Part:BBa_K3989024

EsaR-PesaRC-GFP

Testing construct of the promoter P_esaRC(<a href="https://parts.igem.org/Part:BBa_K3989008"> BBa_K3989008 </a>).

Structure

The goal is to test the sensitivity of P_esaRC to a certain AHL molecule: 3OC6HSL. See the plasmid map in figure 1.

Figure 1.The structure of the promoter testing construct.

This construct consists three parts: a constitutively expressed EsaR protein controlled by lac operon, the P_esaRC promoter and a reporter GFP gene downstream. The EsaR protein can be changed by its variants(<a href="https://parts.igem.org/Part:BBa_K3989003"> BBa_K3989003 </a>, <a href="https://parts.igem.org/Part:BBa_K3989004"> BBa_K3989004 </a>, <a href="https://parts.igem.org/Part:BBa_K3989005"> BBa_K3989005 </a>) and so does the promoter(<a href="https://parts.igem.org/Part:BBa_K3989009"> BBa_K23989009 </a>). If one wants to use the promoter later after the test, the GFP can also be changed to other functional gene.

Function

The way it works is rather simple: first we make sure the EsaR protein's existence. After the expression of the protein, it can bind to the promoter downstream and regulate the GFP expression under the control of the AHL molecule. In this case, the existence of AHL molecule will up-regulate the expression of the GFP. Thus, we can see a green fluorescence if we culture the cell containing this construct with AHL molecule.

A similar construct is designed to test the promoter P_esaS(<a href="https://parts.igem.org/Part:BBa_K3989009"> BBa_K3989009 </a>).