Direct observation of a 91 bp LacI-mediated, negatively supercoiled DNA loop by atomic force microscope.

Direct observation of a 91 bp LacI-mediated, negatively supercoiled DNA loop by atomic force microscope.
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DOI:
10.1002/1873-3468.12094
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发表时间:
2016-03
期刊:
影响因子:
3.5
通讯作者:
Leng F
Leng F
中科院分区:
生物学3区
文献类型:
--
作者:
Fulcrand G;Chapagain P;Dunlap D;Leng F

文献摘要

相似文献

大肠杆菌乳糖阻遏蛋白(LacI)是一种四聚体蛋白,是一种典型的转录因子,控制乳糖操纵子中lacZYA的表达。它特异性结合乳糖启动子的O1、O2和O3操纵子,形成DNA环,并调节乳糖操纵子的转录。在这篇文章中,利用DNA切口分析和AFM成像相结合的技术,我们直接观察到一个91 bp的LacI介导的,负超螺旋的DNA环模仿的DNA环之间的O1和O3运营商在乳糖启动子。
Escherichia coli lactose repressor (LacI), a tetrameric protein, is a paradigmatic transcriptional factor that controls the expression of lacZYA in the lac operon. It specifically binds to the O1, O2, and O3 operators of the lac promoter, forms DNA loops, and regulates transcription of the lac operon. In this article, utilizing combined techniques of DNA-nicking assay and AFM imaging, we directly observed a 91 bp LacI-mediated, negatively supercoiled DNA loop mimicking the DNA loop between the O1 and O3 operators in the lac promoter.