Team:Heidelberg/Delftibactin/DelRest

From 2013.igem.org

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                                   <h1>Week 11</h1>
                                   <h1>Week 11</h1>
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                                   <p style="font-size:10pt; text-align:justify; position:relative; margin-left:6%;">
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During the past week we managed to amplify a single fragment of 11 kbp including the genes DelA to DelF from genomic DNA of <i>D. Acidovorans</i>. Furthermore we were able to equip our biobrick backbone pSB4K5 with the desired overlaps to the genes of the Delftibactin cluster. We also succeeded in the amplification of the very last gene in our construct, DelL. However still a lot of work has to be done, since the amplification of DelF-G and DelO-P turned out to be more complicated. Since our initial plan, to amplify DelO-P with a Gibson primer which includes an overlaps to DelL and furthermore introduces an artificial ribosom binding site, turned out to be quite ambitious, we orderd shorter versions of all our Gibson primers, used to amplify genomic DNA. Using these shorter primers which should anneal better we will try to preamplify the desired genes in order to obtain a specific template for the amplification with the needed overlaps. Furthermore we will optimize the PCR conditions for the amplification of DelF-G.
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During the past week we managed to amplify a fragment of 11 kbp encoding the genes DelA to DelF from genomic DNA of <i>D. Acidovorans</i>. We were further able to amplify the backbone fragment from pSB4K5 carrying the desired overlaps to the genes of the Del cluster. We also succeeded in the amplification of the very last gene in our construct, DelL. Unfortunately, the amplification of DelF-G and DelO-P turned out to be more complicated than expected. Since our initial plan to amplify DelO-P with a Gibson primer which introduces an overlap to DelL and furthermore introduces an artificial ribosom binding site turned out to be too ambitious, we changed our strategy. We orderd shorter versions of all our Gibson primers. Using these shorter primers not bearing any overlaps to other fragments, we will try to amplify the desired genes in order to obtain a specific template for the reamplification with the primers carrying the needed overlaps. Furthermore, we will optimize the PCR conditions for the amplification of DelF-G.
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                                   </p>
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                                   <p style="font-size:10pt; text-align:justify; position:relative; margin-left:6%;">
                                   <p style="font-size:10pt; text-align:justify; position:relative; margin-left:6%;">
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By the end of last week we decided that the short primers we had ordered in the previous week did not improve amplification of the missing genes from <i>D. Acidovorans </i>. Also the amplification of DelF-G did not proceed as expected. Additionly, further analysis of the Delftibactin cluster, led to the discovery of another putative promotor in front of DelO-P. Therefore we not only decided to design new primers for the sequenceregion of DelFG but also modified the entire strategy and our construct in concerns of DelOP. To ensure the expression of DelOP in our target organism <i> E.coli </i> we decided to introduce this promotor in our final vector. Logically new primers were ordered for this region but as we still want to use Gibson cloning also the very last fragment of DelA-G has now to be amplified with an overlap, matching the promotor in front of DelOP. The correlating primers can be found in our new vector map.
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By the end of last week we decided that the short primers we had ordered in the previous week did not improve amplification of the missing genes from <i>D. Acidovorans </i>. Also the amplification of DelF-G did not proceed as we hoped. Additionly, further analysis of the Delftibactin cluster, led to the discovery of another predicted promoter present in front of DelOP and potentially essential for DelOP expression. Therefore we not only decided to design new primers for the amplyfication of DelFG, but also modified the entire strategy concerning the DelOP fragment. To ensure the expression of DelOP in our target organism <i> E.coli </i> we decided to amplify DelOP together with its putative promoter and thereby introduce it into the final construct. In consequence, we ordered new primers for this region but as we still want to use Gibson cloning also the very last fragment of DelA-G has now to be reamplified with novel primers introducing the required overlap to the putative DelOP promoter. The correlating primers can be found in our new vector map.
                                   </p>
                                   </p>

Revision as of 20:06, 2 October 2013

Del Rest. Creating a 32 kbp plasmid.

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