Serine/threonine-protein kinase that plays a central role in centriole duplication. Able to trigger procentriole formation on the surface of the parental centriole cylinder, leading to the recruitment of centriole biogenesis proteins such as SASS6, CENPJ/CPAP, CCP110, CEP135 and gamma-tubulin. When overexpressed, it is able to induce centrosome amplification through the simultaneous generation of multiple procentrioles adjoining each parental centriole during S phase. Phosphorylates 'Ser-151' of FBXW5 during the G1/S transition, leading to inhibit FBXW5 ability to ubiquitinate SASS6. Its central role in centriole replication suggests a possible role in tumorigenesis, centrosome aberrations being frequently observed in tumors. Phosphorylates CDC25C and CHEK2. Also involved in deuterosome-mediated centriole amplification in multiciliated that can generate more than 100 centrioles. Also involved in trophoblast differentiation by phosphorylating HAND1, leading to disrupt the interaction between HAND1 and MDFIC and activate HAND1. Required for the recruitment of STIL to the centriole and for STIL-mediated centriole amplification (By similarity). Phosphorylates CEP131 at 'Ser-78' and PCM1 at 'Ser-372' which is essential for proper organization and integrity of centriolar satellites (By similarity). ATP + L-seryl-[protein] = ADP + H(+) + O-phospho-L-seryl-[protein] ATP + L-threonyl-[protein] = ADP + H(+) + O-phospho-L-threonyl-[protein] Homodimer (PubMed:12352953). Interacts with CEP152 (via N-terminus) (By similarity). Interacts with CEP78; this interaction may be important for proper PLK4 localization to the centriole and PLK4-induced overduplication of centrioles (By similarity). Interacts with CEP131 (By similarity). Interacts simultaneously with TENT5C and CEP192. Interacts with TENT5C; this interaction leads to the TENT5C recruitment in the centrosome (By similarity). Associates with centrioles throughout the cell cycle. According to PubMed:11301255, it localizes to the nucleolus during G2, to the centrosomes in G2/M, and to the cleavage furrow during cytokinesis. Component of the deuterosome, a structure that promotes de novo centriole amplification in multiciliated cells that can generate more than 100 centrioles. expressed in tissues associated with mitotic and meiotic cell division. Highly expressed in testis. Cryptic POLO box 1 (CPB1) and Cryptic POLO box 2 (CPB2) domains can simultaneously bind to both TENT5C and CEP192. Ubiquitinated; leading to its degradation by the proteasome. Tyrosine-phosphorylated by TEC. Acetylation by KAT2A and KAT2B impairs kinase activity by shifting the kinase to an inactive conformation. Death during embryogenesis. Embryos arrest after gastrulation at E7.5, with a marked increase in mitotic and apoptotic cells. Heterozygous mice are viable but show increased liver and lung cancers in elderly mice. Defects in heterozygous mice are associated with progressive cell cycle delays, increased spindle irregularities and accelerated hepatocellular carcinogenesis, probably due to increased centrosomal amplification, multipolar spindle formation and aneuploidy. The incidence of spontaneous. Belongs to the protein kinase superfamily. Ser/Thr protein kinase family. CDC5/Polo subfamily.