共查询到20条相似文献,搜索用时 662 毫秒
1.
Molecular analysis of the TyrR protein-mediated activation of mtr gene expression in Escherichia coli K-12. 总被引:5,自引:5,他引:0
下载免费PDF全文
![点击此处可从《Journal of bacteriology》网站下载免费的PDF全文](/ch/ext_images/free.gif)
Expression of the mtr gene, which encodes a tryptophan-specific transport system in Escherichia coli K-12, is activated by the TyrR protein. Two TyrR protein binding sites (TYR R boxes) are positioned upstream of the -35 promoter region. Mutational and DNase protection studies indicate that TyrR protein binds preferentially to the TYR R box closest to the promoter, and this is essential for activation of gene expression. In the presence of tyrosine and ATP, a second TyrR molecule is able to cooperatively bind to the second box and cause a further increase in the level of activation. 相似文献
2.
TyrR protein of Escherichia coli and its role as repressor and activator 总被引:25,自引:7,他引:18
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
14.
15.
16.
17.
18.
19.