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GBF 1, a transcription factor of blue light signaling in Arabidopsis, is degraded in the dark by a proteasome-mediated pathway independent of COP 1 and SPA 1

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Title GBF 1, a transcription factor of blue light signaling in Arabidopsis, is degraded in the dark by a proteasome-mediated pathway independent of COP 1 and SPA 1
 
Creator Mallappa, Chandrashekara
Singh, Aparna
Ram, Hathi
Chattopadhyay, Sudip
 
Subject Arabidopsis
GBF1
Transcription Factor
Blue Light Signaling
Proteasome-mediated Pathway
COP1
SPA1
 
Description Arabidopsis GBF1/ZBF2 is a bZIP transcription factor that
plays dual but opposite regulatory roles in cryptochrome-mediated blue light signaling. Here, we show the genetic and molecular interrelation of GBF1 with two well characterized negative
regulators of light signaling, COP1 and SPA1, in photomorphogenic growth and light-regulated gene expression. Our results
further reveal that GBF1 protein is less abundant in the dark-
grown seedlings and is degraded by a proteasome-mediated
pathway independent of COP1 and SPA1. Furthermore, COP1
physically interacts with GBF1 and is required for the optimum
accumulation of GBF1 protein in light-grown seedlings. Taken
together, this study provides a mechanistic view of concerted
function of three important regulators in Arabidopsis seedling
development.
This work is supported in part by a Ramanna Fellowship grant from the
Dept. of Science and Technology, Government of India (to S. C.).
 
Date 2013-11-11T05:13:31Z
2013-11-11T05:13:31Z
2008
October 2008
 
Type Article
 
Identifier J. Biol. Chem., 283(51): 35772-35782
http://hdl.handle.net/123456789/94
 
Language en
 
Publisher The American Society for Biochemistry and Molecular Biology, Inc.