Team:Imperial College London/Modelling/Experiments

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Modelling Overview | Detection Model | Signaling Model | Fast Response Model | Interactions
A major part of the project consisted of modelling each module. This enabled us to decide which ideas we should implement. Look at the Fast Response page for a great example of how modelling has made a major impact on our design!
Interaction between Dry-Lab and Wet-Lab
Diagram of engineering cycle
Diagram representing the engineering cycle.

Engineering approach to the project

1. Influence of specification on the design and vice versa:

  • This was one of the most time-consuming steps as we were struggling to compromise the specifications of the viable designs.

2. Influence of design on modelling and vice versa:

  • All modelling was meant to give answers to questions that arose during the design phase.
  • Once the designs were chosen, they were modelled. It was found that 2-step amplification is not likely to be effiecient, so it was decided that only 1-step amplification will be taken forward to assembly. This was a significant conclusion as it would take weeks in the labroatory to reach this conclusion.
  • The question whether a sufficient AIP gradient could be established in the extracellular space to set off receptor was answered by modelling. The model allowed to determine under which conditions the system would work.

3. Influence of modelling on assembly and vice versa:

  • The results from modelling allowed to progress with the assembly.

4. Influence of assembly on testing and vice versa:

  • Testing has been planned ahead, so assembly contructs have been modified to allow some testing methods, e.g. purification or negative control.

5. Influence of testing on specifications and vice versa:

  • This step has not been implemented yet. However, if the specifications were not met by the results, we would need to try to redesign the system or change the specifications (in case there was no other alternatives).

6. Influence of components which are not adjacent to each other in the cycle:

  • Testing may influence modelling as the results of the two might not match.
  • Many experiments were designed specifically on the request of the modelling team in order to find the necessary parameters for the models. Obtaining these paramters would increase the reliability of the models.
Wet-Lab Experiments for Dry-Lab
Output Amplification Model
  1. Determine the maximum concentration of sD that cells can produce (in vivo): Compare activity with 2.
  2. Determine how much XylE we need to produce prior to adding Catechol (in vitro first, maybe in vivo afterwards). In vivo IPTG: Compare cultures that have less of it.
  3. Determine XylE and TEV production (in vivo). Use robot to induce production and measure activities of TEV (FRET pairs with TEV link).
  4. Degradation of XylE (in vivo or in vitro if cell division is not taken into account). Monitoring activity, then approximate the concentration. Remove the IPTG.
  5. Determine TEV kinetics (kcat, Km) on XylE-GFP (in vitro).

Protein Display Model
  1. Kinetic constants (kcat, Km) of TEV acting on the display peptide.
  2. Production rate of peptide.
  3. Total number of proteins expressed on the cell wall.
  4. Number of free floating proteins without cleaving by TEV (or the ratio of the above).
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