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The AtMYB12 activation domain maps to a short C-terminal region of the transcription factor.

Z Naturforsch C J Biosci. 2017 Jul 14;72(7-8):251-257
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摘要


The Arabidopsis thaliana R2R3-MYB transcription factor MYB12 is a light-inducible, flavonol-specific activator of flavonoid biosynthesis. The transactivation activity of the AtMYB12 protein was analyzed using a C-terminal deletion series in a transient A. thaliana protoplast assay with the goal of mapping the activation domain (AD). Although the deletion of the last 46 C-terminal amino acids did not affect the activation capacity, the deletion of the last 98 amino acids almost totally abolished transactivation of two different target promoters. A domain swap experiment using the yeast GAL4 DNA-binding domain revealed that the region from positions 282 to 328 of AtMYB12 was sufficient for transactivation. In contrast to the R2R3-MYB ADs known thus far, that of AtMYB12 is not located at the rearmost C-terminal end of the protein. The AtMYB12 AD is conserved in other experimentally proven R2R3-MYB flavonol regulators from different species.

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