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An ACT-like domain participates in the dimerization of several plant basic-helix-loop-helix transcription factors.

J Biol Chem. 2006 Sep 29;281(39):28964-74. Epub 2006 Jul 25
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摘要


The maize basic-helix-loop-helix (bHLH) factor R belongs to a group of proteins with important functions in the regulation of metabolism and development through the cooperation with R2R3-MYB transcription factors. Here we show that in addition to the bHLH and the R2R3-MYB-interacting domains, R contains a dimerization region located C-terminal to the bHLH motif. This protein-protein interaction domain is important for the regulation of anthocyanin pigment biosynthesis by contributing to the recruitment of the C1 R2R3-MYB factor to the C1 binding sites present in the promoters of flavonoid biosynthetic genes. The R dimerization region bares structural similarity to the ACT domain present in several metabolic enzymes. Protein fold recognition analyses resulted in the identification of similar ACT-like domains in several other plant bHLH proteins. We show that at least one of these related motifs is capable of mediating homodimer formation. These findings underscore the function of R as a docking site for multiple protein-protein interactions and provide evidence for the presence of a novel dimerization domain in multiple plant bHLH proteins.

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