Interaction of the bacteriophage P22 Arc repressor with operator DNA.
Interaction of the bacteriophage P22 Arc repressor with operator DNA.
复制标题
噬菌体 P22 Arc 抑制子与操纵基因 DNA 的相互作用。
DOI:
10.1016/0022-2836(87)90653-x
复制
发表时间:
1987
影响因子:
5.6
通讯作者:
Sauer,RT
中科院分区:
文献类型:
--
作者:
Vershon,AK;Liao,SM;McClure,WR;Sauer,RT
Arc represser binds to a single, partially symmetric, 21 base-pair operator site that is centered between the− 10 and− 35 regions of the P ant promoter. Protection and interference experiments show that Arc makes contacts with the operator on one side of the DNA helix. Although Arc is a small protein (53 residues/subunit), it makes contacts that are farther from the center of the operator than those made by many larger repressors. These extended contacts include the phosphate groups at the ends of the 21 base-pair site. Under standard conditions (pH 7.5, 100 m m-KCl, 3 m m-MgCl 2, 22° C) half-maximal operator binding is observed at an Arc concentration of 2.5× 10− 9 m and the protein—DNA complex is very stable (t 1 2≈ 80 min).