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      PRR5 (PSEUDO-RESPONSE REGULATOR 5) plays antagonistic roles to CCA1 (CIRCADIAN CLOCK-ASSOCIATED 1) in Arabidopsis thaliana.

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          Abstract

          In general, the clock (or oscillator) is central to circadian rhythms in many organisms. In the model higher plant Arabidopsis thaliana, the best candidates for clock components are CCA1 (CIRCADIAN CLOCK-ASSOCIATED 1) and LHY (LATE ELONGATED HYPOCOTYL), which are homologous Myb-related transcription factors. It is also believed that TOC1 (TIMING OF CAB EXPRESSION 1) is another component of the central oscillator. In this connection, we have been characterizing a small family of proteins, designated ARABIDOPSIS PSEUDO-RESPONSE REGULATOR (PRR1, PRR3, PRR5, PRR7, and PRR9), based on the fact that one of the members (PRR1) is identical to TOC1. Nevertheless, it is not yet certain whether other PRR family members are also implicated in clock function per se. To address this issue, in this study we examined a functional interaction between the CCA1 clock component and one of the PRR family members, PRR5, by employing transgenic lines overexpressing both the CCA1 and PRR5 genes. Evidence will be provided that PRR5 plays an antagonistic role(s) to the putative CCA1 clock component.

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          Author and article information

          Journal
          Biosci. Biotechnol. Biochem.
          Bioscience, biotechnology, and biochemistry
          Japan Society for Bioscience, Biotechnology, and Agrochemistry
          0916-8451
          0916-8451
          Feb 2005
          : 69
          : 2
          Affiliations
          [1 ] Laboratory of Molecular Microbiology, School of Agriculture, Nagoya University, Japan.
          Article
          JST.JSTAGE/bbb/69.426
          10.1271/bbb.69.426
          15725674
          898bf0be-bbf9-4769-ba35-58f8c22dd3b5
          History

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