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pubmed-article:1542572pubmed:abstractTextWe describe a novel uracil interference method for examining protein contacts with the 5-methyl group of thymines. The protein of interest is incubated with target DNA containing randomly distributed deoxyuracil substitutions that is generated by carrying out the polymerase chain reaction in the presence of a mixture of TTP and dUTP. After separating DNA-protein complexes away from unbound DNA, the locations of deoxyuracil residues that either do or do not interfere with DNA-binding are determined by cleavage with uracil-N-glycosylase followed by piperidine. Using this uracil interference assay, we show that the methyl groups of the four core thymines, but not the two peripheral thymines, of the optimal binding site (ATG-ACTCAT) are important for high affinity binding of GCN4. Similar, but not identical, results are obtained using KMnO4 interference, another method used for studying protein-DNA interactions involving thymine residues. These observations strongly suggest that GCN4 directly contacts the 5-methyl groups of the four core thymines that lie in the major groove of the target DNA. Besides providing specific structural information about protein-DNA complexes, uracil interference should also be useful for identifying DNA-binding proteins and their target sites in eukaryotic promoter regions.lld:pubmed
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pubmed-article:1542572pubmed:articleTitleUracil interference, a rapid and general method for defining protein-DNA interactions involving the 5-methyl group of thymines: the GCN4-DNA complex.lld:pubmed
pubmed-article:1542572pubmed:affiliationDepartment of Biological Chemistry and Molecular Pharmacology, Harvard Medical School, Boston, MA 02115.lld:pubmed
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pubmed-article:1542572pubmed:publicationTypeResearch Support, U.S. Gov't, P.H.S.lld:pubmed
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