Construction and Testing

From 2007.igem.org

Construction Tree

The diagram below outlines our parallel construction plan, from individual registry parts to the final half-adder. Because many people were working on the project at once, it is designed to keep everyone organised.

Construction Chart

Diagram details:

• Vector resistances are shown, with shades of blue representing ampicillin and shades of red representing kanamycin so it is easy to check which media is needed.
• Fragments all have names small enough to write on a microfuge tube cap. To make the subtle distinction between a coding sequence and a coding sequence and a ribosome binding site, we use a ' on the computer and an underline when writing. A double ' or double underline, indicates a coding sequence with a ribosome binding site and a transcriptional terminator. This helps keep our microfuge caps legible.
• Expected fragment sizes are shown at every node so gel results can be analyzed quickly.
• Arrows show which way DNA is moving and which restriction enzymes to use for cutting. Hollow arrows are present when two vectors of the same resistance are being joined and treatment with alkaline phosphatase or a gel extraction is needed to remove contaminating vector.
• The numbers 1-2-3-3.5-4 show the major steps that need to be done at each step of way. Our protocols are all written around this system.

Testing Constructs

Making use of flurorescent proteins(GFP and RFP) as reporter genes - use of indicuble promoters to...

Comparing basal and induced expression levels for the quorum sensing promoters

CONSTRUCT	AIMS
	The quorum-sensing promoters: How active is 'unactivated' Plas and Plux? preliminary test for the basal levels of activity of the positively-controlled quorum sensing promoters
	The quorum-sensing constructs: How off is 'off' and how on is 'on'?</br> test for levels of expression in the unenhanced versus enhanced state xR must be expressed in same strain as Px; xI can be expressed in a different strain since its AHL is diffusable both strains grown in a single culture tube

Testing functionality of the various promoters

CONSTRUCT	AIMS
	The Omp promoter postively-controlled promoter activated by endogenous OmpR protein (sensitive to salt concentrations via EnvZ protein) test for activity using high salt levels in EnvZ+ strain test for activity using the photo-active red system in EnvZ- strain
	The Tet promoter and operator negatively-controlled promoter, repressed by TetR and derepressed by the inducer tetracycline test for levels of expression during repressed versus derepressed state
	The quorum-sensing promoters: Plas and Plux as above
	The PlasOcI promoter-operator fusion negatively- and positively-controlled promoter in the final half adder design, repressed by cI and enhanced by LasR testfor activity in the repressed versus enhanced state test in addition to above construct since operator fusion may affect promoter activity

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