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CpG methylation inhibits binding of several sequence-specific DNA-binding proteins from pea, wheat, soybean and cauliflower

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Abstract

To elucidate how methylation of specific sites in plant DNA might control transcription, we examined the effect of DNA methylation at CpG sequences on the binding of plant nuclear factors to an oligonucleotide duplex containing the consensus sequence for mammalian CREB (cAMP response element binding protein). CREB is part of the ATF (activating transcription factor) family of mammalian proteins specifically binding to 5′-TGACGTCA-3′ and related sequences. Proteins recognizing the CREB-specific ligand were identified in nuclear extracts of pea seeds wheat germ, cauliflower, and soybean leaves using electrophoretic mobility shift assays. Cytosine methylation inhibited binding of this protein in all these extracts, and so this sequence-specific DNA-binding activity is referred to as methylation-inhibited binding protein 1 (MIB-1). Sites somewhat similar to that of the CREB ligand are found in the upstream regions of a wheat histone H3 gene and tomato and pea ribulose 1,5-bisphosphate carboxylase genes. These sites were bound preferentially by distinct proteins that may be related to the previously described plant proteins HBP-1, HSBF, ASF-1, or GBF. Methylation of cytosine residues at these sites and at a site for MIB-1 located upstream of a soybean proline-rich protein gene also reduced specific binding with all the nuclear extracts tested. Similarly, substitution of the central CpG dinucleotide with TpG decreased binding.

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Authors and Affiliations

  1. Deparment of Biochemistry, Tulane Medical School, 70112, New Orleans, LA, USA

    Nilufar M. Inamdar & Melanie Ehrlich

  2. Southern Regional Research Center, U.S. Department of Agriculture, 70179, New Orleans, LA, USA

    Kenneth C. Ehrlich

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  1. Nilufar M. Inamdar
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  2. Kenneth C. Ehrlich
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Inamdar, N.M., Ehrlich, K.C. & Ehrlich, M. CpG methylation inhibits binding of several sequence-specific DNA-binding proteins from pea, wheat, soybean and cauliflower. Plant Mol Biol 17, 111–123 (1991). https://doi.org/10.1007/BF00036811

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  • DOI: https://doi.org/10.1007/BF00036811

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