Part:BBa_K2039001:Experience

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Applications of BBa_K2039001

Test of the dimerization system with a tripartite GFP

We transformed E.coli with pSB1C3 coding for FKBP-GFP10 and FRB-GFP11 and pUC19 coding for the third part of GFP as we could not clone GFP1.9 in pSB1C3. Transformed cells where then incubated with the dimerization agent, rapalog. We try several concentration of rapalog but we did not see any GFP fluorescence with flow cytometer.

Figure 5: : No GFP florescence is observe with rapalog All the rapalog concentrations tested (5nM, 50nM, 500nM) display a signal inferior compared to the negative control.

We did not obtain the fluorescent signal that we expected with the dimerization agent. We did not have time to investigate further why the system did not work, but we have several ideas. We may have some expression issues with FRB*-GFP11 and FKBP-GFP10 as the western blot done with monoclonal antibody anti-GFP allow the revelation of GFP1.9 only. Another possibility is that there is some physical constraint that prevent GFP assembly, the linker length for example can generate this kind of constraint. Finally, the system can by well-constructed and expressed but we may not have found the optimal conditions to induce the dimerization (concentration of rapalog, timing, temperature).

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