Add time:08/16/2019         Source:sciencedirect.com

A plant cDNA has been cloned that encodes a DNA-binding protein displaying a nucleotide (nt) sequence specificity similar to that of the mammalian cyclic AMP response element-binding protein/activating transcription factor (CREB/ATF) family of mammalian proteins. This cDNA was cloned in Escherichia coli from a broad bean (Vicia faba) cDNA expression library using a recognition site probe. The deduced amino acid (aa) sequence of the recombinant cDNA-encoded protein, called VBP1, has a basic region adjacent to a leucine zipper motif, of the type seen in the DNA-binding domains of many eukaryotic DNA-binding proteins, including mammalian CREB/ATF. Although this aa sequence has homology to regions of deduced aa sequences of other cloned plant cDNAs, it is distinct in both the derived primary structure and in its nt sequence specificity. VBP1, as well as proteins in nuclear extracts of V. faba with similar nt sequence specificity, have their binding to DNA supressed more than tenfold by cytosine methylation at the CREB/ATF consensus sequence.

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