Involved in the development of the fruiting body. Overexpression phenocopies the spnA null phenotype. ATP + L-seryl-[protein] = ADP + H(+) + O-phospho-L-seryl-[protein] ATP + L-threonyl-[protein] = ADP + H(+) + O-phospho-L-threonyl-[protein] Localized in the subcortical region of the cell with some enrichment in cell protrusions. In developed cells, colocalized with spnA. May translocate to the nucleus in response to a regulatory signal. Not detected during axenic growth. Induced during aggregation with 2 peaks, one at 8 hours at the end of aggregation and one at 15 hours during later morphogenesis. Preferentially expressed in a subclass of prestalk cells. Null cells show weak and late developmental defects. Belongs to the protein kinase superfamily. TKL Ser/Thr protein kinase family.