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Plant and Cell Physiology Advance Access published online on September 21, 2007
Plant and Cell Physiology, doi:10.1093/pcp/pcm122
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© The Author 2007. Published by Oxford University Press on behalf of Japanese Society of Plant Physiologists. All rights reserved. For Permissions, please e-mail: journals.permissions@oxfordjournals.org

Rhythmic and Light-Inducible Appearance of Clock-Associated Pseudo-Response Regulator Protein PRR9 Through Programmed Degradation in the Dark in Arabidopsis thaliana

Shogo Ito1, Norihito Nakamichi, Takatoshi Kiba, Takafumi Yamashino and Takeshi Mizuno

Laboratory of Molecular Microbiology, School of Agriculture, Nagoya University, Chikusa-ku, Nagoya 464-8601, Japan

1Corresponding author: Shogo Ito. E-mail: i052001d{at}mbox.nagoya-u.ac.jp, Fax: +81-52-789-4091


  Abstract

In Arabidopsis thaliana, it is currently believed that the members of a small family of PSUEDO-RESPONSE REGULATOR (PRR) proteins, including TOC1 (TIMING OF CAB EXPRESSION 1), coordinately play roles close to the circadian clock. Among these PRR members, the PRR9 gene is unique in that its transcription not only oscillates diurnally, but also is rapidly induced by light in a manner dependent on phytochromes. These events at the level of transcription must be crucial for the clock-associated functions of PRR9. Nonetheless, little is known about the expression of the PRR9 protein product itself in plant cells. Here, we show that PRR9 polypeptides themselves oscillate diurnally, and that they accumulate rapidly in response to light. Our work further suggests that the presence of PRR9 polypeptides is controlled through proteasome-mediated programmed degradation in the dark.

Keywords: Arabidopsis thaliana - Circadian rhythm - Clock component - Pseudo-response regulator - Proteasome


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