Abstract
A 33 bp double-stranded oligonucleotide homologous to two AT-rich sequences located upstream (−907 to −889 and −843 to −826) to the start of transcription of heat shock gene Gmhsp17.5E of soybean stimulated transcription when placed 5′ to a truncated (−140) maize Adh1 promoter. The chimeric promoter was assayed in vivo utilizing anaerobically stressed sunflower tumors transformed by a pTi-based vector of Agrobacterium tumefaciens.
Nuclear proteins extracted from soybean plumules were shown to bind double-stranded oligonucleotides homologous to AT-rich sequences in the 5′ flanking regions of soybean β-conglycinin, lectin, leghemoglobin and heat shock genes. These proteins were also shown to bind AT-rich probes homologous to homeobox protein binding sites from the Antennapedia and engrailed/fushi tarazu genes of Drosophila. Binding activity specific for AT-rich sequences showed a wide distribution among various plant organs and species. Preliminary characterization indicated that two sets of nuclear proteins from soybean bind AT-rich DNA sequences: a diverse high-molecular-weight (ca. 46–69 kDa) group, and a low-molecular-weight (23 and 32 kDa) group of proteins. The latter meets the operational criteria for high-mobility group proteins (HMGs).
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Czarnecka, E., Ingersoll, J.C. & Gurley, W.B. AT-rich promoter elements of soybean heat shock gene Gmhsp 17.5E bind two distinct sets of nuclear proteins in vitro . Plant Mol Biol 19, 985–1000 (1992). https://doi.org/10.1007/BF00040530
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DOI: https://doi.org/10.1007/BF00040530