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THE PLANT CELL, Vol 6, Issue 1 107-118, Copyright © 1994 by American Society of Plant Biologists
A Novel AT-Rich DNA Binding Protein That Combines an HMG I-like DNA Binding Domain with a Putative Transcription Domain
G. Tjaden and G. M. Coruzzi
Department of Biology, New York University, 1009 Main Building; New York, New York 10003
There is growing evidence that AT-rich promoter elements play a role in
transcription of plant genes. For the promoter of the nuclear gene for
chloroplast glutamine synthetase from pea (GS2), the deletion of a 33-bp
AT-rich sequence (box 1 native) from the 5[prime] end of a GS2
promoter-[beta]-glucuronidase (GUS) fusion resulted in a 10-fold reduction
in GUS activity. The box 1 native element was used in gel shift analysis
and two distinct complexes were detected. One complex is related to the
low-mobility complex reported previously for AT-rich elements from several
other plant promoters. A multimer of the box 1 sequence was used to isolate
a cDNA encoding an AT-rich DNA binding protein (ATBP-1). ATBP-1 is not a
high-mobility group protein, but it is a novel protein that combines a
high-mobility group I/Y-like DNA binding domain with a glutamine-rich
putative transcriptional domain.
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