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Science 5 May 2000:
Vol. 288. no. 5467, pp. 859 - 863
DOI: 10.1126/science.288.5467.859
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Reports

Direct Targeting of Light Signals to a Promoter Element-Bound Transcription Factor

Jaime F. Martínez-García, Enamul Huq, Peter H. Quail *

Light signals perceived by the phytochrome family of sensory photoreceptors are transduced to photoresponsive genes by an unknown mechanism. Here, we show that the basic helix-loop-helix transcription factor PIF3 binds specifically to a G-box DNA-sequence motif present in various light-regulated gene promoters, and that phytochrome B binds reversibly to G-box-bound PIF3 specifically upon light-triggered conversion of the photoreceptor to its biologically active conformer. We suggest that the phytochromes may function as integral light-switchable components of transcriptional regulator complexes, permitting continuous and immediate sensing of changes in this environmental signal directly at target gene promoters.

Department of Plant and Microbial Biology, University of California, Berkeley, CA 94720, and U.S. Department of Agriculture-Agricultural Research Service Plant Gene Expression Center, 800 Buchanan Street, Albany, CA 94710, USA.
*   To whom correspondence should be addressed. E-mail: quail{at}nature.berkeley.edu

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shygrl1 Is a Mutant Affected in Multiple Aspects of Photomorphogenesis.
M. Santiago-Ong, R. M. Green, S. Tingay, J. A. Brusslan, and E. M. Tobin (2001)
Plant Physiology 126, 587-600
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A Tale of Two Pigments.
A. W. Galston (2001)
Plant Physiology 126, 32-34
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EID1, an F-box protein involved in phytochrome A-specific light signaling.
M. Dieterle, Y.-C. Zhou, E. Schäfer, M. Funk, and T. Kretsch (2001)
Genes & Dev. 15, 939-944
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Science. ISSN 0036-8075 (print), 1095-9203 (online)