Part:BBa_K2354008:Experience

Applications of BBa_K2354008

This result is the composite part of K2354008

We cloned the sequence of ER-alpha and Monobody into the vector, and then we transformed the plasmid into BL-21 competent cells, respectively. After transformation, we extracted both plasmids from the cells and the vector was validated by gel electrophoresis.

E. coli with gene of monobody

A successful cloning was verified from the results of a PCR performed with specifically designed primers according to the theoretically expected length of ER-alpha_INP fusion gene and Monobody (797bp).

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1 : RFP ( mRFP F-primer and mRFP R-primer ); 2 : IPTG (promoter) + INP + RFP2 (ER F-primer and ER R-primer ); 3 : IPTG (promoter) + INP + RFP 1 (ER F-primer and ER R-primer ) ; 4 : IPTG (promoter) + ER with red spot (ER F-primer and ER R-primer ); 5 : IPTG (promoter) + ER2 (ER F-primer and ER R-primer ); 6 : IPTG (promoter) + ER1 (ER F-primer and ER R-primer ); 7 : IPTG (promoter) + Monobody with red spot (Monobody F-primer and Monobody R-primer ); 8 : IPTG (promoter) + Monobody 2 (Monobody F-primer and Monobody R-primer ) ; 9 : IPTG (promoter) + Monobody 1 (Monobody F-primer and Monobody R-primer ); 10 : RFP ( VR primer and VF2 primer ); 11 : IPTG (promoter) + INP + RFP 2 ( VR primer and VF2 primer ); 12 : IPTG (promoter) + INP + RFP 1 ( VR primer and VF2 primer ); 13 : IPTG (promoter) + ER with red spot ( VR primer and VF2 primer ); 14 : IPTG (promoter) + ER2 ( VR primer and VF2 primer ); 15 : IPTG (promoter) + ER1 ( VR primer and VF2 primer ); 16 : IPTG (promoter) + Monobody with red spot ( VR primer and VF2 primer ); 17 : IPTG (promoter) + Monobody 2 ( VR primer and VF2 primer ); 18 : IPTG (promoter) + Monobody 1 ( VR primer and VF2 primer )

To prove that our detection system can distinguish the sample has EDCs or not, we used IR spectrum to measure specific bonds on E. coli and verify the detection function.(Table 1)

To decrease the activity of E. coli, we tried to freeze E. coli in -80℃ for 24 hours and use it after thawing on ice immediately. We found that there is a significant difference between the sample with 5mM EDCs and EDCs-free and the intensity of IR signals also decrease due to the reduction of mobility of E. coli. This result can prove that our detection system can detect EDCs in the water.

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The IR spectrum of samples in different conditions (freezed E. coli)

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