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This part has been characterized under the control of the pT7 T7 RNA polymerase promoter (part K606035) in E. coli BL21 strain.
Fluorescence kinetics
The measurements have been carried out on a spectrophotometer, at 37°C under transient shaking. The experiment lasted 4h, we tested several colonies and several IPTG concentrations. The OD 600nm and the fluorescence of the GFP (excitation: 470nm / emission:515 nm) was measured every 5 min, and the ratio of the two was calculated.
All values were normalized by substracting the fluorescence/OD value of the well with 0 mM IPTG at time 0. The values given are in arbitrary units.
After 2 hrs of induction, we see a clear increase of the fluorescence proportional to the IPTG concentration (that is to say with the quantity of T7 polymerase induced in the cell). After 4 hrs, the expression of GFP under the pT7 is still not saturated
Here, we plot the ratio of induction of the T7 polymerase dependant construct for the different concentrations of IPTG at a given time (4 hrs), taking the well with 0 IPTG at time 0 as the reference.
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