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- W2138899029 endingPage "2021" @default.
- W2138899029 startingPage "2009" @default.
- W2138899029 abstract "Protein hydrolysis plays an important role during seed germination and post-germination seedling establishment. In Arabidopsis thaliana, cathepsin B-like proteases are encoded by a gene family of three members, but only the AtCathB3 gene is highly induced upon seed germination and at the early post-germination stage. Seeds of a homozygous T-DNA insertion mutant in the AtCathB3 gene have, besides a reduced cathepsin B activity, a slower germination than the wild type. To explore the transcriptional regulation of this gene, we used a combined phylogenetic shadowing approach together with a yeast one-hybrid screening of an arrayed library of approximately 1200 transcription factor open reading frames from Arabidopsis thaliana. We identified a conserved CathB3-element in the promoters of orthologous CathB3 genes within the Brassicaceae species analysed, and, as its DNA-interacting protein, the G-Box Binding Factor1 (GBF1). Transient overexpression of GBF1 together with a PAtCathB3::uidA (β-glucuronidase) construct in tobacco plants revealed a negative effect of GBF1 on expression driven by the AtCathB3 promoter. In stable P35S::GBF1 lines, not only was the expression of the AtCathB3 gene drastically reduced, but a significant slower germination was also observed. In the homozygous knockout mutant for the GBF1 gene, the opposite effect was found. These data indicate that GBF1 is a transcriptional repressor of the AtCathB3 gene and affects the germination kinetics of Arabidopsis thaliana seeds. As AtCathB3 is also expressed during post-germination in the cotyledons, a role for the AtCathB3-like protease in reserve mobilization is also inferred." @default.
- W2138899029 created "2016-06-24" @default.
- W2138899029 creator A5016327390 @default.
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- W2138899029 creator A5025768431 @default.
- W2138899029 creator A5030770140 @default.
- W2138899029 creator A5055781220 @default.
- W2138899029 date "2014-03-05" @default.
- W2138899029 modified "2023-10-02" @default.
- W2138899029 title "The AtCathB3 gene, encoding a cathepsin B-like protease, is expressed during germination of Arabidopsis thaliana and transcriptionally repressed by the basic leucine zipper protein GBF1" @default.
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- W2138899029 doi "https://doi.org/10.1093/jxb/eru055" @default.
- W2138899029 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/3991739" @default.
- W2138899029 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/24600022" @default.
- W2138899029 hasPublicationYear "2014" @default.
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