Team:Tsinghua/Result2

From 2009.igem.org

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(Co-Functioning of Therapeutic DNA with GenSniper Genome)
(Co-Functioning of Therapeutic DNA with GenSniper Genome)
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The next crucial step is that Theraputic DNA can be packaged into the GenSniper genome. As showed in the results of Module I, we have gained the desired the GenSniper viroin without Therapeutic DNA packaging. When we further co-tranformed the GenSniper genome and Therapeutic DNA for GenSniper viroin production with the packaged DNA, the purified solution also contains the desired protein complex.
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In addition, PCR identification of cos site indicates positive result.
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[[Image:electrocos.png|600px|center|electrocos|thumb|Electronic spectroscopy picture of the GenSniper viroin with Therapeutic DNA package and without Targeted Biobrick modification]]
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[[Image:electro0.png|600px|center|electro0|thumb|Electronic spectroscopy picture of the control group]]
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[[Image:cosPCR.png|600px|center|cosPCR]]

Revision as of 18:16, 18 October 2009

Construction and Characterization of Therapeutic DNA

Map of the Therapeutic DNA

The map of the Therapeutic DNA is listed above. It contains a incorporated cos site, O and P genes for replication and RFP expression segment. We should note that the RFP expression module in this Therapeutic DNA is downstream a prokaryotic promoter, which enable us to trace the function of the Therapeutic DNA according to red fluorescence. However, when applied to clinical use, the RFP expression segment can be replaced by the real therapeutic genes.

Agarose Gel Electrophoresis of Therapeutic DNA
PCR identification of cos site in Therapeutic DNA

We have completed the construction of Therapeutic DNA and proved that it contains the cos site for the package into the GenSniper viroin through PCR.

RFP Expression of Therapeutic DNA. A. after 20h culture of bacteria containing Therapeutic DNA, the culture media turned red; B. Amp Plate with bacteria containing Therapeutic DNA; C. Kan Plate with bacteria containing Therapeutic DNA

In theory, the therapeutic DNA should enable the bacteria containing it to express RFP. Fortunately, the red fluorescent was so strong to be observed via naked eyes. Fluorescence microscopy also confirmed our observation.

Since the original Part_J61031 contains both Kan and Amp resistance, which will render the incompatibility for Therapeutic DNA and pET-28a-based constructs, we moecularly cutted the region of Kan-Amp resistance and reconstructed a cosmid with only Amp resistance gene. B shows the plate with Amp and Therapeutic DNA transformed E.coli. C shows the plate with Kan and Therapeutic DNA transformed E.coli. These results suggests that the single resistance "cosmid" has been successfully constructed.

Red fluorescence identification of therapeutic DNA containing bacteria by fluorescence microscopy. Excitation is wide-spectrum. A.Bright Field; B.Red fluorescence identification at the same field

Co-Functioning of Therapeutic DNA with GenSniper Genome

Co-tranformation between Therapeutic DNA (cosmid) and GenSniper genome(pET+pAC,both of them encoding the GenSniper genes). A.transformed cells with pAC+cosmid can grow at 1/2Cm+Amp plate; B.transformed cells with cosmid cannot grow at 1/2Cm+Amp plate; C.transformed cells with pET+cosmid can grow at 1/2Kan+Amp plate;D.transformed cells with cosmid cannot grow at 1/2Kan+Amp plate. pET is the short form of pET-28a+Nu1+A+W+B, pAC is the short form of pACYCDuet-1+lysis+C+D+E+FI+FII, cosmid equals Therapeutic DNA
lambda+cos,A1/3K1/3C

The next crucial step is that Theraputic DNA can be packaged into the GenSniper genome. As showed in the results of Module I, we have gained the desired the GenSniper viroin without Therapeutic DNA packaging. When we further co-tranformed the GenSniper genome and Therapeutic DNA for GenSniper viroin production with the packaged DNA, the purified solution also contains the desired protein complex.

In addition, PCR identification of cos site indicates positive result.

Electronic spectroscopy picture of the GenSniper viroin with Therapeutic DNA package and without Targeted Biobrick modification
Electronic spectroscopy picture of the control group
cosPCR