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By expressing the tetR-HNS fusion proteins, the tetR part of the proteins wound recognize and specifically bind to the 2 tetR binding region (tetO2).Thus in our designed operator- repressor binding, the presence of 2 tetR binding sites are used to enhance the binding of tetR part of the fusion proteins. As the fusion proteins bound to tetO, it is expected that the H-NS part of the fusion protein would attract and oligomerize with other native H-NS proteins inside the cell. With the oligomerization of the fusion proteins and native H-NS, the DNA covered by the oligomers is expected to trap the RNA polymerase during transcription, thus gene (GFP) repression is achieved.
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