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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

DNA binding specificity of the wheat bZIP protein EmBP-1.

EmBP-1 is a wheat DNA binding protein of the basic leucine zipper (bZIP) class of transcription factors implicated in the mechanisms of abscisic acid mediated gene activation. Understanding the role of EmBP-1 in regulating gene transcription requires elucidation of its DNA binding specificity. The binding of EmBP-1 was studied using gel shift selection of DNA from random sequence pools. DNA binding sites were identified by sequencing of a selected pool and by cloning and sequencing individual sites. The binding sites were compared by mobility shift assay and DNase I footprinting, which show that EmBP-1 binds to a family of sequences with varying degrees of affinity. The highest affinity site bound by EmBP-1 is the palindrome GCCACGTGGC. EmBP-1 also binds several other sequences with high affinity, however most of these are asymmetric. While nearly all sequences bound by EmBP-1 contain an ACGT core sequence, EmBP-1 can also bind at least two sites with altered cores. These results provide a basis for comparing the DNA binding specificity of EmBP-1 with those of other plant bZIP proteins and provide insight into the possible target sites which EmBP-1 might bind in vivo.[1]


  1. DNA binding specificity of the wheat bZIP protein EmBP-1. Niu, X., Guiltinan, M.J. Nucleic Acids Res. (1994) [Pubmed]
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