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THE PLANT CELL, Vol 6, Issue 5 645-657, Copyright © 1994 by American Society of Plant Biologists
Soybean GH3 Promoter Contains Multiple Auxin-Inducible Elements
Z. B. Liu, T. Ulmasov, X. Shi, G. Hagen and T. J. Guilfoyle
Department of Biochemistry, 117 Schweitzer Hall, University of Missouri, Columbia, Missouri 65211
The soybean GH3 gene is transcriptionally induced in a wide variety of
tissues and organs within minutes after auxin application. To determine the
sequence elements that confer auxin inducibility to the GH3 promoter, we
used gel mobility shift assays, methylation interference, deletion
analysis, linker scanning, site-directed mutagenesis, and gain-of-function
analysis with a minimal cauliflower mosaic virus 35S promoter. We
identified at least three sequence elements within the GH3 promoter that
are auxin inducible and can function independently of one another. Two of
these elements are found in a 76-bp fragment, and these consist of two
independent 25- and 32-bp auxin-inducible elements. Both of these 25- and
32-bp auxin-inducible elements contain the sequence TGTCTC just upstream of
an AATAAG. An additional auxin-inducible element was found upstream of the
76-bp auxin-inducible fragment; this can function independently of the
76-bp fragment. Two TGA-box or Hex-like elements (TGACGTAA and TGACGTGGC)
in the promoter, which are strong binding sites for proteins in plant
nuclear extracts, may also elevate the level of auxin inducibility of the
GH3 promoter. The multiple auxin-inducible elements within the GH3 promoter
contribute incrementally to the overall level of auxin induction observed
with this promoter.
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