Team:Heidelberg/Delftibactin/DelRest

From 2013.igem.org

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                                   <h1>Week 18</h1>
                                   <h1>Week 18</h1>
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All sequencings carried out last week were positive. As it would be quite costly to sequence the whole 32 kb plasmid, we focused on the ligation site between the different assembly fragments, which are most prone to insertion of errors. All insert fragments sequenced, including the ligation sites between DelA and DelF, DelO-P and DelL, were 100 % correct. However, me detected a mutation within the mRFP cds. As sequencing results for this particular region, were not absolutly reliable (generally week signal in the chromatogramm), sequencing was repeated. FACS analysis of <i> E. coli </i>  bearing the DelRest construnct confirmed that mRFP was not expressed, likely due to the observed mutation. However, as mRFP was only meant to be an expression control for the DelRest genes, we did not see the need of going through the hazzle of removing this mutation - which would actually have been very challenging to do on such a big plasmid. Instead, we started preparing samples for an SDS page will in order to confirm the succesfful expression of the Del genes.
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All sequencings carried out last week were positive. As it would be quite costly to sequence the whole 32 kb plasmid, we focused on the ligation site between the different assembly fragments, which are most prone to insertion of errors. All insert fragments sequenced, including the ligation sites between DelA and DelF, DelO-P and DelL, were 100 % correct. However, me detected a mutation within the mRFP cds (note: we wanted to use mRFP in order to confirm expression from our plasmid). FACS analysis of <i> E. coli </i>  bearing the DelRest construnct showed that mRFP was not expressed, likely due to the corresponding mutation. However, as mRFP was only meant to be an expression control for the DelRest genes we did not start a mutagenesis in order to regain the correct mRFP cds. 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 SDS page we carried out last week, did not display all expected bands clearly, which was likely due to probably due to the very low amount of protein loaded, this SDS page will be repeated within week 19. Nethertheless most resources of the DelRest group will from now on be shifted to the cloning of DelH.
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As the Coomassie we carried out last week did not display all expected bands clearly, which was likely the low amount of protein loaded onto the corresponding SDS page, the SDS page was repeated. Nethertheless most resources of the DelRest group will from now on be shifted to the cloning of DelH.
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Revision as of 21:08, 2 October 2013

Del Rest. Creating a 32 kbp plasmid.

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