Team:NTU-Singapore/Project/Wetlab

From 2009.igem.org

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(Characterization of J23119)
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Based on our preliminary characterization results, it appeared that J23101 produced a much stronger signal than J23119 and pTet. This was quite surprising because J23119 family is supposed to be stronger then the J23101 family.
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Based on our preliminary characterization results, it appeared that J23101 produced a much stronger signal than J23119 and pTet. This was quite surprising because J23119 promoter is supposed to be stronger then the J23101.
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J23119 performance appeared to be the best in Origami B.
J23119 performance appeared to be the best in Origami B.
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== R0010-B0034-CHE-B0015 (K256028) ==
== R0010-B0034-CHE-B0015 (K256028) ==

Revision as of 00:37, 22 October 2009

Conclusive Results


Our working constructs!

  • J23119-B0034-NorR-B0015, is a system construct, in that it was intended for our system to feature this as a functional part.
  • J23119-B0034-GFP-B0015, is a characterization construct to characterize the modular function of the J23119 promoter in the transcription of NorR.
  • Lac(R0010)-B0034-CHE-B0015, is also a test construct to only test and characterize the enzymatic activity of CHE.
  • J23119-B0034-IFP-B0015-J23119-B0034-HO1(I15008)-B0015, is a test construct to only test the reporting ability of IFP.


NorR System Construct Characterization

NorR is an important NO sensor that triggers the transcription at pNO. Thus, we want an NorR producing construct to improve on the sensitivity of pNO.


Double Digest verification

NTUnorrgel2.jpg



Successful construct verification of J23119-B0034-NorR-B0015 by Double Digestion!

SDS PAGE verification of NorR

NTUnorrsds.jpg

Successful expression of NorR

SDS PAGE characterization of NorR

NTUnorrsds2.jpg

SDS PAGE results for NorR expressed at different inoculation temperatures


Since the sole purpose of J23119-B0034-NorR-B0015 () is to produce NorR, we shall dwell into the factors that might affect the production of the protein. The transformed cells were incubated at 3 different environmental temperatures (30 / 37 / 42°C).

SDS PAGE characterization was carried out (top right).


It has been observed that at elevated temperature, i.e. 42°C, production of NorR had decreased as shown by the diminished intensity (see 2nd lane). The production of NorR at 30°C and 37°C carried no significant difference.


Characterization of J23119

Since J23119 () was used as the constitutive promoter for NorR producing construct, it is necessary for us to understand its modular function and how it would affect NorR production.


NTU119temp.png

Characterization of J23119 w.r.t Temp (deg C)


Preliminary characterisation of J23119 showed that the activity of the promoter to be the strongest at 25°C and weakest at 37°C with 30°C being something of an intermediate. Activity of the J23119 was independent of time. Noteworthy was that there was a drastic drop in activity of the J23119 promoter at 16min, 37°C.


NTU119culture.png

Average GFP/OD of J23119-GFP in different medium


It shows that the supplemented M9 medium is the ideal choice for the characterization of the J23119 promoter. M9 is most likely to be the ideal medium for characterisation of other promoters in general.


NTU119backbone.png

Average GFP/OD of J23119-GFP in steady state (M9)


Vector backbone did not seem to have much of an effect on the strengths of J23119, although pSB1A2 has a slight positive effect on the activity of the J23119.


NTU119diffprom.png

Comparison of J23119 with other promoters


Based on our preliminary characterization results, it appeared that J23101 produced a much stronger signal than J23119 and pTet. This was quite surprising because J23119 promoter is supposed to be stronger then the J23101.


NTU119diffchassis.png

Characterization of J23119 in different chassis


J23119 performance appeared to be the best in Origami B.

R0010-B0034-CHE-B0015 (K256028)

To examine the enzymatic activity of cholesteryl esterase, a test construct was synthesized. CHE production was induced by l0mM lactose. The cells were sonicated, and the cell lysate containing CHE was characterized using Amplex® Red Cholesterol Assay Kit. The characterization results is shown below.

NTUcheresult.png


Cholesterol Assay with CHE Construct



From the graph, the cell lysate containing CHE had achieved higher fluorescence readings than the negative control. The increase in fluorescence reading is due to enzyme-coupled reaction that detects free cholesterol concentration. Hence, we have proven that CHE had indeed been produced from this construct and had been working to our expectation.



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