Interaction of the bacteriophage P22 Arc repressor with operator DNA.

Interaction of the bacteriophage P22 Arc repressor with operator DNA.
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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
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发表时间:
1987
影响因子:
5.6
通讯作者:
Sauer,RT
Sauer,RT
中科院分区:
生物学2区
文献类型:
--
作者:
Vershon,AK;Liao,SM;McClure,WR;Sauer,RT

文献摘要

被引文献

相似文献

电弧抑制子与单个、部分对称、21 个碱基对的操纵位点结合,该位点位于 P ant 启动子的−10 和−35 区域之间。保护和干扰实验表明,Arc 在 DNA 螺旋的一侧与操作者接触。尽管 Arc 是一种小蛋白质(53 个残基/亚基),但它产生的接触比许多较大阻遏蛋白产生的接触距离操纵子中心更远。这些延伸的接触包括 21 个碱基对位点末端的磷酸基团。在标准条件下(pH 7.5、100 m m-KCl、3 m m-MgCl 2、22° C),在 Arc 浓度为 2.5× 10− 9 m 时观察到半最大操作子结合,并且蛋白质-DNA 复合物非常稳定(t 1 2≈ 80 分钟)。
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).