Essential PPIase that regulates mitosis presumably by interacting with NIMA and attenuating its mitosis-promoting activity. Displays a preference for an acidic residue N-terminal to the isomerized proline bond. Catalyzes pSer/Thr-Pro cis/trans isomerizations. Down-regulates kinase activity of BTK. Can transactivate multiple oncogenes and induce centrosome amplification, chromosome instability and cell transformation Required for the efficient dephosphorylation and recycling of RAF1 after mitogen activation
Tissue Specificity
The phosphorylated form at Ser-71 is expressed in normal breast tissue cells but not in breast cancer cells
Cellular Localization
Nucleus. Nucleus speckle. Cytoplasm. Note=Co-localizes with NEK6 in the nucleus. Mainly localized in the nucleus but phosphorylation at Ser-71 by DAPK1 results in inhibition of its nuclear localization