Revision as of 09:32, 11 October 2014

Biobrick calable of forming pattern having the mathematical meaning of parabola and hyperbola

What it is

Biobrick K1412002 is the base of this part. We add promoter pTETR in the front of BBa_K20600. In order to realize our goal, we also ligate pCons and TetR to control the express of BBa_K20600 with pTETR.

More informtion: BBa_K1412002

What it does

When TETR expresses, promoter pTETR can be inhibit. So the lacI can’t work on the promoter pLacI. Our goal gene CheZ can be express, which can recovery chemotaxis of bacteria. But if we add anhydrotetracycline (aTc) in the culture medium, which can restrain the express of TETR, situation can be different. lacI restrain the express of promoter pLacI, the CheZ can’t express.

How to use it

To achieve our goal to form hyperbolic curve and parabola, we use anhydrotetracycline (aTc) and Isopropyl β-D-1-Thiogalactopyranosid (IPTG) as the inhibitor and inductor to regulate to whole circuit.

We use pTET as the substitution for pBAD because when cultivating the bacteria in a long time (about 24 hours) with the inhibitor L-Arabinose, the bacteria may use the L-Arabinose as carbon source. On the contrary, the bacteria will tend to the L-Arabinose. Due to the deficiency caused by the inductor L-Arabinose, we choose aTc to abtain our goal which lead the bacteria tend to oppose direction of the location where is the aTc on the medium plate.

We use M63 semi-solid plate to observe the behavior of E.coli(CL-1). We dot proper concentration of aTc and IPTG with a distance of 1.5 cm. After the two spots dries up, we dot 3μL bacteria on the IPTG, then place the plate at 37℃. By tracking and measuring the chemotaxis diameter of the bacteria on the plate, we get a series of experimental data, more detail in Experimental Data.

Experimental Data

Sequence and Features