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Originally published in Science Express on 13 September 2007
Science 12 October 2007:
Vol. 318. no. 5848, pp. 261 - 265
DOI: 10.1126/science.1146994
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Reports

FKF1 and GIGANTEA Complex Formation Is Required for Day-Length Measurement in Arabidopsis

Mariko Sawa, Dmitri A. Nusinow, Steve A. Kay, Takato Imaizumi*

Precise timing of CONSTANS (CO) gene expression is necessary for day-length discrimination for photoperiodic flowering. The FLAVIN-BINDING, KELCH REPEAT, F-BOX 1 (FKF1), and GIGANTEA (GI) proteins regulate CO transcription in Arabidopsis. We demonstrate that FKF1 and GI proteins form a complex in a blue-light–dependent manner. The timing of this interaction regulates the timing of daytime CO expression. FKF1 function is dependent on GI, which interacts with a CO repressor, CYCLING DOF FACTOR 1 (CDF1), and controls CDF1 stability. GI, FKF1, and CDF1 proteins associate with CO chromatin. Thus, the FKF1-GI complex forms on the CO promoter in late afternoon to regulate CO expression, providing a mechanistic view of how the coincidence of light with circadian timing regulates photoperiodic flowering.

Department of Biochemistry, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, CA 92037, USA.

Present address: Division of Biological Sciences, University of California, San Diego, 9800 Gilman Drive #0130, La Jolla, CA 92093–0116, USA.

* To whom correspondence should be addressed. E-mail: timaizumi{at}ucsd.edu

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