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FEBS Lett. 2000 Jul 14;477(1-2):106-12.

Cloning and characterization of rat casein kinase 1epsilon.

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  • 1Division of Protein Metabolism, Institute for Protein Research, Osaka University, 3-2 Yamado-Oka, Suita, Osaka, Japan.


Genes differentially expressed in the subjective day and night in the rat suprachiasmatic nucleus (SCN) were surveyed by differential display. A gene homologous to human casein kinase 1epsilon (CK1epsilon) was isolated, which initially appeared to be expressed in the suprachiasmatic nucleus (SCN) in a circadian manner. We here describe the cDNA cloning of the rat CK1epsilon and characterization of the protein products. The rCK1epsilon is predominantly expressed in the brain including the SCN, binds and phosphorylates mPer1, mPer2, and mPer3 in vitro, and translocates mPer1 and mPer3, but not mPer2, to the cell nucleus depending on its kinase activity when coexpressed with these Per proteins in COS-7 cells.

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