Part:BBa_K1632000
fim switch[deault ON](Tokyo_Tech/J23119)
The fim switch is the promoter containing repeated DNA sequence which is inverted by the Fim recombinase. Therefore, we can control the expression of the gene downstream of the fim switch by adding the Fim recombinase.
We designed this fim switch which has a J23119 promoter. Also between the promoter and the inverting site, there are two restriction enzyme sites in each front (SalIand BamHI) and back (BglII and MluI)(Fig. 1. Tokyo Tech fim switch (Tokyo_Tech/J23119) design). So the promoter can easily be interchanged. Except for insertion of restriction enzyme sites, basically, the design of TokyoTech fim switch is similar with Wild Type fim switch.
The inversion of fim switch (Tokyo_Tech/J23119) by FimB/FimE was not confirmed correctly. From the assay, the FimB protein inverts fim switch in the ON-to-OFF and the OFF-to-ON direction correctly. However the FimE protein didn’t inverts fim switch predominantly in the ON-to-OFF direction. In the assay, the FimE protein inverts fim switch in the ON-to-OFF and the OFF-to-ON direction. In other words, the FimE protein works as the FimB protein.
Sequence and Features
- 10COMPATIBLE WITH RFC[10]
- 12INCOMPATIBLE WITH RFC[12]Illegal NheI site found at 345
Illegal NheI site found at 368 - 21INCOMPATIBLE WITH RFC[21]Illegal BglII site found at 374
Illegal BamHI site found at 333 - 23COMPATIBLE WITH RFC[23]
- 25COMPATIBLE WITH RFC[25]
- 1000COMPATIBLE WITH RFC[1000]
//function/recombination/fim
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