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THE PLANT CELL, Vol 4, Issue 7 831-838, Copyright © 1992 by American Society of Plant Biologists
A Tobacco DNA Binding Protein That Interacts with a Light-Responsive Box II Element
O. Perisic and E. Lam
AgBiotech Center, Waksman Institute, Rutgers State University, Piscataway, New Jersey 08855
Ribulose-1,5-bisphosphate carboxylase/oxygenase plays a key role in
photosynthetic carbon fixation in higher plants. The small subunit of this
chloroplast enzyme (rbcS), encoded by a family of nuclear genes, is
regulated at the transcriptional level by light. Promoter analyses have
previously identified the box II sequence as a cis element critical for the
light-regulated expression of rbcS genes. Nuclear factor GT-1 binds
specifically to this element and is one of the plant nuclear factors that
has been detected and studied in great detail. Here we describe the cloning
and characterization of a tobacco cDNA encoding a protein, designated B2F
(Box II Factor), with similar binding specificity and mobility in gel
retardation assays as nuclear GT-1. Steady state levels of mRNA encoding
B2F do not appear to be regulated by light; this is consistent with the
previous observation that nuclear GT-1 activity is present in extracts from
both light-grown and dark-adapted plants. Sequence comparison with another
plant trans-acting factor, GT-2, which binds to a GT-like element in the
rice phytochrome promoter, shows striking homology in three putative
[alpha]-helices that may be involved in DNA binding.
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