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| − | <p><strong>Figure 1: pRIG15_13.</strong>
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| − | To generate a single chain variable fragment against dihydroxyacid dehydratase the group of Prof. Dr. Dübel used a human naive antibody gene library. <sup><a class="fn_top" href="#fn__1" id="fnt__1" name="fnt__1">1)</a></sup> They thankfully provided us with the sequence of the anti-dihydroxyacid dehydratase already cloned into an expression vector.<br>
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| − | To insert the sequence for the <i>Salmonella</i> antibody (anti-dehydroxyacid dehydratase) into <a href="http://parts.igem.org/Part:pSB1C3" target="_blank">pSB1C3</a>, we designed Gibson primers with compatible overhangs that also included the start codon ATG. This fragment was amplified via <a clas="wikilink1" href="https://2015.igem.org/Team:Freiburg/Labjournals/Cloning/August#PCRbb13" title="PCRbb13">PCR</a> from the expression vector we obtained from Prof. Dr. Dübel and then assembled with the digested <a href="http://parts.igem.org/Part:pSB1C3" target="_blank">pSB1C3</a> backbone using <a class="wikilink1" href="https://2015.igem.org/Team:Freiburg/Project/Classic_vs_Gibson" title="Gibson">Gibson Assembly</a>.
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| − | To prove correct insertion of our fragment we performed a test digest and verified the part by sequencing.
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| − | We used the plasmids kindly provided by Prof. Dr. Dübel to express both proteins, <i>Salmonella</i> dihydroxyacid dehydratase and anti-dihydroxyacid dehydratase, in <i>E.coli</i>. We could show overexpression by SDS-PAGE (figure 2) and verified the interaction of both proteins by Western Blot (figure 3).
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| − | <p><strong>Figure 2: 12,5% SDS-PAGE analysis of the protein purification of <a href="http://parts.igem.org/Part:BBa_K1621006"><i>S</i>. Typhimurium antigen</a> (dehydroxyacid dehydratase) and <i>S</i>. Typhimurium antibody (anti-dehydroxyacid dehydratase).</strong> Protein purification was performed with gravity flow columns and Ni-NTA Agarose. The protein was eluated by 500mM Imidazole. The expected molecular weight for the <i>S.</i> Typhimurium antigen is 63 kDa and 37 kDa for the antibody, respectively. FT-Flowthrough, W-Wash, E-Elution.</p>
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| − | <p><strong>Figure 3: Western Blot of <a href="http://parts.igem.org/Part:BBa_K1621006"><i>S.</i> Typhimurium antigen</a> (dehydroxyacid dehydratase) and <i>S.</i> Typhimurium antibody (anti-dehydroxyacid dehydratase).</strong> (A) Western Blot of the antigen as well as of the antibody with anti-His HRP Conjugate. Both protein are His-tagged. The expected molecular weight for the <i>S.</i> Typhimurium antigen is 63 kDa and 37 kDa for the antibody, respectively. (B) In this Western Blot the <i>S.</i> Typhimurium antigen was analyzed by 12,5% SDS-PAGE. Purified <i>S.</i> Typhimurium antibody was used in a 1:100 dilution. Additionally, this single chain antibody is fused to a c-Myc Tag. We used an anti-c-Myc antibody (1:1000; rabbit). For detection the anti-rabbit HRP antibody (1:5000) was used.</p>
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| − | <div class="fn"><sup><a class="fn_bot" href="#fnt__1" id="fn__1" name="fn__1">1)</a></sup>
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| − | <a class="urlextern" href="http://www.ncbi.nlm.nih.gov/pubmed/22703709" rel="nofollow" target="_Blank" title="http://www.ncbi.nlm.nih.gov/pubmed/22703709"> Meyer et al. 2012. Identification of immunogenic proteins and generation of antibodies against Salmonella Typhimurium using phage display. BMC biotechnology</a></div>
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