Team:Heidelberg/Delftibactin/DelRest

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             <!--Project Description-->
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                         <h1><span style="font-size:180%;color:#FFCC00;">Del Rest.</span><span class="text-muted" style="font-size:120%"> Creating a 32 kbp plasmid.</span></h1>
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                         <h1><span style="font-size:180%;color:#FFCC00;">Del Rest.</span><span class="text-muted" style="font-size:120%"> Creating a 32 kb plasmid.</span></h1>
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This week the project "DelRest" was launched, which aims at creating a single, 32 kb plasmid enabling the expression of most genes from the <i>D. Acidovorans </i> Del cluster, namely DelA-G and DelL-P (note: the 18 kbp gene encoding DelH is cloned onto a seperate plasmid). Due to the shere size and complexity of the DelRest construct, we decided to use Gibson cloning.  
This week the project "DelRest" was launched, which aims at creating a single, 32 kb plasmid enabling the expression of most genes from the <i>D. Acidovorans </i> Del cluster, namely DelA-G and DelL-P (note: the 18 kbp gene encoding DelH is cloned onto a seperate plasmid). Due to the shere size and complexity of the DelRest construct, we decided to use Gibson cloning.  
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This weeks goal was amplify the pSB4K5 backbone from the partsregistry with primers giving the intended overlaps as well as the desired genes from our host organism <i>D. Acidovorans </i>.
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???This weeks goal was amplify the pSB4K5 backbone from the partsregistry with primers giving the intended overlaps as well as the desired genes from our host organism <i>D. Acidovorans </i>.???
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Therefore, Gibson primers for the amplification of the target backbone pSB4K5 were designed, which also introduce a Gibson-overlap to DelA, the first gene present in the Del cluster. Furthermore Gibson primers for amplifying the fragments DelA-G and DelO-P were ordered. The last Gibson primer pair used to amplify DelL consequently carries the required overlap to the beginning of the mRFP reporter present the pSB4K5 insert part BBa_J04450. Check out our vectormap if you are curious about the detailed cloning strategy and primer design.
Therefore, Gibson primers for the amplification of the target backbone pSB4K5 were designed, which also introduce a Gibson-overlap to DelA, the first gene present in the Del cluster. Furthermore Gibson primers for amplifying the fragments DelA-G and DelO-P were ordered. The last Gibson primer pair used to amplify DelL consequently carries the required overlap to the beginning of the mRFP reporter present the pSB4K5 insert part BBa_J04450. Check out our vectormap if you are curious about the detailed cloning strategy and primer design.
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                                   <h1>Week 13</h1>
                                   <h1>Week 13</h1>
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In the previous week, several of the newly ordered primer pairs improved our PCRs for DelO-P and DelF-G. However, results were not convincing enough to use these amplicons for Gibson assembly. Therefore, we spend this week optimizing the PCRs for the abovementioned fragments. In addition we validated the amplicons for
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In the previous week, several of the newly ordered primer pairs improved our PCRs for DelO-P and DelF-G. However, results were not convincing enough to use these amplicons for Gibson assembly. Therefore, we spend this week optimizing the PCRs for the abovementioned fragments. In addition we validated the amplicon of DelG with restriction digest. Validation of the other PCR products did not succeed, mostly due to very low amount of DNA.
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??? insert fragment names here ???
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already successfully optained last week by restriction digest.
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                                   <h1>Week 15</h1>
                                   <h1>Week 15</h1>
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Single read sequencing of the fragments
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Single read sequencing of the PCR amplified fragments DelA-E, DelL as well as the backbone pSB4K5
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???? insert fragments here???
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was carried out by GATC. We blasted the obtained seqeuences against the reference sequence based on the <i>D. acidovorans SPH-1</i> strain available on NCBI. Although our sequence matched to the reference sequence, we found a significant number of missmatches, which was too diverse and high to be simply explained by random mutations introduced by our polymerase during PCR (note: we used a high-fidelity proofreading polymerase suitable for GC-rich templates and long amplicons). We thus hypothesized that the SPH-1 strain based on which our cloning strategy was designed might have a significant number of single-nucleotide polymorphisms in the Del cluster compared to the <i>D. acidovorans</i> DSM-39 strain, which we used as template for all PCRs (note: there is no complete genomic sequence available for the DSM-39 strain on NCBI). We further hypothesized, that this difference in sequence between the DSM-39 strain used as PCR template and the SPH-1 strain based on which our primers were designed could explain our troubles with the PCR amplifications of DelF-G and DelO-P. In consequence, we ordered the SPH-1 strain from the DSMZ in order to obtain a suitable template for our PCRs. This solved all our PCR problems right away and we were able to get all amplicons required for cloning the DelRest construct within this week. Furthermore, we successfully validated our amplicons by restriction digest and sequencing.  
was carried out by GATC. We blasted the obtained seqeuences against the reference sequence based on the <i>D. acidovorans SPH-1</i> strain available on NCBI. Although our sequence matched to the reference sequence, we found a significant number of missmatches, which was too diverse and high to be simply explained by random mutations introduced by our polymerase during PCR (note: we used a high-fidelity proofreading polymerase suitable for GC-rich templates and long amplicons). We thus hypothesized that the SPH-1 strain based on which our cloning strategy was designed might have a significant number of single-nucleotide polymorphisms in the Del cluster compared to the <i>D. acidovorans</i> DSM-39 strain, which we used as template for all PCRs (note: there is no complete genomic sequence available for the DSM-39 strain on NCBI). We further hypothesized, that this difference in sequence between the DSM-39 strain used as PCR template and the SPH-1 strain based on which our primers were designed could explain our troubles with the PCR amplifications of DelF-G and DelO-P. In consequence, we ordered the SPH-1 strain from the DSMZ in order to obtain a suitable template for our PCRs. This solved all our PCR problems right away and we were able to get all amplicons required for cloning the DelRest construct within this week. Furthermore, we successfully validated our amplicons by restriction digest and sequencing.  
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                                   <h1>Week 18</h1>
                                   <h1>Week 18</h1>
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We send one of our DelRest constructs that showed the right restriction pattern in the test digest for sequencing. As it would be quite costly to sequence the whole 32 kb plasmid, we focused on the ligation sites between the different assembly fragments, which are most prone to insertion of errors. Although all insert fragments sequenced, including the ligation sites between DelA and DelF, DelO-P and DelL, were 100 % correct, wee detected a mutation within the mRFP cds (note: we wanted to use mRFP in order to confirm expression from our DelRest plasmid). FACS analysis of <i> E. coli </i>  bearing the DelRest construnct confirmed that mRFP expression was impaired, likely due to the corresponding mutation. However, as mRFP was only meant to be a general expression control on our construct, we did not start correcting out construct by mutagenesis. Instead, we started preparing samples for an SDS page in order to directly proof the expression of the Del genes by Coomassie staining.
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We send one of our DelRest constructs that showed the right restriction pattern in the test digest for sequencing. As it would be quite costly to sequence the whole 32 kb plasmid, we focused on the ligation sites between the different assembly fragments, which are most prone to insertion of errors. Although all insert fragments sequenced, including the ligation sites between DelA and DelF, DelO-P and DelL, were 100 % correct, we detected a mutation within the mRFP cds (note: we wanted to use mRFP in order to confirm expression from our DelRest plasmid). FACS analysis of <i> E. coli </i>  bearing the DelRest construnct confirmed that mRFP expression was impaired, likely due to the corresponding mutation. However, as mRFP was only meant to be a general expression control on our construct, we did not start correcting out construct by mutagenesis. Instead, we started preparing samples for an SDS page in order to directly proof the expression of the Del genes by Coomassie staining.
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                                   <h1>Week 19</h1>
                                   <h1>Week 19</h1>
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As the Coomassie staining we carried out last week did not display all expected bands clearly, likely the low amount of protein loaded onto the corresponding SDS page, the SDS page was repeated.  
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The Coomassie staining we carried out last week did not display all expected bands clearly. This occured most likely due to the low amount of protein loaded onto the corresponding SDS page. Therefore the SDS page was repeated.
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This expression analysis confirmed the results indicated by the previous SDS-page. We were able to show that DelE and DelG are expressed at a detectable level.
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???? Was the SDS Gel repeated  ????
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As we could confirm the successful cloning and functioning of the DelRest expression plasmid named pFSN (for Florian-Sophie-Nils :)) the DelRest subproject was succssfully completed and the personal resources of the DelRest group were shifted to the DelH group as well as the wiki.
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As we could confirm the sccessful cloning and functioning of the DelRest expression plasmid named pFSN (for Florian-Sophie-Nils :)) the DelRest subproject was succssfully completed and the personal resources of the DelRest group were shifted to the DelH group.
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                 </div>
                 <div class="jumbotron weekly">
                 <div class="jumbotron weekly">
-
                     <div class="scrollContent nav navbar" data-spy="scroll" data-target="#navbarExample" data-offset="0">
+
                     <div class="nav navbar" data-spy="scroll" data-target="#navbarExample" data-offset="0">
                        
                        
                       <div class="tab-content">
                       <div class="tab-content">
                             <div class="tab-pane active" id="a17">
                             <div class="tab-pane active" id="a17">
                                 <p style="font-size:12pt; text-align:justify;">
                                 <p style="font-size:12pt; text-align:justify;">
-
                             
+
                                </html>{{:Team:Heidelberg/Templates/Del_week17_overview}}<html>
                                 </p>
                                 </p>
                             </div>
                             </div>
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                 </div>
                 </div>
                 <div class="jumbotron weekly">
                 <div class="jumbotron weekly">
-
                     <div class="scrollContent nav navbar" data-spy="scroll" data-target="#navbarExample" data-offset="0">
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                     <div class="nav navbar" data-spy="scroll" data-target="#navbarExample" data-offset="0">
                        
                        
                       <div class="tab-content">
                       <div class="tab-content">
                             <div class="tab-pane active" id="a18">
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                                 <p style="font-size:12pt; text-align:justify;">
                                 <p style="font-size:12pt; text-align:justify;">
-
                             
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                                  </html>{{:Team:Heidelberg/Templates/Del_week18_overview}}<html>
                                 </p>
                                 </p>
                             </div>
                             </div>
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                 </div>
                 </div>
                 <div class="jumbotron weekly">
                 <div class="jumbotron weekly">
-
                     <div class="scrollContent nav navbar" data-spy="scroll" data-target="#navbarExample" data-offset="0">
+
                     <div class="nav navbar" data-spy="scroll" data-target="#navbarExample" data-offset="0">
                        
                        
                       <div class="tab-content">
                       <div class="tab-content">
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                                 <p style="font-size:12pt; text-align:justify;">
                                 <p style="font-size:12pt; text-align:justify;">
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                                    </html>{{:Team:Heidelberg/Templates/Del_week19_overview}}<html>
                                 </p>
                                 </p>
                             </div>
                             </div>
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               </div>
               </div>
             </div>
             </div>
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          </div>
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          </div>
         </div>
         </div>
     </div>
     </div>
</div>
</div>
</html>
</html>
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{{:Team:Heidelberg/Templates/Footer-Nav}}
{{:Team:Heidelberg/Templates/Footer-DelRest}}
{{:Team:Heidelberg/Templates/Footer-DelRest}}

Latest revision as of 01:37, 29 October 2013

Del Rest. Creating a 32 kb plasmid.

Thanks to

Retrieved from "http://2013.igem.org/Team:Heidelberg/Delftibactin/DelRest"