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. 1993 Nov;5(11):1681–1692. doi: 10.1105/tpc.5.11.1681

Gibberellin treatment stimulates nuclear factor binding to the gibberellin response complex in a barley alpha-amylase promoter.

T D Sutliff 1, M B Lanahan 1, T H Ho 1
PMCID: PMC160396  PMID: 8312745

Abstract

The promoters of a majority of cereal alpha-amylase genes contain three highly conserved sequences (gibberellin response element, box I, and pyrimidine box). Recent studies have demonstrated the functional importance of four regions that either coincide with or are immediately proximal to these three conserved elements as well as an upstream Opaque-2 binding sequence. In this study, we describe the characterization of nuclear protein factors from barley aleurone layers whose binding activity toward gibberellin response complex sequences from the barley low-pl alpha-amylase gene (Amy32b) promoter is stimulated by gibberellin A3 (GA3) treatment. Barley proteins isolated from crude nuclear extracts prepared from aleurone layers incubated with or without GA3 were fractionated by anion exchange fast protein liquid chromatography and studied using band shift assays, sequence-specific competitions, and DNase I footprinting. A GA3-dependent binding activity eluting at 210 mM KCl was shown to bind specifically to the gibberellin response element and the closely associated box I. DNase I footprinting with the proteins in this fraction indicated interactions with sequences in the gibberellin response element and box I. A second DNA binding activity eluting at 310 mM KCl was present constitutively in extracts prepared from tissues incubated both in the absence and in the presence of hormone. Proteins in this fraction were able to bind to many DNA sequences and, in general, were largely nonspecific. DNase I footprinting with the proteins in this fraction indicated a large area of protection with a single unoccupied region located at the 3' end of box I. The possible function of such an activity in hormone regulation of the alpha-amylase genes is discussed.

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Selected References

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