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Project

• Overview
  • Data Page
  • Accomplishments
  • Post-Jamboree
• Human Practices
  • Initiative
  • Interviews
  • Design
  • Killswitch
  • Regulation
  • Kill Genes
  • Safety
• FRED
  • Toxin Sensing
  • Electroreporting
  • Modelling
  • Device Prototype
• OSCAR
  • Decarboxylation
  • Decatecholization
  • Flux Analysis
  • Bioreactor
  • Upgrading
  • Desulfurization
  • Denitrogenation
• Synergy
• References
• Attributions

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Background

Given that oil sands tailings ponds contain significant amounts of magnesium and low levels manganese, and that the MgtA and MntP expression platforms are repressed by these conditions respectively, these systems are not appropriate for the bioreactor in a typical tailings pond site (FIND PAPER WHICH CITES IONs in TP). In order to ensure that the kill genes would be activated should bacteria escape from the bioreactor, we required a control element which would be expressed under conditions in typical tailings ponds. To this end, we selected a rhamnose inducible promoter from Eschericia coli as a potential method for regulating our kill gene combination.

The rhamnose inducible system is optimal in the bioreactor since the promoter is tightly repressed with the presence of glucose. We aim to supplement the bioreactor with low levels of glucose so that the kill genes downstream of the promoter would be repressed. In the event of escape into the tailings ponds, glucose levels would be insufficient for repression of the system, which would thus activate expression of the kill genes.

Although our team has also characterized a molydenum-repressed MOCO riboswitch as an additional control mechanism suitable to the bioreactor, we investigated the rhamnose promoter because of the lower cost and availability of the repression agent.