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The ccd toxin–antitoxin system of the F plasmid encodes CcdB, a protein that poisons the essential Escherichia coli DNA gyrase, unique type IIA topoisomerase able to introduce negative supercoils into DNA. Based on CcdB structure, a series of linear peptide analogues were obtained by the solid-phase methodology. One of these peptides (CcdBET2) displayed inhibition of the supercoiling activity of bacterial...
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