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In order to investigate the role of DNA bending on the regulation of σ54-dependent promoters, we introduced the CopG binding site between the enhancer-like element and the core promoter of glnAp2, nifLp and glnHp2, without changing the distance in between. The expression activities of these homologous promoters were either activated or repressed by the CopG-induced DNA bending in E. coli. In this...
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