Overview:

Polo-like kinase (PLK) plays an important role in cell cycle regulation. PLK is also required for bipolar spindle formation, activation of the anaphase-promoting complex/cyclosome, and cytokinesis. Deregulation of PLKs often results in abnormalities in centrosome duplication, maturation and/or microtubule dynamics (1). STK10-a, which is also known as PLKK is likely responsible for activating PLK. STK10-a itself is activated by phosphorylation at Ser482, Ser486 and Ser490 (2).

References:

1. Nigg, EA. et al: Dynamic changes in nuclear architecture during mitosis: on the role of protein phosphorylation in spindle assembly and chromosome segregation. Exp Cell Res. 1996 Dec 15;229

2. Erikson E et al. A feedback loop in the polo-like kinase activation pathway. J Biol Chem. 2004, 279:32219-32224.