MCB
Home Help [Feedback] [For Subscribers] [Archive] [Search] [Contents]
This Article
Right arrow Full Text
Right arrow Full Text (PDF)
Right arrow Alert me when this article is cited
Right arrow Alert me if a correction is posted
Services
Right arrow Similar articles in this journal
Right arrow Similar articles in PubMed
Right arrow Alert me to new issues of the journal
Right arrow Download to citation manager
Right arrowReprints and Permissions
Right arrow Copyright Information
Right arrow Books from ASM Press
Right arrow MicrobeWorld
Citing Articles
Right arrow Citing Articles via HighWire
Right arrow Citing Articles via Google Scholar
Google Scholar
Right arrow Articles by Akashi, M.
Right arrow Articles by Nishida, E.
Right arrow Search for Related Content
PubMed
Right arrow PubMed Citation
Right arrow Articles by Akashi, M.
Right arrow Articles by Nishida, E.

 Previous Article  |  Next Article 

Molecular and Cellular Biology, March 2002, p. 1693-1703, Vol. 22, No. 6
0270-7306/02/$04.00+0     DOI: 10.1128/MCB.22.6.1693-1703.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.

Control of Intracellular Dynamics of Mammalian Period Proteins by Casein Kinase I {varepsilon} (CKI{varepsilon}) and CKI{delta} in Cultured Cells

Makoto Akashi,1 Yoshiki Tsuchiya,2 Takao Yoshino,2 and Eisuke Nishida1,2*

Department of Biophysics, Graduate School of Science,1 Department of Cell and Developmental Biology, Graduate School of Biostudies, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan2

Received 25 July 2001/ Returned for modification 20 August 2001/ Accepted 4 December 2001

Recent studies have shown that casein kinase I {varepsilon} (CKI{varepsilon}) is an essential regulator of the mammalian circadian clock. However, the detailed mechanisms by which CKI{varepsilon} regulates each component of the circadian negative-feedback loop have not been fully defined. We show here that mPer proteins, negative limbs of the autoregulatory loop, are specific substrates for CKI{varepsilon} and CKI{delta}. The CKI phosphorylation of mPer1 and mPer3 proteins results in their rapid degradation, which is dependent on the ubiquitin-proteasome pathway. Moreover, CKI{varepsilon} and CKI{delta} are able to induce nuclear translocation of mPer3, which requires its nuclear localization signal. The mutation in potential phosphorylation sites on mPer3 decreased the extent of both nuclear translocation and degradation of mPer3 that are stimulated by CKI{varepsilon}. CKI{varepsilon} and CKI{delta} affected the inhibitory effect of mPer proteins on the transcriptional activity of BMAL1-CLOCK, but the inhibitory effect of mCry proteins on the activity of BMAL1-CLOCK was unaffected. These results suggest that CKI{varepsilon} and CKI{delta} regulate the mammalian circadian autoregulatory loop by controlling both protein turnover and subcellular localization of mPer proteins.


* Corresponding author. Mailing address: Department of Cell and Developmental Biology, Graduate School of Biostudies, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan. Phone: 81-75-753-4230. Fax: 81-75-753-4235. E-mail: L50174{at}sakura.kudpc.kyoto-u.ac.jp.


Molecular and Cellular Biology, March 2002, p. 1693-1703, Vol. 22, No. 6
0022-538X/02/$04.00+0     DOI: 10.1128/MCB.22.6.1693-1703.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.




This article has been cited by other articles:




Home Help [Feedback] [For Subscribers] [Archive] [Search] [Contents]
J. Bacteriol. J. Virol. Eukaryot. Cell
Microbiol. Mol. Biol. Rev. Clin. Vaccine Immunol. All ASM Journals

Copyright © 2002 by the American Society for Microbiology. All rights reserved.