First published online September 20, 2002; 10.1104/pp.003566
Plant Physiol, October 2002, Vol. 130, pp. 688-697
Arabidopsis ABI5 Subfamily Members Have Distinct DNA-Binding and
Transcriptional Activities1
Soo Young
Kim,2
Jianzhong
Ma,3
Philippe
Perret,
Zhongsen
Li,4 and
Terry L.
Thomas*
Department of Biology, Texas A&M University, College
Station, Texas 77843-3258
A small family of novel basic leucine zipper proteins that
includes abscisic acid (ABA)-INSENSITIVE 5 (ABI5) binds to the promoter
region of the lea class gene Dc3.
The factors, referred to as AtDPBFs (Arabidopsis Dc3
promoter-binding factors), were isolated from an immature seed cDNA
library. AtDPBFs bind to the embryo specification and ABA-responsive
elements in the Dc3 promoter and are unique in that they
can interact with cis-elements that do not contain the ACGT core
sequence required for the binding of most other plant basic leucine
zipper proteins. Analysis of full-length cDNAs showed that at least
five different Dc3 promoter-binding factors are present
in Arabidopsis seeds; one of these, AtDPBF-1, is identical to ABI5. As
expected, AtDPBF-1/ABI5 mRNA is inducible by exogenous
ABA in seedlings. Despite the near identity in their basic domains,
AtDPBFs are distinct in their DNA-binding, dimerization, and
transcriptional activity.
1
This work was supported by the U.S. Department
of Agriculture National Research Initiative (grant nos. 94-37304-1228
and 97-35304-4552) and by RhoBio, a joint venture between Aventis
Crop Science and Biogemma.
2
Present address: Kumho Life and Environmental Science
Laboratory, 572 Ssang-Am-Dong, Kwang-San-Gu, Kwangju 506-712, Korea.
3
Present address: Department of Biochemistry,
University of Montreal, CP 6128, Succursale Centre-ville, Montreal,
Quebec, Canada H3C 3J7.
4
Present address: DuPont Agricultural Products,
Experimental Station E402-2227, Wilmington, DE 19880-0402.
*
Corresponding author; e-mail tlthomas{at}tamu.edu; fax
979- 847-8805.
© 2002 American Society of Plant Physiologists
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