Part:BBa_K1412000
CheZ generator under Lac promoter
This part is consist of Lac promoter and CheZ generator.
CheZ can dephosphorylate CheY-P to CheY. CheY could make the flagellar motor rotate counterclockwise so that the cell could swim. Without CheZ, CheY-P is phosphorylated, which could bind to the flagellar motor protein FliM, causing the cell to tumble. The expression of CheZ allows E.coli to navigate gradients of natural chemoattractants.
At the same time, we know that Lac promoter is an inverting regulator sensitive to LacI and CAP, while LacI can be inhibited by IPTG. With LacI protein, CAP protein and IPTG, we can adjust the expression of CheZ via Lac promoter to control the movement of E.coli. The part BBa_K1412001 has already been used to govern E.coli chemotaxis successfully.
Usage and Biology
Sequence and Features
- 10COMPATIBLE WITH RFC[10]
- 12COMPATIBLE WITH RFC[12]
- 21COMPATIBLE WITH RFC[21]
- 23COMPATIBLE WITH RFC[23]
- 25COMPATIBLE WITH RFC[25]
- 1000COMPATIBLE WITH RFC[1000]
Experimental Data
The comparison of chemotaxis ability with device BBa_J04450 and BBa_K1412000
CheZ and LacI are both knocked out of the genome of CL-1, thus CL-1 does not have the ability of chemotaxis and will not inhibit the expression of Lac promoter. Therefore CL-1 could express CheZ in BBa_K1412000 to regain chemotaxis ability. While with BBa_J04450 for comparison, no chemotaxis ability could be observed. All of the above are reflected on the difference in the diameter of chemotaxis: d2 > d1.
We use M63 semi-solid plate to observe the behavior of the two E.coli(CL-1) strain. We spotted 3μL of the cells on the same plate, then place the plate at 37℃. By comparing the chemotaxis diameter of the bacteria on the plate, we conclude that BBa_K1412000 could endow chemotaxis ability to CL-1.
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