PMID: 7987408Oct 1, 1994Paper

Circadian clock- and phytochrome-regulated transcription is conferred by a 78 bp cis-acting domain of the Arabidopsis CAB2 promoter

The Plant Journal : for Cell and Molecular Biology
S L AndersonS. A. Kay

Abstract

The Arabidopsis CAB2 promoter was used to define the terminal genomic targets that are subject to regulation by the circadian clock. An in vivo cab::luciferase bioluminescent marker was used to enable the assaying of the expression of chimeric constructs with unprecedented sensitivity and time resolution in living seedlings. Dissection of -322 to +1 of the CAB2 promoter has revealed several interesting features: it was demonstrated that the 323 bp fragment contains at least one strong general positive element. The positive element contains an ACGT core sequence specifically bound by a protein activity, termed CUF-1, and contributes to high level expression but is not required for phytochrome- or circadian-regulation. Moreover, a 78 bp domain was defined that confers both circadian- and phytochrome-regulation upon heterologous promoters. Conserved GATA sequences within the 78 bp regulatory domain are specifically bound by a protein factor designated CGF-1. The binding specificity of CGF-1 appears to be related to the GT-family of trihelix DNA-binding proteins. The role of these DNA-protein interactions is discussed in terms of clock- and phytochrome regulation, and their relevance as targets for pathways defined by photomorphoge...Continue Reading

Citations

Nov 1, 1996·BioEssays : News and Reviews in Molecular, Cellular and Developmental Biology·A von Arnim, X W Deng
Dec 1, 1995·Plant Molecular Biology·G R Teakle, S A Kay
Mar 1, 1997·Journal of Plant Research·K Hiratsuka, N H Chua
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Oct 11, 2003·Trends in Genetics : TIG·John C Gray
Jan 1, 1997·Free Radical Biology & Medicine·A N Polidoros, J G Scandalios
Feb 28, 1995·Proceedings of the National Academy of Sciences of the United States of America·S L Anderson, S A Kay
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