Serine/threonine protein kinase involved in the regulation of exocytosis. Induces phosphorylation of SEC9 and its release from the plasma membrane to the cytosol. ATP + L-seryl-[protein] = ADP + H(+) + O-phospho-L-seryl-[protein] ATP + L-threonyl-[protein] = ADP + H(+) + O-phospho-L-threonyl-[protein] Interacts with SEC9 and SRO7. Belongs to the protein kinase superfamily. CAMK Ser/Thr protein kinase family. NIM1 subfamily.