title: PRR5 (PSEUDO-RESPONSE REGULATOR 5) plays antagonistic roles to CCA1 (CIRCADIAN CLOCK-ASSOCIATED 1) in Arabidopsis thaliana.
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.
authors.affiliation: Laboratory of Molecular Microbiology, School of Agriculture, Nagoya University, Japan.
authors.forename: Toru
authors.initials: T
authors.lastname: Fujimori
authors.forename: Eriko
authors.initials: E
authors.lastname: Sato
authors.forename: Takafumi
authors.initials: T
authors.lastname: Yamashino
authors.forename: Takeshi
authors.initials: T
authors.lastname: Mizuno
mesh_terms: D017360:Arabidopsis / Q000235:genetics* / Q000254:growth & development / Q000502:physiology*; D029681:Arabidopsis Proteins / Q000037:antagonists & inhibitors / Q000502:physiology*; D018507:Gene Expression Regulation, Developmental / Q000502:physiology; D018506:Gene Expression Regulation, Plant / Q000502:physiology*; D018546:Hypocotyl / Q000254:growth & development; D008027:Light; D010641:Phenotype; D030821:Plants, Genetically Modified; D015398:Signal Transduction; D014157:Transcription Factors / Q000037:antagonists & inhibitors / Q000502:physiology*
chemical_list: D029681:Arabidopsis Proteins; C114425:CCA1 protein, Arabidopsis; D014157:Transcription Factors