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• W2045543348 startingPage "775" @default.
• W2045543348 abstract "In higher plants, activation sequence-1 (as-1) of the cauliflower mosaic virus 35S promoter mediates both salicylic acid- and auxin-inducible transcriptional activation. Originally found in viral and T-DNA promoters, as-1-like elements are also functional elements of plant promoters activated in the course of a defence response upon pathogen attack. as-1-like elements are characterised by two imperfect palindromes with the palindromic centres being spaced by 12 bp. They are recognised by plant nuclear as-1-binding factor ASF-1, the major component of which is basic/leucine zipper (bZIP) protein TGA2.2 (approximately 80%) in Nicotiana tabacum. In electrophoretic mobility shift assays, ASF-1 as well as bZIP proteins TGA2.2, TGA2.1 and TGA1a showed a 3-10-fold reduced binding affinity to mutant as-1 elements encoding insertions of 2, 4, 6, 8 or 10 bp between the palindromes, respectively. This correlated with a 5-10-fold reduction in transcriptional activation from these elements in transient expression assays. Although ASF-1 and TGA factors bound efficiently to a mutant element carrying a 2 bp deletion between the palindromes [as-1/(-2)], the latter was strongly compromised with respect to mediating gene expression in vivo. A fusion protein consisting of TGA2.2 and a constitutive activation domain mediated transactivation from as-1/(-2) demonstrating binding of TGA factors in vivo. We therefore conclude that both DNA binding and transactivation require optimal positioning of TGA factors on the as-1 element." @default.
• W2045543348 created "2016-06-24" @default.
• W2045543348 creator A5029654928 @default.
• W2045543348 date "2002-02-01" @default.
• W2045543348 modified "2023-10-10" @default.
• W2045543348 title "Analysis of the spacing between the two palindromes of activation sequence-1 with respect to binding to different TGA factors and transcriptional activation potential" @default.
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• W2045543348 doi "https://doi.org/10.1093/nar/30.3.775" @default.
• W2045543348 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/100291" @default.
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• W2045543348 hasPublicationYear "2002" @default.
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