TMK4/BARK1 (PubMed:23921992). Autophosphorylated. Belongs to the protein kinase superfamily. Ser/Thr protein kinase family.