d(GC) n repeats form Z-DNA within promoter region and repress the promoter activity in Escherichia coli

d(GC)n repeats form Z-DNA within promoter region and repress the promoter activity in Escherichia coli Shenghe Huang1, Chuxin Wu2, Dongming Li1, Haizhou Wang3, Zechang Rao1, Qiling Shen1, Chunxiang Chen1, Yong Liu3, Xun Xu1, and Chengyu Hu3,* Fuzhou Medical College, Nanchang University, Fuzhou 344000, China, Nanchang Teachers College, Nanchang 330103, China, and Department of Bioscience, College of Life Science, Nanchang University, Nanchang 330031, China