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Published on January 12, 2007; 10.1104/pp.106.094185

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Received December 5, 2006
Accepted January 1, 2007

Glutathione S-Transferase Interacting with FIN219 Is Involved in Phytochrome A-Mediated Signaling in Arabidopsis

Ing-Chien Chen , I-Ching Huang , Ming-Jung Liu , Zhi-Gong Wang , Shu-Shiang Chung , and Hsu-Liang Hsieh *

Institute of Plant Biology, College of Life Science, National Taiwan University, Taipei 106, Taiwan

* Corresponding author; email: hlhsieh{at}ntu.edu.tw.

Far-red insensitive 219 (FIN219) was previously shown to be involved in phytochrome A-mediated far-red light signaling. To further understand its function and regulatory relation with other light signaling components, a yeast two-hybrid approach was used to isolate FIN219-interacting partners. Here, we demonstrate that a FIN219-interacting protein 1 (FIP1) interacts with FIN219 in vitro and in vivo and is composed of 217 amino acids that belong to the tau class of the large glutathione S-transferase (GST) gene family. FIP1 was further shown to have GST activities. The gain-of-function and partial loss-of-function of FIP1 resulted in a hyposensitive hypocotyl phenotype under continuous far-red light (cFR) and a delayed flowering phenotype under long-day conditions, which suggests that FIP1 may exist in a complex to function in the regulation of Arabidopsis (Arabidopsis thaliana) development. As well, FIP1 mRNA was down-regulated in the spa1 mutant and differentially expressed in cop1-4 and cop1-5 mutants under cFR. Intriguingly, FIP1 expression was up-regulated in the fin219 mutant under all light conditions except cFR. Furthermore, promoter activity assays revealed that FIP1 expression was light dependent, mainly associated with vascular tissues, and developmentally regulated. Subcellular localization studies revealed that the GUS-FIP1 fusion protein was localized in the nucleus and cytoplasm. Taken together, these data indicate that FIP1 may interact with FIN219 to regulate cell elongation and flowering in response to light.




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