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
中科院分区:
文献类型:
--
作者:
Fulcrand G;Chapagain P;Dunlap D;Leng F
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.