Involved in centrosome biogenesis. Seems to be required for recruitment of centrosomal material and might be involved in de novo centrosome formation. 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. NEK Ser/Thr protein kinase family. NIMA subfamily.