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Plant Cell, Vol. 10, 673-684, May 1998, Copyright © 1998, American Society of Plant Physiologists
Arabidopsis bZIP Protein HY5 Directly Interacts with Light-Responsive Promoters in Mediating Light Control of Gene Expression
Sudip Chattopadhyaya,
Lay-Hong Anga,
Pilar Puentea,
Xing-Wang Denga, and
Ning Weia
a Department of Molecular, Cellular, and Developmental Biology, Yale University, New Haven, Connecticut 06520
Correspondence to:
Ning Wei, , New Haven, CT 06520. , nwei{at}peaplant.biology.yale.edu (E-mail), 203-432-3854 (fax).
The Arabidopsis HY5 gene has been defined genetically as a positive regulator of photomorphogenesis and recently has been shown to encode a basic leucine zipper type of transcription factor. Here, we report that HY5 is constitutively nuclear localized and is involved in light regulation of transcriptional activity of the promoters containing the G-box, a well-characterized light-responsive element (LRE). In vitro DNA binding studies suggested that HY5 can bind specifically to the G-box DNA sequences but not to any of the other LREs present in the light-responsive promoters examined. High-irradiance light activation of two synthetic promoters containing either the consensus G-box alone or the G-box combined with the GATA motif (another LRE) and the native Arabidopsis ribulose bisphosphate carboxylase small subunit gene RBCS-1A promoter, which has an essential copy of the G-box, was significantly compromised in the hy5 mutant. The hy5 mutation's effect on the high-irradiance light activation of gene expression was observed in both photosynthetic and nonphotosynthetic tissues. Furthermore, the characteristic phytochrome-mediated red light– and far-red light–reversible low-fluence induction of the G-box–containing promoters was diminished specifically in hy5 plants. These results suggest that HY5 may interact directly with the G-box in the promoters of light-inducible genes to mediate light-controlled transcriptional activity.
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