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THE PLANT CELL, Vol 7, Issue 12 2039-2051, Copyright © 1995 by American Society of Plant Biologists
Multiple DNA-Protein Complexes at a Circadian-Regulated Promoter Element
I. A. Carre and S. A. Kay
National Science Foundation Center for Biological Timing, University of Virginia, Charlottesville, Virginia, 22903
Higher plant CAB genes encode chlorophyll a/b binding proteins that are
part of light-harvesting complexes in chloroplasts. Transcription of the
Arabidopsis CAB2 (lhcb1*1) gene is under the control of a circadian
oscillator and exhibits high amplitude diurnal oscillations that persist
within a period close to 24 hr in the absence of environmental time cues.
Initial deletion studies in transgenic tobacco have demonstrated that the
region between -111 and -38 of the CAB2 promoter sequence confers circadian
regulation to a luciferase (luc) reporter gene. We dissected this element
further and characterized five DNA binding complexes from Arabidopsis
whole-cell extracts that bind within this region of the promoter and may be
components of the signal transduction pathway for the control of
transcription by the circadian clock. The in vivo analysis of cab2::luc
fusion constructs in transgenic Arabidopsis demonstrated that a
circadian-regulated element lies within a 36-bp sequence that overlaps a
conserved CCAAT box and contains binding sites for three putative
transcription factors.
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