IGEM:IMPERIAL/2006/project/Oscillator/project browser/Prey Construct/Design

From OpenWetWare
Jump to navigationJump to search
Super Parts Molecular Prey-Predator Oscillator
Actual Part J37015page.JPG
Sub Parts Test Sensing Prey Construct <bbpart>C0261</bbpart> <bbpart>I13401</bbpart>



Design Choices

  • Research into the registry directed us to use AHL as our prey molecule.
  • Design allows for an exponential increase of AHL (to fulfil the Lotka-Volterra model) via a positive feedback loop.
  • The prey part can be decoupled into a prey sensing part and a prey producing part.
  • Initiation of positive feedback loop depends on leaky expression of the tetR promoter which is a constitutive promoter.
    • This leaky expression produces LuxR which can form a dimer with AHL already withing the cell.
    • LuxR, AHL and promoter control the expression of LuxI which produces AHL.
  • Design allows for assesment of status of positive feedback loop via:
    • GFP Production - Linked to LuxI expression
    • AHL Production - Can be indirectly assessed according to J37015 protocol.

INPUTS biological component comments
AHL LuxR & pLuxR To initiate the positive feedback loop, LuxR is produced via leaky expression of the tetR promoter.
OUTPUTS biological component comments
AHL LuxI LuxR, AHL and pLuxR form a complex, activating production of LuxI expression which causes enzymatic generation of AHL

Open Issues

  • We need to consider methods of controlling the positive feedback loop while cells are growing to ensure AHL concentration stays at zero. Possible suggestions are:
  • Periodic dilution of culture to allow degradation of LuxI
  • Riboswitch
  • Pops blocker

<html> <!-- Start of StatCounter Code --> <script type="text/javascript" language="javascript"> var sc_project=1999441; var sc_invisible=1; var sc_partition=18; var sc_security="18996820"; </script>

<script type="text/javascript" language="javascript" src="http://www.statcounter.com/counter/frames.js"></script><noscript><a href="http://www.statcounter.com/" target="_blank"><img src="http://c19.statcounter.com/counter.php?sc_project=1999441&amp;java=0&amp;security=18996820&amp;invisible=1" alt="website statistics" border="0"></a> </noscript> <!-- End of StatCounter Code --> </html>