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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Tobin, E. M. Green, R. M. Andronis, C. Sugano, S. Wang, Z. Y. |
| Description | Author Affiliation: Sugano S ( Department of Molecular, Cell and Developmental Biology, University of California, Los Angeles, CA 90095-1606, USA.); |
| Abstract | The circadian clock-associated 1 (CCA1) gene encodes a Myb-related transcription factor that has been shown to be involved in the phytochrome regulation of Lhcb1*3 gene expression and in the function of the circadian oscillator in Arabidopsis thaliana. By using a yeast interaction screen to identify proteins that interact with CCA1, we have isolated a cDNA clone encoding a regulatory (beta) subunit of the protein kinase CK2 and have designated it as CKB3. CKB3 is the only reported example of a third beta-subunit of CK2 found in any organism. CKB3 interacts specifically with CCA1 both in a yeast two-hybrid system and in an in vitro interaction assay. Other subunits of CK2 also show an interaction with CCA1 in vitro. CK2 beta-subunits stimulate binding of CCA1 to the CCA1 binding site on the Lhcb1*3 gene promoter, and recombinant CK2 is able to phosphorylate CCA1 in vitro. Furthermore, Arabidopsis plant extracts contain a CK2-like activity that affects the formation of a DNA-protein complex containing CCA1. These results suggest that CK2 can modulate CCA1 activity both by direct interaction and by phosphorylation of the CCA1 protein and that CK2 may play a role in the function of CCA1 in vivo. |
| ISSN | 00278424 |
| e-ISSN | 10916490 |
| Journal | Proceedings of the National Academy of Sciences of the United States of America |
| Issue Number | 18 |
| Volume Number | 95 |
| Language | English |
| Publisher | National Academy of Sciences |
| Publisher Date | 1998-09-01 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Arabidopsis Proteins Arabidopsis Metabolism Circadian Rhythm Protein-Serine-Threonine Kinases Transcription Factors Amino Acid Sequence Genetics Casein Kinase II DNA, Complementary DNA, Recombinant DNA-Binding Proteins Molecular Sequence Data Phosphorylation Promoter Regions, Genetic Protein Binding Recombinant Proteins Sequence Homology, Amino Acid Chemistry Research Support, U.S. Gov't, P.H.S. Multidisciplinary |
| Content Type | Text |
| Resource Type | Article |
| Subject | Multidisciplinary |
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