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Soybean GH3 promoter contains multiple auxin-inducible elements
The Plant Cell
|May 1, 1994
Summary
Researchers identified multiple auxin-inducible elements in the soybean GH3 gene promoter. These elements independently confer auxin inducibility, contributing to the gene
Area of Science:
- Plant Molecular Biology
- Gene Regulation
- Plant Hormone Signaling
Background:
- The soybean GH3 gene is rapidly induced by auxin across various plant tissues.
- Understanding the cis-regulatory elements responsible for GH3 auxin inducibility is crucial for deciphering plant hormone responses.
Purpose of the Study:
- To identify and characterize the specific DNA sequence elements within the GH3 promoter that mediate auxin-inducible transcription.
- To elucidate how these elements function, individually and collectively, in response to auxin.
Main Methods:
- Gel mobility shift assays
- Methylation interference assays
- Promoter deletion analysis
- Linker scanning mutagenesis
- Site-directed mutagenesis
- Gain-of-function analysis using a minimal cauliflower mosaic virus 35S promoter
Main Results:
- Identification of at least three independent auxin-inducible sequence elements within the GH3 promoter.
- Characterization of two specific auxin-inducible elements (25-bp and 32-bp) within a 76-bp fragment, both containing the TGTCTC motif upstream of AATAAG.
- Discovery of an additional independent auxin-inducible element located upstream of the 76-bp fragment.
- Observation that TGA-box/Hex-like elements may enhance auxin inducibility by serving as protein binding sites.
Conclusions:
- The GH3 promoter contains multiple, independently functioning auxin-inducible elements that contribute additively to the overall auxin response.
- These findings provide a detailed molecular understanding of GH3 gene regulation by auxin.