Part:BBa_K1632003

fim switch[default OFF](Tokyo_Tech/J23119)_rbs_gfp

Fig. 1. fim switch(Tokyo_Tech/J23119) design (Up:[ON] state Down:[OFF] state)

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 (BBa_J23119). Also between the promoter and the inverting site, there are two restriction enzyme cut sites are added in each side of the promoter (Fig. 1.). So the promoter can easily be interchanged. For example, BBa_K1632005, we replaced J23119 promoter with Lac promoter(BBa_R0010)(Fig. 2.). Except for insertion of restriction enzyme sites, basically, the design of fim switch(Tokyo_Tech) is similar with fim switch(wild-type).

Fig. 2. Fim switch(Tokyo_Tech/R0010) design

From our results of our assay, the inversion of fim switch(Tokyo_Tech/J23119) by FimB(wild-type) (BBa_K1632010)/FimE(wild-type) (BBa_K1632011) was not confirmed correctly. The FimB protein(wild-type) inverts fim switch from [ON] state to [OFF] state and from [OFF] state to [ON] state correctly(Fig. 3.). However the FimE protein(wild-type) didn't invert fim switch predominantly from [ON] state to [OFF] state. In the assay, the FimE protein(wild-type) inverts fim switch from [ON] state to [OFF] state and from [OFF] state to [ON] state(Fig. 4.). In other words, the FimE protein works as the FimB protein.

Fig. 3. The histograms of the samples with FimB measured by flow cytometer

Fig. 4. The histograms of the samples with FimE measured by flow cytometer

More information

For more information, see http://2015.igem.org/Team:Tokyo_Tech/Project Our work in Tokyo_Tech 2015 wiki, http://2015.igem.org/Team:Tokyo_Tech/Experiment/ssrA_tag_degradation_assay About ssrA-tag, http://2015.igem.org/Team:Tokyo_Tech/Experiment/Overview_of_fim_inversion_system About ''fim'' inversion system

Sequence and Features

Assembly Compatibility:

• 10
  COMPATIBLE WITH RFC[10]
• 12
  INCOMPATIBLE WITH RFC[12]

  Illegal NheI site found at 98
  Illegal NheI site found at 121
  
• 21
  INCOMPATIBLE WITH RFC[21]

  Illegal BglII site found at 92
  Illegal BamHI site found at 133
  
• 23
  COMPATIBLE WITH RFC[23]
• 25
  COMPATIBLE WITH RFC[25]
• 1000
  INCOMPATIBLE WITH RFC[1000]

  Illegal BsaI.rc site found at 1102