Part:BBa_K1933102

constitutive expression of CBDcex fused to BclA with 6xHis tag

CBDcex fused to BclA with 6xHis tag is one of a series of surface expressing fusion proteins that make up biodevice that aims to be the therapeutic solution against norovirus infections. This protein in particular is a cellulose binding protein(CBD) fused to surface expression anchoring domain(BclA), connected by a 6xHis tag to be easily identified by Western blotting. For more information, please visit [http://2016.igem.org/Team:Kyoto our wiki].

Sequence and Features

Assembly Compatibility:

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

  Illegal NheI site found at 7
  Illegal NheI site found at 30
  
• 21
  COMPATIBLE WITH RFC[21]
• 23
  COMPATIBLE WITH RFC[23]
• 25
  COMPATIBLE WITH RFC[25]
• 1000
  COMPATIBLE WITH RFC[1000]

Usage

We succeeded in surface expressing anti-NoV scFv BBa_K1933002 antibody using INPNC. We aimed to orally administrate this protein expressing E. coli, however, we obtained an overwhelmingly negative result from surveys conducted when asked "Would you feel uncomfortable with oral administration of sterilized recombinant organisms?" This is why we also constructed a parts that surface expresses cellulose binding domains (CBD). With this part, we can "leash" E.coli to cellulose and make them swiftly exit human digestive systems. We selected CBDcex as CBD for this part.

Characterization

Sequence confirmed!

Western blotting

We used whole-cell Westernlotting with anti-His tag antibody(Fig.1(a)). Then, we prepared the membrane fraction from the E. coli lysate. Membrane fraction was solubilized and used for Nickel Sepharose purification and precipitates were examined by Western blotting against His tag(Fig.1(b)).

Fig.2: (a) whole cell Western blotting against His tag. (b) membrane fraction Western blotting against His tag.
Negative Control:BBa_K165002, BclA-His-scFv:33 kDa, INPNC-His-scFv:63 kDa, BclA-His-CBDcex:17 kDa, INPNC-His-CBDcex:47 kDa, Positive control(Lpp-OmpA-scFv-His):43 kDa

A band corresponding to BclA-His-CBDcex (17 kDa) was not observed in both whole cell and membrane fraction Western blotting (Fig.1(a),(b)), which indicates that fusion protein was not expressed.

Judging

We fulfilled criteria listed below with this part.

• Part / Contribution (Bronze)
• [http://2016.igem.org/Team:Kyoto/HP/Gold Integrated Human Practice](Gold)