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A basic leucine zipper transcription factor, G-box-binding factor 1, regulates blue light-mediated photomorphogenic growth in Arabidopsis

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Title A basic leucine zipper transcription factor, G-box-binding factor 1, regulates blue light-mediated photomorphogenic growth in Arabidopsis
 
Creator Mallappa, Chandrashekara
Yadav, Vandana
Negi, Prem
Chattopadhyay, Sudip
 
Subject G-box-binding Factor 1
Photomorphogenic Growth
Arabidopsis
Leucine Zipper Transcription Factor
 
Description Several transcriptional regulators have been identified and
demonstrated to play either positive or negative regulatory roles
in seedling development. However, the regulatory coordination
between hypocotyl elongation and cotyledon expansion during
early seedling development in plants remains unknown. We
report the identification of a Z-box binding factor (ZBF2) and its
functional characterization in cryptochrome-mediated blue
light signaling. ZBF2 encodes a G-box binding factor (GBF1),
which is a basic leucine zipper transcription factor. Our DNA-
protein interaction studies reveal that ZBF2/GBF1 also interacts
with the Z-box light-responsive element of light-regulated promoters. Genetic analyses of gbf1 mutants and overexpression
studies suggest that GBF1 acts as a repressor of blue light-mediated inhibition in hypocotyl elongation, however, it acts as a
positive regulator of cotyledon expansion during photomorphogenic growth. Furthermore, whereas GBF1 acts as a positive regulator of lateral root formation, it differentially regulates the
expression of light-inducible genes. Taken together, these
results demonstrate that GBF1 is a unique transcriptional regulator of photomorphogenesis in blue light.
This work was supported by a grant from Department of Science and Technology, the Government of India, and an internal grant from National Centre for Plant Genome Research (to S. C.)
 
Date 2013-11-04T11:32:49Z
2013-11-04T11:32:49Z
2006
April 2006
 
Type Article
 
Identifier J. Biol. Chem., 281(31): 22190-22199
http://hdl.handle.net/123456789/55
 
Language en
 
Publisher The American Society for Biochemistry and Molecular Biology, Inc.