Experimental Results of the Basic Parts

Verification of ΔcheZ strain (protocol)

    The size of colonies of E.coli strain RP1616 was much smaller than that E.coli steain RP437 under the same circumstance and after same period of incubation time(about 10h), and the result is shown in Figure1. In colony PCR using the primers of cheZ gene following , RP437 absolutely has much more outcomes than RP1616 and we conclude that RP1616 is actually a ΔcheZ strain.

Figure1.The result of colony PCR(From left to right, the first lane is the marker, the third and the forth lane is the PCR outcome of strain RP437 and strain RP1616, the sixth and the seventh lane is the PCR outcome of strain RP437 and strain RP1616.)

Verification of the function of the constructed Aptamer-cheZ part(protocol)

    From the results shown in Figure2. We can be sure that the Aptamer-cheZ part actually works effectively, especially on 0.3% Semi-solid medium.

Figure2. The growing state of the reprogrammed bacteria with Aptamer-cheZ part(Left:0.3%agar with 0mM Thephylline, Right:0.3%agar with 0.25mM Thephylline)

Verification of Toggle-switch (protocol)

Figure3.A conlony of the bacteria with the original Toggle Switch exhibit two different states(4X Objective)

By calculating with the help of the fluorescence microscope,the ratio between the numbers of colonies with RFP and colonies with GFP ≈ 8:25. It means the original Toggle Switch is not fit for our purpose, so we modify the original by luxPR-cI device.

Modulate Toggle-switches to produce more balanced ratio (protocol)

Numbers of colonies with RFP: Numbers of colonies with GFP ≈ 6:1

Test of Incorporated Riboswitch into one side of Toggle-switch (protocol)

Verification of the constructed system’s function (protocol)

• 6 tubes of constructed monoclonal RP1616

• Results of the sixth tube