Difference between revisions of "Part:BBa K3332081"

Revision as of 10:39, 27 October 2020

pBAD/araC promoter-Inverter-mazF-terminator

It can express toxin protein according to the concentration of arabinose.It ensures that our engineering bacteria die when the concentration of glyphosate is low to a certain level.

Usage and Biology

Fig1. Circuit

The application of proBAD/araC-RBS-MazF was to monitor the protein toxicity of MazF, under the induction of arabinose, to accomplish the toxicity modeling and characteristic inverter/MazF.

Characterization

When we were building this circuit, we did the nucleic acid gel electrophoresis experiment to verify. After the circuit was built, we sent the plasmid to sequence, and got the correct sequencing. After new molecular cloning experiments, we did Enzyme-Cut identification to certify the plasmid is correct. We used the EcoR I and Pst I to cut the plasmid, then we got the target separate fragment-2096bp

Fig.2 proBAD/araC-B0034-MazF-terminator _pSB1C3 (BBa_K3332083) colony PCR (about 2687 bp) Protocol

1. Preparation of stock solution

Dissolve arabinose in ddH2O to make 100× stock solution（the work concentration is 0.2%）

2.Culture glycerol bacteria containing the corresponding plasmid in test tube for 12h.

3.Add 4mL of the above bacterial solution into 200 mL LB medium and maintain the culture condition at 37 ℃ and 180 rpm.

4.Add 2mL arabinose stock solution into the induction group when OD600 increased to 1.0

5.Induce for 18 hours and the condition is the same as before.

6.Then, sampling 5µL culture to dilute 106 times and take 50µL diluted solution to spread across a petri plate.

7.After 14 hours, count the number of groups of E. coli

Here is the result:

We discovered that the number of live E. coli decreased significantly after 5 hours, while there was no significant change in the non-induced group, which can verified that MazF have the function of killing E. coli. Sequence and Features