Team:NTNU-Trondheim/Model
From 2013.igem.org
![header](https://static.igem.org/mediawiki/2013/5/55/Logo-ntnu.png)
The Pm/Xyls promotor system is a positive regulator system where the regulator molcule, Xyls, is constitutivly produced. When Xyls binds to the inducer, m-toluic acid, this complex is able to bind to the Pm promoter(see figure 1). Binding to the promoter facilitates binding of RNA polymerase (RNAp) making it active (RNApa). This enables the production of mRNA in (1) elongation step, and (2) translation. The mRNA will be translated into the recombinant protein, or in our case, RFP. Over time mRNA and RFP will be degraded to some extent.
![](https://static.igem.org/mediawiki/2013/d/d1/Modelpic.jpg)
Figure: Overview of how the Pm/Xyls Promotor system funtions. Production of recombinant protein is dependent on access to the indicer m-toluic acid.
The reaction equations in the Pm/Xyls promotor system are listed below. The degradation of mRNA and RFP will inhibit an exponential growth in their production, and after some time the levels of mRNA and RFP will stabilize around a steady state.
![](https://static.igem.org/mediawiki/2013/c/c6/Modeleq.jpg)
Figure:
![](https://static.igem.org/mediawiki/2013/0/08/Cainpic.jpg)
Figure 2: Overview of parameters applied in the Cain program
Varies starter concentration of inducer (0, 0.06, 0.3, 0.6, 1.2 and 6 µM) gave the result as indicated in figure 3 and the table below.
![](https://static.igem.org/mediawiki/2013/9/98/Model123.jpg)
Figure 3: Different concentrations of inducer (0 to 6 uM) was applyed in the deterministic simulations, yeilding different amounts of RFP.
Start consentration (µM) of inducer | Molecules of inducer | Consentration (µM) of RFP (steady state) | Molcules of RFP (steady state) |
---|---|---|---|
0 | 0 | 0 | 0 |
0.06 | 100 | 0.51 | 850 |
0.3 | 500 | 0.63 | 1050 |
0.6 | 1000 | 0.66 | 1100 |
1.2 | 2000 | 0.68 | 1135 |
6.0 | 10 000 | 0.71 | 1180 |